pre-warm content cache

in parallel!

Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
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@@ -254,10 +312,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -276,6 +334,16 @@ dependencies = [
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+ "smallvec",
+ "target-lexicon",
+]
+
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@@ -438,6 +506,20 @@ dependencies = [
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 dependencies = [
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+ "byteorder-lite",
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- "jpeg-decoder",
+ "image-webp",
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+ "ravif",
+ "rayon",
+ "rgb",
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+dependencies = [
+ "either",
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+dependencies = [
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+dependencies = [
+ "cfg-if",
+ "rayon",
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+
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+ "num-integer",
+ "num-traits",
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@@ -1012,6 +1230,12 @@ dependencies = [
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 ]
 
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+
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 dependencies = [
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+ "profiling-procmacros",
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+]
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+ "syn",
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 [[package]]
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 ]
 
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+
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 ]
 
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+ "arg_enum_proc_macro",
+ "arrayvec",
+ "av1-grain",
+ "bitstream-io",
+ "built",
+ "cfg-if",
+ "interpolate_name",
+ "itertools",
+ "libc",
+ "libfuzzer-sys",
+ "log",
+ "maybe-rayon",
+ "new_debug_unreachable",
+ "noop_proc_macro",
+ "num-derive",
+ "num-traits",
+ "once_cell",
+ "paste",
+ "profiling",
+ "rand",
+ "rand_chacha",
+ "simd_helpers",
+ "system-deps",
+ "thiserror",
+ "v_frame",
+ "wasm-bindgen",
+]
+
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+dependencies = [
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+ "imgref",
+ "loop9",
+ "quick-error",
+ "rav1e",
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+
 [[package]]
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@@ -1373,6 +1667,15 @@ version = "0.3.7"
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 checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
 
+[[package]]
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+checksum = "95890f873bec569a0362c235787f3aca6e1e887302ba4840839bcc6459c42da6"
+dependencies = [
+ "quote",
+]
+
 [[package]]
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 version = "1.13.2"
@@ -1427,6 +1730,25 @@ version = "1.0.1"
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 checksum = "a7065abeca94b6a8a577f9bd45aa0867a2238b74e8eb67cf10d492bc39351394"
 
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e535eb8dded36d55ec13eddacd30dec501792ff23a0b1682c38601b8cf2349"
+dependencies = [
+ "cfg-expr",
+ "heck",
+ "pkg-config",
+ "toml",
+ "version-compare",
+]
+
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+
 [[package]]
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 version = "1.4.1"
@@ -1512,6 +1834,18 @@ dependencies = [
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 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac2caab0bf757388c6c0ae23b3293fdb463fee59434529014f85e3263b995c28"
+dependencies = [
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_edit 0.22.16",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.6.6"
@@ -1531,7 +1865,20 @@ dependencies = [
  "serde",
  "serde_spanned",
  "toml_datetime",
- "winnow",
+ "winnow 0.5.40",
+]
+
+[[package]]
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+version = "0.22.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "278f3d518e152219c994ce877758516bca5e118eaed6996192a774fb9fbf0788"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "winnow 0.6.20",
 ]
 
 [[package]]
@@ -1556,20 +1903,6 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
 
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 name = "tower-service"
 version = "0.3.2"
@@ -1608,6 +1941,7 @@ dependencies = [
  "clap",
  "codespan-reporting",
  "copy_dir",
+ "dashmap",
  "env_logger",
  "git2",
  "handlebars",
@@ -1616,14 +1950,13 @@ dependencies = [
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  "jotdown",
  "log",
- "pulldown-cmark",
  "rand",
+ "rayon",
  "regex",
  "serde",
  "serde_json",
  "tokio",
- "toml_edit",
+ "toml_edit 0.19.15",
- "tower-livereload",
  "treehouse-format",
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@@ -1660,15 +1993,6 @@ dependencies = [
  "web-time",
 ]
 
-[[package]]
-name = "unicase"
-version = "2.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7d2d4dafb69621809a81864c9c1b864479e1235c0dd4e199924b9742439ed89"
-dependencies = [
- "version_check",
-]
-
 [[package]]
 name = "unicode-bidi"
 version = "0.3.15"
@@ -1713,12 +2037,29 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
+[[package]]
+name = "v_frame"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d6f32aaa24bacd11e488aa9ba66369c7cd514885742c9fe08cfe85884db3e92b"
+dependencies = [
+ "aligned-vec",
+ "num-traits",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "version-compare"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852e951cb7832cb45cb1169900d19760cfa39b82bc0ea9c0e5a14ae88411c98b"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
@@ -1977,6 +2318,21 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winnow"
+version = "0.6.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36c1fec1a2bb5866f07c25f68c26e565c4c200aebb96d7e55710c19d3e8ac49b"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "zune-core"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a"
+
 [[package]]
 name = "zune-inflate"
 version = "0.2.54"
@@ -1985,3 +2341,12 @@ checksum = "73ab332fe2f6680068f3582b16a24f90ad7096d5d39b974d1c0aff0125116f02"
 dependencies = [
  "simd-adler32",
 ]
+
+[[package]]
+name = "zune-jpeg"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16099418600b4d8f028622f73ff6e3deaabdff330fb9a2a131dea781ee8b0768"
+dependencies = [
+ "zune-core",
+]

content/_treehouse/404.tree

@@ -1,8 +1,5 @@
 %% title = "404"
 
-% id = "404"
-- # 404
-
 % id = "01HMF8KQ997F1ZTEGDNAE2S6F1"
 - seems like the page you're looking for isn't here.
 

content/programming/opinions.tree

@@ -6,7 +6,7 @@
 <style>
     @font-face {
         font-family: "Determination Sans";
-        src: url('/static/font/DTM-Sans.otf?cache=b3-4fe96c14');
+        src: url('/static/font/DTM-Sans.otf?v=b3-4fe96c14');
     }
 
     .undertale-save-box {

content/treehouse/vfs.tree

@@ -0,0 +1,17 @@
+%% title = "treehouse virtual file system design"
+
+- notes on the design; this is not an actual listing of the virtual file system
+
+- `content` - `GitDir(".", "content")`
+
+    - `GitDir` is a special filesystem which makes all files have subpaths with commit data sourced from git.
+    their entries are ordered by how new/old a commit is
+
+        - `inner/<commit>` - contains the file content and a revision info fork
+
+        - `inner/latest` - same but for the latest revision, if applicable.
+        this may be the working tree
+
+- `template` - `PhysicalDir("template")`
+
+- `static` - `PhysicalDir("static")`

crates/treehouse-format/src/pull.rs

@@ -46,7 +46,7 @@ enum AllowCodeBlocks {
     Yes,
 }
 
-impl<'a> Parser<'a> {
+impl Parser<'_> {
     fn current(&self) -> Option<char> {
         self.input[self.position..].chars().next()
     }

crates/treehouse/Cargo.toml

@@ -15,24 +15,22 @@ chrono = "0.4.35"
 clap = { version = "4.3.22", features = ["derive"] }
 codespan-reporting = "0.11.1"
 copy_dir = "0.1.3"
+dashmap = "6.1.0"
 env_logger = "0.10.0"
 git2 = { version = "0.19.0", default-features = false, features = ["vendored-libgit2"] }
 handlebars = "4.3.7"
 http-body = "1.0.0"
-image = "0.24.8"
+image = "0.25.5"
 indexmap = { version = "2.2.6", features = ["serde"] }
 jotdown = { version = "0.4.1", default-features = false }
 log = { workspace = true }
 rand = "0.8.5"
+rayon = "1.10.0"
 regex = "1.10.3"
 serde = { version = "1.0.183", features = ["derive"] }
 serde_json = "1.0.105"
 tokio = { version = "1.32.0", features = ["full"] }
 toml_edit = { version = "0.19.14", features = ["serde"] }
-tower-livereload = "0.9.2"
 walkdir = "2.3.3"
 ulid = "1.0.0"
 url = "2.5.0"
-
-# TODO djot: To remove once migration to Djot is complete.
-pulldown-cmark = { version = "0.9.3", default-features = false }

crates/treehouse/src/cli.rs

@@ -2,10 +2,10 @@ pub mod fix;
 pub mod serve;
 pub mod wc;
 
-use std::path::{Path, PathBuf};
-
 use clap::{Args, Parser, Subcommand};
 
+use crate::vfs::VPathBuf;
+
 #[derive(Parser)]
 pub struct ProgramArgs {
     #[clap(subcommand)]
@@ -14,9 +14,6 @@ pub struct ProgramArgs {
 
 #[derive(Subcommand)]
 pub enum Command {
-    /// Regenerate the website.
-    Generate(#[clap(flatten)] GenerateArgs),
-
     /// Populate missing metadata in blocks.
     Fix(#[clap(flatten)] FixArgs),
 
@@ -44,20 +41,13 @@ pub enum Command {
 }
 
 #[derive(Args)]
-pub struct GenerateArgs {
+pub struct GenerateArgs {}
-    /// Only use commits as sources. This will cause the latest revision to be taken from the
-    /// Git history instead of the working tree.
-    ///
-    /// Recommended for deployment.
-    #[clap(long)]
-    pub commits_only: bool,
-}
 
 #[derive(Args)]
 pub struct FixArgs {
     /// Which file to fix. The fixed file will be printed into stdout so that you have a chance to
     /// see the changes.
-    pub file: PathBuf,
+    pub file: VPathBuf,
 
     /// If you're happy with the suggested changes, specifying this will apply them to the file
     /// (overwrite it in place.)
@@ -66,7 +56,7 @@ pub struct FixArgs {
 
     /// Write the previous version back to the specified path.
     #[clap(long)]
-    pub backup: Option<PathBuf>,
+    pub backup: Option<VPathBuf>,
 }
 
 #[derive(Args)]
@@ -88,17 +78,5 @@ pub struct ServeArgs {
 pub struct WcArgs {
     /// A list of paths to report the word counts of.
     /// If no paths are provided, the entire tree is word-counted.
-    pub paths: Vec<PathBuf>,
+    pub paths: Vec<VPathBuf>,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub struct Paths<'a> {
-    pub target_dir: &'a Path,
-    pub template_target_dir: &'a Path,
-
-    pub static_dir: &'a Path,
-    pub template_dir: &'a Path,
-    pub content_dir: &'a Path,
-
-    pub config_file: &'a Path,
 }

crates/treehouse/src/cli/fix.rs

@@ -1,16 +1,17 @@
-use std::{ffi::OsStr, ops::Range};
+use std::ops::{ControlFlow, Range};
 
-use anyhow::Context;
+use anyhow::{anyhow, Context};
 use codespan_reporting::diagnostic::Diagnostic;
+use log::{error, info};
 use treehouse_format::ast::Branch;
-use walkdir::WalkDir;
 
 use crate::{
     parse::{self, parse_toml_with_diagnostics, parse_tree_with_diagnostics},
     state::{report_diagnostics, FileId, Source, Treehouse},
+    vfs::{self, Dir, Edit, VPath},
 };
 
-use super::{FixAllArgs, FixArgs, Paths};
+use super::{FixAllArgs, FixArgs};
 
 struct Fix {
     range: Range<usize>,
@@ -132,68 +133,102 @@ pub fn fix_file(
         })
 }
 
-pub fn fix_file_cli(fix_args: FixArgs) -> anyhow::Result<()> {
+pub fn fix_file_cli(fix_args: FixArgs, root: &dyn Dir) -> anyhow::Result<Edit> {
-    let utf8_filename = fix_args.file.to_string_lossy().into_owned();
+    let file = if &*fix_args.file == VPath::new("-") {
-    let file = if utf8_filename == "-" {
         std::io::read_to_string(std::io::stdin().lock()).context("cannot read file from stdin")?
     } else {
-        std::fs::read_to_string(&fix_args.file).context("cannot read file to fix")?
+        String::from_utf8(
+            root.content(&fix_args.file)
+                .ok_or_else(|| anyhow!("cannot read file to fix"))?,
+        )
+        .context("input file has invalid UTF-8")?
     };
 
     let mut treehouse = Treehouse::new();
     let mut diagnostics = vec![];
-    let file_id = treehouse.add_file(utf8_filename, Source::Other(file));
+    let file_id = treehouse.add_file(fix_args.file.as_str().to_owned(), Source::Other(file));
+    let edit_path = root.edit_path(&fix_args.file).ok_or_else(|| {
+        anyhow!(
+            "{} is not an editable file (perhaps it is not in a persistent path?)",
+            fix_args.file
+        )
+    })?;
 
+    Ok(
         if let Ok(fixed) = fix_file(&mut treehouse, &mut diagnostics, file_id) {
             if fix_args.apply {
                 // Try to write the backup first. If writing that fails, bail out without overwriting
                 // the source file.
                 if let Some(backup_path) = fix_args.backup {
-                std::fs::write(backup_path, treehouse.source(file_id).input())
+                    let backup_edit_path = root.edit_path(&backup_path).ok_or_else(|| {
-                    .context("cannot write backup; original file will not be overwritten")?;
+                        anyhow!("backup file {backup_path} is not an editable file")
+                    })?;
+                    Edit::Seq(vec![
+                        Edit::Write(
+                            backup_edit_path,
+                            treehouse.source(file_id).input().to_owned(),
+                        ),
+                        Edit::Write(edit_path, fixed),
+                    ])
+                } else {
+                    Edit::Write(edit_path, fixed)
                 }
-            std::fs::write(&fix_args.file, fixed).context("cannot overwrite original file")?;
             } else {
                 println!("{fixed}");
+                Edit::NoOp
             }
         } else {
             report_diagnostics(&treehouse.files, &diagnostics)?;
+            Edit::NoOp
+        },
+    )
 }
 
-    Ok(())
+pub fn fix_all_cli(fix_all_args: FixAllArgs, dir: &dyn Dir) -> anyhow::Result<Edit> {
-}
+    let mut edits = vec![];
 
-pub fn fix_all_cli(fix_all_args: FixAllArgs, paths: &Paths<'_>) -> anyhow::Result<()> {
+    fn fix_one(dir: &dyn Dir, path: &VPath) -> anyhow::Result<Edit> {
-    for entry in WalkDir::new(paths.content_dir) {
+        if path.extension() == Some("tree") {
-        let entry = entry?;
+            let Some(content) = dir.content(path) else {
-        if entry.file_type().is_file() && entry.path().extension() == Some(OsStr::new("tree")) {
+                return Ok(Edit::NoOp);
-            let file = std::fs::read_to_string(entry.path())
+            };
-                .with_context(|| format!("cannot read file to fix: {:?}", entry.path()))?;
+            let content = String::from_utf8(content).context("file is not valid UTF-8")?;
-            let utf8_filename = entry.path().to_string_lossy();
 
             let mut treehouse = Treehouse::new();
             let mut diagnostics = vec![];
-            let file_id = treehouse.add_file(utf8_filename.into_owned(), Source::Other(file));
+            let file_id = treehouse.add_file(path.as_str().to_string(), Source::Other(content));
+            let edit_path = dir.edit_path(path).context("path is not editable")?;
 
             if let Ok(fixed) = fix_file(&mut treehouse, &mut diagnostics, file_id) {
                 if fixed != treehouse.source(file_id).input() {
-                    if fix_all_args.apply {
+                    return Ok(Edit::Write(edit_path, fixed));
-                        println!("fixing: {:?}", entry.path());
-                        std::fs::write(entry.path(), fixed).with_context(|| {
-                            format!("cannot overwrite original file: {:?}", entry.path())
-                        })?;
-                    } else {
-                        println!("will fix: {:?}", entry.path());
-                    }
                 }
             } else {
                 report_diagnostics(&treehouse.files, &diagnostics)?;
             }
         }
-    }
+
-    if !fix_all_args.apply {
+        Ok(Edit::NoOp)
-        println!("run with `--apply` to apply changes");
     }
 
-    Ok(())
+    info!("gathering edits");
+    vfs::walk_dir_rec(dir, VPath::ROOT, &mut |path| {
+        match fix_one(dir, path) {
+            Ok(Edit::NoOp) => (),
+            Ok(edit) => edits.push(edit),
+            Err(err) => error!("cannot fix {path}: {err:?}"),
+        }
+
+        ControlFlow::Continue(())
+    });
+
+    // NOTE: This number may be higher than you expect, because NoOp edits also count!
+    info!("{} edits to apply", edits.len());
+
+    if !fix_all_args.apply {
+        info!("dry run; add `--apply` to apply changes");
+        Ok(Edit::Dry(Box::new(Edit::All(edits))))
+    } else {
+        Ok(Edit::All(edits))
+    }
 }

crates/treehouse/src/cli/serve.rs

@@ -1,131 +1,79 @@
 #[cfg(debug_assertions)]
 mod live_reload;
 
-use std::{net::Ipv4Addr, path::PathBuf, sync::Arc};
+use std::fmt::Write;
+use std::{net::Ipv4Addr, sync::Arc};
 
-use anyhow::Context;
 use axum::{
     extract::{Path, Query, RawQuery, State},
     http::{
-        header::{CACHE_CONTROL, CONTENT_TYPE, LOCATION},
+        header::{CACHE_CONTROL, CONTENT_TYPE},
         HeaderValue, StatusCode,
     },
     response::{Html, IntoResponse, Response},
     routing::get,
     Router,
 };
-use log::{error, info};
+use log::info;
-use pulldown_cmark::escape::escape_html;
 use serde::Deserialize;
 use tokio::net::TcpListener;
 
-use crate::{
+use crate::generate::Sources;
-    config::Config,
+use crate::vfs::asynch::AsyncDir;
-    state::{Source, Treehouse},
+use crate::vfs::VPath;
-};
+use crate::{html::EscapeHtml, state::Source};
 
-use super::Paths;
+mod system {
+    use crate::vfs::VPath;
 
-struct SystemPages {
+    pub const INDEX: &VPath = VPath::new_const("index");
-    index: String,
+    pub const FOUR_OH_FOUR: &VPath = VPath::new_const("_treehouse/404");
-    four_oh_four: String,
+    pub const B_DOCS: &VPath = VPath::new_const("_treehouse/b");
-    b_docs: String,
-    sandbox: String,
-
-    navmap: String,
 }
 
 struct Server {
-    config: Config,
+    sources: Arc<Sources>,
-    treehouse: Treehouse,
+    target: AsyncDir,
-    target_dir: PathBuf,
-    system_pages: SystemPages,
 }
 
-pub async fn serve(
+pub async fn serve(sources: Arc<Sources>, target: AsyncDir, port: u16) -> anyhow::Result<()> {
-    config: Config,
-    treehouse: Treehouse,
-    paths: &Paths<'_>,
-    port: u16,
-) -> anyhow::Result<()> {
     let app = Router::new()
-        .route("/", get(index))
+        .route("/", get(index)) // needed explicitly because * does not match empty paths
-        .route("/*page", get(page))
+        .route("/*path", get(vfs_entry))
         .route("/b", get(branch))
-        .route("/navmap.js", get(navmap))
-        .route("/sandbox", get(sandbox))
-        .route("/static/*file", get(static_file))
         .fallback(get(four_oh_four))
-        .with_state(Arc::new(Server {
+        .with_state(Arc::new(Server { sources, target }));
-            config,
-            treehouse,
-            target_dir: paths.target_dir.to_owned(),
-            system_pages: SystemPages {
-                index: std::fs::read_to_string(paths.target_dir.join("index.html"))
-                    .context("cannot read index page")?,
-                four_oh_four: std::fs::read_to_string(paths.target_dir.join("_treehouse/404.html"))
-                    .context("cannot read 404 page")?,
-                b_docs: std::fs::read_to_string(paths.target_dir.join("_treehouse/b.html"))
-                    .context("cannot read /b documentation page")?,
-                sandbox: std::fs::read_to_string(paths.target_dir.join("static/html/sandbox.html"))
-                    .context("cannot read sandbox page")?,
-                navmap: std::fs::read_to_string(paths.target_dir.join("navmap.js"))
-                    .context("cannot read navigation map")?,
-            },
-        }));
 
     #[cfg(debug_assertions)]
-    let app = live_reload::live_reload(app);
+    let app = app.nest("/dev/live-reload", live_reload::router());
 
     info!("serving on port {port}");
     let listener = TcpListener::bind((Ipv4Addr::from([0u8, 0, 0, 0]), port)).await?;
     Ok(axum::serve(listener, app).await?)
 }
 
-fn get_content_type(path: &str) -> Option<&'static str> {
+fn get_content_type(extension: &str) -> Option<&'static str> {
-    match () {
+    match extension {
-        _ if path.ends_with(".html") => Some("text/html"),
+        "html" => Some("text/html"),
-        _ if path.ends_with(".js") => Some("text/javascript"),
+        "js" => Some("text/javascript"),
-        _ if path.ends_with(".woff2") => Some("font/woff2"),
+        "woff" => Some("font/woff2"),
-        _ if path.ends_with(".svg") => Some("image/svg+xml"),
+        "svg" => Some("image/svg+xml"),
         _ => None,
     }
 }
 
-async fn index(State(state): State<Arc<Server>>) -> Response {
-    Html(state.system_pages.index.clone()).into_response()
-}
-
-async fn navmap(State(state): State<Arc<Server>>) -> Response {
-    let mut response = state.system_pages.navmap.clone().into_response();
-    response
-        .headers_mut()
-        .insert(CONTENT_TYPE, HeaderValue::from_static("text/javascript"));
-    response
-}
-
-async fn four_oh_four(State(state): State<Arc<Server>>) -> Response {
-    (
-        StatusCode::NOT_FOUND,
-        Html(state.system_pages.four_oh_four.clone()),
-    )
-        .into_response()
-}
-
 #[derive(Deserialize)]
-struct StaticFileQuery {
+struct VfsQuery {
-    cache: Option<String>,
+    #[serde(rename = "v")]
+    content_version: Option<String>,
 }
 
-async fn static_file(
+async fn get_static_file(path: &str, query: &VfsQuery, state: &Server) -> Option<Response> {
-    Path(path): Path<String>,
+    let vpath = VPath::try_new(path).ok()?;
-    Query(query): Query<StaticFileQuery>,
+    let content = state.target.content(vpath).await?;
-    State(state): State<Arc<Server>>,
+    let mut response = content.into_response();
-) -> Response {
-    if let Ok(file) = tokio::fs::read(state.target_dir.join("static").join(&path)).await {
-        let mut response = file.into_response();
 
-        if let Some(content_type) = get_content_type(&path) {
+    if let Some(content_type) = vpath.extension().and_then(get_content_type) {
         response
             .headers_mut()
             .insert(CONTENT_TYPE, HeaderValue::from_static(content_type));
@@ -133,76 +81,80 @@ async fn static_file(
         response.headers_mut().remove(CONTENT_TYPE);
     }
 
-        if query.cache.is_some() {
+    if query.content_version.is_some() {
         response.headers_mut().insert(
             CACHE_CONTROL,
             HeaderValue::from_static("public, max-age=31536000, immutable"),
         );
     }
 
+    Some(response)
+}
+
+async fn vfs_entry(
+    Path(path): Path<String>,
+    Query(query): Query<VfsQuery>,
+    State(state): State<Arc<Server>>,
+) -> Response {
+    if let Some(response) = get_static_file(&path, &query, &state).await {
         response
     } else {
         four_oh_four(State(state)).await
     }
 }
 
-async fn page(Path(path): Path<String>, State(state): State<Arc<Server>>) -> Response {
+async fn system_page(target: &AsyncDir, path: &VPath, status_code: StatusCode) -> Response {
-    let bare_path = path.strip_suffix(".html").unwrap_or(&path);
+    if let Some(content) = target.content(path).await {
-    if let Some(redirected_path) = state.config.redirects.page.get(bare_path) {
+        (status_code, Html(content)).into_response()
-        return (
+    } else {
-            StatusCode::MOVED_PERMANENTLY,
+        (
-            [(LOCATION, format!("{}/{redirected_path}", state.config.site))],
+            StatusCode::INTERNAL_SERVER_ERROR,
+            format!("500 Internal Server Error: system page {path} is not available"),
         )
-            .into_response();
+            .into_response()
-    }
-
-    let html_path = format!("{bare_path}.html");
-    if let Ok(file) = tokio::fs::read(state.target_dir.join(&*html_path)).await {
-        ([(CONTENT_TYPE, "text/html")], file).into_response()
-    } else {
-        four_oh_four(State(state)).await
     }
 }
 
-async fn sandbox(State(state): State<Arc<Server>>) -> Response {
+async fn index(State(state): State<Arc<Server>>) -> Response {
-    // Small hack to prevent the LiveReloadLayer from injecting itself into the sandbox.
+    system_page(&state.target, system::INDEX, StatusCode::OK).await
-    // The sandbox is always nested under a different page, so there's no need to do that.
-    let mut response = Html(state.system_pages.sandbox.clone()).into_response();
-    #[cfg(debug_assertions)]
-    {
-        response
-            .extensions_mut()
-            .insert(live_reload::DisableLiveReload);
-    }
-    // Debounce requests a bit. There's a tendency to have very many sandboxes on a page, and
-    // loading this page as many times as there are sandboxes doesn't seem like the best way to do
-    // things.
-    response
-        .headers_mut()
-        .insert(CACHE_CONTROL, HeaderValue::from_static("max-age=10"));
-    response
 }
 
-async fn branch(RawQuery(named_id): RawQuery, State(state): State<Arc<Server>>) -> Html<String> {
+async fn four_oh_four(State(state): State<Arc<Server>>) -> Response {
+    system_page(&state.target, system::FOUR_OH_FOUR, StatusCode::NOT_FOUND).await
+}
+
+async fn branch(RawQuery(named_id): RawQuery, State(state): State<Arc<Server>>) -> Response {
     if let Some(named_id) = named_id {
         let branch_id = state
+            .sources
             .treehouse
             .branches_by_named_id
             .get(&named_id)
             .copied()
-            .or_else(|| state.treehouse.branch_redirects.get(&named_id).copied());
+            .or_else(|| {
+                state
+                    .sources
+                    .treehouse
+                    .branch_redirects
+                    .get(&named_id)
+                    .copied()
+            });
         if let Some(branch_id) = branch_id {
-            let branch = state.treehouse.tree.branch(branch_id);
+            let branch = state.sources.treehouse.tree.branch(branch_id);
             if let Source::Tree {
                 input, target_path, ..
-            } = state.treehouse.source(branch.file_id)
+            } = state.sources.treehouse.source(branch.file_id)
             {
-                match std::fs::read_to_string(target_path) {
+                if let Some(content) = state
-                    Ok(content) => {
+                    .target
-                        let branch_markdown_content = input[branch.content.clone()].trim();
+                    .content(target_path)
+                    .await
+                    .and_then(|s| String::from_utf8(s).ok())
+                {
+                    let branch_markup = input[branch.content.clone()].trim();
                     let mut per_page_metadata =
                         String::from("<meta property=\"og:description\" content=\"");
-                        escape_html(&mut per_page_metadata, branch_markdown_content).unwrap();
+                    write!(per_page_metadata, "{}", EscapeHtml(branch_markup)).unwrap();
                     per_page_metadata.push_str("\">");
 
                     const PER_PAGE_METADATA_REPLACEMENT_STRING: &str = "<!-- treehouse-ca37057a-cff5-45b3-8415-3b02dbf6c799-per-branch-metadata -->";
@@ -211,17 +163,20 @@ async fn branch(RawQuery(named_id): RawQuery, State(state): State<Arc<Server>>)
                         &per_page_metadata,
                         // Replace one under the assumption that it appears in all pages.
                         1,
-                        ));
+                    ))
-                    }
+                    .into_response();
-                    Err(e) => {
+                } else {
-                        error!("error while reading file {target_path:?}: {e:?}");
+                    return (
-                    }
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        format!("500 Internal Server Error: branch metadata points to entry {target_path} which does not have readable content")
+                    )
+                        .into_response();
                 }
             }
         }
 
-        Html(state.system_pages.four_oh_four.clone())
+        system_page(&state.target, system::FOUR_OH_FOUR, StatusCode::NOT_FOUND).await
     } else {
-        Html(state.system_pages.b_docs.clone())
+        system_page(&state.target, system::B_DOCS, StatusCode::OK).await
     }
 }

crates/treehouse/src/cli/serve/live_reload.rs

@@ -1,21 +1,28 @@
-use axum::{
+use std::time::Duration;
-    http::{header::CONTENT_TYPE, Response},
-    Router,
-};
 
-#[derive(Debug, Clone, Copy)]
+use axum::{routing::get, Router};
-pub struct DisableLiveReload;
+use tokio::time::sleep;
 
-pub fn live_reload(router: Router) -> Router {
+pub fn router<S>() -> Router<S> {
-    router.layer(tower_livereload::LiveReloadLayer::new().response_predicate(
+    let router = Router::new().route("/back-up", get(back_up));
-        |response: &Response<_>| {
+
-            let is_html = response
+    // The endpoint for immediate reload is only enabled on debug builds.
-                .headers()
+    // Release builds use the exponential backoff system that detects is the WebSocket is closed.
-                .get(CONTENT_TYPE)
+    #[cfg(debug_assertions)]
-                .and_then(|v| v.to_str().ok())
+    let router = router.route("/stall", get(stall));
-                .is_some_and(|v| v.starts_with("text/html"));
+
-            let is_disabled = response.extensions().get::<DisableLiveReload>().is_some();
+    router.with_state(())
-            is_html && !is_disabled
+}
-        },
+
-    ))
+#[cfg(debug_assertions)]
+async fn stall() -> String {
+    loop {
+        // Sleep for a day, I guess. Just to uphold the connection forever without really using any
+        // significant resources.
+        sleep(Duration::from_secs(60 * 60 * 24)).await;
+    }
+}
+
+async fn back_up() -> String {
+    "".into()
 }

crates/treehouse/src/cli/wc.rs

@@ -1,12 +1,11 @@
-use std::{ffi::OsStr, path::Path};
+use std::ops::ControlFlow;
 
-use anyhow::Context;
 use treehouse_format::ast::{Branch, Roots};
-use walkdir::WalkDir;
 
 use crate::{
     parse::parse_tree_with_diagnostics,
     state::{report_diagnostics, Source, Treehouse},
+    vfs::{self, Dir, VPath},
 };
 
 use super::WcArgs;
@@ -29,14 +28,14 @@ fn wc_roots(source: &str, roots: &Roots) -> usize {
         .sum()
 }
 
-pub fn wc_cli(content_dir: &Path, mut wc_args: WcArgs) -> anyhow::Result<()> {
+pub fn wc_cli(content_dir: &dyn Dir, mut wc_args: WcArgs) -> anyhow::Result<()> {
     if wc_args.paths.is_empty() {
-        for entry in WalkDir::new(content_dir) {
+        vfs::walk_dir_rec(content_dir, VPath::ROOT, &mut |path| {
-            let entry = entry?;
+            if path.extension() == Some("tree") {
-            if entry.file_type().is_file() && entry.path().extension() == Some(OsStr::new("tree")) {
+                wc_args.paths.push(path.to_owned());
-                wc_args.paths.push(entry.into_path());
-            }
             }
+            ControlFlow::Continue(())
+        });
     }
 
     let mut treehouse = Treehouse::new();
@@ -44,15 +43,11 @@ pub fn wc_cli(content_dir: &Path, mut wc_args: WcArgs) -> anyhow::Result<()> {
     let mut total = 0;
 
     for path in &wc_args.paths {
-        let file = std::fs::read_to_string(path)
+        if let Some(content) = content_dir
-            .with_context(|| format!("cannot read file to word count: {path:?}"))?;
+            .content(path)
-        let path_without_ext = path.with_extension("");
+            .and_then(|b| String::from_utf8(b).ok())
-        let utf8_filename = path_without_ext
+        {
-            .strip_prefix(content_dir)
+            let file_id = treehouse.add_file(path.to_string(), Source::Other(content));
-            .expect("paths should be rooted within the content directory")
-            .to_string_lossy();
-
-        let file_id = treehouse.add_file(utf8_filename.into_owned(), Source::Other(file));
             match parse_tree_with_diagnostics(&mut treehouse, file_id) {
                 Ok(parsed) => {
                     let source = treehouse.source(file_id);
@@ -65,6 +60,7 @@ pub fn wc_cli(content_dir: &Path, mut wc_args: WcArgs) -> anyhow::Result<()> {
                 }
             }
         }
+    }
 
     println!("{total:>8} total");
 

crates/treehouse/src/config.rs

@@ -1,10 +1,8 @@
-use std::{collections::HashMap, ffi::OsStr, fs::File, io::BufReader, path::Path};
+use std::{collections::HashMap, ops::ControlFlow};
 
-use anyhow::Context;
+use anyhow::{anyhow, Context};
-use image::ImageError;
+use log::{debug, error};
-use log::{debug, warn};
 use serde::{Deserialize, Serialize};
-use walkdir::WalkDir;
 
 use crate::{
     html::highlight::{
@@ -12,7 +10,7 @@ use crate::{
         Syntax,
     },
     import_map::ImportRoot,
-    static_urls::StaticUrls,
+    vfs::{self, Dir, ImageSize, VPath, VPathBuf},
 };
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
@@ -22,10 +20,6 @@ pub struct Config {
     /// preferred way of setting this in production, so as not to clobber treehouse.toml.)
     pub site: String,
 
-    /// Which markup to use when generating trees.
-    /// TODO djot: Remove this once we transition to Djot fully.
-    pub markup: Markup,
-
     /// This is used to generate a link in the footer that links to the page's source commit.
     /// The final URL is `{commit_base_url}/{commit}/content/{tree_path}.tree`.
     pub commit_base_url: String,
@@ -59,17 +53,17 @@ pub struct Config {
     /// How the treehouse should be built.
     pub build: Build,
 
-    /// Overrides for emoji filenames. Useful for setting up aliases.
+    /// Overrides for emoji names. Useful for setting up aliases.
     ///
-    /// On top of this, emojis are autodiscovered by walking the `static/emoji` directory.
+    /// Paths are anchored within `static/emoji` and must not contain parent directories.
     #[serde(default)]
-    pub emoji: HashMap<String, String>,
+    pub emoji: HashMap<String, VPathBuf>,
 
     /// Overrides for pic filenames. Useful for setting up aliases.
     ///
     /// On top of this, pics are autodiscovered by walking the `static/pic` directory.
     /// Only the part before the first dash is treated as the pic's id.
-    pub pics: HashMap<String, String>,
+    pub pics: HashMap<String, VPathBuf>,
 
     /// Syntax definitions.
     ///
@@ -105,72 +99,39 @@ pub enum Markup {
 }
 
 impl Config {
-    pub fn load(path: &Path) -> anyhow::Result<Self> {
+    pub fn autopopulate_emoji(&mut self, dir: &dyn Dir) -> anyhow::Result<()> {
-        let string = std::fs::read_to_string(path).context("cannot read config file")?;
+        vfs::walk_dir_rec(dir, VPath::ROOT, &mut |path| {
-        toml_edit::de::from_str(&string).context("error in config file")
+            if path.extension().is_some_and(is_image_file) {
+                if let Some(emoji_name) = path.file_stem() {
+                    if !self.emoji.contains_key(emoji_name) {
+                        self.emoji.insert(emoji_name.to_owned(), path.to_owned());
+                    }
+                }
             }
 
-    fn is_emoji_file(path: &Path) -> bool {
+            ControlFlow::Continue(())
-        path.extension() == Some(OsStr::new("png")) || path.extension() == Some(OsStr::new("svg"))
+        });
-    }
 
-    pub fn autopopulate_emoji(&mut self, dir: &Path) -> anyhow::Result<()> {
-        for file in WalkDir::new(dir) {
-            let entry = file?;
-            if entry.file_type().is_file() && Self::is_emoji_file(entry.path()) {
-                if let Some(emoji_name) = entry.path().file_stem() {
-                    let emoji_name = emoji_name.to_string_lossy();
-                    if !self.emoji.contains_key(emoji_name.as_ref()) {
-                        self.emoji.insert(
-                            emoji_name.into_owned(),
-                            entry
-                                .path()
-                                .strip_prefix(dir)
-                                .unwrap_or(entry.path())
-                                .to_string_lossy()
-                                .into_owned(),
-                        );
-                    }
-                }
-            }
-        }
         Ok(())
     }
 
-    fn is_pic_file(path: &Path) -> bool {
+    pub fn autopopulate_pics(&mut self, dir: &dyn Dir) -> anyhow::Result<()> {
-        path.extension() == Some(OsStr::new("png"))
+        vfs::walk_dir_rec(dir, VPath::ROOT, &mut |path| {
-            || path.extension() == Some(OsStr::new("svg"))
+            if path.extension().is_some_and(is_image_file) {
-            || path.extension() == Some(OsStr::new("jpg"))
+                if let Some(pic_name) = path.file_stem() {
-            || path.extension() == Some(OsStr::new("jpeg"))
-            || path.extension() == Some(OsStr::new("webp"))
-    }
-
-    pub fn autopopulate_pics(&mut self, dir: &Path) -> anyhow::Result<()> {
-        for file in WalkDir::new(dir) {
-            let entry = file?;
-            if entry.file_type().is_file() && Self::is_pic_file(entry.path()) {
-                if let Some(pic_name) = entry.path().file_stem() {
-                    let pic_name = pic_name.to_string_lossy();
-
                     let pic_id = pic_name
                         .split_once('-')
                         .map(|(before_dash, _after_dash)| before_dash)
-                        .unwrap_or(&pic_name);
+                        .unwrap_or(pic_name);
 
                     if !self.pics.contains_key(pic_id) {
-                        self.pics.insert(
+                        self.pics.insert(pic_id.to_owned(), path.to_owned());
-                            pic_id.to_owned(),
-                            entry
-                                .path()
-                                .strip_prefix(dir)
-                                .unwrap_or(entry.path())
-                                .to_string_lossy()
-                                .into_owned(),
-                        );
-                    }
                     }
                 }
             }
+
+            ControlFlow::Continue(())
+        });
         Ok(())
     }
 
@@ -178,79 +139,56 @@ impl Config {
         format!("{}/{}", self.site, page)
     }
 
-    pub fn pic_url(&self, id: &str) -> String {
+    pub fn pic_url(&self, pics_dir: &dyn Dir, id: &str) -> String {
-        format!(
+        vfs::url(
-            "{}/static/pic/{}",
+            &self.site,
-            self.site,
+            pics_dir,
-            self.pics.get(id).map(|x| &**x).unwrap_or("404.png")
+            self.pics
+                .get(id)
+                .map(|x| &**x)
+                .unwrap_or(VPath::new("404.png")),
         )
+        .expect("pics_dir is not anchored anywhere")
+    }
+
+    pub fn pic_size(&self, pics_dir: &dyn Dir, id: &str) -> Option<ImageSize> {
+        self.pics.get(id).and_then(|path| pics_dir.image_size(path))
     }
 
     /// Loads all syntax definition files.
-    pub fn load_syntaxes(&mut self, dir: &Path) -> anyhow::Result<()> {
+    pub fn load_syntaxes(&mut self, dir: &dyn Dir) -> anyhow::Result<()> {
-        for entry in WalkDir::new(dir) {
+        vfs::walk_dir_rec(dir, VPath::ROOT, &mut |path| {
-            let entry = entry?;
+            if path.extension() == Some("json") {
-            if entry.path().extension() == Some(OsStr::new("json")) {
+                let name = path
-                let name = entry
-                    .path()
                     .file_stem()
-                    .expect("syntax file name should have a stem")
+                    .expect("syntax file name should have a stem due to the .json extension");
-                    .to_string_lossy();
                 debug!("loading syntax {name:?}");
 
-                let syntax: Syntax = serde_json::from_reader(BufReader::new(
+                let result: Result<Syntax, _> = dir
-                    File::open(entry.path()).context("could not open syntax file")?,
+                    .content(path)
-                ))
+                    .ok_or_else(|| anyhow!("syntax .json is not a file"))
-                .context("could not deserialize syntax file")?;
+                    .and_then(|b| {
+                        String::from_utf8(b).context("syntax .json contains invalid UTF-8")
+                    })
+                    .and_then(|s| {
+                        serde_json::from_str(&s).context("could not deserialize syntax file")
+                    });
+                match result {
+                    Ok(syntax) => {
                         let compiled = compile_syntax(&syntax);
-                self.syntaxes.insert(name.into_owned(), compiled);
+                        self.syntaxes.insert(name.to_owned(), compiled);
+                    }
+                    Err(err) => error!("error while loading syntax file `{path}`: {err}"),
                 }
             }
 
+            ControlFlow::Continue(())
+        });
+
         Ok(())
     }
 }
 
-/// Data derived from the config.
+pub fn is_image_file(extension: &str) -> bool {
-pub struct ConfigDerivedData {
+    matches!(extension, "png" | "svg" | "jpg" | "jpeg" | "webp")
-    pub image_sizes: HashMap<String, Option<ImageSize>>,
-    pub static_urls: StaticUrls,
-}
-
-/// Image size. This is useful for emitting <img> elements with a specific size to eliminate
-/// layout shifting.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct ImageSize {
-    pub width: u32,
-    pub height: u32,
-}
-
-impl ConfigDerivedData {
-    fn read_image_size(filename: &str) -> Option<ImageSize> {
-        let (width, height) = image::io::Reader::new(BufReader::new(File::open(filename).ok()?))
-            .with_guessed_format()
-            .map_err(ImageError::from)
-            .and_then(|i| i.into_dimensions())
-            // NOTE: Not being able to determine the image size is not the end of the world,
-            // so just warn the user if we couldn't do it.
-            // For example, currently SVG is not supported at all, which causes this to fail.
-            .inspect_err(|e| warn!("cannot read image size of {filename}: {e}"))
-            .ok()?;
-        Some(ImageSize { width, height })
-    }
-
-    pub fn image_size(&mut self, filename: &str) -> Option<ImageSize> {
-        if !self.image_sizes.contains_key(filename) {
-            self.image_sizes
-                .insert(filename.to_owned(), Self::read_image_size(filename));
-        }
-        self.image_sizes.get(filename).copied().flatten()
-    }
-
-    pub fn pic_size(&mut self, config: &Config, pic_id: &str) -> Option<ImageSize> {
-        config
-            .pics
-            .get(pic_id)
-            .and_then(|pic_filename| self.image_size(&format!("static/pic/{pic_filename}")))
-    }
 }

crates/treehouse/src/dirs.rs

@@ -0,0 +1,15 @@
+use crate::vfs::DynDir;
+
+#[derive(Debug, Clone)]
+pub struct Dirs {
+    pub root: DynDir,
+
+    pub content: DynDir,
+    pub static_: DynDir,
+    pub template: DynDir,
+
+    // `static` directories
+    pub pic: DynDir,
+    pub emoji: DynDir,
+    pub syntax: DynDir,
+}

crates/treehouse/src/generate/dir_helper.rs

@@ -0,0 +1,37 @@
+use handlebars::{Context, Handlebars, Helper, HelperDef, RenderContext, RenderError, ScopedJson};
+use serde_json::Value;
+
+use crate::vfs::{self, DynDir, VPath};
+
+pub struct DirHelper {
+    site: String,
+    dir: DynDir,
+}
+
+impl DirHelper {
+    pub fn new(site: &str, dir: DynDir) -> Self {
+        Self {
+            site: site.to_owned(),
+            dir,
+        }
+    }
+}
+
+impl HelperDef for DirHelper {
+    fn call_inner<'reg: 'rc, 'rc>(
+        &self,
+        h: &Helper<'reg, 'rc>,
+        _: &'reg Handlebars<'reg>,
+        _: &'rc Context,
+        _: &mut RenderContext<'reg, 'rc>,
+    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+        if let Some(path) = h.param(0).and_then(|v| v.value().as_str()) {
+            let vpath = VPath::try_new(path).map_err(|e| RenderError::new(e.to_string()))?;
+            let url = vfs::url(&self.site, &self.dir, vpath)
+                .ok_or_else(|| RenderError::new("path is not anchored anywhere"))?;
+            Ok(ScopedJson::Derived(Value::String(url)))
+        } else {
+            Err(RenderError::new("missing path string"))
+        }
+    }
+}

crates/treehouse/src/generate/include_static_helper.rs

@@ -0,0 +1,37 @@
+use handlebars::{Context, Handlebars, Helper, HelperDef, RenderContext, RenderError, ScopedJson};
+use serde_json::Value;
+
+use crate::vfs::{DynDir, VPath};
+
+pub struct IncludeStaticHelper {
+    dir: DynDir,
+}
+
+impl IncludeStaticHelper {
+    pub fn new(dir: DynDir) -> Self {
+        Self { dir }
+    }
+}
+
+impl HelperDef for IncludeStaticHelper {
+    fn call_inner<'reg: 'rc, 'rc>(
+        &self,
+        h: &Helper<'reg, 'rc>,
+        _: &'reg Handlebars<'reg>,
+        _: &'rc Context,
+        _: &mut RenderContext<'reg, 'rc>,
+    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+        if let Some(path) = h.param(0).and_then(|v| v.value().as_str()) {
+            let vpath = VPath::try_new(path).map_err(|e| RenderError::new(e.to_string()))?;
+            let url = String::from_utf8(
+                self.dir
+                    .content(vpath)
+                    .ok_or_else(|| RenderError::new("file does not exist"))?,
+            )
+            .map_err(|_| RenderError::new("included file does not contain UTF-8 text"))?;
+            Ok(ScopedJson::Derived(Value::String(url)))
+        } else {
+            Err(RenderError::new("missing path string"))
+        }
+    }
+}

crates/treehouse/src/html.rs

@@ -3,13 +3,12 @@ use std::fmt::{self, Display, Write};
 pub mod breadcrumbs;
 mod djot;
 pub mod highlight;
-mod markdown;
 pub mod navmap;
 pub mod tree;
 
-pub struct EscapeAttribute<'a>(&'a str);
+pub struct EscapeAttribute<'a>(pub &'a str);
 
-impl<'a> Display for EscapeAttribute<'a> {
+impl Display for EscapeAttribute<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         for c in self.0.chars() {
             if c == '"' {
@@ -22,9 +21,9 @@ impl<'a> Display for EscapeAttribute<'a> {
     }
 }
 
-pub struct EscapeHtml<'a>(&'a str);
+pub struct EscapeHtml<'a>(pub &'a str);
 
-impl<'a> Display for EscapeHtml<'a> {
+impl Display for EscapeHtml<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         for c in self.0.chars() {
             match c {

crates/treehouse/src/html/djot.rs

@@ -17,22 +17,25 @@ use jotdown::OrderedListNumbering::*;
 use jotdown::SpanLinkType;
 
 use crate::config::Config;
-use crate::config::ConfigDerivedData;
+use crate::dirs::Dirs;
 use crate::state::FileId;
 use crate::state::Treehouse;
+use crate::vfs;
 
 use super::highlight::highlight;
 
 /// [`Render`] implementor that writes HTML output.
 pub struct Renderer<'a> {
     pub config: &'a Config,
-    pub config_derived_data: &'a mut ConfigDerivedData,
+
-    pub treehouse: &'a mut Treehouse,
+    pub dirs: &'a Dirs,
+
+    pub treehouse: &'a Treehouse,
     pub file_id: FileId,
     pub page_id: String,
 }
 
-impl<'a> Renderer<'a> {
+impl Renderer<'_> {
     #[must_use]
     pub fn render(
         self,
@@ -369,25 +372,18 @@ impl<'a> Writer<'a> {
                                     r#"<img class="placeholder-image" loading="lazy" src=""#,
                                 );
 
-                                let filename = self.renderer.config.pics.get(placeholder_pic_id);
+                                let pic_url = self
-                                let pic_url = filename
+                                    .renderer
-                                    .and_then(|filename| {
+                                    .config
-                                        self.renderer
+                                    .pic_url(&*self.renderer.dirs.pic, placeholder_pic_id);
-                                            .config_derived_data
-                                            .static_urls
-                                            .get(&format!("pic/{filename}"))
-                                            .ok()
-                                    })
-                                    .unwrap_or_default();
                                 write_attr(&pic_url, out);
                                 out.push('"');
 
-                                let image_size = filename.and_then(|filename| {
+                                if let Some(image_size) = self
-                                    self.renderer
+                                    .renderer
-                                        .config_derived_data
+                                    .config
-                                        .image_size(&format!("static/pic/{filename}"))
+                                    .pic_size(&*self.renderer.dirs.pic, placeholder_pic_id)
-                                });
+                                {
-                                if let Some(image_size) = image_size {
                                     write!(
                                         out,
                                         r#" width="{}" height="{}""#,
@@ -482,6 +478,7 @@ impl<'a> Writer<'a> {
                             if !src.is_empty() {
                                 out.push_str(r#"" src=""#);
                                 if let SpanLinkType::Unresolved = link_type {
+                                    // TODO: Image size.
                                     if let Some(resolved) = self.resolve_link(src) {
                                         write_attr(&resolved, out);
                                     } else {
@@ -523,8 +520,7 @@ impl<'a> Writer<'a> {
                         self.renderer.config.syntaxes.get(code_block.language)
                     });
                     if let Some(syntax) = syntax {
-                        // TODO djot: make highlight infallible
+                        highlight(out, syntax, s);
-                        highlight(out, syntax, s).map_err(|_| std::fmt::Error)?;
                     } else {
                         write_text(s, out);
                     }
@@ -547,7 +543,7 @@ impl<'a> Writer<'a> {
                 });
             }
             Event::Symbol(sym) => {
-                if let Some(filename) = self.renderer.config.emoji.get(sym.as_ref()) {
+                if let Some(vpath) = self.renderer.config.emoji.get(sym.as_ref()) {
                     let branch_id = self
                         .renderer
                         .treehouse
@@ -565,12 +561,12 @@ impl<'a> Writer<'a> {
                         out.push_str(r#"">"#)
                     }
 
-                    let url = self
+                    let url = vfs::url(
-                        .renderer
+                        &self.renderer.config.site,
-                        .config_derived_data
+                        &*self.renderer.dirs.emoji,
-                        .static_urls
+                        vpath,
-                        .get(&format!("emoji/{filename}"))
+                    )
-                        .unwrap_or_default();
+                    .expect("emoji directory is not anchored anywhere");
 
                     // TODO: this could do with better alt text
                     write!(
@@ -580,11 +576,7 @@ impl<'a> Writer<'a> {
                     write_attr(&url, out);
                     out.push('"');
 
-                    if let Some(image_size) = self
+                    if let Some(image_size) = self.renderer.dirs.emoji.image_size(vpath) {
-                        .renderer
-                        .config_derived_data
-                        .image_size(&format!("static/emoji/{filename}"))
-                    {
                         write!(
                             out,
                             r#" width="{}" height="{}""#,
@@ -635,10 +627,7 @@ impl<'a> Writer<'a> {
 
     fn resolve_link(&self, link: &str) -> Option<String> {
         let Renderer {
-            config,
+            config, treehouse, ..
-            config_derived_data,
-            treehouse,
-            ..
         } = &self.renderer;
         link.split_once(':').and_then(|(kind, linked)| match kind {
             "def" => config.defs.get(linked).cloned(),
@@ -653,12 +642,7 @@ impl<'a> Writer<'a> {
                     )
                 }),
             "page" => Some(config.page_url(linked)),
-            "pic" => config.pics.get(linked).and_then(|filename| {
+            "pic" => Some(config.pic_url(&*self.renderer.dirs.pic, linked)),
-                config_derived_data
-                    .static_urls
-                    .get(&format!("pic/{filename}"))
-                    .ok()
-            }),
             _ => None,
         })
     }

crates/treehouse/src/html/highlight.rs

@@ -11,13 +11,14 @@
 pub mod compiled;
 pub mod tokenize;
 
-use std::{collections::HashMap, io};
+use std::{collections::HashMap, fmt::Write};
 
-use pulldown_cmark::escape::{escape_html, StrWrite};
 use serde::{Deserialize, Serialize};
 
 use self::compiled::CompiledSyntax;
 
+use super::EscapeHtml;
+
 /// Syntax definition.
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct Syntax {
@@ -81,14 +82,13 @@ pub struct Keyword {
     pub only_replaces: Option<String>,
 }
 
-pub fn highlight(mut w: impl StrWrite, syntax: &CompiledSyntax, code: &str) -> io::Result<()> {
+pub fn highlight(out: &mut String, syntax: &CompiledSyntax, code: &str) {
     let tokens = syntax.tokenize(code);
     for token in tokens {
-        w.write_str("<span class=\"")?;
+        out.push_str("<span class=\"");
-        escape_html(&mut w, &syntax.token_names[token.id])?;
+        _ = write!(out, "{}", EscapeHtml(&syntax.token_names[token.id]));
-        w.write_str("\">")?;
+        out.push_str("\">");
-        escape_html(&mut w, &code[token.range])?;
+        _ = write!(out, "{}", EscapeHtml(&code[token.range]));
-        w.write_str("</span>")?;
+        out.push_str("</span>");
     }
-    Ok(())
 }

crates/treehouse/src/html/markdown.rs

@@ -1,716 +0,0 @@
-// NOTE: This code is pasted pretty much verbatim from pulldown-cmark but tweaked to have my own
-// cool additions.
-
-// Copyright 2015 Google Inc. All rights reserved.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//! HTML renderer that takes an iterator of events as input.
-
-use std::collections::HashMap;
-use std::io;
-
-use pulldown_cmark::escape::{escape_href, escape_html, StrWrite};
-use pulldown_cmark::{Alignment, CodeBlockKind, Event, LinkType, Tag};
-use pulldown_cmark::{CowStr, Event::*};
-
-use crate::config::{Config, ConfigDerivedData, ImageSize};
-use crate::html::highlight::highlight;
-use crate::state::Treehouse;
-
-enum TableState {
-    Head,
-    Body,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-enum CodeBlockState<'a> {
-    NotInCodeBlock,
-    InCodeBlock(Option<CowStr<'a>>),
-}
-
-struct HtmlWriter<'a, I, W> {
-    treehouse: &'a Treehouse,
-    config: &'a Config,
-    config_derived_data: &'a mut ConfigDerivedData,
-    page_id: &'a str,
-
-    /// Iterator supplying events.
-    iter: I,
-
-    /// Writer to write to.
-    writer: W,
-
-    /// Whether or not the last write wrote a newline.
-    end_newline: bool,
-
-    table_state: TableState,
-    table_alignments: Vec<Alignment>,
-    table_cell_index: usize,
-    numbers: HashMap<CowStr<'a>, usize>,
-
-    code_block_state: CodeBlockState<'a>,
-}
-
-impl<'a, I, W> HtmlWriter<'a, I, W>
-where
-    I: Iterator<Item = Event<'a>>,
-    W: StrWrite,
-{
-    fn new(
-        treehouse: &'a Treehouse,
-        config: &'a Config,
-        config_derived_data: &'a mut ConfigDerivedData,
-        page_id: &'a str,
-        iter: I,
-        writer: W,
-    ) -> Self {
-        Self {
-            treehouse,
-            config,
-            config_derived_data,
-            page_id,
-
-            iter,
-            writer,
-            end_newline: true,
-            table_state: TableState::Head,
-            table_alignments: vec![],
-            table_cell_index: 0,
-            numbers: HashMap::new(),
-            code_block_state: CodeBlockState::NotInCodeBlock,
-        }
-    }
-
-    /// Writes a new line.
-    fn write_newline(&mut self) -> io::Result<()> {
-        self.end_newline = true;
-        self.writer.write_str("\n")
-    }
-
-    /// Writes a buffer, and tracks whether or not a newline was written.
-    #[inline]
-    fn write(&mut self, s: &str) -> io::Result<()> {
-        self.writer.write_str(s)?;
-
-        if !s.is_empty() {
-            self.end_newline = s.ends_with('\n');
-        }
-        Ok(())
-    }
-
-    fn run(mut self) -> io::Result<()> {
-        while let Some(event) = self.iter.next() {
-            match event {
-                Start(tag) => {
-                    self.start_tag(tag)?;
-                }
-                End(tag) => {
-                    self.end_tag(tag)?;
-                }
-                Text(text) => {
-                    self.run_text(&text)?;
-                    self.end_newline = text.ends_with('\n');
-                }
-                Code(text) => {
-                    self.write("<code>")?;
-                    escape_html(&mut self.writer, &text)?;
-                    self.write("</code>")?;
-                }
-                Html(html) => {
-                    self.write(&html)?;
-                }
-                SoftBreak => {
-                    self.write_newline()?;
-                }
-                HardBreak => {
-                    self.write("<br />\n")?;
-                }
-                Rule => {
-                    if self.end_newline {
-                        self.write("<hr />\n")?;
-                    } else {
-                        self.write("\n<hr />\n")?;
-                    }
-                }
-                FootnoteReference(name) => {
-                    let len = self.numbers.len() + 1;
-                    self.write("<sup class=\"footnote-reference\"><a href=\"#")?;
-                    escape_html(&mut self.writer, &name)?;
-                    self.write("\">")?;
-                    let number = *self.numbers.entry(name).or_insert(len);
-                    write!(&mut self.writer, "{}", number)?;
-                    self.write("</a></sup>")?;
-                }
-                TaskListMarker(true) => {
-                    self.write("<input disabled=\"\" type=\"checkbox\" checked=\"\"/>\n")?;
-                }
-                TaskListMarker(false) => {
-                    self.write("<input disabled=\"\" type=\"checkbox\"/>\n")?;
-                }
-            }
-        }
-        Ok(())
-    }
-
-    /// Writes the start of an HTML tag.
-    fn start_tag(&mut self, tag: Tag<'a>) -> io::Result<()> {
-        match tag {
-            Tag::Paragraph => {
-                if self.end_newline {
-                    self.write("<p>")
-                } else {
-                    self.write("\n<p>")
-                }
-            }
-            Tag::Heading(level, id, classes) => {
-                if self.end_newline {
-                    self.end_newline = false;
-                    self.write("<")?;
-                } else {
-                    self.write("\n<")?;
-                }
-                write!(&mut self.writer, "{}", level)?;
-                if let Some(id) = id {
-                    self.write(" id=\"")?;
-                    escape_html(&mut self.writer, id)?;
-                    self.write("\"")?;
-                }
-                let mut classes = classes.iter();
-                if let Some(class) = classes.next() {
-                    self.write(" class=\"")?;
-                    escape_html(&mut self.writer, class)?;
-                    for class in classes {
-                        self.write(" ")?;
-                        escape_html(&mut self.writer, class)?;
-                    }
-                    self.write("\"")?;
-                }
-                self.write(">")
-            }
-            Tag::Table(alignments) => {
-                self.table_alignments = alignments;
-                self.write("<table>")
-            }
-            Tag::TableHead => {
-                self.table_state = TableState::Head;
-                self.table_cell_index = 0;
-                self.write("<thead><tr>")
-            }
-            Tag::TableRow => {
-                self.table_cell_index = 0;
-                self.write("<tr>")
-            }
-            Tag::TableCell => {
-                match self.table_state {
-                    TableState::Head => {
-                        self.write("<th")?;
-                    }
-                    TableState::Body => {
-                        self.write("<td")?;
-                    }
-                }
-                match self.table_alignments.get(self.table_cell_index) {
-                    Some(&Alignment::Left) => self.write(" style=\"text-align: left\">"),
-                    Some(&Alignment::Center) => self.write(" style=\"text-align: center\">"),
-                    Some(&Alignment::Right) => self.write(" style=\"text-align: right\">"),
-                    _ => self.write(">"),
-                }
-            }
-            Tag::BlockQuote => {
-                if self.end_newline {
-                    self.write("<blockquote>\n")
-                } else {
-                    self.write("\n<blockquote>\n")
-                }
-            }
-            Tag::CodeBlock(info) => {
-                self.code_block_state = CodeBlockState::InCodeBlock(None);
-                if !self.end_newline {
-                    self.write_newline()?;
-                }
-                match info {
-                    CodeBlockKind::Fenced(language) => {
-                        self.code_block_state = CodeBlockState::InCodeBlock(Some(language.clone()));
-                        match CodeBlockMode::parse(&language) {
-                            CodeBlockMode::PlainText => self.write("<pre><code>"),
-                            CodeBlockMode::SyntaxHighlightOnly { language } => {
-                                self.write("<pre><code class=\"language-")?;
-                                escape_html(&mut self.writer, language)?;
-                                if self.config.syntaxes.contains_key(language) {
-                                    self.write(" th-syntax-highlighting")?;
-                                }
-                                self.write("\">")
-                            }
-                            CodeBlockMode::LiterateProgram {
-                                language,
-                                kind,
-                                program_name,
-                            } => {
-                                self.write(match &kind {
-                                    LiterateCodeKind::Input => {
-                                        "<th-literate-program data-mode=\"input\" "
-                                    }
-                                    LiterateCodeKind::Output { .. } => {
-                                        "<th-literate-program data-mode=\"output\" "
-                                    }
-                                })?;
-                                self.write("data-program=\"")?;
-                                escape_href(&mut self.writer, self.page_id)?;
-                                self.write(":")?;
-                                escape_html(&mut self.writer, program_name)?;
-                                self.write("\" data-language=\"")?;
-                                escape_html(&mut self.writer, language)?;
-                                self.write("\" role=\"code\">")?;
-
-                                if let LiterateCodeKind::Output { placeholder_pic_id } = kind {
-                                    if !placeholder_pic_id.is_empty() {
-                                        self.write("<img class=\"placeholder-image\" loading=\"lazy\" src=\"")?;
-                                        escape_html(
-                                            &mut self.writer,
-                                            &self.config.pic_url(placeholder_pic_id),
-                                        )?;
-                                        self.write("\"")?;
-                                        if let Some(ImageSize { width, height }) = self
-                                            .config_derived_data
-                                            .pic_size(self.config, placeholder_pic_id)
-                                        {
-                                            self.write(&format!(
-                                                " width=\"{width}\" height=\"{height}\""
-                                            ))?;
-                                        }
-                                        self.write(">")?;
-                                    }
-                                }
-
-                                self.write("<pre class=\"placeholder-console\">")?;
-                                Ok(())
-                            }
-                        }
-                    }
-                    CodeBlockKind::Indented => self.write("<pre><code>"),
-                }
-            }
-            Tag::List(Some(1)) => {
-                if self.end_newline {
-                    self.write("<ol>\n")
-                } else {
-                    self.write("\n<ol>\n")
-                }
-            }
-            Tag::List(Some(start)) => {
-                if self.end_newline {
-                    self.write("<ol start=\"")?;
-                } else {
-                    self.write("\n<ol start=\"")?;
-                }
-                write!(&mut self.writer, "{}", start)?;
-                self.write("\">\n")
-            }
-            Tag::List(None) => {
-                if self.end_newline {
-                    self.write("<ul>\n")
-                } else {
-                    self.write("\n<ul>\n")
-                }
-            }
-            Tag::Item => {
-                if self.end_newline {
-                    self.write("<li>")
-                } else {
-                    self.write("\n<li>")
-                }
-            }
-            Tag::Emphasis => self.write("<em>"),
-            Tag::Strong => self.write("<strong>"),
-            Tag::Strikethrough => self.write("<del>"),
-            Tag::Link(LinkType::Email, dest, title) => {
-                self.write("<a href=\"mailto:")?;
-                escape_href(&mut self.writer, &dest)?;
-                if !title.is_empty() {
-                    self.write("\" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                }
-                self.write("\">")
-            }
-            Tag::Link(_link_type, dest, title) => {
-                self.write("<a href=\"")?;
-                escape_href(&mut self.writer, &dest)?;
-                if !title.is_empty() {
-                    self.write("\" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                }
-                self.write("\">")
-            }
-            Tag::Image(_link_type, dest, title) => {
-                self.write("<img class=\"pic\" src=\"")?;
-                escape_href(&mut self.writer, &dest)?;
-                self.write("\" alt=\"")?;
-                self.raw_text()?;
-                if !title.is_empty() {
-                    self.write("\" title=\"")?;
-                    escape_html(&mut self.writer, &title)?;
-                }
-                self.write("\" />")
-            }
-            Tag::FootnoteDefinition(name) => {
-                if self.end_newline {
-                    self.write("<div class=\"footnote-definition\" id=\"")?;
-                } else {
-                    self.write("\n<div class=\"footnote-definition\" id=\"")?;
-                }
-                escape_html(&mut self.writer, &name)?;
-                self.write("\"><sup class=\"footnote-definition-label\">")?;
-                let len = self.numbers.len() + 1;
-                let number = *self.numbers.entry(name).or_insert(len);
-                write!(&mut self.writer, "{}", number)?;
-                self.write("</sup>")
-            }
-        }
-    }
-
-    fn end_tag(&mut self, tag: Tag) -> io::Result<()> {
-        match tag {
-            Tag::Paragraph => {
-                self.write("</p>\n")?;
-            }
-            Tag::Heading(level, _id, _classes) => {
-                self.write("</")?;
-                write!(&mut self.writer, "{}", level)?;
-                self.write(">\n")?;
-            }
-            Tag::Table(_) => {
-                self.write("</tbody></table>\n")?;
-            }
-            Tag::TableHead => {
-                self.write("</tr></thead><tbody>\n")?;
-                self.table_state = TableState::Body;
-            }
-            Tag::TableRow => {
-                self.write("</tr>\n")?;
-            }
-            Tag::TableCell => {
-                match self.table_state {
-                    TableState::Head => {
-                        self.write("</th>")?;
-                    }
-                    TableState::Body => {
-                        self.write("</td>")?;
-                    }
-                }
-                self.table_cell_index += 1;
-            }
-            Tag::BlockQuote => {
-                self.write("</blockquote>\n")?;
-            }
-            Tag::CodeBlock(kind) => {
-                self.write(match kind {
-                    CodeBlockKind::Fenced(language) => match CodeBlockMode::parse(&language) {
-                        CodeBlockMode::LiterateProgram { .. } => "</pre></th-literate-program>",
-                        _ => "</code></pre>",
-                    },
-                    _ => "</code></pre>\n",
-                })?;
-                self.code_block_state = CodeBlockState::NotInCodeBlock;
-            }
-            Tag::List(Some(_)) => {
-                self.write("</ol>\n")?;
-            }
-            Tag::List(None) => {
-                self.write("</ul>\n")?;
-            }
-            Tag::Item => {
-                self.write("</li>\n")?;
-            }
-            Tag::Emphasis => {
-                self.write("</em>")?;
-            }
-            Tag::Strong => {
-                self.write("</strong>")?;
-            }
-            Tag::Strikethrough => {
-                self.write("</del>")?;
-            }
-            Tag::Link(_, _, _) => {
-                self.write("</a>")?;
-            }
-            Tag::Image(_, _, _) => (), // shouldn't happen, handled in start
-            Tag::FootnoteDefinition(_) => {
-                self.write("</div>\n")?;
-            }
-        }
-        Ok(())
-    }
-
-    fn run_text(&mut self, text: &str) -> io::Result<()> {
-        struct EmojiParser<'a> {
-            text: &'a str,
-            position: usize,
-        }
-
-        enum Token<'a> {
-            Text(&'a str),
-            Emoji(&'a str),
-        }
-
-        impl<'a> EmojiParser<'a> {
-            fn current(&self) -> Option<char> {
-                self.text[self.position..].chars().next()
-            }
-
-            fn next_token(&mut self) -> Option<Token<'a>> {
-                match self.current() {
-                    Some(':') => {
-                        let text_start = self.position;
-                        self.position += 1;
-                        if self.current().is_some_and(|c| c.is_alphabetic()) {
-                            let name_start = self.position;
-                            while let Some(c) = self.current() {
-                                if c.is_alphanumeric() || c == '_' {
-                                    self.position += c.len_utf8();
-                                } else {
-                                    break;
-                                }
-                            }
-                            if self.current() == Some(':') {
-                                let name_end = self.position;
-                                self.position += 1;
-                                Some(Token::Emoji(&self.text[name_start..name_end]))
-                            } else {
-                                Some(Token::Text(&self.text[text_start..self.position]))
-                            }
-                        } else {
-                            Some(Token::Text(&self.text[text_start..self.position]))
-                        }
-                    }
-                    Some(_) => {
-                        let start = self.position;
-                        while let Some(c) = self.current() {
-                            if c == ':' {
-                                break;
-                            } else {
-                                self.position += c.len_utf8();
-                            }
-                        }
-                        let end = self.position;
-                        Some(Token::Text(&self.text[start..end]))
-                    }
-                    None => None,
-                }
-            }
-        }
-
-        if let CodeBlockState::InCodeBlock(language) = &self.code_block_state {
-            let code_block_mode = language
-                .as_ref()
-                .map(|language| CodeBlockMode::parse(language));
-            let highlighting_language = code_block_mode
-                .as_ref()
-                .and_then(|mode| mode.highlighting_language());
-            let syntax =
-                highlighting_language.and_then(|language| self.config.syntaxes.get(language));
-            if let Some(syntax) = syntax {
-                highlight(&mut self.writer, syntax, text)?;
-            } else {
-                escape_html(&mut self.writer, text)?;
-            }
-        } else {
-            let mut parser = EmojiParser { text, position: 0 };
-            while let Some(token) = parser.next_token() {
-                match token {
-                    Token::Text(text) => escape_html(&mut self.writer, text)?,
-                    Token::Emoji(name) => {
-                        if let Some(filename) = self.config.emoji.get(name) {
-                            let branch_id = self
-                                .treehouse
-                                .branches_by_named_id
-                                .get(&format!("emoji/{name}"))
-                                .copied();
-                            if let Some(branch) = branch_id.map(|id| self.treehouse.tree.branch(id))
-                            {
-                                self.writer.write_str("<a href=\"")?;
-                                escape_html(&mut self.writer, &self.config.site)?;
-                                self.writer.write_str("/b?")?;
-                                escape_html(&mut self.writer, &branch.attributes.id)?;
-                                self.writer.write_str("\">")?;
-                            }
-
-                            self.writer
-                                .write_str("<img data-cast=\"emoji\" title=\":")?;
-                            escape_html(&mut self.writer, name)?;
-                            self.writer.write_str(":\" src=\"")?;
-                            let url = self
-                                .config_derived_data
-                                .static_urls
-                                .get(&format!("emoji/{filename}"))
-                                .unwrap_or_default();
-                            escape_html(&mut self.writer, &url)?;
-                            self.writer.write_str("\" alt=\"")?;
-                            escape_html(&mut self.writer, name)?;
-                            if let Some(image_size) = self
-                                .config_derived_data
-                                .image_size(&format!("static/emoji/{filename}"))
-                            {
-                                write!(
-                                    self.writer,
-                                    "\" width=\"{}\" height=\"{}",
-                                    image_size.width, image_size.height
-                                )?;
-                            }
-                            self.writer.write_str("\">")?;
-
-                            if branch_id.is_some() {
-                                self.writer.write_str("</a>")?;
-                            }
-                        } else {
-                            self.writer.write_str(":")?;
-                            escape_html(&mut self.writer, name)?;
-                            self.writer.write_str(":")?;
-                        }
-                    }
-                }
-            }
-        }
-
-        Ok(())
-    }
-
-    // run raw text, consuming end tag
-    fn raw_text(&mut self) -> io::Result<()> {
-        let mut nest = 0;
-        while let Some(event) = self.iter.next() {
-            match event {
-                Start(_) => nest += 1,
-                End(_) => {
-                    if nest == 0 {
-                        break;
-                    }
-                    nest -= 1;
-                }
-                Html(text) | Code(text) | Text(text) => {
-                    escape_html(&mut self.writer, &text)?;
-                    self.end_newline = text.ends_with('\n');
-                }
-                SoftBreak | HardBreak | Rule => {
-                    self.write(" ")?;
-                }
-                FootnoteReference(name) => {
-                    let len = self.numbers.len() + 1;
-                    let number = *self.numbers.entry(name).or_insert(len);
-                    write!(&mut self.writer, "[{}]", number)?;
-                }
-                TaskListMarker(true) => self.write("[x]")?,
-                TaskListMarker(false) => self.write("[ ]")?,
-            }
-        }
-        Ok(())
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-enum LiterateCodeKind<'a> {
-    Input,
-    Output { placeholder_pic_id: &'a str },
-}
-
-enum CodeBlockMode<'a> {
-    PlainText,
-    SyntaxHighlightOnly {
-        language: &'a str,
-    },
-    LiterateProgram {
-        language: &'a str,
-        kind: LiterateCodeKind<'a>,
-        program_name: &'a str,
-    },
-}
-
-impl<'a> CodeBlockMode<'a> {
-    fn parse(language: &'a str) -> CodeBlockMode<'a> {
-        if language.is_empty() {
-            CodeBlockMode::PlainText
-        } else if let Some((language, program_name)) = language.split_once(' ') {
-            let (program_name, placeholder_pic_id) =
-                program_name.split_once(' ').unwrap_or((program_name, ""));
-            CodeBlockMode::LiterateProgram {
-                language,
-                kind: if language == "output" {
-                    LiterateCodeKind::Output { placeholder_pic_id }
-                } else {
-                    LiterateCodeKind::Input
-                },
-                program_name: program_name.split(' ').next().unwrap(),
-            }
-        } else {
-            CodeBlockMode::SyntaxHighlightOnly { language }
-        }
-    }
-
-    fn highlighting_language(&self) -> Option<&str> {
-        if let CodeBlockMode::LiterateProgram { language, .. }
-        | CodeBlockMode::SyntaxHighlightOnly { language } = self
-        {
-            Some(language)
-        } else {
-            None
-        }
-    }
-}
-
-/// Iterate over an `Iterator` of `Event`s, generate HTML for each `Event`, and
-/// push it to a `String`.
-///
-/// # Examples
-///
-/// ```
-/// use pulldown_cmark::{html, Parser};
-///
-/// let markdown_str = r#"
-/// hello
-/// =====
-///
-/// * alpha
-/// * beta
-/// "#;
-/// let parser = Parser::new(markdown_str);
-///
-/// let mut html_buf = String::new();
-/// html::push_html(&mut html_buf, parser);
-///
-/// assert_eq!(html_buf, r#"<h1>hello</h1>
-/// <ul>
-/// <li>alpha</li>
-/// <li>beta</li>
-/// </ul>
-/// "#);
-/// ```
-pub fn push_html<'a, I>(
-    s: &mut String,
-    treehouse: &'a Treehouse,
-    config: &'a Config,
-    config_derived_data: &'a mut ConfigDerivedData,
-    page_id: &'a str,
-    iter: I,
-) where
-    I: Iterator<Item = Event<'a>>,
-{
-    HtmlWriter::new(treehouse, config, config_derived_data, page_id, iter, s)
-        .run()
-        .unwrap();
-}

crates/treehouse/src/html/navmap.rs

@@ -1,50 +1,39 @@
 use std::collections::HashMap;
 
-use serde::Serialize;
-
 use crate::{
     state::Treehouse,
     tree::{attributes::Content, SemaBranchId},
 };
 
-#[derive(Debug, Clone, Default, Serialize)]
+#[derive(Debug, Clone, Default)]
+struct NavigationMapBuilder {
+    stack: Vec<String>,
+    navigation_map: NavigationMap,
+}
+
+impl NavigationMapBuilder {
+    fn enter_tree(&mut self, tree: String) {
+        self.stack.push(tree.clone());
+        self.navigation_map.paths.insert(tree, self.stack.clone());
+    }
+
+    fn exit_tree(&mut self) {
+        self.stack.pop();
+    }
+
+    fn finish(self) -> NavigationMap {
+        self.navigation_map
+    }
+}
+
+#[derive(Debug, Clone, Default)]
 pub struct NavigationMap {
     /// Tells you which pages need to be opened to get to the key.
     pub paths: HashMap<String, Vec<String>>,
 }
 
 impl NavigationMap {
-    pub fn to_javascript(&self) -> String {
+    pub fn build(treehouse: &Treehouse, root_tree_path: &str) -> Self {
-        format!(
-            "export const navigationMap = {};",
-            serde_json::to_string(&self.paths)
-                .expect("serialization of the navigation map should not fail")
-        )
-    }
-}
-
-#[derive(Debug, Clone, Default)]
-pub struct NavigationMapBuilder {
-    stack: Vec<String>,
-    navigation_map: NavigationMap,
-}
-
-impl NavigationMapBuilder {
-    pub fn enter_tree(&mut self, tree: String) {
-        self.stack.push(tree.clone());
-        self.navigation_map.paths.insert(tree, self.stack.clone());
-    }
-
-    pub fn exit_tree(&mut self) {
-        self.stack.pop();
-    }
-
-    pub fn finish(self) -> NavigationMap {
-        self.navigation_map
-    }
-}
-
-pub fn build_navigation_map(treehouse: &Treehouse, root_tree_path: &str) -> NavigationMap {
         let mut builder = NavigationMapBuilder::default();
 
         fn rec_branch(
@@ -80,3 +69,4 @@ pub fn build_navigation_map(treehouse: &Treehouse, root_tree_path: &str) -> Navi
 
         builder.finish()
     }
+}

crates/treehouse/src/html/tree.rs

@@ -1,11 +1,10 @@
 use std::{borrow::Cow, fmt::Write};
 
-use pulldown_cmark::{BrokenLink, LinkType};
 use treehouse_format::pull::BranchKind;
 
 use crate::{
-    cli::Paths,
+    config::Config,
-    config::{Config, ConfigDerivedData, Markup},
+    dirs::Dirs,
     html::EscapeAttribute,
     state::{FileId, Treehouse},
     tree::{
@@ -14,14 +13,13 @@ use crate::{
     },
 };
 
-use super::{djot, markdown, EscapeHtml};
+use super::{djot, EscapeHtml};
 
 pub fn branch_to_html(
     s: &mut String,
-    treehouse: &mut Treehouse,
+    treehouse: &Treehouse,
     config: &Config,
-    config_derived_data: &mut ConfigDerivedData,
+    dirs: &Dirs,
-    paths: &Paths<'_>,
     file_id: FileId,
     branch_id: SemaBranchId,
 ) {
@@ -115,73 +113,15 @@ pub fn branch_to_html(
             final_markup.push('\n');
         }
 
-        let broken_link_callback = &mut |broken_link: BrokenLink<'_>| {
-            if let LinkType::Reference | LinkType::Shortcut = broken_link.link_type {
-                broken_link
-                    .reference
-                    .split_once(':')
-                    .and_then(|(kind, linked)| match kind {
-                        "def" => config
-                            .defs
-                            .get(linked)
-                            .map(|link| (link.clone().into(), "".into())),
-                        "branch" => treehouse
-                            .branches_by_named_id
-                            .get(linked)
-                            .map(|&branch_id| {
-                                (
-                                    format!(
-                                        "{}/b?{}",
-                                        config.site,
-                                        treehouse.tree.branch(branch_id).attributes.id
-                                    )
-                                    .into(),
-                                    "".into(),
-                                )
-                            }),
-                        "page" => Some((config.page_url(linked).into(), "".into())),
-                        "pic" => config.pics.get(linked).map(|filename| {
-                            (
-                                // NOTE: We can't generate a URL with a hash here yet, because we
-                                // cannot access ConfigDerivedData here due to it being borrowed
-                                // by the Markdown parser.
-                                format!("{}/static/pic/{}", config.site, &filename).into(),
-                                "".into(),
-                            )
-                        }),
-                        _ => None,
-                    })
-            } else {
-                None
-            }
-        };
         if branch.attributes.template {
-            final_markup = mini_template::render(config, treehouse, paths, &final_markup);
+            final_markup = mini_template::render(config, treehouse, dirs, &final_markup);
         }
         s.push_str("<th-bc>");
-        match config.markup {
+
-            Markup::Markdown => {
-                let markdown_parser = pulldown_cmark::Parser::new_with_broken_link_callback(
-                    &final_markup,
-                    {
-                        use pulldown_cmark::Options;
-                        Options::ENABLE_STRIKETHROUGH | Options::ENABLE_TABLES
-                    },
-                    Some(broken_link_callback),
-                );
-                markdown::push_html(
-                    s,
-                    treehouse,
-                    config,
-                    config_derived_data,
-                    treehouse.tree_path(file_id).expect(".tree file expected"),
-                    markdown_parser,
-                )
-            }
-            Markup::Djot => {
         let events: Vec<_> = jotdown::Parser::new(&final_markup)
             .into_offset_iter()
             .collect();
+        // TODO: Report rendering diagnostics.
         let render_diagnostics = djot::Renderer {
             page_id: treehouse
                 .tree_path(file_id)
@@ -189,13 +129,12 @@ pub fn branch_to_html(
                 .to_owned(),
 
             config,
-                    config_derived_data,
+            dirs,
+
             treehouse,
             file_id,
         }
         .render(&events, s);
-            }
-        };
 
         let branch = treehouse.tree.branch(branch_id);
         if let Content::Link(link) = &branch.attributes.content {
@@ -247,15 +186,7 @@ pub fn branch_to_html(
                 let num_children = branch.children.len();
                 for i in 0..num_children {
                     let child_id = treehouse.tree.branch(branch_id).children[i];
-                    branch_to_html(
+                    branch_to_html(s, treehouse, config, dirs, file_id, child_id);
-                        s,
-                        treehouse,
-                        config,
-                        config_derived_data,
-                        paths,
-                        file_id,
-                        child_id,
-                    );
                 }
                 s.push_str("</ul>");
             }
@@ -269,24 +200,15 @@ pub fn branch_to_html(
 
 pub fn branches_to_html(
     s: &mut String,
-    treehouse: &mut Treehouse,
+    treehouse: &Treehouse,
     config: &Config,
-    config_derived_data: &mut ConfigDerivedData,
+    dirs: &Dirs,
-    paths: &Paths<'_>,
     file_id: FileId,
     branches: &[SemaBranchId],
 ) {
     s.push_str("<ul>");
     for &child in branches {
-        branch_to_html(
+        branch_to_html(s, treehouse, config, dirs, file_id, child);
-            s,
-            treehouse,
-            config,
-            config_derived_data,
-            paths,
-            file_id,
-            child,
-        );
     }
     s.push_str("</ul>");
 }

crates/treehouse/src/import_map.rs

@@ -1,11 +1,9 @@
-use std::{ffi::OsStr, path::PathBuf};
+use std::ops::ControlFlow;
 
 use indexmap::IndexMap;
-use log::warn;
 use serde::{Deserialize, Serialize};
-use walkdir::WalkDir;
 
-use crate::static_urls::StaticUrls;
+use crate::vfs::{self, Dir, VPathBuf};
 
 #[derive(Debug, Clone, Serialize)]
 pub struct ImportMap {
@@ -15,49 +13,30 @@ pub struct ImportMap {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct ImportRoot {
     pub name: String,
-    pub path: String,
+    pub path: VPathBuf,
 }
 
 impl ImportMap {
-    pub fn generate(base_url: String, import_roots: &[ImportRoot]) -> Self {
+    pub fn generate(site: &str, root: &dyn Dir, import_roots: &[ImportRoot]) -> Self {
         let mut import_map = ImportMap {
             imports: IndexMap::new(),
         };
 
-        for root in import_roots {
+        for import_root in import_roots {
-            let static_urls = StaticUrls::new(
+            vfs::walk_dir_rec(root, &import_root.path, &mut |path| {
-                PathBuf::from(&root.path),
+                if path.extension() == Some("js") {
-                format!("{base_url}/{}", root.path),
+                    import_map.imports.insert(
+                        format!(
+                            "{}/{}",
+                            import_root.name,
+                            path.strip_prefix(&import_root.path).unwrap_or(path)
+                        ),
+                        vfs::url(site, root, path)
+                            .expect("import directory is not anchored anywhere"),
                     );
-            for entry in WalkDir::new(&root.path) {
-                let entry = match entry {
-                    Ok(entry) => entry,
-                    Err(error) => {
-                        warn!("directory walk failed: {error}");
-                        continue;
-                    }
-                };
-
-                if !entry.file_type().is_dir() && entry.path().extension() == Some(OsStr::new("js"))
-                {
-                    let normalized_path = entry
-                        .path()
-                        .strip_prefix(&root.path)
-                        .unwrap_or(entry.path())
-                        .to_string_lossy()
-                        .replace('\\', "/");
-                    match static_urls.get(&normalized_path) {
-                        Ok(url) => {
-                            import_map
-                                .imports
-                                .insert(format!("{}/{normalized_path}", root.name), url);
-                        }
-                        Err(error) => {
-                            warn!("could not get static url for {normalized_path}: {error}")
-                        }
-                    }
-                }
                 }
+                ControlFlow::Continue(())
+            });
         }
 
         import_map.imports.sort_unstable_keys();

crates/treehouse/src/include_static.rs

@@ -1,28 +0,0 @@
-use std::path::PathBuf;
-
-use handlebars::{Context, Handlebars, Helper, HelperDef, RenderContext, RenderError, ScopedJson};
-use serde_json::Value;
-
-pub struct IncludeStatic {
-    pub base_dir: PathBuf,
-}
-
-impl HelperDef for IncludeStatic {
-    fn call_inner<'reg: 'rc, 'rc>(
-        &self,
-        helper: &Helper<'reg, 'rc>,
-        _: &'reg Handlebars<'reg>,
-        _: &'rc Context,
-        _: &mut RenderContext<'reg, 'rc>,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
-        if let Some(param) = helper.param(0).and_then(|v| v.value().as_str()) {
-            return Ok(ScopedJson::Derived(Value::String(
-                std::fs::read_to_string(self.base_dir.join(param)).map_err(|error| {
-                    RenderError::new(format!("cannot read static asset {param}: {error}"))
-                })?,
-            )));
-        }
-
-        Err(RenderError::new("asset path must be provided"))
-    }
-}

crates/treehouse/src/lib.rs

@@ -0,0 +1,13 @@
+pub mod cli;
+pub mod config;
+pub mod dirs;
+pub mod fun;
+pub mod generate;
+pub mod history;
+pub mod html;
+pub mod import_map;
+pub mod parse;
+pub mod paths;
+pub mod state;
+pub mod tree;
+pub mod vfs;

crates/treehouse/src/main.rs

@@ -1,71 +1,83 @@
-use std::path::Path;
+use std::fs;
+use std::path::PathBuf;
+use std::sync::Arc;
 
+use anyhow::Context;
 use clap::Parser;
-use cli::{
+use log::error;
-    fix::{fix_all_cli, fix_file_cli},
+use treehouse::cli::serve::serve;
-    serve::serve,
+use treehouse::dirs::Dirs;
-    wc::wc_cli,
+use treehouse::generate::{self, Sources};
-    Command, Paths, ProgramArgs,
+use treehouse::vfs::asynch::AsyncDir;
+use treehouse::vfs::{
+    AnchoredAtExt, Blake3ContentVersionCache, DynDir, ImageSizeCache, ToDynDir, VPathBuf,
+};
+use treehouse::vfs::{Cd, PhysicalDir};
+use treehouse::{
+    cli::{
+        fix::{fix_all_cli, fix_file_cli},
+        wc::wc_cli,
+        Command, ProgramArgs,
+    },
+    vfs::{BufferedFile, MemDir, VPath},
 };
-use generate::{regenerate_or_report_error, LatestRevision};
-use log::{error, info, warn};
 
-mod cli;
+fn vfs_sources() -> anyhow::Result<DynDir> {
-mod config;
+    let mut root = MemDir::new();
-mod fun;
+
-mod generate;
+    root.add(
-mod history;
+        VPath::new("treehouse.toml"),
-mod html;
+        BufferedFile::new(fs::read("treehouse.toml")?).to_dyn(),
-mod import_map;
+    );
-mod include_static;
+    root.add(
-mod parse;
+        VPath::new("static"),
-mod paths;
+        PhysicalDir::new(PathBuf::from("static"))
-mod state;
+            .anchored_at(VPathBuf::new("static"))
-mod static_urls;
+            .to_dyn(),
-mod tree;
+    );
+    root.add(
+        VPath::new("template"),
+        PhysicalDir::new(PathBuf::from("template")).to_dyn(),
+    );
+    root.add(
+        VPath::new("content"),
+        PhysicalDir::new(PathBuf::from("content")).to_dyn(),
+    );
+
+    let root = Blake3ContentVersionCache::new(root);
+    let root = ImageSizeCache::new(root);
+
+    Ok(root.to_dyn())
+}
 
 async fn fallible_main() -> anyhow::Result<()> {
     let args = ProgramArgs::parse();
 
-    let paths = Paths {
+    let src = vfs_sources()?;
-        target_dir: Path::new("target/site"),
+    let dirs = Arc::new(Dirs {
-        template_target_dir: Path::new("target/site/static/html"),
+        root: src.clone(),
-
+        content: Cd::new(src.clone(), VPathBuf::new("content")).to_dyn(),
-        config_file: Path::new("treehouse.toml"),
+        static_: Cd::new(src.clone(), VPathBuf::new("static")).to_dyn(),
-
+        template: Cd::new(src.clone(), VPathBuf::new("template")).to_dyn(),
-        // NOTE: These are intentionally left unconfigurable from within treehouse.toml
+        pic: Cd::new(src.clone(), VPathBuf::new("static/pic")).to_dyn(),
-        // because this is is one of those things that should be consistent between sites.
+        emoji: Cd::new(src.clone(), VPathBuf::new("static/emoji")).to_dyn(),
-        static_dir: Path::new("static"),
+        syntax: Cd::new(src.clone(), VPathBuf::new("static/syntax")).to_dyn(),
-        template_dir: Path::new("template"),
+    });
-        content_dir: Path::new("content"),
-    };
 
     match args.command {
-        Command::Generate(generate_args) => {
-            info!("regenerating using directories: {paths:#?}");
-            let latest_revision = match generate_args.commits_only {
-                true => LatestRevision::LatestCommit,
-                false => LatestRevision::WorkingTree,
-            };
-            regenerate_or_report_error(&paths, latest_revision)?;
-            warn!("`generate` is for debugging only and the files cannot be fully served using a static file server; use `treehouse serve` if you wish to start a treehouse server");
-        }
         Command::Serve {
-            generate: generate_args,
+            generate: _,
             serve: serve_args,
         } => {
-            let latest_revision = match generate_args.commits_only {
+            let sources = Arc::new(Sources::load(&dirs).context("failed to load sources")?);
-                true => LatestRevision::LatestCommit,
+            let target = generate::target(dirs, sources.clone());
-                false => LatestRevision::WorkingTree,
+            serve(sources, AsyncDir::new(target), serve_args.port).await?;
-            };
-            let (config, treehouse) = regenerate_or_report_error(&paths, latest_revision)?;
-            serve(config, treehouse, &paths, serve_args.port).await?;
         }
 
-        Command::Fix(fix_args) => fix_file_cli(fix_args)?,
+        Command::Fix(fix_args) => fix_file_cli(fix_args, &*dirs.content)?.apply().await?,
-        Command::FixAll(fix_args) => fix_all_cli(fix_args, &paths)?,
+        Command::FixAll(fix_args) => fix_all_cli(fix_args, &*dirs.content)?.apply().await?,
 
-        Command::Wc(wc_args) => wc_cli(paths.content_dir, wc_args)?,
+        Command::Wc(wc_args) => wc_cli(&dirs.content, wc_args)?,
 
         Command::Ulid => {
             let mut rng = rand::thread_rng();

crates/treehouse/src/state.rs

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, ops::Range, path::PathBuf};
+use std::{collections::HashMap, ops::Range};
 
 use anyhow::Context;
 use codespan_reporting::{
@@ -6,26 +6,19 @@ use codespan_reporting::{
     files::SimpleFiles,
     term::termcolor::{ColorChoice, StandardStream},
 };
-use serde::Serialize;
 use ulid::Ulid;
 
-use crate::tree::{SemaBranchId, SemaRoots, SemaTree};
+use crate::{
-
+    tree::{SemaBranchId, SemaRoots, SemaTree},
-#[derive(Debug, Clone, Serialize)]
+    vfs::VPathBuf,
-pub struct RevisionInfo {
+};
-    pub is_latest: bool,
-    pub number: usize,
-    pub commit: String,
-    pub commit_short: String,
-}
 
 #[derive(Debug, Clone)]
 pub enum Source {
     Tree {
         input: String,
         tree_path: String,
-        target_path: PathBuf,
+        target_path: VPathBuf,
-        revision_info: RevisionInfo,
     },
     Other(String),
 }
@@ -103,13 +96,6 @@ impl Treehouse {
         }
     }
 
-    pub fn revision_info(&self, file_id: FileId) -> Option<&RevisionInfo> {
-        match self.source(file_id) {
-            Source::Tree { revision_info, .. } => Some(revision_info),
-            Source::Other(_) => None,
-        }
-    }
-
     pub fn next_missingno(&mut self) -> Ulid {
         self.missingno_generator
             .generate()
@@ -117,6 +103,12 @@ impl Treehouse {
     }
 }
 
+impl Default for Treehouse {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 pub struct TomlError {
     pub message: String,
     pub span: Option<Range<usize>>,

crates/treehouse/src/static_urls.rs

@@ -1,89 +0,0 @@
-use std::{
-    collections::HashMap,
-    fs::File,
-    io::{self, BufReader},
-    path::PathBuf,
-    sync::{Mutex, RwLock},
-};
-
-use handlebars::{Context, Handlebars, Helper, HelperDef, RenderContext, RenderError, ScopedJson};
-use serde_json::Value;
-
-pub struct StaticUrls {
-    base_dir: PathBuf,
-    base_url: String,
-    // Really annoying that we have to use an RwLock for this. We only ever generate in a
-    // single-threaded environment.
-    // Honestly it would be a lot more efficient if Handlebars just assumed single-threadedness
-    // and required you to clone it over to different threads.
-    // Stuff like this is why I really want to implement my own templating engine...
-    hash_cache: RwLock<HashMap<String, String>>,
-    missing_files: Mutex<Vec<MissingFile>>,
-}
-
-pub struct MissingFile {
-    pub path: String,
-}
-
-impl StaticUrls {
-    pub fn new(base_dir: PathBuf, base_url: String) -> Self {
-        Self {
-            base_dir,
-            base_url,
-            hash_cache: RwLock::new(HashMap::new()),
-            missing_files: Mutex::new(vec![]),
-        }
-    }
-
-    pub fn get(&self, filename: &str) -> Result<String, io::Error> {
-        let hash_cache = self.hash_cache.read().unwrap();
-        if let Some(cached) = hash_cache.get(filename) {
-            return Ok(cached.to_owned());
-        }
-        drop(hash_cache);
-
-        let mut hasher = blake3::Hasher::new();
-        let file = BufReader::new(File::open(self.base_dir.join(filename))?);
-        hasher.update_reader(file)?;
-        // NOTE: Here the hash is truncated to 8 characters. This is fine, because we don't
-        // care about security here - only detecting changes in files.
-        let hash = format!(
-            "{}/{}?cache=b3-{}",
-            self.base_url,
-            filename,
-            &hasher.finalize().to_hex()[0..8]
-        );
-        {
-            let mut hash_cache = self.hash_cache.write().unwrap();
-            hash_cache.insert(filename.to_owned(), hash.clone());
-        }
-        Ok(hash)
-    }
-
-    pub fn take_missing_files(&self) -> Vec<MissingFile> {
-        std::mem::take(&mut self.missing_files.lock().unwrap())
-    }
-}
-
-impl HelperDef for StaticUrls {
-    fn call_inner<'reg: 'rc, 'rc>(
-        &self,
-        helper: &Helper<'reg, 'rc>,
-        _: &'reg Handlebars<'reg>,
-        _: &'rc Context,
-        _: &mut RenderContext<'reg, 'rc>,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
-        if let Some(param) = helper.param(0).and_then(|v| v.value().as_str()) {
-            return Ok(ScopedJson::Derived(Value::String(
-                self.get(param).unwrap_or_else(|_| {
-                    self.missing_files.lock().unwrap().push(MissingFile {
-                        path: param.to_owned(),
-                    });
-                    format!("{}/{}", self.base_url, param)
-                }),
-            )));
-        }
-
-        Err(RenderError::new("asset path must be provided"))
-    }
-}

crates/treehouse/src/tree.rs

@@ -163,13 +163,7 @@ impl SemaBranch {
     ) -> SemaBranchId {
         let attributes = Self::parse_attributes(treehouse, diagnostics, file_id, &branch);
 
-        let revision_info = treehouse
+        let named_id = attributes.id.to_owned();
-            .revision_info(file_id)
-            .expect(".tree files must have Tree-type sources");
-        let named_id = match revision_info.is_latest {
-            true => attributes.id.to_owned(),
-            false => format!("{}@{}", attributes.id, revision_info.commit_short),
-        };
         let html_id = format!(
             "{}:{}",
             treehouse.tree_path(file_id).unwrap(),

crates/treehouse/src/tree/mini_template.rs

@@ -4,11 +4,16 @@
 //! for injecting *custom, stateful* context into the renderer, which is important for things like
 //! the `pic` template to work.
 
+use std::fmt::Write;
 use std::ops::Range;
 
-use pulldown_cmark::escape::escape_html;
+use crate::{
-
+    config::Config,
-use crate::{cli::Paths, config::Config, state::Treehouse};
+    dirs::Dirs,
+    html::EscapeHtml,
+    state::Treehouse,
+    vfs::{Dir, VPath},
+};
 
 struct Lexer<'a> {
     input: &'a str,
@@ -144,12 +149,12 @@ struct Renderer<'a> {
 
 struct InvalidTemplate;
 
-impl<'a> Renderer<'a> {
+impl Renderer<'_> {
     fn emit_token_verbatim(&mut self, token: &Token) {
         self.output.push_str(&self.lexer.input[token.range.clone()]);
     }
 
-    fn render(&mut self, config: &Config, treehouse: &Treehouse, paths: &Paths<'_>) {
+    fn render(&mut self, config: &Config, treehouse: &Treehouse, dirs: &Dirs) {
         let kind_of = |token: &Token| token.kind;
 
         while let Some(token) = self.lexer.next() {
@@ -166,12 +171,12 @@ impl<'a> Renderer<'a> {
                         match Self::render_template(
                             config,
                             treehouse,
-                            paths,
+                            dirs,
                             self.lexer.input[inside.as_ref().unwrap().range.clone()].trim(),
                         ) {
                             Ok(s) => match escaping {
                                 EscapingMode::EscapeHtml => {
-                                    _ = escape_html(&mut self.output, &s);
+                                    _ = write!(self.output, "{}", EscapeHtml(&s));
                                 }
                                 EscapingMode::NoEscaping => self.output.push_str(&s),
                             },
@@ -193,24 +198,27 @@ impl<'a> Renderer<'a> {
     fn render_template(
         config: &Config,
         _treehouse: &Treehouse,
-        paths: &Paths<'_>,
+        dirs: &Dirs,
         template: &str,
     ) -> Result<String, InvalidTemplate> {
         let (function, arguments) = template.split_once(' ').unwrap_or((template, ""));
         match function {
-            "pic" => Ok(config.pic_url(arguments)),
+            "pic" => Ok(config.pic_url(&*dirs.pic, arguments)),
-            "include_static" => std::fs::read_to_string(paths.static_dir.join(arguments))
+            "include_static" => VPath::try_new(arguments)
-                .map_err(|_| InvalidTemplate),
+                .ok()
+                .and_then(|vpath| dirs.static_.content(vpath))
+                .and_then(|content| String::from_utf8(content).ok())
+                .ok_or(InvalidTemplate),
             _ => Err(InvalidTemplate),
         }
     }
 }
 
-pub fn render(config: &Config, treehouse: &Treehouse, paths: &Paths<'_>, input: &str) -> String {
+pub fn render(config: &Config, treehouse: &Treehouse, dirs: &Dirs, input: &str) -> String {
     let mut renderer = Renderer {
         lexer: Lexer::new(input),
         output: String::new(),
     };
-    renderer.render(config, treehouse, paths);
+    renderer.render(config, treehouse, dirs);
     renderer.output
 }

crates/treehouse/src/vfs.rs

@@ -0,0 +1,247 @@
+//! The treehouse virtual file system.
+//!
+//! Unlike traditional file systems, there is no separation between directories and files.
+//! Instead, our file system is based on _entries_, which may have specific, optional, well-typed
+//! metadata attached to them.
+//! A directory is formed by returning a list of paths from [`dir`][Dir::dir], and a file is
+//! formed by returning `Some` from [`content`][Dir::content].
+//!
+//! This makes using the file system simpler, as you do not have to differentiate between different
+//! entry kinds. All paths act as if they _could_ return byte content, and all paths act as if they
+//! _could_ have children.
+//!
+//! # Composability
+//!
+//! [`Dir`]s are composable. The [`Dir`] itself starts off with the root path ([`VPath::ROOT`]),
+//! which may contain further [`dir`][Dir::dir] entries, or content by itself.
+//! This makes it possible to nest a [`Dir`] under another [`Dir`].
+//!
+//! Additionally, there's also the inverse operation, [`Cd`] (named after the `cd`
+//! _change directory_ shell command), which returns a [`Dir`] viewing a subpath within another
+//! [`Dir`].
+//!
+//! # Building directories
+//!
+//! In-memory directories can be composed using the following primitives:
+//!
+//! - [`EmptyEntry`] - has no metadata whatsoever.
+//! - [`BufferedFile`] - root path content is the provided byte vector.
+//! - [`MemDir`] - a [`Dir`] containing a single level of other [`Dir`]s inside.
+//!
+//! Additionally, for interfacing with the OS file system, [`PhysicalDir`] is available,
+//! representing a directory stored on the disk.
+//!
+//! # Virtual paths
+//!
+//! Entries within directories are referenced using [`VPath`]s (**v**irtual **path**s).
+//! A virtual path is composed out of any amount of `/`-separated components.
+//!
+//! There are no special directories like `.` and `..` (those are just normal entries, though using
+//! them is discouraged). [`VPath`]s are always relative to the root of the [`Dir`] you're querying.
+//!
+//! A leading or trailing slash is not allowed, because they would have no meaning.
+//!
+//! [`VPath`] also has an owned version, [`VPathBuf`].
+
+use std::{
+    fmt::{self, Debug},
+    ops::{ControlFlow, Deref},
+    sync::Arc,
+};
+
+mod anchored;
+pub mod asynch;
+mod cd;
+mod content_cache;
+mod content_version_cache;
+mod edit;
+mod empty;
+mod file;
+mod image_size_cache;
+mod mem_dir;
+mod overlay;
+mod path;
+mod physical;
+
+pub use anchored::*;
+pub use cd::*;
+pub use content_cache::*;
+pub use content_version_cache::*;
+pub use edit::*;
+pub use empty::*;
+pub use file::*;
+pub use image_size_cache::*;
+pub use mem_dir::*;
+pub use overlay::*;
+pub use path::*;
+pub use physical::*;
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub struct DirEntry {
+    pub path: VPathBuf,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub struct ImageSize {
+    pub width: u32,
+    pub height: u32,
+}
+
+pub trait Dir: Debug {
+    /// List all entries under the provided path.
+    fn dir(&self, path: &VPath) -> Vec<DirEntry>;
+
+    /// Return the byte content of the entry at the given path.
+    fn content(&self, path: &VPath) -> Option<Vec<u8>>;
+
+    /// Get a string signifying the current version of the provided path's content.
+    /// If the content changes, the version must also change.
+    ///
+    /// Returns None if there is no content or no version string is available.
+    fn content_version(&self, path: &VPath) -> Option<String>;
+
+    /// Returns the size of the image at the given path, or `None` if the entry is not an image
+    /// (or its size cannot be known.)
+    fn image_size(&self, _path: &VPath) -> Option<ImageSize> {
+        None
+    }
+
+    /// Returns a path relative to `config.site` indicating where the file will be available
+    /// once served.
+    ///
+    /// May return `None` if the file is not served.
+    fn anchor(&self, _path: &VPath) -> Option<VPathBuf> {
+        None
+    }
+
+    /// If a file can be written persistently, returns an [`EditPath`] representing the file in
+    /// persistent storage.
+    ///
+    /// An edit path can then be made into an [`Edit`].
+    fn edit_path(&self, _path: &VPath) -> Option<EditPath> {
+        None
+    }
+}
+
+impl<T> Dir for &T
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        (**self).dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        (**self).content(path)
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        (**self).content_version(path)
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        (**self).image_size(path)
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        (**self).anchor(path)
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        (**self).edit_path(path)
+    }
+}
+
+#[derive(Clone)]
+pub struct DynDir {
+    arc: Arc<dyn Dir + Send + Sync>,
+}
+
+impl Dir for DynDir {
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.arc.dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.arc.content(path)
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.arc.content_version(path)
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.arc.image_size(path)
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.arc.anchor(path)
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.arc.edit_path(path)
+    }
+}
+
+impl fmt::Debug for DynDir {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&*self.arc, f)
+    }
+}
+
+impl Deref for DynDir {
+    type Target = dyn Dir + Send + Sync;
+
+    fn deref(&self) -> &Self::Target {
+        &*self.arc
+    }
+}
+
+pub trait ToDynDir {
+    fn to_dyn(self) -> DynDir;
+}
+
+impl<T> ToDynDir for T
+where
+    T: Dir + Send + Sync + 'static,
+{
+    fn to_dyn(self) -> DynDir {
+        DynDir {
+            arc: Arc::new(self),
+        }
+    }
+}
+
+pub trait AnchoredAtExt {
+    fn anchored_at(self, at: VPathBuf) -> Anchored<Self>
+    where
+        Self: Sized;
+}
+
+impl<T> AnchoredAtExt for T
+where
+    T: Dir,
+{
+    fn anchored_at(self, at: VPathBuf) -> Anchored<Self> {
+        Anchored::new(self, at)
+    }
+}
+
+pub fn walk_dir_rec(dir: &dyn Dir, path: &VPath, f: &mut dyn FnMut(&VPath) -> ControlFlow<(), ()>) {
+    for entry in dir.dir(path) {
+        match f(&entry.path) {
+            ControlFlow::Continue(_) => (),
+            ControlFlow::Break(_) => return,
+        }
+        walk_dir_rec(dir, &entry.path, f);
+    }
+}
+
+pub fn url(site: &str, dir: &dyn Dir, path: &VPath) -> Option<String> {
+    let anchor = dir.anchor(path)?;
+    if let Some(version) = dir.content_version(path) {
+        Some(format!("{}/{anchor}?v={version}", site))
+    } else {
+        Some(format!("{}/{anchor}", site))
+    }
+}

crates/treehouse/src/vfs/anchored.rs

@@ -0,0 +1,52 @@
+use std::fmt;
+
+use super::{Dir, DirEntry, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct Anchored<T> {
+    inner: T,
+    at: VPathBuf,
+}
+
+impl<T> Anchored<T> {
+    pub fn new(inner: T, at: VPathBuf) -> Self {
+        Self { inner, at }
+    }
+}
+
+impl<T> Dir for Anchored<T>
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.inner.dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.inner.content(path)
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.inner.content_version(path)
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.inner.image_size(path)
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        Some(self.at.join(path))
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.inner.edit_path(path)
+    }
+}
+
+impl<T> fmt::Debug for Anchored<T>
+where
+    T: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Anchored({:?}, {})", self.inner, self.at)
+    }
+}

crates/treehouse/src/vfs/asynch.rs

@@ -0,0 +1,23 @@
+use super::{Dir, DynDir, VPath};
+
+#[derive(Debug, Clone)]
+pub struct AsyncDir {
+    inner: DynDir,
+}
+
+impl AsyncDir {
+    pub fn new(inner: DynDir) -> Self {
+        Self { inner }
+    }
+
+    pub async fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        let this = self.clone();
+        let path = path.to_owned();
+        // NOTE: Performance impact of spawning a blocking task may be a bit high in case
+        // we add caching.
+        // Measure throughput here.
+        tokio::task::spawn_blocking(move || this.inner.content(&path))
+            .await
+            .unwrap()
+    }
+}

crates/treehouse/src/vfs/cd.rs

@@ -0,0 +1,62 @@
+use std::fmt;
+
+use super::{Dir, DirEntry, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct Cd<T> {
+    parent: T,
+    path: VPathBuf,
+}
+
+impl<T> Cd<T> {
+    pub fn new(parent: T, path: VPathBuf) -> Self {
+        Self { parent, path }
+    }
+}
+
+impl<T> Dir for Cd<T>
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.parent
+            .dir(&self.path.join(path))
+            .into_iter()
+            .map(|entry| DirEntry {
+                path: entry
+                    .path
+                    .strip_prefix(&self.path)
+                    .expect("all entries must be anchored within `self.path`")
+                    .to_owned(),
+            })
+            .collect()
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.parent.content_version(&self.path.join(path))
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.parent.content(&self.path.join(path))
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.parent.image_size(&self.path.join(path))
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.parent.anchor(&self.path.join(path))
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.parent.edit_path(&self.path.join(path))
+    }
+}
+
+impl<T> fmt::Debug for Cd<T>
+where
+    T: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}/{:?}", self.parent, self.path)
+    }
+}

crates/treehouse/src/vfs/content_cache.rs

@@ -0,0 +1,81 @@
+use std::{
+    fmt::{self, Debug},
+    ops::ControlFlow,
+};
+
+use dashmap::DashMap;
+use log::debug;
+use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
+
+use super::{walk_dir_rec, Dir, DirEntry, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct ContentCache<T> {
+    inner: T,
+    cache: DashMap<VPathBuf, Option<Vec<u8>>>,
+}
+
+impl<T> ContentCache<T> {
+    pub fn new(inner: T) -> Self {
+        Self {
+            inner,
+            cache: DashMap::new(),
+        }
+    }
+}
+
+impl<T> ContentCache<T>
+where
+    T: Dir + Send + Sync,
+{
+    pub fn warm_up(&self) {
+        debug!("warm_up({self:?})");
+        let mut paths = vec![];
+        walk_dir_rec(&self.inner, VPath::ROOT, &mut |path| {
+            paths.push(path.to_owned());
+            ControlFlow::Continue(())
+        });
+
+        paths.par_iter().for_each(|path| _ = self.content(path));
+    }
+}
+
+impl<T> Dir for ContentCache<T>
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.inner.dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.cache
+            .entry(path.to_owned())
+            .or_insert_with(|| self.inner.content(path))
+            .clone()
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.inner.content_version(path)
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.inner.image_size(path)
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.inner.anchor(path)
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.inner.edit_path(path)
+    }
+}
+
+impl<T> fmt::Debug for ContentCache<T>
+where
+    T: Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "ContentCache({:?})", self.inner)
+    }
+}

crates/treehouse/src/vfs/content_version_cache.rs

@@ -0,0 +1,65 @@
+use std::fmt::{self, Debug};
+
+use dashmap::DashMap;
+
+use super::{Dir, DirEntry, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct Blake3ContentVersionCache<T> {
+    inner: T,
+    cache: DashMap<VPathBuf, Option<String>>,
+}
+
+impl<T> Blake3ContentVersionCache<T> {
+    pub fn new(inner: T) -> Self {
+        Self {
+            inner,
+            cache: DashMap::new(),
+        }
+    }
+}
+
+impl<T> Dir for Blake3ContentVersionCache<T>
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.inner.dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.inner.content(path)
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.cache
+            .entry(path.to_owned())
+            .or_insert_with(|| {
+                self.content(path).map(|content| {
+                    let hash = blake3::hash(&content).to_hex();
+                    format!("b3-{}", &hash[0..8])
+                })
+            })
+            .clone()
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.inner.image_size(path)
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.inner.anchor(path)
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.inner.edit_path(path)
+    }
+}
+
+impl<T> fmt::Debug for Blake3ContentVersionCache<T>
+where
+    T: Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Blake3ContentVersionCache({:?})", self.inner)
+    }
+}

crates/treehouse/src/vfs/edit.rs

@@ -0,0 +1,92 @@
+use std::{error::Error, fmt, future::Future, path::PathBuf};
+
+use log::{error, info};
+use tokio::task::JoinSet;
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub struct EditPath {
+    pub(super) path: PathBuf,
+}
+
+/// Represents a pending edit operation that can be written to persistent storage later.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Edit {
+    /// An edit that doesn't do anything.
+    NoOp,
+
+    /// Write the given string to a file.
+    Write(EditPath, String),
+
+    /// Execute a sequence of edits in order.
+    Seq(Vec<Edit>),
+    /// Execute the provided edits in parallel.
+    All(Vec<Edit>),
+
+    /// Makes an edit dry.
+    ///
+    /// A dry edit only logs what operations would be performed, does not perform the I/O.
+    Dry(Box<Edit>),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ApplyFailed;
+
+impl Edit {
+    #[expect(clippy::manual_async_fn)]
+    pub fn apply(self) -> impl Future<Output = Result<(), ApplyFailed>> + Send {
+        async {
+            match self {
+                Edit::NoOp => (),
+                Edit::Write(edit_path, content) => {
+                    tokio::fs::write(&edit_path.path, &content)
+                        .await
+                        .inspect_err(|err| error!("write to {edit_path:?} failed: {err:?}"))
+                        .map_err(|_| ApplyFailed)?;
+                }
+                Edit::Seq(vec) => {
+                    for edit in vec {
+                        Box::pin(edit.apply()).await?;
+                    }
+                }
+                Edit::All(vec) => {
+                    let mut set = JoinSet::new();
+                    for edit in vec {
+                        set.spawn(edit.apply());
+                    }
+                    while let Some(result) = set.try_join_next() {
+                        result.map_err(|_| ApplyFailed)??;
+                    }
+                }
+                Edit::Dry(edit) => edit.dry(),
+            }
+
+            Ok(())
+        }
+    }
+
+    pub fn dry(&self) {
+        match self {
+            Edit::NoOp => (),
+            Edit::Write(edit_path, content) => {
+                info!("{edit_path:?}: would write {:?} bytes", content.len());
+            }
+            Edit::Seq(edits) => edits.iter().for_each(Self::dry),
+            Edit::All(edits) => edits.iter().for_each(Self::dry),
+            Edit::Dry(edit) => edit.dry(),
+        }
+    }
+}
+
+impl fmt::Display for ApplyFailed {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("failed to apply some edits")
+    }
+}
+
+impl Error for ApplyFailed {}
+
+impl fmt::Debug for EditPath {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.path, f)
+    }
+}

crates/treehouse/src/vfs/empty.rs

@@ -0,0 +1,18 @@
+use super::{Dir, DirEntry, VPath};
+
+#[derive(Debug)]
+pub struct EmptyEntry;
+
+impl Dir for EmptyEntry {
+    fn dir(&self, _path: &VPath) -> Vec<DirEntry> {
+        vec![]
+    }
+
+    fn content_version(&self, _path: &VPath) -> Option<String> {
+        None
+    }
+
+    fn content(&self, _path: &VPath) -> Option<Vec<u8>> {
+        None
+    }
+}

crates/treehouse/src/vfs/file.rs

@@ -0,0 +1,38 @@
+use std::fmt;
+
+use super::{DirEntry, Dir, VPath};
+
+pub struct BufferedFile {
+    pub content: Vec<u8>,
+}
+
+impl BufferedFile {
+    pub fn new(content: Vec<u8>) -> Self {
+        Self { content }
+    }
+}
+
+impl Dir for BufferedFile {
+    fn dir(&self, _path: &VPath) -> Vec<DirEntry> {
+        vec![]
+    }
+
+    fn content_version(&self, _path: &VPath) -> Option<String> {
+        // TODO: StaticFile should _probably_ calculate a content_version.
+        None
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        if path == VPath::ROOT {
+            Some(self.content.clone())
+        } else {
+            None
+        }
+    }
+}
+
+impl fmt::Debug for BufferedFile {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "BufferedFile")
+    }
+}

crates/treehouse/src/vfs/image_size_cache.rs

@@ -0,0 +1,89 @@
+use std::{fmt, io::Cursor};
+
+use anyhow::Context;
+use dashmap::DashMap;
+use log::{debug, warn};
+
+use crate::config;
+
+use super::{Dir, DirEntry, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct ImageSizeCache<T> {
+    inner: T,
+    cache: DashMap<VPathBuf, Option<ImageSize>>,
+}
+
+impl<T> ImageSizeCache<T> {
+    pub fn new(inner: T) -> Self {
+        Self {
+            inner,
+            cache: DashMap::new(),
+        }
+    }
+}
+
+impl<T> ImageSizeCache<T>
+where
+    T: Dir,
+{
+    fn compute_image_size(&self, path: &VPath) -> anyhow::Result<Option<ImageSize>> {
+        if path.extension().is_some_and(config::is_image_file) {
+            if let Some(content) = self.content(path) {
+                let reader = image::ImageReader::new(Cursor::new(content))
+                    .with_guessed_format()
+                    .context("cannot guess image format")?;
+                let (width, height) = reader.into_dimensions()?;
+                debug!("image_size({path}) = ({width}, {height})");
+                return Ok(Some(ImageSize { width, height }));
+            }
+        }
+
+        Ok(None)
+    }
+}
+
+impl<T> Dir for ImageSizeCache<T>
+where
+    T: Dir,
+{
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        self.inner.dir(path)
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.inner.content(path)
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.inner.content_version(path)
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.cache
+            .entry(path.to_owned())
+            .or_insert_with(|| {
+                self.compute_image_size(path)
+                    .inspect_err(|err| warn!("compute_image_size({path}) failed: {err:?}"))
+                    .ok()
+                    .flatten()
+            })
+            .clone()
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.inner.anchor(path)
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.inner.edit_path(path)
+    }
+}
+
+impl<T> fmt::Debug for ImageSizeCache<T>
+where
+    T: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "ImageSizeCache({:?})", self.inner)
+    }
+}

crates/treehouse/src/vfs/mem_dir.rs

@@ -0,0 +1,151 @@
+use std::{collections::HashMap, fmt};
+
+use super::{Dir, DirEntry, DynDir, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct MemDir {
+    mount_points: HashMap<String, DynDir>,
+}
+
+enum Resolved<'fs, 'path> {
+    Root,
+    MountPoint {
+        fs: &'fs dyn Dir,
+        fs_path: &'path VPath,
+        subpath: &'path VPath,
+    },
+    None,
+}
+
+impl MemDir {
+    pub fn new() -> Self {
+        Self {
+            mount_points: HashMap::new(),
+        }
+    }
+
+    pub fn add(&mut self, path: &VPath, dir: DynDir) {
+        assert_eq!(
+            path.depth(), 0,
+            "path must be situated at root. MountPoints does not support nested paths, but you can nest MountPoints within other MountPoints"
+        );
+
+        assert!(
+            self.mount_points
+                .insert(path.as_str().to_owned(), dir)
+                .is_none(),
+            "duplicate mount point at {path:?}"
+        );
+    }
+
+    fn resolve<'fs, 'path>(&'fs self, path: &'path VPath) -> Resolved<'fs, 'path> {
+        if path == VPath::ROOT {
+            return Resolved::Root;
+        } else {
+            let mount_point_name = path.as_str().split(VPath::SEPARATOR).next().unwrap();
+            if let Some(mount_point) = self.mount_points.get(mount_point_name) {
+                return Resolved::MountPoint {
+                    fs: &**mount_point,
+                    fs_path: VPath::new(mount_point_name),
+                    subpath: path
+                        .strip_prefix(VPath::new(mount_point_name))
+                        .expect("path should have `mount_point_name` as its prefix"),
+                };
+            }
+        }
+
+        Resolved::None
+    }
+}
+
+impl Default for MemDir {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Dir for MemDir {
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        match self.resolve(path) {
+            Resolved::Root => self
+                .mount_points
+                .keys()
+                .map(|name| DirEntry {
+                    path: VPathBuf::new(name),
+                })
+                .collect(),
+            Resolved::MountPoint {
+                fs,
+                fs_path,
+                subpath,
+            } => fs
+                .dir(subpath)
+                .into_iter()
+                .map(|entry| DirEntry {
+                    path: fs_path.join(&entry.path),
+                })
+                .collect(),
+            Resolved::None => vec![],
+        }
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        match self.resolve(path) {
+            Resolved::MountPoint {
+                fs,
+                fs_path: _,
+                subpath,
+            } => fs.content_version(subpath),
+            Resolved::Root | Resolved::None => None,
+        }
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        match self.resolve(path) {
+            Resolved::MountPoint {
+                fs,
+                fs_path: _,
+                subpath,
+            } => fs.content(subpath),
+            Resolved::Root | Resolved::None => None,
+        }
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        match self.resolve(path) {
+            Resolved::MountPoint {
+                fs,
+                fs_path: _,
+                subpath,
+            } => fs.image_size(subpath),
+            Resolved::Root | Resolved::None => None,
+        }
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        match self.resolve(path) {
+            Resolved::MountPoint {
+                fs,
+                fs_path: _,
+                subpath,
+            } => fs.anchor(subpath),
+            Resolved::Root | Resolved::None => None,
+        }
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        match self.resolve(path) {
+            Resolved::MountPoint {
+                fs,
+                fs_path: _,
+                subpath,
+            } => fs.edit_path(subpath),
+            Resolved::Root | Resolved::None => None,
+        }
+    }
+}
+
+impl fmt::Debug for MemDir {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("MountPoints")
+    }
+}

crates/treehouse/src/vfs/overlay.rs

@@ -0,0 +1,58 @@
+use std::fmt;
+
+use super::{Dir, DirEntry, DynDir, EditPath, ImageSize, VPath, VPathBuf};
+
+pub struct Overlay {
+    base: DynDir,
+    overlay: DynDir,
+}
+
+impl Overlay {
+    pub fn new(base: DynDir, overlay: DynDir) -> Self {
+        Self { base, overlay }
+    }
+}
+
+impl Dir for Overlay {
+    fn dir(&self, path: &VPath) -> Vec<DirEntry> {
+        let mut dir = self.base.dir(path);
+        dir.append(&mut self.overlay.dir(path));
+        dir.sort();
+        dir.dedup();
+        dir
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        self.overlay
+            .content(path)
+            .or_else(|| self.base.content(path))
+    }
+
+    fn content_version(&self, path: &VPath) -> Option<String> {
+        self.overlay
+            .content_version(path)
+            .or_else(|| self.base.content_version(path))
+    }
+
+    fn image_size(&self, path: &VPath) -> Option<ImageSize> {
+        self.overlay
+            .image_size(path)
+            .or_else(|| self.base.image_size(path))
+    }
+
+    fn anchor(&self, path: &VPath) -> Option<VPathBuf> {
+        self.overlay.anchor(path).or_else(|| self.base.anchor(path))
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        self.overlay
+            .edit_path(path)
+            .or_else(|| self.base.edit_path(path))
+    }
+}
+
+impl fmt::Debug for Overlay {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Overlay({:?}, {:?})", self.base, self.overlay)
+    }
+}

crates/treehouse/src/vfs/path.rs

@@ -0,0 +1,316 @@
+use std::{borrow::Borrow, error::Error, fmt, ops::Deref, str::FromStr};
+
+use serde::{Deserialize, Serialize};
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct VPath {
+    path: str,
+}
+
+impl VPath {
+    pub const SEPARATOR_BYTE: u8 = b'/';
+    pub const SEPARATOR: char = Self::SEPARATOR_BYTE as char;
+    pub const ROOT: &Self = unsafe { Self::new_unchecked("") };
+
+    pub const fn try_new(s: &str) -> Result<&Self, InvalidPathError> {
+        if s.is_empty() {
+            return Ok(Self::ROOT);
+        }
+
+        let b = s.as_bytes();
+        if b[b.len() - 1] == Self::SEPARATOR_BYTE {
+            return Err(InvalidPathError::TrailingSlash);
+        }
+        if b[0] == Self::SEPARATOR_BYTE {
+            return Err(InvalidPathError::LeadingSlash);
+        }
+
+        Ok(unsafe { Self::new_unchecked(s) })
+    }
+
+    pub fn new(s: &str) -> &Self {
+        Self::try_new(s).expect("invalid path")
+    }
+
+    /// `const` version of [`new`][Self::new]. This has worse error messages, so prefer `new` whenever possible.
+    pub const fn new_const(s: &str) -> &Self {
+        match Self::try_new(s) {
+            Ok(p) => p,
+            Err(_) => panic!("invalid path"),
+        }
+    }
+
+    const unsafe fn new_unchecked(s: &str) -> &Self {
+        std::mem::transmute::<_, &Self>(s)
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.path.is_empty()
+    }
+
+    pub fn is_root(&self) -> bool {
+        self.is_empty()
+    }
+
+    pub fn join(&self, sub: &VPath) -> VPathBuf {
+        let mut buf = self.to_owned();
+        buf.push(sub);
+        buf
+    }
+
+    pub fn parent(&self) -> Option<&VPath> {
+        if self.is_root() {
+            None
+        } else if self.depth() == 0 {
+            Some(VPath::ROOT)
+        } else {
+            let (left, _right) = self
+                .path
+                .split_once(Self::SEPARATOR)
+                .expect("path with depth > 0 must have separators");
+            // SAFETY: We're splitting on a `/`, so there cannot be a trailing `/` in `left`.
+            Some(unsafe { VPath::new_unchecked(left) })
+        }
+    }
+
+    pub fn strip_prefix(&self, prefix: &VPath) -> Option<&Self> {
+        if self == prefix {
+            Some(VPath::ROOT)
+        } else {
+            self.path
+                .strip_prefix(&prefix.path)
+                .and_then(|p| p.strip_prefix(Self::SEPARATOR))
+                // SAFETY: If `self` starts with `prefix`, `p` will end up not being prefixed by `self`
+                // nor a leading slash.
+                .map(|p| unsafe { VPath::new_unchecked(p) })
+        }
+    }
+
+    pub fn depth(&self) -> usize {
+        self.path.chars().filter(|&c| c == Self::SEPARATOR).count()
+    }
+
+    pub fn segments(&self) -> impl Iterator<Item = &Self> {
+        if self.is_root() {
+            None.into_iter().flatten()
+        } else {
+            Some(self.as_str().split(Self::SEPARATOR).map(|s| unsafe {
+                // SAFETY: Since we're splitting on the separator, the path cannot start or end with it.
+                Self::new_unchecked(s)
+            }))
+            .into_iter()
+            .flatten()
+        }
+    }
+
+    pub fn rsegments(&self) -> impl Iterator<Item = &Self> {
+        self.as_str().rsplit(Self::SEPARATOR).map(|s| unsafe {
+            // SAFETY: Since we're splitting on the separator, the path cannot start or end with it.
+            Self::new_unchecked(s)
+        })
+    }
+
+    pub fn file_name(&self) -> Option<&str> {
+        self.rsegments().next().map(Self::as_str)
+    }
+
+    pub fn extension(&self) -> Option<&str> {
+        let file_name = self.file_name()?;
+        let (left, right) = file_name.rsplit_once('.')?;
+        if left.is_empty() {
+            None
+        } else {
+            Some(right)
+        }
+    }
+
+    pub fn with_extension(&self, extension: &str) -> VPathBuf {
+        let mut buf = self.to_owned();
+        buf.set_extension(extension);
+        buf
+    }
+
+    pub fn file_stem(&self) -> Option<&str> {
+        let file_name = self.file_name()?;
+        if let Some(extension) = self.extension() {
+            Some(&file_name[..file_name.len() - extension.len() - 1])
+        } else {
+            Some(file_name)
+        }
+    }
+
+    pub fn as_str(&self) -> &str {
+        &self.path
+    }
+}
+
+impl ToOwned for VPath {
+    type Owned = VPathBuf;
+
+    fn to_owned(&self) -> Self::Owned {
+        VPathBuf::from(self)
+    }
+}
+
+impl fmt::Debug for VPath {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.path)
+    }
+}
+
+impl fmt::Display for VPath {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.path)
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum InvalidPathError {
+    TrailingSlash,
+    LeadingSlash,
+}
+
+impl fmt::Display for InvalidPathError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            InvalidPathError::TrailingSlash => {
+                f.write_str("paths must not end with a trailing `/`")
+            }
+            InvalidPathError::LeadingSlash => {
+                f.write_str("paths are always absolute and must not start with `/`")
+            }
+        }
+    }
+}
+
+impl Error for InvalidPathError {}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct VPathBuf {
+    path: String,
+}
+
+impl VPathBuf {
+    pub fn new(path: impl Into<String>) -> Self {
+        Self::try_new(path).expect("invalid path")
+    }
+
+    pub fn try_new(path: impl Into<String>) -> Result<Self, InvalidPathError> {
+        let path = path.into();
+        match VPath::try_new(&path) {
+            Ok(_) => Ok(Self { path }),
+            Err(e) => Err(e),
+        }
+    }
+
+    unsafe fn new_unchecked(path: String) -> Self {
+        Self { path }
+    }
+
+    pub fn push(&mut self, sub: &VPath) {
+        if !sub.is_empty() {
+            if !self.is_empty() {
+                self.path.push('/');
+            }
+            self.path.push_str(&sub.path);
+        }
+    }
+
+    pub fn set_extension(&mut self, new_extension: &str) {
+        if let Some(existing) = self.extension() {
+            let mut chop_len = existing.len();
+            if new_extension.is_empty() {
+                chop_len += 1; // also chop off the `.`
+            }
+
+            let range = self.path.len() - chop_len..;
+            self.path.replace_range(range, new_extension);
+        } else {
+            self.path.push('.');
+            self.path.push_str(new_extension);
+        }
+    }
+}
+
+impl Default for VPathBuf {
+    fn default() -> Self {
+        VPath::ROOT.to_owned()
+    }
+}
+
+impl Deref for VPathBuf {
+    type Target = VPath;
+
+    fn deref(&self) -> &Self::Target {
+        unsafe { VPath::new_unchecked(&self.path) }
+    }
+}
+
+impl fmt::Debug for VPathBuf {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.path)
+    }
+}
+
+impl fmt::Display for VPathBuf {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.path)
+    }
+}
+
+impl From<&VPath> for VPathBuf {
+    fn from(value: &VPath) -> Self {
+        unsafe { Self::new_unchecked(value.path.to_owned()) }
+    }
+}
+
+impl Borrow<VPath> for VPathBuf {
+    fn borrow(&self) -> &VPath {
+        self
+    }
+}
+
+impl<'de> Deserialize<'de> for VPathBuf {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        use serde::de;
+
+        struct Visitor;
+
+        impl de::Visitor<'_> for Visitor {
+            type Value = VPathBuf;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("virtual path")
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: de::Error,
+            {
+                VPathBuf::try_new(v).map_err(de::Error::custom)
+            }
+        }
+
+        deserializer.deserialize_str(Visitor)
+    }
+}
+
+impl Serialize for VPathBuf {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self.as_str())
+    }
+}
+
+impl FromStr for VPathBuf {
+    type Err = InvalidPathError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Self::try_new(s)
+    }
+}

crates/treehouse/src/vfs/physical.rs

@@ -0,0 +1,81 @@
+use std::path::{Path, PathBuf};
+
+use log::error;
+
+use super::{Dir, DirEntry, EditPath, VPath, VPathBuf};
+
+#[derive(Debug, Clone)]
+pub struct PhysicalDir {
+    root: PathBuf,
+}
+
+impl PhysicalDir {
+    pub fn new(root: PathBuf) -> Self {
+        Self { root }
+    }
+}
+
+impl Dir for PhysicalDir {
+    fn dir(&self, vpath: &VPath) -> Vec<DirEntry> {
+        let physical = self.root.join(physical_path(vpath));
+        if !physical.is_dir() {
+            return vec![];
+        }
+
+        match std::fs::read_dir(physical) {
+            Ok(read_dir) => read_dir
+                .filter_map(|entry| {
+                    entry
+                        .inspect_err(|err| {
+                            error!(
+                                "{self:?} error while reading entries: {err:?}",
+                            )
+                        })
+                        .ok()
+                        .and_then(|entry| {
+                            let path = entry.path();
+                            let path_str = match path.strip_prefix(&self.root).unwrap_or(&path).to_str() {
+                                Some(p) => p,
+                                None => {
+                                    error!("{self:?} entry {path:?} has invalid UTF-8 (while reading vpath {vpath:?})");
+                                    return None;
+                                },
+                            };
+                            let vpath_buf = VPathBuf::try_new(path_str.replace('\\', "/"))
+                                .inspect_err(|err| {
+                                    error!("{self:?} error with vpath for {path_str:?}: {err:?}");
+                                })
+                                .ok()?;
+                            Some(DirEntry { path: vpath_buf })
+                        })
+                })
+                .collect(),
+            Err(err) => {
+                error!(
+                    "{self:?} cannot read vpath {vpath:?}: {err:?}",
+                );
+                vec![]
+            }
+        }
+    }
+
+    fn content_version(&self, _path: &VPath) -> Option<String> {
+        None
+    }
+
+    fn content(&self, path: &VPath) -> Option<Vec<u8>> {
+        std::fs::read(self.root.join(physical_path(path)))
+            .inspect_err(|err| error!("{self:?} cannot read file at vpath {path:?}: {err:?}",))
+            .ok()
+    }
+
+    fn edit_path(&self, path: &VPath) -> Option<EditPath> {
+        Some(EditPath {
+            path: self.root.join(physical_path(path)),
+        })
+    }
+}
+
+fn physical_path(path: &VPath) -> &Path {
+    Path::new(path.as_str())
+}

crates/treehouse/tests/it/main.rs

@@ -0,0 +1 @@
+mod vfs;

crates/treehouse/tests/it/vfs.rs

@@ -0,0 +1,5 @@
+mod cd;
+mod empty;
+mod file;
+mod mount_points;
+mod physical;

crates/treehouse/tests/it/vfs/cd.rs

@@ -0,0 +1,83 @@
+use treehouse::vfs::{BufferedFile, Cd, Dir, DirEntry, MemDir, ToDynDir, VPath, VPathBuf};
+
+const HEWWO: &[u8] = b"hewwo :3";
+const FWOOFEE: &[u8] = b"fwoofee -w-";
+const BOOP: &[u8] = b"boop >w<";
+
+fn vfs() -> MemDir {
+    let file1 = BufferedFile::new(HEWWO.to_vec());
+    let file2 = BufferedFile::new(FWOOFEE.to_vec());
+    let file3 = BufferedFile::new(BOOP.to_vec());
+
+    let mut innermost = MemDir::new();
+    innermost.add(VPath::new("file3.txt"), file3.to_dyn());
+
+    let mut inner = MemDir::new();
+    inner.add(VPath::new("file1.txt"), file1.to_dyn());
+    inner.add(VPath::new("file2.txt"), file2.to_dyn());
+    inner.add(VPath::new("innermost"), innermost.to_dyn());
+
+    let mut vfs = MemDir::new();
+    vfs.add(VPath::new("inner"), inner.to_dyn());
+    vfs
+}
+
+#[test]
+fn dir1() {
+    let outer = vfs();
+    let inner = Cd::new(outer, VPathBuf::new("inner"));
+
+    let mut dir = inner.dir(VPath::ROOT);
+    dir.sort();
+    assert_eq!(
+        dir,
+        vec![
+            DirEntry {
+                path: VPathBuf::new("file1.txt"),
+            },
+            DirEntry {
+                path: VPathBuf::new("file2.txt"),
+            },
+            DirEntry {
+                path: VPathBuf::new("innermost"),
+            }
+        ]
+    );
+}
+
+#[test]
+fn dir2() {
+    let outer = vfs();
+    let innermost = Cd::new(&outer, VPathBuf::new("inner/innermost"));
+
+    let mut dir = innermost.dir(VPath::ROOT);
+    dir.sort();
+    assert_eq!(
+        dir,
+        vec![DirEntry {
+            path: VPathBuf::new("file3.txt"),
+        },]
+    );
+}
+
+#[test]
+fn content_version() {
+    let outer = vfs();
+    let inner = Cd::new(&outer, VPathBuf::new("inner"));
+
+    assert_eq!(
+        inner.content_version(VPath::new("test1.txt")),
+        outer.content_version(VPath::new("inner/test1.txt"))
+    );
+}
+
+#[test]
+fn content() {
+    let outer = vfs();
+    let inner = Cd::new(&outer, VPathBuf::new("inner"));
+
+    assert_eq!(
+        inner.content(VPath::new("test1.txt")),
+        outer.content(VPath::new("inner/test1.txt"))
+    );
+}

crates/treehouse/tests/it/vfs/empty.rs

@@ -0,0 +1,16 @@
+use treehouse::vfs::{Dir, EmptyEntry, VPath};
+
+#[test]
+fn dir() {
+    assert!(EmptyEntry.dir(VPath::ROOT).is_empty());
+}
+
+#[test]
+fn content_version() {
+    assert!(EmptyEntry.content_version(VPath::ROOT).is_none());
+}
+
+#[test]
+fn content() {
+    assert!(EmptyEntry.content(VPath::ROOT).is_none());
+}

crates/treehouse/tests/it/vfs/file.rs

@@ -0,0 +1,29 @@
+use treehouse::vfs::{BufferedFile, Dir, VPath};
+
+fn vfs() -> BufferedFile {
+    BufferedFile::new(b"hewwo :3".to_vec())
+}
+
+#[test]
+fn dir() {
+    let vfs = vfs();
+    assert!(vfs.dir(VPath::ROOT).is_empty());
+}
+
+#[test]
+fn content_version() {
+    let vfs = vfs();
+    assert!(
+        vfs.content_version(VPath::ROOT).is_none(),
+        "content_version is not implemented for BufferedFile for now"
+    );
+}
+
+#[test]
+fn content() {
+    let vfs = vfs();
+    assert_eq!(
+        vfs.content(VPath::ROOT).as_deref(),
+        Some(b"hewwo :3".as_slice()),
+    );
+}

crates/treehouse/tests/it/vfs/mount_points.rs

@@ -0,0 +1,88 @@
+use treehouse::vfs::{BufferedFile, Dir, DirEntry, MemDir, ToDynDir, VPath, VPathBuf};
+
+const HEWWO: &[u8] = b"hewwo :3";
+const FWOOFEE: &[u8] = b"fwoofee -w-";
+const BOOP: &[u8] = b"boop >w<";
+
+fn vfs() -> MemDir {
+    let file1 = BufferedFile::new(HEWWO.to_vec());
+    let file2 = BufferedFile::new(FWOOFEE.to_vec());
+    let file3 = BufferedFile::new(BOOP.to_vec());
+
+    let mut inner = MemDir::new();
+    inner.add(VPath::new("file3.txt"), file3.to_dyn());
+
+    let mut vfs = MemDir::new();
+    vfs.add(VPath::new("file1.txt"), file1.to_dyn());
+    vfs.add(VPath::new("file2.txt"), file2.to_dyn());
+    vfs.add(VPath::new("inner"), inner.to_dyn());
+    vfs
+}
+
+#[test]
+fn dir() {
+    let vfs = vfs();
+
+    let mut dir = vfs.dir(VPath::new(""));
+    dir.sort();
+    assert_eq!(
+        dir,
+        vec![
+            DirEntry {
+                path: VPathBuf::new("file1.txt"),
+            },
+            DirEntry {
+                path: VPathBuf::new("file2.txt"),
+            },
+            DirEntry {
+                path: VPathBuf::new("inner"),
+            }
+        ]
+    );
+
+    assert!(vfs.dir(VPath::new("file1.txt")).is_empty());
+    assert!(vfs.dir(VPath::new("file2.txt")).is_empty());
+    assert_eq!(
+        vfs.dir(VPath::new("inner")),
+        vec![DirEntry {
+            path: VPathBuf::new("inner/file3.txt")
+        }]
+    );
+}
+
+#[test]
+fn content_version() {
+    let vfs = vfs();
+
+    let file1 = BufferedFile::new(HEWWO.to_vec());
+    let file2 = BufferedFile::new(FWOOFEE.to_vec());
+    let file3 = BufferedFile::new(BOOP.to_vec());
+
+    assert_eq!(
+        vfs.content_version(VPath::new("file1.txt")),
+        file1.content_version(VPath::ROOT)
+    );
+    assert_eq!(
+        vfs.content_version(VPath::new("file2.txt")),
+        file2.content_version(VPath::ROOT)
+    );
+    assert_eq!(
+        vfs.content_version(VPath::new("inner/file3.txt")),
+        file3.content_version(VPath::ROOT)
+    );
+}
+
+#[test]
+fn content() {
+    let vfs = vfs();
+
+    assert_eq!(vfs.content(VPath::new("file1.txt")).as_deref(), Some(HEWWO));
+    assert_eq!(
+        vfs.content(VPath::new("file2.txt")).as_deref(),
+        Some(FWOOFEE)
+    );
+    assert_eq!(
+        vfs.content(VPath::new("inner/file3.txt")).as_deref(),
+        Some(BOOP)
+    );
+}

crates/treehouse/tests/it/vfs/physical.rs

@@ -0,0 +1,37 @@
+use std::path::Path;
+
+use treehouse::vfs::{DirEntry, PhysicalDir, Dir, VPath, VPathBuf};
+
+fn vfs() -> PhysicalDir {
+    let root = Path::new("tests/it/vfs_physical").to_path_buf();
+    PhysicalDir::new(root)
+}
+
+#[test]
+fn dir() {
+    let vfs = vfs();
+    let dir = vfs.dir(VPath::ROOT);
+    assert_eq!(
+        &dir[..],
+        &[DirEntry {
+            path: VPathBuf::new("test.txt"),
+        }]
+    );
+}
+
+#[test]
+fn content_version() {
+    let vfs = vfs();
+    let content_version = vfs.content_version(VPath::new("test.txt"));
+    assert_eq!(
+        content_version, None,
+        "content_version remains unimplemented for now"
+    );
+}
+
+#[test]
+fn content() {
+    let vfs = vfs();
+    let content = vfs.content(VPath::new("test.txt"));
+    assert_eq!(content.as_deref(), Some(b"hewwo :3\n".as_slice()));
+}

crates/treehouse/tests/it/vfs_physical/test.txt

@@ -0,0 +1 @@
+hewwo :3

static/css/main.css

@@ -117,12 +117,12 @@ body {
        Other assets are referenced rarely enough that caching probably isn't gonna make too much of
        an impact.
        It's unlikely I'll ever update the font anyways, so eh, whatever. */
-    src: url("../font/Recursive_VF_1.085.woff2?cache=b3-445487d5");
+    src: url("../font/Recursive_VF_1.085.woff2?v=b3-445487d5");
 }
 
 @font-face {
     font-family: "RecVarMono";
-    src: url("../font/Recursive_VF_1.085.woff2?cache=b3-445487d5");
+    src: url("../font/Recursive_VF_1.085.woff2?v=b3-445487d5");
     font-variation-settings: "MONO" 1;
 }
 

static/js/live-reload.js

@@ -0,0 +1,16 @@
+// NOTE: The server never fulfills this request, it stalls forever.
+// Once the connection is closed, we try to connect with the server until we establish a successful
+// connection. Then we reload the page.
+await fetch("/dev/live-reload/stall").catch(async () => {
+    while (true) {
+        try {
+            let response = await fetch("/dev/live-reload/back-up");
+            if (response.status == 200) {
+                window.location.reload();
+                break;
+            }
+        } catch (e) {
+            await new Promise((resolve) => setTimeout(resolve, 100));
+        }
+    }
+});

static/js/tree.js

@@ -104,9 +104,7 @@ class LinkedBranch extends Branch {
 
     async loadTreePromise(_initiator) {
         try {
-            let response = await fetch(
+            let response = await fetch(`${TREEHOUSE_SITE}/${this.linkedTree}`);
-                `${TREEHOUSE_SITE}/${this.linkedTree}.html`
-            );
             if (response.status == 404) {
                 throw `Hmm, seems like the tree "${this.linkedTree}" does not exist.`;
             }
@@ -127,7 +125,9 @@ class LinkedBranch extends Branch {
                 // No need to await for the import because we don't use the resulting module.
                 // Just fire and forger 💀
                 // and let them run in parallel.
-                let url = URL.createObjectURL(new Blob([script.textContent], { type: "text/javascript" }))
+                let url = URL.createObjectURL(
+                    new Blob([script.textContent], { type: "text/javascript" }),
+                );
                 import(url);
             }
         } catch (error) {
@@ -257,10 +257,7 @@ async function expandLinkedBranch() {
     let currentlyHighlightedBranch = getCurrentlyHighlightedBranch();
     if (currentlyHighlightedBranch.length > 0) {
         let linkedBranch = document.getElementById(currentlyHighlightedBranch);
-        if (
+        if (linkedBranch.children.length > 0 && linkedBranch.children[0].tagName == "DETAILS") {
-            linkedBranch.children.length > 0 &&
-            linkedBranch.children[0].tagName == "DETAILS"
-        ) {
             expandDetailsRecursively(linkedBranch.children[0]);
         }
     }

template/components/_head.hbs

@@ -11,10 +11,17 @@
 <link rel="stylesheet" href="{{ asset 'css/icons.css' }}">
 <link rel="stylesheet" href="{{ asset 'css/tree.css' }}">
 
-{{!-- Import maps currently don't support the src="" attribute. Unless we come up with something
+{{!--
-clever to do while browser vendors figure that out, we'll just have to do a cache-busting include_static. --}}
+Import maps currently don't support the src="" attribute. Unless we come up with something
-{{!-- <script type="importmap" src="{{ asset 'generated/import-map.json' }}"></script> --}}
+clever to do while browser vendors figure that out, we'll just have to do a cache-busting string substitution.
-<script type="importmap">{{{ include_static 'generated/import-map.json' }}}</script>
+--}}
+<script type="importmap">{{{ import_map }}}</script>
+
+{{#if dev}}
+<script type="module">
+    import "treehouse/live-reload.js";
+</script>
+{{/if}}
 
 <script>
     const TREEHOUSE_SITE = `{{ config.site }}`;

template/sandbox.hbs

@@ -3,6 +3,8 @@
 <html>
 
 <head>
+    <meta charset="UTF-8">
+    
     <title>treehouse iframe sandbox</title>
 
     <link rel="stylesheet" href="{{ asset 'css/base.css' }}">
@@ -21,7 +23,7 @@
         }
     </style>
 
-    <script type="importmap">{{{ include_static 'generated/import-map.json' }}}</script>
+    <script type="importmap">{{{ import_map }}}</script>
 
     <script type="module">
         import { evaluate, domConsole, jsConsole } from "treehouse/components/literate-programming/eval.js";

treehouse.toml

@@ -5,9 +5,6 @@
 # This variable can also be set using the TREEHOUSE_SITE environment variable.
 site = ""
 
-# TODO djot: Remove once transition is over.
-markup = "Djot"
-
 # This is used to generate a link in the footer that links to the page's source commit.
 # The final URL is `{commit_base_url}/{commit}/content/{tree_path}.tree`.
 commit_base_url = "https://src.liquidev.net/liquidex/treehouse/src/commit"
@@ -60,7 +57,7 @@ description = "a place on the Internet I like to call home"
 
 [build.javascript]
 import_roots = [
-    { name = "treehouse", path = "static/js" },
+    { name = "treehouse", path = "" },
-    { name = "tairu", path = "static/js/components/tairu" },
+    { name = "tairu", path = "components/tairu" },
-    { name = "haku", path = "static/js/components/haku" },
+    { name = "haku", path = "components/haku" },
 ]