rework branches a bit to support saving

content/2023-08-20-under-construction.tree

@@ -1 +1 @@
-- section under construction. sorry! in the meantime, maybe you wanna read [my ramblings about the treehouse](#01H89RFHCQCD3E1XS5XAPW86J5)?
+- section under construction. sorry! in the meantime, maybe you wanna read [my ramblings about the treehouse][b:01H89RFHCQCD3E1XS5XAPW86J5]?

content/about-treehouse.tree

@@ -136,8 +136,10 @@
     % id = "01H89RFHCQ2GWJPTAKTRGS1QAC"
     - weird poems and philosophical talk are over, it's time to focus on the tech.
 
+        - call this an overview, Defense of Design, or what have you
+
     % id = "01H89RFHCQF4N9T05B9DVWX67K"
-    - treehouse is built in the programming language that gives me the most pleasure while developing.
+    - treehouse is built in the programming language that gives me the most pleasure coding.
 
         - no need for you to know more. :shhh:
 
@@ -149,10 +151,10 @@
         - but being the altruist I am - don't worry, it _will_ be open source one day.
 
             - in case you're reading this in the far future, and this is still here…
-              you wouldn't mind [dropping me a line](#01H89P3CH8CD28KGX9GVRFK60E) would you?
+              you wouldn't mind [dropping me a line][b:01H89P3CH8CD28KGX9GVRFK60E] would you?
 
     % id = "01H89RFHCQAQVXP6B2H0T8NNDS"
-    - personally… the language you build a personal project in almost never matters. it's rather how you execute your ideas.
+    - personally… the language you build a personal project with almost never matters. it's rather how you execute your ideas.
 
         + therefore I find boasting that my project is powered by a `$LANGUAGE` or a `$FRAMEWORK` unnecessary.
 
@@ -162,7 +164,7 @@
                 - (yes, I know that website is super old, but I still find it incredibly funny :hueh:)
 
     % id = "01H89RFHCQFWC2FWBAE9PVNC08"
-    - as I alluded to [here](#01H89RFHCQ3EAP0F6PRSEK7S1T), treehouse is built to decay gracefully
+    - as I alluded to [here][b:01H89RFHCQ3EAP0F6PRSEK7S1T], treehouse is built to decay gracefully
       as you take away the fancy parts.
 
         - you will be able to read it just fine without JavaScript, just that it'll be a little
@@ -185,6 +187,14 @@
 
                     - if you have accessibility concerns about this decision, please let me know.
 
+            - it also saves your progress as you read. if you refresh the page, you'll notice you end up exactly where you left off!
+
+            - but, there is one very crucial piece of JavaScript that makes this website tick, and your experience **will be degraded** if you disable it. that feature is linking to branches.
+
+                - by default, if you link to an element by its id and it's contained within a `<details>`, the `<details>` will not expand. :ralsei_dead:
+
+                - therefore there's a bit of JS to make that work, _and_ to tie that together with lazy loading.
+
         - treehouse will not work *as* fine without CSS though - the `<details>` will look extremely
           janky, but the content should still be fully readable.
 
@@ -193,7 +203,8 @@
         - the structure of `.tree` files is extremely minimal. there are only a few syntactic features to speak of.
 
         - here's a taste of `.tree`:
-        ```
+
+            - ```
             \% id = "root"
             \- this is a branch
 
@@ -219,15 +230,15 @@
 
             - …may or may not be expanded by default (this is the branch's _kind_) - that's what the minus `-` and plus `+` tokens do
 
-            - …are sequenced like: optional attributes, kind, content
+        - each branch is constructed in this order: optional attributes, kind, content
 
-            - …end when another line beginning with `%`, `-`, or `+` is found.
+        - and ends when another line beginning with `%`, `-`, or `+` is found.
 
         - other than that, `.tree` assumes nothing about what format the branch attributes or content are encoded in.
 
             - I chose TOML and Markdown for their ease of use and flexibility, but the parser couldn't care less.
 
-                - …actually, that's a lie. see that code example above? Markdown code fences \`\`\` are handled specially to let you do that kind of stuff. that's all.
+                - …actually, that's a lie. see that code example above? Markdown code fences \`\`\` are handled specially to let embed `.tree` source code blocks within `.tree` files. that's all.
 
     - you may have noticed in that code example above that almost every branch has an `id` attribute.
 
@@ -261,6 +272,16 @@
 
                         - which is cool because it's much denser while avoiding ambiguous characters - `0`, `O`, and `o` are all interpreted as `0` (zero).
 
+    - noticed how fast the treehouse restores your state? there's basically no delay.
+
+        - this is because it restores your state _as it's loading in_, by using [Web Components](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements).
+
+            - despite many people calling that API extremely low-level, I beg to differ. it's actually pretty easy and pleasant to use.
+
+            - most importantly it lets me enhance vanilla `<li>` elements with custom behavior executed on load, which I use to restore your reading progress as the page is loading in.
+
+        - linked branches also use Web Components by the way.
+
     - while not strictly a technical topic, I'd like to shout out [Recursive](https://recursive.design) for being an awesome font :ralsei_love:
 
         - (not to be confused with Font Awesome, which I do not use here. icon designs are my own.)

content/about.tree

@@ -97,10 +97,10 @@
                 - [DELTARUNE](https://deltarune.com)
 
                 % id = "01H89P3CH89TQ3SFG2Z40J29HX"
-                - they're pretty great you should check them out (also check out [my games corner][page:/games]? :pleading_face:)
+                - they're pretty great you should check them out (also check out [my games corner][page:games]? :pleading_face:)
 
         % id = "01H89P3CH8AJATQ5DJBBFXJ1NH"
-        - or [music][page:/music]
+        - or [music][page:music]
 
             % id = "01H89P3CH8XQ59YZD3RFRYQ2BM"
             - various genres from electronic through jazz and even rock
@@ -153,7 +153,7 @@
         - anyways you can find me on
 
             % id = "01H89P3CH8EMM31JEMJRVRAKF4"
-            + Discord - username is [this](#01H89P3CH8GAHS8DDW1HHEWA3P)
+            + Discord - username is [this][b:01H89P3CH8GAHS8DDW1HHEWA3P]
 
                 % id = "01H89P3CH89HHDVHGB9GE287TR"
                 - I'm most active there so you'll have the best chance of getting a reply
@@ -162,7 +162,7 @@
                 - you'll know it's me if you see a profile with a fluffy boy avatar
 
             % id = "01H89P3CH8WTBKXP0GGN0HYQK2"
-            + Matrix - username is [this](#01H89P3CH8943QGT52K7MRW12Q) at gacko.pl
+            + Matrix - username is [this][b:01H89P3CH8943QGT52K7MRW12Q] at gacko.pl
 
                 % id = "01H89P3CH832E4GK0NJ77KED06"
                 - I try to be as active there as on Discord but my availability may be a little more

content/index.tree

@@ -3,11 +3,11 @@
 
     - welcome! make yourself at home
 
-        - this is my treehouse, the place on the Internet I like to call home.
+    ---
 
     % id = "about"
       content.link = "about"
-    + ## about yourself
+    + ## about me
 
     % id = "about-treehouse"
       content.link = "about-treehouse"

crates/treehouse/src/html/tree.rs

@@ -31,17 +31,21 @@ pub fn branch_to_html(s: &mut String, treehouse: &mut Treehouse, file_id: FileId
     );
 
     let class = if has_children { "branch" } else { "leaf" };
+    let component = if let Content::Link(_) = attributes.content {
+        "th-b-linked"
+    } else {
+        "th-b"
+    };
+
     let linked_branch = if let Content::Link(link) = &attributes.content {
-        format!(
+        format!(" data-th-link=\"{}\"", EscapeHtml(link))
-            " is=\"th-linked-branch\" data-th-link=\"{}\"",
-            EscapeHtml(link)
-        )
     } else {
         String::new()
     };
+
     write!(
         s,
-        "<li class=\"{class}\" id=\"{}\"{linked_branch}>",
+        "<li is=\"{component}\" class=\"{class}\" id=\"{}\"{linked_branch}>",
         EscapeAttribute(&id)
     )
     .unwrap();

crates/treehouse/src/state.rs

@@ -6,7 +6,6 @@ use codespan_reporting::{
     files::SimpleFiles,
     term::termcolor::{ColorChoice, StandardStream},
 };
-use log::debug;
 use ulid::Ulid;
 
 pub type Files = SimpleFiles<String, String>;

static/js/tree.js

@@ -1,13 +1,41 @@
-class LinkedBranch extends HTMLLIElement {
+const branchStateKey = "treehouse.openBranches";
+let branchState = JSON.parse(localStorage.getItem(branchStateKey)) || {};
+
+function saveBranchIsOpen(branchID, state) {
+    branchState[branchID] = state;
+    localStorage.setItem(branchStateKey, JSON.stringify(branchState));
+}
+
+function branchIsOpen(branchID) {
+    return branchState[branchID];
+}
+
+class Branch extends HTMLLIElement {
+    constructor() {
+        super();
+
+        this.details = this.childNodes[0];
+        this.innerUL = this.details.childNodes[1];
+
+        let isOpen = branchIsOpen(this.id);
+        if (isOpen !== undefined) {
+            this.details.open = isOpen;
+        }
+        this.details.addEventListener("toggle", _ => {
+            saveBranchIsOpen(this.id, this.details.open);
+        });
+    }
+}
+
+customElements.define("th-b", Branch, { extends: "li" });
+
+class LinkedBranch extends Branch {
     constructor() {
         super();
 
         this.linkedTree = this.getAttribute("data-th-link");
 
-        this.details = this.childNodes[0];
+        this.loadingState = "notloaded";
-        this.innerUL = this.details.childNodes[1];
-
-        this.state = "notloaded";
 
         this.loadingText = document.createElement("p");
         {
@@ -19,12 +47,13 @@ class LinkedBranch extends HTMLLIElement {
         this.innerUL.appendChild(this.loadingText);
 
         // This produces a warning during static generation but we still want to handle that
-        // correctly. Having an expanded-by-default linked block can be useful in development.
+        // correctly, as Branch saves the state in localStorage. Having an expanded-by-default
+        // linked block can be useful in development.
         if (this.details.open) {
             this.loadTree();
         }
 
-        this.details.addEventListener("toggle", event => {
+        this.details.addEventListener("toggle", _ => {
             if (this.details.open) {
                 this.loadTree();
             }
@@ -32,8 +61,8 @@ class LinkedBranch extends HTMLLIElement {
     }
 
     loadTree() {
-        if (this.state == "notloaded") {
+        if (this.loadingState == "notloaded") {
-            this.state = "loading";
+            this.loadingState = "loading";
 
             fetch(`/${this.linkedTree}.html`)
                 .then(response => {
@@ -46,26 +75,22 @@ class LinkedBranch extends HTMLLIElement {
                     let parser = new DOMParser();
                     let linkedDocument = parser.parseFromString(text, "text/html");
                     let main = linkedDocument.getElementsByTagName("main")[0];
-                    let ul /*: Element */ = main.getElementsByTagName("ul")[0];
+                    let ul = main.getElementsByTagName("ul")[0];
-                    console.log(ul);
 
                     this.loadingText.remove();
+                    this.innerUL.innerHTML = ul.innerHTML;
 
-                    for (let i = 0; i < ul.childNodes.length; ++i) {
+                    this.loadingState = "loaded";
-                        this.innerUL.appendChild(ul.childNodes[i]);
-                    }
-
-                    this.state = "loaded";
                 })
                 .catch(error => {
                     this.loadingText.innerText = error.toString();
-                    this.state = "error";
+                    this.loadingState = "error";
                 });
         }
     }
 }
 
-customElements.define("th-linked-branch", LinkedBranch, { extends: "li" });
+customElements.define("th-b-linked", LinkedBranch, { extends: "li" });
 
 function expandDetailsRecursively(element) {
     while (element && element.tagName != "MAIN") {

template/tree.hbs

@@ -33,18 +33,9 @@
                     miners.</strong><br>
                 if you don't believe me, you're free to inspect the source yourself! all the scripts are written
                 lovingly in vanilla JS (not minified!) by yours truly ❤️</p>
-            <small>and if this box is annoying, feel free to zap it with uBlock Origin or something. I have no
+            <small>and if this box is annoying, feel free to block it with uBlock Origin or something. I have no
                 way of remembering you closed it, and don't wanna host this site on a dynamic server.</small>
-
+        </div>
-            {{!-- <form method="dialog">
-                <button name="th-noscript-close" class="noscript-close">I understand and wish to proceed without
-                    JavaScript. And don't nag me about it anymore.<br>
-                    I consent to you storing a cookie on my device to remember this decision.</button>
-            </form>
-            --}}
-            {{!-- I disabled the button because I can't figure out a way to do this without storing a cookie, and I
-            don't like those. I'd prefer if this website were fully static. --}}
-            </dialog>
     </noscript>
 
     <main class="tree">