implement brush cost gauges

they're a little ugly at the moment, and can be a little useless for most simple brushes, but whatever we'll make them better later

crates/haku-wasm/src/lib.rs

@@ -279,11 +279,24 @@ extern "C" fn haku_status_string(code: StatusCode) -> *const i8 {
     .as_ptr()
 }
 
+#[derive(Debug)]
+struct CompileStats {
+    ast_size: usize,
+}
+
+#[derive(Debug)]
+struct RunnableBrush {
+    chunk_id: ChunkId,
+    closure_spec: ClosureSpec,
+
+    compile_stats: CompileStats,
+}
+
 #[derive(Debug, Default)]
 enum BrushState {
     #[default]
     Default,
-    Ready(ChunkId, ClosureSpec),
+    Ready(RunnableBrush),
 }
 
 #[derive(Debug, Default)]
@@ -431,7 +444,13 @@ unsafe extern "C" fn haku_compile_brush(
         Ok(chunk_id) => chunk_id,
         Err(_) => return StatusCode::TooManyChunks,
     };
-    brush.state = BrushState::Ready(chunk_id, closure_spec);
+    brush.state = BrushState::Ready(RunnableBrush {
+        chunk_id,
+        closure_spec,
+        compile_stats: CompileStats {
+            ast_size: ast.len(),
+        },
+    });
 
     info!("brush compiled into {chunk_id:?}");
 
@@ -470,7 +489,7 @@ unsafe extern "C" fn haku_begin_brush(instance: *mut Instance, brush: *const Bru
     let instance = &mut *instance;
     let brush = &*brush;
 
-    let BrushState::Ready(chunk_id, closure_spec) = brush.state else {
+    let BrushState::Ready(runnable) = &brush.state else {
         panic!("brush is not compiled and ready to be used");
     };
 
@@ -479,10 +498,10 @@ unsafe extern "C" fn haku_begin_brush(instance: *mut Instance, brush: *const Bru
     instance.reset_exception();
     instance.trampoline = None;
 
-    let Ok(closure_id) = instance
+    let Ok(closure_id) = instance.vm.create_ref(Ref::Closure(Closure::chunk(
-        .vm
+        runnable.chunk_id,
-        .create_ref(Ref::Closure(Closure::chunk(chunk_id, closure_spec)))
+        runnable.closure_spec,
-    else {
+    ))) else {
         return StatusCode::OutOfRefSlots;
     };
 
@@ -574,3 +593,26 @@ unsafe extern "C" fn haku_cont_dotter(
         )
     })
 }
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_ast_size(brush: *const Brush) -> usize {
+    match &(*brush).state {
+        BrushState::Default => 0,
+        BrushState::Ready(runnable) => runnable.compile_stats.ast_size,
+    }
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_num_refs(instance: *const Instance) -> usize {
+    (*instance).vm.num_refs()
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_remaining_fuel(instance: *const Instance) -> usize {
+    (*instance).vm.remaining_fuel()
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_remaining_memory(instance: *const Instance) -> usize {
+    (*instance).vm.remaining_memory()
+}

crates/haku/src/vm.rs

@@ -73,10 +73,18 @@ impl Vm {
         }
     }
 
+    pub fn num_refs(&self) -> usize {
+        self.refs.len()
+    }
+
     pub fn remaining_fuel(&self) -> usize {
         self.fuel
     }
 
+    pub fn remaining_memory(&self) -> usize {
+        self.memory
+    }
+
     pub fn set_fuel(&mut self, fuel: usize) {
         self.fuel = fuel;
     }

scripts/mkicon.fish

@@ -1,7 +1,13 @@
 #!/usr/bin/env fish
 
-set filename $argv[1]
+function mkicon
-set icon_name (basename $filename .svg)
+    set -l filename $argv[1]
-set icon_base64 (svgcleaner --stdout $filename 2>/dev/null | base64 -w0)
+    set -l icon_name (basename $filename .svg)
+    set -l icon_base64 (svgcleaner --stdout $filename 2>/dev/null | base64 -w0)
 
-printf "--icon-%s: url('data:image/svg+xml;base64,%s');" "$icon_name" "$icon_base64"
+    printf "--icon-%s: url('data:image/svg+xml;base64,%s');\n" "$icon_name" "$icon_base64"
+end
+
+for arg in $argv
+    mkicon $arg
+end

static/base.css

@@ -166,12 +166,20 @@ pre:has(code) {
 /* Icons */
 
 :root {
-    --icon-rkgk-grayscale: url("data:image/svg+xml;base64,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");
+    --icon-brackets: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNyA0aC0zdjhoM20yLThoM3Y4aC0zIiBzdHJva2U9IiMwMDAiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-droplet: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNSAxMGMwLTEuNjM0NzIgMS4wMDIxMi00LjI3MTU2IDIuMTg3MjYtNi41NDUzNy4zNDg5My0uNjY5NDQgMS4yNzY1NS0uNjY5NDQgMS42MjU0OCAwIDEuMTg1MTQgMi4yNzM4MSAyLjE4NzI2IDQuOTEwNjUgMi4xODcyNiA2LjU0NTM3IDAgMi0xLjUgMy0zIDNzLTMtMS0zLTN6IiBmaWxsPSIjMDAwIi8+PC9zdmc+");
     --icon-external-link: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48ZyBzdHJva2U9IiMwMDAiPjxwYXRoIGQ9Im0xMC41IDl2Mi41aC02di02aDIuNSIvPjxwYXRoIGQ9Im03IDkgNC41LTQuNW0wIDBoLTMuNW0zLjUgMHYzLjUiLz48L2c+PC9zdmc+");
+    --icon-memory: url("data:image/svg+xml;base64,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");
+    --icon-object: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBjbGlwLXJ1bGU9ImV2ZW5vZGQiIGQ9Im0xMiA2YzAgMS4xMDQ1Ny0uODk1NCAyLTIgMnYyYzIuMjA5MSAwIDQtMS43OTA4NiA0LTRzLTEuNzkwOS00LTQtNGMtMi4yMDkxNCAwLTQgMS43OTA4Ni00IDRoMmMwLTEuMTA0NTcuODk1NDMtMiAyLTIgMS4xMDQ2IDAgMiAuODk1NDMgMiAyeiIgZmlsbD0iIzAwMCIgZmlsbC1ydWxlPSJldmVub2RkIi8+PHBhdGggZD0ibTMgN2g2djZoLTZ6IiBzdHJva2U9IiMwMDAiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-rkgk-grayscale: url("data:image/svg+xml;base64,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");
+
+    --icon-brackets-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNyA0aC0zdjhoM20yLThoM3Y4aC0zIiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-droplet-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNSAxMGMwLTEuNjM0NzIgMS4wMDIxMi00LjI3MTU2IDIuMTg3MjYtNi41NDUzNy4zNDg5My0uNjY5NDQgMS4yNzY1NS0uNjY5NDQgMS42MjU0OCAwIDEuMTg1MTQgMi4yNzM4MSAyLjE4NzI2IDQuOTEwNjUgMi4xODcyNiA2LjU0NTM3IDAgMi0xLjUgMy0zIDNzLTMtMS0zLTN6IiBmaWxsPSIjZmZmIi8+PC9zdmc+");
+    --icon-object-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBjbGlwLXJ1bGU9ImV2ZW5vZGQiIGQ9Im0xMiA2YzAgMS4xMDQ1Ny0uODk1NCAyLTIgMnYyYzIuMjA5MSAwIDQtMS43OTA4NiA0LTRzLTEuNzkwOS00LTQtNGMtMi4yMDkxNCAwLTQgMS43OTA4Ni00IDRoMmMwLTEuMTA0NTcuODk1NDMtMiAyLTIgMS4xMDQ2IDAgMiAuODk1NDMgMiAyeiIgZmlsbD0iI2ZmZiIgZmlsbC1ydWxlPSJldmVub2RkIi8+PHBhdGggZD0ibTMgN2g2djZoLTZ6IiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-memory-white: url("data:image/svg+xml;base64,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");
 }
 
 .icon {
-    display: inline-block;
     vertical-align: middle;
     width: 16px;
     height: 16px;
@@ -179,10 +187,35 @@ pre:has(code) {
     background-repeat: no-repeat;
     background-position: 50% 50%;
 
-    &.icon-rkgk-grayscale {
+    &.icon-brackets {
-        background-image: var(--icon-rkgk-grayscale);
+        background-image: var(--icon-brackets);
+    }
+    &.icon-droplet {
+        background-image: var(--icon-droplet);
     }
     &.icon-external-link {
         background-image: var(--icon-external-link);
     }
+    &.icon-memory {
+        background-image: var(--icon-memory);
+    }
+    &.icon-object {
+        background-image: var(--icon-object);
+    }
+    &.icon-rkgk-grayscale {
+        background-image: var(--icon-rkgk-grayscale);
+    }
+
+    &.icon-brackets-white {
+        background-image: var(--icon-brackets-white);
+    }
+    &.icon-droplet-white {
+        background-image: var(--icon-droplet-white);
+    }
+    &.icon-memory-white {
+        background-image: var(--icon-memory-white);
+    }
+    &.icon-object-white {
+        background-image: var(--icon-object-white);
+    }
 }

static/brush-cost.js

@@ -0,0 +1,81 @@
+class Gauge extends HTMLElement {
+    constructor(iconName, label) {
+        super();
+
+        this.iconName = iconName;
+        this.label = label;
+    }
+
+    connectedCallback() {
+        this.role = "progressbar";
+        this.classList.add("icon", `icon-${this.iconName}`);
+
+        this.full = this.appendChild(document.createElement("div"));
+        this.full.classList.add("full", "icon", `icon-${this.iconName}-white`);
+    }
+
+    setValue(value, valueMax) {
+        let clampedNormalized = Math.max(0, Math.min(1, value / valueMax));
+        this.style.setProperty("--progress", `${clampedNormalized * 100}%`);
+        this.title = `${this.label}: ${value} / ${valueMax} (${Math.ceil((value / valueMax) * 100)}%)`;
+    }
+}
+
+customElements.define("rkgk-brush-cost-gauge", Gauge);
+
+export class BrushCostGauges extends HTMLElement {
+    constructor() {
+        super();
+    }
+
+    connectedCallback() {
+        this.codeSizeGauge = this.appendChild(
+            createGauge({
+                className: "code-size",
+                iconName: "brackets",
+                label: "Code size",
+            }),
+        );
+        this.fuelGauge = this.appendChild(
+            createGauge({
+                className: "fuel",
+                iconName: "droplet",
+                label: "Fuel",
+            }),
+        );
+        this.objectsGauge = this.appendChild(
+            createGauge({
+                className: "objects",
+                iconName: "object",
+                label: "Objects",
+            }),
+        );
+        this.memoryGauge = this.appendChild(
+            createGauge({
+                className: "memory",
+                iconName: "memory",
+                label: "Bulk memory",
+            }),
+        );
+
+        this.codeSizeGauge.setValue(0);
+        this.fuelGauge.setValue(0);
+        this.objectsGauge.setValue(0);
+        this.memoryGauge.setValue(0);
+    }
+
+    update(stats) {
+        this.codeSizeGauge.setValue(stats.astSize, stats.astSizeMax);
+        this.fuelGauge.setValue(stats.fuel, stats.fuelMax);
+        this.objectsGauge.setValue(stats.numRefs, stats.numRefsMax);
+        this.memoryGauge.setValue(stats.memory, stats.memoryMax);
+    }
+}
+
+customElements.define("rkgk-brush-cost-gauges", BrushCostGauges);
+
+function createGauge({ className, iconName, label }) {
+    let gauge = new Gauge(iconName, label);
+    gauge.classList.add(className);
+    return gauge;
+}

static/haku.js

@@ -257,4 +257,24 @@ export class Haku {
 
         return { status: "ok" };
     }
+
+    get astSize() {
+        if (this.#pBrush != 0) {
+            return w.haku_stat_ast_size(this.#pBrush);
+        } else {
+            return 0;
+        }
+    }
+
+    get numRefs() {
+        return w.haku_stat_num_refs(this.#pInstance);
+    }
+
+    get remainingFuel() {
+        return w.haku_stat_remaining_fuel(this.#pInstance);
+    }
+
+    get remainingMemory() {
+        return w.haku_stat_remaining_memory(this.#pInstance);
+    }
 }

static/icon/brackets-white.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 4H4V12H7M9 4H12V12H9" stroke="white" stroke-width="2"/>
+</svg>

static/icon/brackets.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 4H4V12H7M9 4H12V12H9" stroke="black" stroke-width="2"/>
+</svg>

static/icon/droplet-white.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5 10C5 8.36528 6.00212 5.72844 7.18726 3.45463C7.53619 2.78519 8.46381 2.78519 8.81274 3.45463C9.99788 5.72844 11 8.36528 11 10C11 12 9.5 13 8 13C6.5 13 5 12 5 10Z" fill="white"/>
+</svg>

static/icon/droplet.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5 10C5 8.36528 6.00212 5.72844 7.18726 3.45463C7.53619 2.78519 8.46381 2.78519 8.81274 3.45463C9.99788 5.72844 11 8.36528 11 10C11 12 9.5 13 8 13C6.5 13 5 12 5 10Z" fill="black"/>
+</svg>

static/icon/memory-white.svg

@@ -0,0 +1,9 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect x="5.05" y="3.05" width="5.9" height="9.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="4.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="4.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="7.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="7.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="10.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="10.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+</svg>

static/icon/memory.svg

@@ -0,0 +1,9 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect x="5.05" y="3.05" width="5.9" height="9.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="4.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="4.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="7.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="7.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="10.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="10.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+</svg>

static/icon/object-white.svg

@@ -0,0 +1,4 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M12 6C12 7.10457 11.1046 8 10 8V10C12.2091 10 14 8.20914 14 6C14 3.79086 12.2091 2 10 2C7.79086 2 6 3.79086 6 6H8C8 4.89543 8.89543 4 10 4C11.1046 4 12 4.89543 12 6Z" fill="white"/>
+<rect x="3" y="7" width="6" height="6" stroke="white" stroke-width="2"/>
+</svg>

static/icon/object.svg

@@ -0,0 +1,4 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M12 6C12 7.10457 11.1046 8 10 8V10C12.2091 10 14 8.20914 14 6C14 3.79086 12.2091 2 10 2C7.79086 2 6 3.79086 6 6H8C8 4.89543 8.89543 4 10 4C11.1046 4 12 4.89543 12 6Z" fill="black"/>
+<rect x="3" y="7" width="6" height="6" stroke="black" stroke-width="2"/>
+</svg>

static/index.css

@@ -32,7 +32,10 @@ main {
         padding: 16px;
 
         display: grid;
-        grid-template-columns: [left] 1fr [right-resize] auto [right] minmax(0, var(--right-width));
+        grid-template-columns: [left] 1fr [right-resize] auto [right] minmax(
+                0,
+                var(--right-width)
+            );
 
         /* Pass all events through. Children may receive events as normal. */
         pointer-events: none;
@@ -67,11 +70,23 @@ main {
                 pointer-events: auto;
             }
 
-            &>.floating>rkgk-brush-preview {
+            & > .floating {
+                display: flex;
+                flex-direction: column;
+
+                gap: 12px;
+
+                & > rkgk-brush-preview {
                     width: 128px;
                     height: 128px;
                     pointer-events: auto;
                 }
+
+                & > rkgk-brush-cost-gauges {
+                    width: 100%;
+                    pointer-events: auto;
+                }
+            }
         }
     }
 
@@ -119,7 +134,8 @@ rkgk-resize-handle {
             opacity: 0%;
         }
 
-        &:hover>.visual, &.dragging>.visual {
+        &:hover > .visual,
+        &.dragging > .visual {
             opacity: 100%;
         }
     }
@@ -306,7 +322,8 @@ rkgk-brush-editor.rkgk-panel {
         box-sizing: border-box;
     }
 
-    &>.errors:empty, &>.error-header:empty {
+    & > .errors:empty,
+    & > .error-header:empty {
         display: none;
     }
 
@@ -334,11 +351,17 @@ rkgk-brush-preview {
     display: block;
     position: relative;
 
-    background:
+    background: repeating-conic-gradient(
-        repeating-conic-gradient(var(--checkerboard-light) 0% 25%, var(--checkerboard-dark) 0% 50%)
+            var(--checkerboard-light) 0% 25%,
+            var(--checkerboard-dark) 0% 50%
+        )
         50% 50% / var(--checkerboard-size) var(--checkerboard-size);
     border-radius: 4px;
 
+    & > canvas {
+        border-radius: 4px;
+    }
+
     &.error {
         & > canvas {
             display: none;
@@ -354,6 +377,49 @@ rkgk-brush-preview {
     }
 }
 
+/* Brush cost gauges */
+
+rkgk-brush-cost-gauges,
+rkgk-brush-cost-gauges.rkgk-panel {
+    --gauge-size: 20px;
+
+    height: var(--gauge-size);
+    border-radius: 4px;
+
+    display: flex;
+    flex-direction: row;
+
+    overflow: clip; /* clip corners */
+
+    & > rkgk-brush-cost-gauge {
+        display: block;
+        height: var(--gauge-size);
+        flex-grow: 1;
+
+        & > .full {
+            width: 100%;
+            height: 100%;
+
+            clip-path: xywh(0 0 var(--progress) 100%);
+
+            background-color: var(--gauge-color);
+        }
+
+        &.code-size {
+            --gauge-color: var(--color-brand-blue);
+        }
+        &.fuel {
+            --gauge-color: #f44096;
+        }
+        &.objects {
+            --gauge-color: #fd9916;
+        }
+        &.memory {
+            --gauge-color: #5aca40;
+        }
+    }
+}
+
 /* Welcome screen */
 
 rkgk-welcome {
@@ -369,7 +435,8 @@ rkgk-welcome {
 /* Connection status dialogs */
 
 rkgk-connection-status {
-    &>dialog[name='logging-in-dialog'][open], &>dialog[name='disconnected-dialog'][open] {
+    & > dialog[name="logging-in-dialog"][open],
+    & > dialog[name="disconnected-dialog"][open] {
         border: none;
         outline: none;
         background: none;
@@ -379,8 +446,8 @@ rkgk-connection-status {
         align-items: center;
     }
 
-    &>dialog[name='error-dialog'][open] {
+    & > dialog[name="error-dialog"][open] {
-        & textarea[name='error-text'] {
+        & textarea[name="error-text"] {
             box-sizing: border-box;
             width: 100%;
             resize: none;
@@ -439,4 +506,3 @@ rkgk-connection-status {
         border-right: 1px solid var(--color-panel-border);
     }
 }
-

static/index.js

@@ -18,6 +18,7 @@ let canvasRenderer = main.querySelector("rkgk-canvas-renderer");
 let reticleRenderer = main.querySelector("rkgk-reticle-renderer");
 let brushEditor = main.querySelector("rkgk-brush-editor");
 let brushPreview = main.querySelector("rkgk-brush-preview");
+let brushCostGauges = main.querySelector("rkgk-brush-cost-gauges");
 let welcome = main.querySelector("rkgk-welcome");
 let connectionStatus = main.querySelector("rkgk-connection-status");
 
@@ -251,12 +252,15 @@ function readUrl(urlString) {
         let compileResult = currentUser.setBrush(brushEditor.code);
         brushEditor.renderHakuResult("Compilation", compileResult);
 
+        brushCostGauges.update(currentUser.getStats(session.wallInfo));
+
         if (compileResult.status != "ok") {
             brushPreview.setErrorFlag();
             return;
         }
 
         brushPreview.renderBrush(currentUser.haku).then((previewResult) => {
+            brushCostGauges.update(currentUser.getStats(session.wallInfo));
             if (previewResult.status == "error") {
                 brushEditor.renderHakuResult(
                     previewResult.phase == "eval" ? "Evaluation" : "Rendering",

static/online-users.js

@@ -89,6 +89,19 @@ export class User {
             return false;
         }
     }
+
+    getStats(wallInfo) {
+        return {
+            astSize: this.haku.astSize,
+            astSizeMax: wallInfo.hakuLimits.ast_capacity,
+            numRefs: this.haku.numRefs,
+            numRefsMax: wallInfo.hakuLimits.ref_capacity,
+            fuel: wallInfo.hakuLimits.fuel - this.haku.remainingFuel,
+            fuelMax: wallInfo.hakuLimits.fuel,
+            memory: wallInfo.hakuLimits.memory - this.haku.remainingMemory,
+            memoryMax: wallInfo.hakuLimits.memory,
+        };
+    }
 }
 
 export class OnlineUsers extends EventTarget {

template/index.hbs.html

@@ -21,6 +21,7 @@
         <script type="module">
             import "rkgk/live-reload.js";
 
+            import "rkgk/brush-cost.js";
             import "rkgk/brush-editor.js";
             import "rkgk/brush-preview.js";
             import "rkgk/canvas-renderer.js";
@@ -64,6 +65,7 @@
                 <div class="right">
                     <div class="floating">
                         <rkgk-brush-preview></rkgk-brush-preview>
+                        <rkgk-brush-cost-gauges class="rkgk-panel"></rkgk-brush-cost-gauges>
                     </div>
                     <rkgk-resize-handle
                         data-direction="vertical"