GRAPHS!!!

web/package.json

@@ -16,7 +16,10 @@
     "@codemirror/state": "^6.5.1",
     "@codemirror/theme-one-dark": "github:codemirror/theme-one-dark",
     "@codemirror/view": "^6.36.2",
+    "@mermaid-js/layout-elk": "^0.1.7",
     "codemirror": "^6.0.1",
+    "mermaid": "^11.4.1",
+    "panzoom": "^9.4.3",
     "solid-js": "^1.9.4",
     "solid-markdown": "2.0.1",
     "yaml": "^2.7.0"

web/src/App.tsx

@@ -5,18 +5,24 @@ import { lazy, Match, Suspense, Switch } from "solid-js";
 const Editor = lazy(() =>
   import("./modes/editor/Editor").then((m) => ({ default: m.Editor }))
 );
+const Graph = lazy(() =>
+  import("./modes/graph/Graph").then((m) => ({ default: m.Graph }))
+);
 
 export function App() {
-  const editorMode = window.location.search.slice(1) == "editor";
+  const mode = window.location.search.slice(1);
   const initialStep = window.location.hash.slice(1);
 
   return (
-    <Switch fallback={<Guide content={CONTENT} initialStep={initialStep} />}>
-      <Match when={editorMode}>
-        <Suspense fallback={<p>Loading...</p>}>
+    <Suspense fallback={<p>Loading...</p>}>
+      <Switch fallback={<Guide content={CONTENT} initialStep={initialStep} />}>
+        <Match when={mode == "editor"}>
           <Editor />
-        </Suspense>
-      </Match>
-    </Switch>
+        </Match>
+        <Match when={mode == "graph"}>
+          <Graph />
+        </Match>
+      </Switch>
+    </Suspense>
   );
 }

web/src/index.css

@@ -69,6 +69,12 @@
   height: 100%;
 }
 
+.full-window {
+  overflow: hidden;
+  width: 100%;
+  height: 100%;
+}
+
 @layer utils {
   .button-list {
     display: inline-grid;

web/src/modes/editor/CodeMirror.tsx

@@ -1,29 +1,60 @@
 import { EditorView, basicSetup } from "codemirror";
-import { onCleanup } from "solid-js";
+import { createEffect, onCleanup } from "solid-js";
 import { yaml } from "@codemirror/lang-yaml";
 import { indentWithTab } from "@codemirror/commands";
 import { oneDark } from "@codemirror/theme-one-dark";
-import { keymap } from "@codemirror/view";
+import { keymap, ViewPlugin } from "@codemirror/view";
 import { customLinter } from "./linter";
 import { lintGutter } from "@codemirror/lint";
 
 export interface CodeMirrorProps {
-  content?: string;
+  initialContent?: string;
+  showStep?: string;
+  onChange?: (content: string) => void;
 }
 
 export function CodeMirror(props: CodeMirrorProps) {
   let view = new EditorView({
-    doc: props.content,
+    doc: props.initialContent,
     extensions: [
       basicSetup,
       oneDark,
       yaml(),
       customLinter,
       lintGutter(),
       keymap.of([indentWithTab]),
+      ViewPlugin.define((view) => ({
+        update(update) {
+          if (update.docChanged) {
+            props.onChange?.(view.state.doc.toString());
+          }
+        },
+      })),
     ],
   });
 
+  function findStep(step: string) {
+    let i = 1;
+    for (const line of view.state.doc.iterLines()) {
+      if (line.startsWith(step)) return i;
+      i++;
+    }
+  }
+
+  async function scrollToStep(step: string) {
+    if (!step) return;
+    const lineNumber = await findStep(step);
+    if (lineNumber == undefined) return;
+    const line = view.state.doc.line(lineNumber);
+    if (!line) return;
+    const block = view.lineBlockAt(line.from);
+    view.scrollDOM.scrollTo({ ...block, behavior: "smooth" });
+  }
+
+  createEffect(async () => {
+    if (props.showStep) await scrollToStep(props.showStep);
+  });
+
   onCleanup(() => view.destroy());
 
   return <>{view.dom}</>;

web/src/modes/editor/Editor.tsx

@@ -1,13 +1,66 @@
 import contentRaw from "$content/guide.yaml?raw";
 import { CodeMirror } from "./CodeMirror";
+import {
+  createSignal,
+  ErrorBoundary,
+  lazy,
+  Suspense,
+  createMemo,
+} from "solid-js";
+import YAML from "yaml";
+import { contentToMermaid } from "../graph/mermaid";
+import { Button } from "$components/Button";
 
 import "./editor.css";
+import { download } from "./util";
+
+const Mermaid = lazy(() =>
+  import("../graph/Mermaid").then((m) => ({ default: m.Mermaid }))
+);
 
 export function Editor() {
+  const [showStep, setShowStep] = createSignal<string>();
+  const [content, setContent] = createSignal(contentRaw);
+  const mermaid = createMemo(() => contentToMermaid(YAML.parse(content())));
+
   return (
-    <div id="editor">
-      <CodeMirror content={contentRaw} />
-      <div>E</div>
+    <div id="editor" class="full-window">
+      <div>
+        <CodeMirror
+          initialContent={content()}
+          onChange={setContent}
+          showStep={showStep()}
+        />
+      </div>
+
+      <div class="full-window">
+        <div class="toolbar">
+          <Button onClick={() => download("guide.yaml", content())}>
+            Download YAML
+          </Button>
+          <Button
+            onClick={() =>
+              download("guide.md", "```mermaid\n" + mermaid() + "\n```")
+            }
+          >
+            Download Mermaid
+          </Button>
+        </div>
+
+        <Suspense fallback={<p>Loading...</p>}>
+          <ErrorBoundary
+            fallback={(err) => (
+              <div>
+                Error rendering graph
+                <br />
+                <pre>{err.toString()}</pre>
+              </div>
+            )}
+          >
+            <Mermaid content={mermaid()} onClick={setShowStep} />
+          </ErrorBoundary>
+        </Suspense>
+      </div>
     </div>
   );
 }

web/src/modes/editor/editor.css

@@ -1,15 +1,21 @@
-body {
-  overflow: hidden;
-}
-
 #editor {
   flex-grow: 1;
 
   width: 100vw;
   height: 100vh;
 
   display: grid;
-  grid-template-columns: repeat(2, 1fr);
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+
+#editor .toolbar {
+  background: #222;
+  padding: 0.25rem;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.25rem;
+  position: relative;
+  z-index: 10;
 }
 
 .cm-editor {

web/src/modes/editor/linter.ts

@@ -1,5 +1,5 @@
 import { Step } from "$lib/content";
-import { ensureSyntaxTree, Language, syntaxTree } from "@codemirror/language";
+import { ensureSyntaxTree, syntaxTree } from "@codemirror/language";
 import { linter, Diagnostic } from "@codemirror/lint";
 
 type SyntaxNodeRef = Parameters<
@@ -146,11 +146,18 @@ export const customLinter = linter(
     tree.cursor().iterate(enter, leave);
 
     // Analyze steps
-    const stepKeys = new Set([...steps.keys()]);
-    console.log(stepKeys);
     for (const [key, step] of steps) {
+      if (!step.title) {
+        diagnostics.push({
+          from: step.keyNode.from,
+          to: step.keyNode.to,
+          severity: "error",
+          message: `Step '${key}' does not have a 'title'!`,
+        });
+      }
+
       for (const [target, optionNodes] of step.optionTargets) {
-        if (!stepKeys.has(target)) {
+        if (!steps.has(target)) {
           for (const optionNode of optionNodes) {
             diagnostics.push({
               from: optionNode.from,

web/src/modes/editor/util.ts

@@ -0,0 +1,14 @@
+export function download(
+  filename: string,
+  content: string,
+  type = "text/plain"
+) {
+  const blob = new Blob([content], { type });
+  const href = URL.createObjectURL(blob);
+
+  const a = document.createElement("a");
+  a.setAttribute("download", filename);
+  a.setAttribute("href", href);
+  a.click();
+  URL.revokeObjectURL(href);
+}

web/src/modes/graph/Graph.tsx

@@ -0,0 +1,11 @@
+import { CONTENT } from "$lib/content";
+import { contentToMermaid } from "./mermaid";
+import { Mermaid } from "./Mermaid";
+
+export function Graph() {
+  return (
+    <div class="full-window">
+      <Mermaid content={contentToMermaid(CONTENT)} />
+    </div>
+  );
+}

web/src/modes/graph/Mermaid.tsx

@@ -0,0 +1,53 @@
+import { createResource, onMount, onCleanup } from "solid-js";
+import mermaid from "mermaid";
+import elkLayouts from "@mermaid-js/layout-elk";
+import panzoom, { PanZoom } from "panzoom";
+
+import "./mermaid.css";
+
+mermaid.registerLayoutLoaders(elkLayouts);
+mermaid.initialize({
+  startOnLoad: false,
+  theme: "dark",
+  layout: "elk",
+  elk: {
+    nodePlacementStrategy: "LINEAR_SEGMENTS",
+    cycleBreakingStrategy: "MODEL_ORDER",
+  },
+});
+
+export interface MermaidProps {
+  content: string;
+  onClick?: (step: string) => void;
+}
+
+export function Mermaid(props: MermaidProps) {
+  const [svg] = createResource(async () => {
+    const { svg } = await mermaid.render("mermaid", props.content);
+    return svg;
+  });
+
+  let element: HTMLDivElement | undefined = undefined;
+  let controls: PanZoom;
+
+  onMount(() => {
+    controls = panzoom(element!, {
+      bounds: true,
+      boundsPadding: 0.0,
+    });
+  });
+
+  onCleanup(() => {
+    controls.dispose();
+  });
+
+  function onClick(ev: MouseEvent) {
+    const element = ev.target as Element;
+    const parent = element.closest("g.node");
+    if (!parent) return;
+    const step = parent.getAttribute("id")?.split("-").slice(1, -1).join("-");
+    if (step) props.onClick?.(step);
+  }
+
+  return <div id="mermaid" ref={element} onClick={onClick} innerHTML={svg()} />;
+}

web/src/modes/graph/mermaid.css

@@ -0,0 +1,11 @@
+#mermaid .node.default {
+  cursor: pointer;
+}
+
+#mermaid .node.default .label-container {
+  transition: fill 0.1s;
+}
+
+#mermaid .node.default:hover .label-container {
+  fill: #333;
+}

web/src/modes/graph/mermaid.ts

@@ -0,0 +1,34 @@
+import { Content } from "$lib/content";
+
+export function contentToMermaid(content: Content) {
+  let mermaid = `graph TD\n`;
+
+  for (const [stepName, step] of Object.entries(content)) {
+    let title = `"${step.title.replace('"', "#quot;")}"`;
+    if (stepName == "start" || !step.options?.length) {
+      title = "([" + title + "])";
+    } else if ((step.options?.length ?? 0) > 1) {
+      title = "{{" + title + "}}";
+    } else {
+      title = "[" + title + "]";
+    }
+
+    if (step.options?.length) {
+      let first = true;
+      for (const option of step.options) {
+        mermaid += `\t${stepName}`;
+
+        if (first) {
+          mermaid += `${title}`;
+          first = false;
+        }
+
+        mermaid += ` --"${option.label}"--> ${option.target}\n`;
+      }
+    } else {
+      mermaid += `\t${stepName}${title}\n`;
+    }
+  }
+
+  return mermaid;
+}