Properties, and ticking checkboxes without editing (web)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Frontend/src/Components/PreviewPane.jsx

@@ -11,6 +11,7 @@ import MarkdownItFootnote from "markdown-it-footnote";
 
 import { LivePreview } from "../LivePreview.js";
 import { DiagramHtml, RenderDiagramsIn } from "../Mermaid.js";
+import { ParseProperties, PropertiesHtml, TaskLines, ToggleLine, WithoutProperties } from "../Properties.js";
 
 import {
   FetchBlame,
@@ -54,6 +55,17 @@ MarkdownRenderer.renderer.rules.fence = (Tokens, Index, Options, Env, Self) => {
   return DefaultFenceRenderer(Tokens, Index, Options, Env, Self);
 };
 
+function RenderPropertiesPanel(Text, CanEdit) {
+  const Parsed = ParseProperties(Text);
+  if (!Parsed || Parsed.Properties.length === 0) return "";
+  return PropertiesHtml(
+    Parsed,
+    (Value) => MarkdownRenderer.renderInline(Value),
+    MarkdownRenderer.utils.escapeHtml,
+    CanEdit,
+  );
+}
+
 const TextTypes = ["markdown", "text", "config", "html"];
 
 const LinkedFileTypeMap = {
@@ -221,10 +233,21 @@ export default function PreviewPane({
     }
   }, [RootName, FilePath, FileType, ShowGitBlame]);
 
-  // Draw the rendered view's diagrams once its HTML is on the page.
+  // Once the rendered view's HTML is on the page: draw its diagrams, and
+  // switch off task checkboxes that can't be ticked here. They're matched to
+  // the note's lines in order, which only works when the server's version
+  // (with portals filled in) has the same tasks as the note itself.
   useEffect(() => {
-    if (MarkdownBodyRef.current) RenderDiagramsIn(MarkdownBodyRef.current);
-  }, [ResolvedContent, FileType, IsEditing, MarkdownEditing, IsGuest]);
+    const Body = MarkdownBodyRef.current;
+    if (!Body) return;
+    RenderDiagramsIn(Body);
+    const Boxes = Body.querySelectorAll(".task-list-item-checkbox");
+    const Matches = Boxes.length === TaskLines(Content).length;
+    Boxes.forEach((Box) => {
+      Box.disabled = IsGuest || !Matches;
+      Box.title = IsGuest ? "Log in to change this" : Matches ? "" : "This note embeds others: edit it to change this";
+    });
+  }, [Content, ResolvedContent, FileType, IsEditing, MarkdownEditing, IsGuest]);
 
   if (!FilePath) {
     return <div className="PreviewEmpty">Select a file to preview.</div>;
@@ -250,7 +273,39 @@ export default function PreviewPane({
     }
   }
 
+  async function ToggleAndSave(LineIndex, Box) {
+    const Previous = Content;
+    const Changed = ToggleLine(Content, LineIndex);
+    SetContent(Changed);
+    SetSaveError(null);
+    try {
+      await SaveFile(RootName, FilePath, Changed);
+      RefreshResolvedContent();
+      if (ShowGitBlame) {
+        FetchBlame(RootName, FilePath)
+          .then(SetBlameMap)
+          .catch(() => {});
+      }
+    } catch (Error) {
+      SetContent(Previous);
+      Box.checked = !Box.checked;
+      SetSaveError(Error.message);
+    }
+  }
+
   function HandleMarkdownClick(Event) {
+    const Box = Event.target.closest('input[type="checkbox"]');
+    if (Box) {
+      if (Box.classList.contains("PropertyCheckbox")) {
+        ToggleAndSave(Number(Box.dataset.line), Box);
+      } else if (Box.classList.contains("task-list-item-checkbox")) {
+        const Boxes = Array.from(MarkdownBodyRef.current.querySelectorAll(".task-list-item-checkbox"));
+        const Line = TaskLines(Content)[Boxes.indexOf(Box)];
+        if (Line !== undefined) ToggleAndSave(Line, Box);
+      }
+      return;
+    }
+
     const AnchorElement = Event.target.closest("a");
     if (!AnchorElement) return;
 
@@ -349,13 +404,14 @@ export default function PreviewPane({
           <a className="DownloadButton" href={GetDownloadUrl(RootName, FilePath)}>
             Download
           </a>
+          {SaveError && <span className="SaveErrorText">{SaveError}</span>}
         </div>
         <div
           className="MarkdownBody"
           ref={MarkdownBodyRef}
           onClick={HandleMarkdownClick}
           dangerouslySetInnerHTML={{
-            __html: MarkdownRenderer.render(ResolvedContent, {
+            __html: RenderPropertiesPanel(Content, !IsGuest) + MarkdownRenderer.render(WithoutProperties(ResolvedContent), {
               ResolveImageSrc: (Src) => {
                 const ResolvedPath = ResolveRelativeLink(FilePath, Src);
                 return ResolvedPath === null ? Src : GetFileUrl(RootName, ResolvedPath);

Frontend/src/LivePreview.js

@@ -3,13 +3,15 @@
 // > and list markers) hidden. Wherever the cursor is, the syntax comes back so
 // it can be edited: a heading's #s on its line, a bold's ** inside it.
 // The colours are the same roles as .MarkdownBody (Styles/Theme.css).
-// ```mermaid blocks show as their diagram until the cursor goes into them.
+// ```mermaid blocks show as their diagram until the cursor goes into them,
+// and the properties block at the top (Properties.js) as its panel.
 
 import { syntaxTree } from "@codemirror/language";
-import { StateField } from "@codemirror/state";
+import { StateEffect, StateField } from "@codemirror/state";
 import { Decoration, EditorView, ViewPlugin, WidgetType } from "@codemirror/view";
 
 import { RenderDiagram } from "./Mermaid.js";
+import { ParseProperties, PropertiesHtml, ToggleLine } from "./Properties.js";
 
 class BulletWidget extends WidgetType {
   eq() {
@@ -103,6 +105,57 @@ class DiagramWidget extends WidgetType {
   }
 }
 
+function EscapeHtml(Text) {
+  return Text.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
+}
+
+// The properties block drawn as its panel. A true/false checkbox flips the
+// value without opening the block; clicking anywhere else opens it to edit.
+class PropertiesWidget extends WidgetType {
+  constructor(Html) {
+    super();
+    this.Html = Html;
+  }
+
+  eq(Other) {
+    return this.Html === Other.Html;
+  }
+
+  toDOM(View) {
+    const Element = document.createElement("div");
+    Element.className = "MarkdownBody cm-LiveProperties";
+    Element.style.padding = "0";
+    Element.innerHTML = this.Html;
+    Element.addEventListener("mousedown", (Event) => {
+      Event.preventDefault();
+      const Box = Event.target.closest(".PropertyCheckbox");
+      const Doc = View.state.doc;
+      if (Box) {
+        const Line = Doc.line(Number(Box.dataset.line) + 1);
+        const Changed = ToggleLine(Line.text, 0);
+        View.dispatch({ changes: { from: Line.from, to: Line.to, insert: Changed } });
+        return;
+      }
+      View.dispatch({ selection: { anchor: Doc.line(Math.min(2, Doc.lines)).from } });
+      View.focus();
+    });
+    return Element;
+  }
+
+  ignoreEvent() {
+    return true;
+  }
+}
+
+// Where the properties block ends (0 if there isn't one): the plugin below
+// leaves it alone, since Markdown would read it as a rule and a heading.
+function PropertiesEnd(State) {
+  const Doc = State.doc;
+  if (!/^---\s*$/.test(Doc.line(1).text)) return 0;
+  const Parsed = ParseProperties(Doc.sliceString(0, Math.min(Doc.length, 20000)));
+  return Parsed ? Parsed.EndOffset : 0;
+}
+
 const Hidden = Decoration.replace({});
 const Bullet = Decoration.replace({ widget: new BulletWidget() });
 const Rule = Decoration.replace({ widget: new RuleWidget() });
@@ -157,11 +210,15 @@ function BuildDecorations(View) {
     Ranges.push(Hidden.range(From, End));
   }
 
+  const PropertiesTo = PropertiesEnd(State);
+  if (PropertiesTo > 0) AddLineClass(0, PropertiesTo, "cm-LiveFrontmatter");
+
   for (const { from, to } of View.visibleRanges) {
     syntaxTree(State).iterate({
       from,
       to,
       enter(Node) {
+        if (Node.from < PropertiesTo) return Node.to <= PropertiesTo ? false : undefined;
         const Name = Node.name;
         const Parent = Node.node.parent;
         const ParentName = Parent ? Parent.name : "";
@@ -257,8 +314,8 @@ function BuildDecorations(View) {
 }
 
 // Diagrams replace whole lines, which CodeMirror only allows from a state
-// field, not from the plugin above. Without focus info here, a block shows
-// as code while the cursor (or selection) is in it, even when unfocused.
+// field, not from the plugin above. A block shows as code while the cursor
+// (or selection) is in it and the editor has focus.
 function BuildDiagrams(State) {
   const Doc = State.doc;
   const Ranges = [];
@@ -271,7 +328,7 @@ function BuildDiagrams(State) {
 
       const From = Doc.lineAt(Node.from).from;
       const To = Doc.lineAt(Node.to).to;
-      if (State.selection.ranges.some((Range) => Range.from <= To && Range.to >= From)) return false;
+      if (CursorIn(State, From, To)) return false;
 
       const Code = Node.node.getChild("CodeText");
       const Source = Code ? Doc.sliceString(Code.from, Code.to) : "";
@@ -283,17 +340,64 @@ function BuildDiagrams(State) {
   return Decoration.set(Ranges, true);
 }
 
+// Whether the editor has focus, for the fields below (the plugin above asks
+// the view; fields only see the state). Unfocused, everything shows rendered.
+const SetFocused = StateEffect.define();
+const Focused = StateField.define({
+  create: () => false,
+  update(Current, Transaction) {
+    for (const Effect of Transaction.effects) {
+      if (Effect.is(SetFocused)) return Effect.value;
+    }
+    return Current;
+  },
+});
+const TrackFocus = EditorView.focusChangeEffect.of((State, Focusing) => SetFocused.of(Focusing));
+
+function CursorIn(State, From, To) {
+  if (!State.field(Focused, false)) return false;
+  return State.selection.ranges.some((Range) => Range.from <= To && Range.to >= From);
+}
+
+function FocusChanged(Transaction) {
+  return Transaction.effects.some((Effect) => Effect.is(SetFocused));
+}
+
+function BuildProperties(State) {
+  const To = PropertiesEnd(State);
+  if (To === 0) return Decoration.none;
+  if (CursorIn(State, 0, To)) return Decoration.none;
+  const Parsed = ParseProperties(State.doc.sliceString(0, To));
+  if (!Parsed || Parsed.Properties.length === 0) return Decoration.none;
+  const Html = PropertiesHtml(Parsed, EscapeHtml, EscapeHtml, true);
+  return Decoration.set([Decoration.replace({ widget: new PropertiesWidget(Html), block: true }).range(0, To)]);
+}
+
+const PropertiesPanel = StateField.define({
+  create: BuildProperties,
+  update(Current, Transaction) {
+    if (Transaction.docChanged || Transaction.selection || FocusChanged(Transaction)) return BuildProperties(Transaction.state);
+    return Current;
+  },
+  provide: (Field) => EditorView.decorations.from(Field),
+});
+
 const Diagrams = StateField.define({
   create: BuildDiagrams,
   update(Current, Transaction) {
     const TreeChanged = syntaxTree(Transaction.state) !== syntaxTree(Transaction.startState);
-    if (Transaction.docChanged || Transaction.selection || TreeChanged) return BuildDiagrams(Transaction.state);
+    if (Transaction.docChanged || Transaction.selection || TreeChanged || FocusChanged(Transaction)) {
+      return BuildDiagrams(Transaction.state);
+    }
     return Current;
   },
   provide: (Field) => EditorView.decorations.from(Field),
 });
 
 export const LivePreview = [
+  Focused,
+  TrackFocus,
+  PropertiesPanel,
   Diagrams,
   ViewPlugin.fromClass(
     class {

Frontend/src/Properties.js

@@ -0,0 +1,109 @@
+// Properties, like Obsidian's: a block at the very top of a note,
+//
+//   ---
+//   Key: Value
+//   Done: true
+//   ---
+//
+// shown as a Properties panel instead of text. true/false values are
+// checkboxes that can be ticked without editing the note, like task list
+// items (- [ ]); the helpers for both are here, shared by the rendered view
+// (PreviewPane.jsx) and the live editor (LivePreview.js).
+
+const OpenOrClose = /^---\s*$/;
+const PropertyLine = /^([^:\s][^:]*?)\s*:\s*(.*)$/;
+const TaskLine = /^(\s*(?:[-*+]|\d+[.)])\s+)\[( |x|X)\]/;
+const FenceLine = /^ {0,3}(`{3,}|~{3,})/;
+
+// The block at the top, or null. Lines are the note's (0-based), so a
+// property can be changed in place. EndLine is the closing ---.
+export function ParseProperties(Text) {
+  const Lines = Text.split("\n");
+  if (!OpenOrClose.test(Lines[0] || "")) return null;
+  const EndLine = Lines.findIndex((Line, Index) => Index > 0 && OpenOrClose.test(Line));
+  if (EndLine === -1) return null;
+
+  const Properties = [];
+  for (let Index = 1; Index < EndLine; Index++) {
+    const Line = Lines[Index];
+    const Match = PropertyLine.exec(Line);
+    if (Match) {
+      Properties.push({ Key: Match[1], Value: Match[2].trim(), Line: Index });
+    } else if (Line.trim().startsWith("- ") && Properties.length > 0) {
+      // A list under the previous key ("Tags:" then "- one", "- two").
+      const Last = Properties[Properties.length - 1];
+      Last.List = [...(Last.List || []), Line.trim().slice(2).trim()];
+    } else if (Line.trim() !== "") {
+      // Not properties after all: a note that just starts with a --- rule.
+      return null;
+    }
+  }
+  const EndOffset = Lines.slice(0, EndLine + 1).join("\n").length;
+  return { Properties, EndLine, EndOffset };
+}
+
+export function IsBoolean(Value) {
+  return /^(true|false)$/i.test(Value);
+}
+
+// The note without its properties block (what Markdown renders).
+export function WithoutProperties(Text) {
+  const Parsed = ParseProperties(Text);
+  return Parsed ? Text.slice(Parsed.EndOffset).replace(/^\n/, "") : Text;
+}
+
+// Flips a true/false property, or a task's [ ]/[x], on one line of Text.
+export function ToggleLine(Text, LineIndex) {
+  const Lines = Text.split("\n");
+  const Line = Lines[LineIndex];
+  if (Line === undefined) return Text;
+  const Task = TaskLine.exec(Line);
+  if (Task) {
+    const Mark = Task[2] === " " ? "x" : " ";
+    Lines[LineIndex] = `${Task[1]}[${Mark}]${Line.slice(Task[0].length)}`;
+  } else {
+    Lines[LineIndex] = Line.replace(/:\s*(true|false)\s*$/i, (Whole, Value) =>
+      Whole.replace(Value, Value.toLowerCase() === "true" ? "false" : "true"),
+    );
+  }
+  return Lines.join("\n");
+}
+
+// The lines of the note's task items, in order, outside code blocks and the
+// properties block: the nth checkbox the rendered view shows is TaskLines[n].
+export function TaskLines(Text) {
+  const Lines = Text.split("\n");
+  const Parsed = ParseProperties(Text);
+  const Found = [];
+  let Fence = null;
+  for (let Index = Parsed ? Parsed.EndLine + 1 : 0; Index < Lines.length; Index++) {
+    const Line = Lines[Index];
+    const FenceMatch = FenceLine.exec(Line);
+    if (FenceMatch) {
+      if (Fence === null) Fence = FenceMatch[1];
+      else if (FenceMatch[1][0] === Fence[0] && FenceMatch[1].length >= Fence.length) Fence = null;
+      continue;
+    }
+    if (Fence === null && TaskLine.test(Line)) Found.push(Index);
+  }
+  return Found;
+}
+
+// The rendered view's panel. RenderInline renders a value's Markdown (links,
+// bold); Escape escapes text. Checkboxes carry their line in data-line.
+export function PropertiesHtml(Parsed, RenderInline, Escape, CanEdit) {
+  const Rows = Parsed.Properties.map(({ Key, Value, Line, List }) => {
+    let Shown;
+    if (IsBoolean(Value)) {
+      const Checked = Value.toLowerCase() === "true" ? " checked" : "";
+      const Disabled = CanEdit ? "" : " disabled";
+      Shown = `<input type="checkbox" class="PropertyCheckbox" data-line="${Line}"${Checked}${Disabled}>`;
+    } else if (List) {
+      Shown = List.map((Item) => `<span class="PropertyChip">${RenderInline(Item)}</span>`).join("");
+    } else {
+      Shown = Value ? RenderInline(Value) : `<span class="PropertyEmpty">Empty</span>`;
+    }
+    return `<div class="PropertyRow"><span class="PropertyKey">${Escape(Key)}</span><span class="PropertyValue">${Shown}</span></div>`;
+  });
+  return `<div class="Properties"><div class="PropertiesTitle">Properties</div>${Rows.join("")}</div>`;
+}

Frontend/src/Styles/Theme.css

@@ -510,6 +510,70 @@ img,
   cursor: pointer;
 }
 
+.Properties {
+  margin: 0 0 16px;
+  padding: 8px 12px;
+  background: var(--Surface);
+  border: 1px solid var(--Border);
+  border-radius: 4px;
+}
+
+.PropertiesTitle {
+  color: var(--TextMuted);
+  margin-bottom: 4px;
+}
+
+.PropertyRow {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 2px 0;
+}
+
+.PropertyKey {
+  flex: 0 0 30%;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  color: var(--TextMuted);
+}
+
+.PropertyValue {
+  flex: 1;
+  min-width: 0;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 4px;
+}
+
+.PropertyChip {
+  padding: 0 6px;
+  border-radius: 4px;
+  background: var(--SurfaceAlt);
+  color: var(--Purple);
+}
+
+.PropertyEmpty {
+  color: var(--TextMuted);
+  font-style: italic;
+}
+
+.PropertyCheckbox {
+  accent-color: var(--Purple);
+  margin: 0;
+  cursor: pointer;
+}
+
+.LiveEditor .cm-LiveProperties {
+  cursor: text;
+}
+
+.LiveEditor .cm-LiveFrontmatter {
+  color: var(--TextMuted);
+}
+
 .MarkdownBody blockquote {
   margin: 12px 0;
   padding: 6px 12px;