codemirror

apps/server/internal/httpserver/static/editor.js

@@ -11,15 +11,13 @@
   var conflictApply = document.querySelector("[data-conflict-apply]");
   var conflictDismiss = document.querySelector("[data-conflict-dismiss]");
   var conflictResolution = document.querySelector("[data-conflict-resolution]");
-  var conflictResolutionMount = document.querySelector("[data-conflict-monaco-mount]");
+  var conflictResolutionMount = document.querySelector("[data-conflict-codemirror-mount]");
   var conflictUseServer = document.querySelector("[data-conflict-use='server']");
   var conflictUseLocal = document.querySelector("[data-conflict-use='local']");
   var conflictUseBoth = document.querySelector("[data-conflict-use='both']");
-  var monacoContainer = document.querySelector("[data-monaco-mount]");
+  var codeMirrorContainer = document.querySelector("[data-codemirror-mount]");
-  var monacoLoaded = false;
+  var codeMirrorReadyPromise = null;
-  var monacoReadyPromise = null;
+  var codeMirrorModules = null;
-  var monacoDarkTheme = "cairnquire-dark";
-  var monacoLightTheme = "cairnquire-light";
 
   if (!form || !textarea || statusNodes.length === 0) {
     return;
@@ -36,6 +34,9 @@
   var conflictDiffView = null;
   var resolutionEditor = null;
   var suppressResolutionEvents = false;
+  var doneLink = document.querySelector("[data-done-link]");
+  var isSaving = false;
+  var suppressBeforeUnload = false;
 
   function setStatus(nextStatus) {
     statusNodes.forEach(function (node) {
@@ -223,7 +224,7 @@
     var value = getEditorValue();
     if (value === lastSavedValue) {
       setStatus("Saved");
-      return;
+      return "unchanged";
     }
 
     isSaving = true;
@@ -233,7 +234,7 @@
     if (!window.MDHubSync) {
       isSaving = false;
       setStatus("Queued");
-      return;
+      return "queued";
     }
 
     try {
@@ -249,16 +250,17 @@
         }
         setStatus("Saved");
         isSaving = false;
-        return;
+        return "saved";
       }
 
       if (result.status === "conflict") {
         showConflict(result.conflict, value);
         isSaving = false;
-        return;
+        return "conflict";
       }
 
       setStatus("Queued");
+      return "queued";
     } catch (err) {
       setStatus("Queued");
       throw err;
@@ -328,138 +330,236 @@
     }, 2000);
   }
 
-  function loadMonaco() {
+  function doneHref() {
-    if (monacoReadyPromise) {
+    return doneLink ? doneLink.getAttribute("href") : "/docs/" + path.replace(/\.md$/, "");
-      return monacoReadyPromise;
+  }
-    }
-    if (monacoLoaded && window.monaco) {
-      monacoReadyPromise = Promise.resolve();
-      return monacoReadyPromise;
-    }
-    monacoLoaded = true;
 
+  function clearScheduledSave() {
+    if (saveTimer) {
+      clearTimeout(saveTimer);
+      saveTimer = null;
+    }
+  }
+
+  function leaveEditorNow() {
+    clearScheduledSave();
+    suppressBeforeUnload = true;
+    window.location.href = doneHref();
+  }
+
+  function saveThenLeaveEditor() {
+    var href = doneHref();
+
+    if (currentConflict) {
+      setStatus("Conflict");
+      if (conflictNotice) {
+        conflictNotice.scrollIntoView({ behavior: "smooth", block: "center" });
+      }
+      return;
+    }
+
+    clearScheduledSave();
+
+    if (isSaving) {
+      waitForSaveThenNavigate(href);
+      return;
+    }
+
+    setStatus("Saving");
+    saveNow()
+      .then(function (result) {
+        if (result === "saved" || result === "unchanged") {
+          suppressBeforeUnload = true;
+          window.location.href = href;
+          return;
+        }
+
+        if (result === "conflict") {
+          setStatus("Conflict");
+          return;
+        }
+
+        setStatus("Queued");
+        if (window.confirm("Could not save. Leave without saving?")) {
+          suppressBeforeUnload = true;
+          window.location.href = href;
+        }
+      })
+      .catch(function () {
+        setStatus("Queued");
+        if (window.confirm("Could not save. Leave without saving?")) {
+          suppressBeforeUnload = true;
+          window.location.href = href;
+        }
+      });
+  }
+
+  function loadCodeMirror() {
+    if (codeMirrorReadyPromise) {
+      return codeMirrorReadyPromise;
+    }
+
+    codeMirrorReadyPromise = Promise.all([
+      import("/static/codemirror.bundle.js"),
+    ]).then(function (modules) {
+      var bundle = modules[0];
+      codeMirrorModules = {
+        cm: bundle,
+        markdown: bundle,
+        vim: bundle,
+      };
+      registerVimCommands();
+      return codeMirrorModules;
+    });
+
+    return codeMirrorReadyPromise;
+  }
+
+  function registerVimCommands() {
+    var Vim = codeMirrorModules && codeMirrorModules.vim && codeMirrorModules.vim.Vim;
+    if (!Vim) {
+      return;
+    }
+
+    Vim.defineEx("write", "w", function () {
+      saveNow().catch(function () {
+        setStatus("Queued");
+      });
+    });
+    Vim.defineEx("quit", "q", function () {
+      leaveEditorNow();
+    });
+    Vim.defineEx("wq", "wq", function () {
+      saveThenLeaveEditor();
+    });
+    Vim.defineEx("xit", "x", function () {
+      saveThenLeaveEditor();
+    });
+    Vim.map("<Esc>", ":q<CR>");
+  }
+
+  function codeMirrorTheme() {
+    var EditorView = codeMirrorModules.cm.EditorView;
     var isDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
 
-    monacoReadyPromise = new Promise(function (resolve) {
+    return EditorView.theme({
-      var script = document.createElement("script");
+      "&": {
-      script.src = "https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/min/vs/loader.js";
+        height: "100%",
-      script.onload = function () {
+        minHeight: "60vh",
-        require.config({
+        backgroundColor: "var(--panel)",
-          paths: { vs: "https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/min/vs" },
+        color: "var(--text)",
-        });
+        fontSize: "14px",
-        require(["vs/editor/editor.main"], function () {
+      },
-          monaco.editor.defineTheme(monacoDarkTheme, {
+      "&.cm-focused": {
-            base: "vs-dark",
+        outline: "none",
-            inherit: true,
+      },
-            rules: [
+      ".cm-scroller": {
-              { token: "comment", foreground: "8B9DAF", fontStyle: "italic" },
+        fontFamily: "'Iosevka', 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace",
-              { token: "keyword", foreground: "E8943A" },
+        lineHeight: "22px",
-              { token: "string", foreground: "C9A96E" },
+      },
-              { token: "number", foreground: "C9A96E" },
+      ".cm-content": {
-              { token: "type", foreground: "E8943A" },
+        padding: "12px 0",
-              { token: "tag", foreground: "E8943A" },
+        caretColor: "var(--accent)",
-              { token: "attribute.name", foreground: "D4A05A" },
+      },
-              { token: "attribute.value", foreground: "C9A96E" },
+      ".cm-line": {
-              { token: "delimiter", foreground: "B0B8C4" },
+        padding: "0 14px",
-              { token: "variable", foreground: "D4D8DE" },
+      },
-            ],
+      ".cm-gutters": {
-            colors: {
+        backgroundColor: "var(--panel-strong)",
-              "editor.background": "#1E1E1E",
+        borderRight: "1px solid var(--border)",
-              "editor.foreground": "#E8ECF0",
+        color: "var(--muted)",
-              "editor.lineHighlightBackground": "#282828",
+      },
-              "editor.selectionBackground": "#3A3A3A",
+      ".cm-activeLine, .cm-activeLineGutter": {
-              "editorLineNumber.foreground": "#555555",
+        backgroundColor: isDark ? "oklch(0.24 0.012 55)" : "#f0ede5",
-              "editorLineNumber.activeForeground": "#E8943A",
+      },
-              "editor.inactiveSelectionBackground": "#333333",
+      ".cm-selectionBackground, &.cm-focused .cm-selectionBackground": {
-              "editorCursor.foreground": "#E8943A",
+        backgroundColor: "color-mix(in srgb, var(--accent) 22%, transparent)",
-              "editorIndentGuide.background": "#2A2A2A",
+      },
-              "editorIndentGuide.activeBackground": "#3A3A3A",
+      ".cm-cursor": {
-              "editorWhitespace.foreground": "#2A2A2A",
+        borderLeftColor: "var(--accent)",
-              "editorGutter.background": "#1E1E1E",
+      },
-              "editorOverviewRuler.border": "#1E1E1E",
+      ".cm-panel": {
-              "scrollbarSlider.background": "#3A3A3A88",
+        backgroundColor: "var(--panel-strong)",
-              "scrollbarSlider.hoverBackground": "#4A4A4A88",
+        borderTop: "1px solid var(--border)",
-              "scrollbarSlider.activeBackground": "#5A5A5A88",
+        color: "var(--text)",
-              "minimap.background": "#1E1E1E",
+        fontFamily: "'Iosevka', 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace",
-            },
+      },
-          });
+      ".cm-vim-panel input": {
+        color: "var(--text)",
+      },
+    }, { dark: isDark });
+  }
 
-          monaco.editor.defineTheme(monacoLightTheme, {
+  function codeMirrorHighlighting() {
-            base: "vs",
+    var cm = codeMirrorModules.cm;
-            inherit: true,
+    var tags = codeMirrorModules.cm.tags;
-            rules: [
+    var urlColor = window.matchMedia("(prefers-color-scheme: dark)").matches
-              { token: "comment", foreground: "6A7B8C", fontStyle: "italic" },
+      ? "oklch(0.78 0.14 190)"
-              { token: "keyword", foreground: "C67A2A" },
+      : "#047c78";
-              { token: "string", foreground: "8A6D3B" },
-              { token: "number", foreground: "8A6D3B" },
-              { token: "type", foreground: "C67A2A" },
-              { token: "tag", foreground: "C67A2A" },
-              { token: "attribute.name", foreground: "A87D3A" },
-              { token: "attribute.value", foreground: "8A6D3B" },
-            ],
-            colors: {
-              "editor.background": "#FCFAF5",
-              "editor.foreground": "#1C2430",
-              "editor.lineHighlightBackground": "#F0EDE5",
-              "editor.selectionBackground": "#E8943A33",
-              "editorLineNumber.foreground": "#AAAAAA",
-              "editorLineNumber.activeForeground": "#C67A2A",
-              "editorCursor.foreground": "#C67A2A",
-              "editorIndentGuide.background": "#E8E5DD",
-              "editorGutter.background": "#FCFAF5",
-            },
-          });
 
-          if (monacoContainer) {
+    return cm.syntaxHighlighting(cm.HighlightStyle.define([
-            editor = monaco.editor.create(monacoContainer, {
+      {
-              value: textarea.value,
+        tag: [tags.url, tags.link],
-              language: "markdown",
+        color: urlColor,
-              theme: isDark ? monacoDarkTheme : monacoLightTheme,
+        textDecoration: "underline",
-              fontFamily: "'Iosevka', 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace",
+        textUnderlineOffset: "2px",
-              fontSize: 14,
+      },
-              lineHeight: 22,
+    ]));
-              minimap: { enabled: false },
+  }
-              wordWrap: "on",
-              scrollBeyondLastLine: false,
-              padding: { top: 12 },
-              renderLineHighlight: "line",
-              smoothScrolling: true,
-              cursorBlinking: "smooth",
-              cursorSmoothCaretAnimation: "on",
-              bracketPairColorization: { enabled: true },
-              automaticLayout: true,
-            });
 
-            textarea.hidden = true;
+  function createCodeMirrorEditor(mount, initialValue, options) {
-            monacoContainer.classList.add("monaco-mounted");
+    var cm = codeMirrorModules.cm;
+    var markdownModule = codeMirrorModules.markdown;
+    var vimModule = codeMirrorModules.vim;
+    var onChange = options && options.onChange ? options.onChange : function () {};
+    var extensions = [
+      vimModule.vim({ status: true }),
+      cm.basicSetup,
+      markdownModule.markdown({
+        base: markdownModule.markdownLanguage,
+      }),
+      cm.EditorView.lineWrapping,
+      codeMirrorTheme(),
+      codeMirrorHighlighting(),
+      cm.EditorView.updateListener.of(function (update) {
+        if (update.docChanged) {
+          onChange(update.state.doc.toString());
+        }
+      }),
+    ];
 
-            editor.onDidChangeModelContent(function () {
+    mount.replaceChildren();
-              textarea.value = editor.getValue();
+    mount.classList.add("codemirror-mounted");
-              scheduleSave();
-            });
 
-            if (window.MDHubSync) {
+    var view = new cm.EditorView({
-              editor.addCommand(monaco.KeyMod.CtrlCmd | monaco.KeyCode.KeyS, function () {
+      doc: initialValue,
-                saveNow().catch(function () {
+      extensions: extensions,
-                  setStatus("Queued");
+      parent: mount,
-                });
-              });
-            }
-
-            var darkMQ = window.matchMedia("(prefers-color-scheme: dark)");
-            darkMQ.addEventListener("change", function (e) {
-              monaco.editor.setTheme(e.matches ? monacoDarkTheme : monacoLightTheme);
-            });
-
-            editor.focus();
-          }
-
-          resolve();
-        });
-      };
-      document.head.appendChild(script);
     });
-    return monacoReadyPromise;
+
+    return {
+      view: view,
+      getValue: function () {
+        return view.state.doc.toString();
+      },
+      setValue: function (value) {
+        if (view.state.doc.toString() === value) {
+          return;
+        }
+        view.dispatch({
+          changes: { from: 0, to: view.state.doc.length, insert: value },
+        });
+      },
+      focus: function () {
+        view.focus();
+      },
+      hasTextFocus: function () {
+        return view.hasFocus;
+      },
+      destroy: function () {
+        view.destroy();
+      },
+    };
   }
 
   function ensureResolutionEditor() {
@@ -467,54 +567,42 @@
       return;
     }
 
-    loadMonaco().then(function () {
+    loadCodeMirror().then(function () {
-      if (!window.monaco || resolutionEditor) {
+      if (resolutionEditor) {
         return;
       }
 
-      var isDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
+      resolutionEditor = createCodeMirrorEditor(conflictResolutionMount, conflictResolution.value || resolvedConflictContent, {
-      resolutionEditor = monaco.editor.create(conflictResolutionMount, {
+        onChange: function (value) {
-        value: conflictResolution.value || resolvedConflictContent,
+          if (suppressResolutionEvents) {
-        language: "markdown",
+            return;
-        theme: isDark ? monacoDarkTheme : monacoLightTheme,
+          }
-        fontFamily: "'Iosevka', 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace",
+          resolvedConflictContent = value;
-        fontSize: 14,
+          conflictResolution.value = value;
-        lineHeight: 22,
+          if (conflictApply) {
-        minimap: { enabled: false },
+            conflictApply.disabled = false;
-        wordWrap: "on",
+          }
-        scrollBeyondLastLine: false,
+          setConflictMessage("Manual resolution updated. Apply it to save the resolved document.");
-        padding: { top: 12 },
+        },
-        renderLineHighlight: "line",
-        smoothScrolling: true,
-        cursorBlinking: "smooth",
-        cursorSmoothCaretAnimation: "on",
-        bracketPairColorization: { enabled: true },
-        automaticLayout: true,
       });
-
       conflictResolution.hidden = true;
-      conflictResolutionMount.classList.add("monaco-mounted");
-
-      resolutionEditor.onDidChangeModelContent(function () {
-        if (suppressResolutionEvents) {
-          return;
-        }
-        resolvedConflictContent = resolutionEditor.getValue();
-        conflictResolution.value = resolvedConflictContent;
-        if (conflictApply) {
-          conflictApply.disabled = false;
-        }
-        setConflictMessage("Manual resolution updated. Apply it to save the resolved document.");
-      });
-
       resolutionEditor.focus();
     }).catch(function () {
       conflictResolution.hidden = false;
     });
   }
 
-  if (monacoContainer) {
+  if (codeMirrorContainer) {
-    loadMonaco().catch(function () {
+    loadCodeMirror().then(function () {
+      editor = createCodeMirrorEditor(codeMirrorContainer, textarea.value, {
+        onChange: function (value) {
+          textarea.value = value;
+          scheduleSave();
+        },
+      });
+      textarea.hidden = true;
+      editor.focus();
+    }).catch(function () {
       textarea.addEventListener("input", scheduleSave);
     });
   } else {
@@ -582,59 +670,10 @@
 
   restorePendingConflict();
 
-  var doneLink = document.querySelector("[data-done-link]");
-  var isSaving = false;
-
   if (doneLink) {
     doneLink.addEventListener("click", function (event) {
-      var currentValue = getEditorValue();
-      var href = doneLink.getAttribute("href");
-
-      // If there's an unresolved conflict, warn the user
-      if (currentConflict) {
-        event.preventDefault();
-        setStatus("Conflict");
-        if (conflictNotice) {
-          conflictNotice.scrollIntoView({ behavior: "smooth", block: "center" });
-        }
-        return;
-      }
-
-      // If nothing changed, allow normal navigation
-      if (currentValue === lastSavedValue) {
-        return;
-      }
-
-      // Unsaved changes — cancel any pending timer and save immediately
       event.preventDefault();
-
+      saveThenLeaveEditor();
-      if (saveTimer) {
-        clearTimeout(saveTimer);
-        saveTimer = null;
-      }
-
-      if (isSaving) {
-        // Already saving, just wait and then navigate
-        waitForSaveThenNavigate(href);
-        return;
-      }
-
-      isSaving = true;
-      setStatus("Saving");
-
-      saveNow()
-        .then(function () {
-          isSaving = false;
-          window.location.href = href;
-        })
-        .catch(function () {
-          isSaving = false;
-          setStatus("Queued");
-          // If save fails, ask user if they want to leave anyway
-          if (window.confirm("Could not save. Leave without saving?")) {
-            window.location.href = href;
-          }
-        });
     });
   }
 
@@ -642,6 +681,14 @@
     var checkInterval = setInterval(function () {
       if (!isSaving) {
         clearInterval(checkInterval);
+        if (currentConflict) {
+          setStatus("Conflict");
+          if (conflictNotice) {
+            conflictNotice.scrollIntoView({ behavior: "smooth", block: "center" });
+          }
+          return;
+        }
+        suppressBeforeUnload = true;
         window.location.href = href;
       }
     }, 100);
@@ -653,15 +700,42 @@
 
   // Warn on browser unload if there are unsaved changes
   window.addEventListener("beforeunload", function (e) {
+    if (suppressBeforeUnload) {
+      return;
+    }
     if (getEditorValue() !== lastSavedValue || currentConflict) {
       e.preventDefault();
       e.returnValue = "";
     }
   });
 
+  function editorSurfaceHasFocus(target) {
+    if (!target) {
+      return false;
+    }
+    if (target === textarea || target.closest("[data-codemirror-mount], [data-conflict-codemirror-mount], [data-document-editor], .cm-editor")) {
+      return true;
+    }
+    return Boolean(editor && editor.hasTextFocus && editor.hasTextFocus());
+  }
+
   document.addEventListener("keydown", function (e) {
     if ((e.metaKey || e.ctrlKey) && e.key === "s") {
       e.preventDefault();
+      saveNow().catch(function () {
+        setStatus("Queued");
+      });
+      return;
     }
-  });
+
+    if (e.metaKey && e.key === "Enter") {
+      e.preventDefault();
+      saveThenLeaveEditor();
+      return;
+    }
+
+    if (!editorSurfaceHasFocus(e.target)) {
+      return;
+    }
+  }, true);
 })();

apps/server/internal/httpserver/static/keyboard-nav.js

@@ -0,0 +1,471 @@
+(function () {
+  "use strict";
+
+  if (document.querySelector("[data-editor-form]")) {
+    return;
+  }
+
+  var browser = document.querySelector(".miller-browser");
+  if (!browser) {
+    return;
+  }
+
+  var documentShell = document.querySelector(".document-shell[data-document-path]");
+  var markdownBody = document.querySelector(".markdown-body");
+  var mode = "browser";
+  var selectedColumnIndex = 0;
+  var selectedLink = null;
+  var selectedParagraphIndex = -1;
+
+  function getColumns() {
+    return Array.prototype.slice.call(browser.querySelectorAll(".miller-column"));
+  }
+
+  function getColumnLinks(columnIndex) {
+    var columns = getColumns();
+    if (!columns[columnIndex]) {
+      return [];
+    }
+    return Array.prototype.slice.call(columns[columnIndex].querySelectorAll("a[href]"));
+  }
+
+  function getParagraphTargets() {
+    if (!markdownBody) {
+      return [];
+    }
+    return Array.prototype.slice.call(
+      markdownBody.querySelectorAll(".commentable, p, h1, h2, h3, h4, h5, h6, li, blockquote, pre")
+    ).filter(function (el) {
+      return (el.textContent || "").trim().length > 0;
+    });
+  }
+
+  function clamp(value, min, max) {
+    return Math.max(min, Math.min(max, value));
+  }
+
+  function isEditableTarget(target) {
+    if (!target) {
+      return false;
+    }
+    return Boolean(target.closest(
+      "input, textarea, select, [contenteditable='true'], [contenteditable=''], [role='textbox'], .monaco-editor"
+    ));
+  }
+
+  function isKeyboardNavigationTarget(target) {
+    if (!target) {
+      return false;
+    }
+    return Boolean(target.closest(".miller-browser a[href], .markdown-body .is-keyboard-selected"));
+  }
+
+  function shouldIgnoreTarget(target) {
+    if (isEditableTarget(target)) {
+      return true;
+    }
+    if (isKeyboardNavigationTarget(target)) {
+      return false;
+    }
+    return Boolean(target && target.closest("a[href], button, summary, details, [role='button'], [role='menuitem']"));
+  }
+
+  function showKeyboardUI() {
+    document.body.classList.add("keyboard-navigation-active");
+  }
+
+  function clearBrowserSelection() {
+    browser.querySelectorAll(".is-keyboard-selected").forEach(function (node) {
+      node.classList.remove("is-keyboard-selected");
+      node.removeAttribute("aria-selected");
+    });
+  }
+
+  function clearParagraphSelection() {
+    getParagraphTargets().forEach(function (node) {
+      node.classList.remove("is-keyboard-selected");
+      node.removeAttribute("tabindex");
+      node.removeAttribute("aria-selected");
+    });
+  }
+
+  function scrollBrowserColumnIntoView(column) {
+    if (!column) {
+      return;
+    }
+    var leftEdge = column.offsetLeft;
+    var rightEdge = leftEdge + column.offsetWidth;
+    var targetLeft = browser.scrollLeft;
+
+    if (leftEdge < browser.scrollLeft) {
+      targetLeft = leftEdge - 8;
+    } else if (rightEdge > browser.scrollLeft + browser.clientWidth) {
+      targetLeft = rightEdge - browser.clientWidth + 8;
+    }
+
+    if (targetLeft !== browser.scrollLeft) {
+      browser.scrollTo({ left: Math.max(0, targetLeft), behavior: "smooth" });
+    }
+  }
+
+  function expandColumnForKeyboard(column) {
+    getColumns().forEach(function (candidate) {
+      if (candidate !== column) {
+        candidate.classList.remove("is-preview-expanded");
+        candidate.style.removeProperty("--expanded-column-width");
+      }
+    });
+
+    if (!column || !column.matches(".miller-column:not(:first-child):not(:last-child)")) {
+      return;
+    }
+
+    var expandedWidth = Math.min(Math.max(column.scrollWidth + 12, 192), 384);
+    column.style.setProperty("--expanded-column-width", expandedWidth + "px");
+    column.classList.add("is-preview-expanded");
+  }
+
+  function updateBrowserSelection(focusSelected) {
+    clearBrowserSelection();
+    var columns = getColumns();
+    var column = columns[selectedColumnIndex];
+    if (!column) {
+      return;
+    }
+
+    expandColumnForKeyboard(column);
+    scrollBrowserColumnIntoView(column);
+
+    if (!selectedLink || !column.contains(selectedLink)) {
+      selectedLink = column.querySelector("a.is-active[href]") || column.querySelector("a[href]");
+    }
+    if (!selectedLink) {
+      return;
+    }
+
+    selectedLink.classList.add("is-keyboard-selected");
+    selectedLink.setAttribute("aria-selected", "true");
+    if (focusSelected) {
+      selectedLink.focus({ preventScroll: true });
+    }
+  }
+
+  function selectBrowserColumn(columnIndex, focusSelected) {
+    var columns = getColumns();
+    if (!columns.length) {
+      return;
+    }
+
+    mode = "browser";
+    selectedColumnIndex = clamp(columnIndex, 0, columns.length - 1);
+    var links = getColumnLinks(selectedColumnIndex);
+    selectedLink = links.find(function (link) {
+      return link.classList.contains("is-active");
+    }) || links[0] || null;
+    clearParagraphSelection();
+    updateBrowserSelection(focusSelected);
+  }
+
+  function moveBrowserVertical(delta) {
+    var links = getColumnLinks(selectedColumnIndex);
+    if (!links.length) {
+      return;
+    }
+
+    var currentIndex = links.indexOf(selectedLink);
+    if (currentIndex < 0) {
+      currentIndex = links.findIndex(function (link) {
+        return link.classList.contains("is-active");
+      });
+    }
+    if (currentIndex < 0) {
+      currentIndex = 0;
+    }
+
+    selectedLink = links[clamp(currentIndex + delta, 0, links.length - 1)];
+    updateBrowserSelection(true);
+  }
+
+  function navigateTo(link) {
+    if (!link || !link.href) {
+      return;
+    }
+    window.location.href = link.href;
+  }
+
+  function moveBrowserRight() {
+    var columns = getColumns();
+    if (!columns.length) {
+      return;
+    }
+
+    if (selectedColumnIndex < columns.length - 1 && selectedLink && selectedLink.classList.contains("is-active")) {
+      selectBrowserColumn(selectedColumnIndex + 1, true);
+      return;
+    }
+
+    if (selectedColumnIndex < columns.length - 1 && !selectedLink) {
+      selectBrowserColumn(selectedColumnIndex + 1, true);
+      return;
+    }
+
+    if (selectedLink && !selectedLink.classList.contains("is-active")) {
+      navigateTo(selectedLink);
+      return;
+    }
+
+    if (markdownBody && getParagraphTargets().length) {
+      enterParagraphMode(0);
+    } else if (selectedLink) {
+      navigateTo(selectedLink);
+    }
+  }
+
+  function nearestParagraphIndex() {
+    var targets = getParagraphTargets();
+    if (!targets.length) {
+      return -1;
+    }
+    if (selectedParagraphIndex >= 0 && selectedParagraphIndex < targets.length) {
+      return selectedParagraphIndex;
+    }
+
+    var shellRect = documentShell ? documentShell.getBoundingClientRect() : null;
+    var targetY = shellRect ? shellRect.top + shellRect.height * 0.35 : window.innerHeight * 0.35;
+    var bestIndex = 0;
+    var bestDistance = Number.POSITIVE_INFINITY;
+    targets.forEach(function (el, index) {
+      var distance = Math.abs(el.getBoundingClientRect().top - targetY);
+      if (distance < bestDistance) {
+        bestDistance = distance;
+        bestIndex = index;
+      }
+    });
+    return bestIndex;
+  }
+
+  function selectParagraph(index) {
+    var targets = getParagraphTargets();
+    if (!targets.length) {
+      return;
+    }
+
+    clearBrowserSelection();
+    clearParagraphSelection();
+    mode = "paragraph";
+    selectedParagraphIndex = clamp(index, 0, targets.length - 1);
+
+    var target = targets[selectedParagraphIndex];
+    target.classList.add("is-keyboard-selected");
+    target.setAttribute("aria-selected", "true");
+    target.setAttribute("tabindex", "-1");
+    target.focus({ preventScroll: true });
+    target.scrollIntoView({ block: "nearest", behavior: "smooth" });
+  }
+
+  function enterParagraphMode(offset) {
+    var index = nearestParagraphIndex();
+    if (index < 0) {
+      return;
+    }
+    selectParagraph(index + offset);
+  }
+
+  function moveParagraphVertical(delta) {
+    var targets = getParagraphTargets();
+    if (!targets.length) {
+      return;
+    }
+    var currentIndex = selectedParagraphIndex;
+    if (currentIndex < 0 || currentIndex >= targets.length) {
+      currentIndex = nearestParagraphIndex();
+    }
+    selectParagraph(currentIndex + delta);
+  }
+
+  function openSelectedParagraphInEditor() {
+    var editLink = document.querySelector(".document-actions-dropdown__item[href$='/edit']");
+    if (editLink) {
+      navigateTo(editLink);
+      return;
+    }
+    var path = documentShell ? documentShell.getAttribute("data-document-path") : "";
+    if (!path) {
+      return;
+    }
+    window.location.href = "/docs/" + path.replace(/\.md$/, "") + "/edit";
+  }
+
+  function focusSearch() {
+    var search = document.querySelector(".site-search input[type='search'], .site-search input[name='q']");
+    if (!search) {
+      return;
+    }
+    clearBrowserSelection();
+    clearParagraphSelection();
+    search.focus();
+    search.select();
+  }
+
+  function focusCommentsSidebar() {
+    var desktopToggle = document.querySelector("[data-comment-toggle]");
+    if (desktopToggle && desktopToggle.getAttribute("aria-pressed") === "false") {
+      desktopToggle.click();
+    }
+
+    var mobileToggle = document.querySelector("[data-toggle-comments]");
+    if (mobileToggle && window.matchMedia("(max-width: 760px)").matches && mobileToggle.getAttribute("aria-expanded") === "false") {
+      mobileToggle.click();
+    }
+
+    var focusTarget = document.querySelector("[data-comments-aside-list] .comments-aside-item") ||
+      document.querySelector("[data-comments-aside-list]") ||
+      document.querySelector("[data-comments-aside]");
+    if (!focusTarget) {
+      return;
+    }
+
+    clearBrowserSelection();
+    clearParagraphSelection();
+    focusTarget.setAttribute("tabindex", "-1");
+    focusTarget.focus({ preventScroll: false });
+  }
+
+  function focusDocumentActions() {
+    var dropdown = document.querySelector(".document-actions-dropdown");
+    if (!dropdown) {
+      return;
+    }
+
+    dropdown.open = true;
+    var focusTarget = dropdown.querySelector(".document-actions-dropdown__item[href], .document-actions-dropdown__item:not([disabled])") ||
+      dropdown.querySelector("summary");
+    if (!focusTarget) {
+      return;
+    }
+
+    clearBrowserSelection();
+    clearParagraphSelection();
+    focusTarget.focus();
+  }
+
+  function closeDocumentActions() {
+    var dropdown = document.querySelector(".document-actions-dropdown[open]");
+    if (dropdown) {
+      dropdown.open = false;
+      var summary = dropdown.querySelector("summary");
+      if (summary) {
+        summary.focus();
+      }
+      return true;
+    }
+    return false;
+  }
+
+  function handleEnter() {
+    if (mode === "paragraph") {
+      openSelectedParagraphInEditor();
+      return;
+    }
+    navigateTo(selectedLink);
+  }
+
+  function handleKeydown(event) {
+    if (event.defaultPrevented || event.ctrlKey || event.metaKey || event.altKey || shouldIgnoreTarget(event.target)) {
+      return;
+    }
+
+    var key = event.key;
+    var normalized = key.length === 1 ? key.toLowerCase() : key;
+
+    if (event.code === "Backslash" || key === "\\") {
+      event.preventDefault();
+      focusSearch();
+      return;
+    }
+
+    if (normalized === "c") {
+      event.preventDefault();
+      focusCommentsSidebar();
+      return;
+    }
+
+    if (normalized === "e") {
+      event.preventDefault();
+      focusDocumentActions();
+      return;
+    }
+
+    if (key === "Escape" && closeDocumentActions()) {
+      event.preventDefault();
+      return;
+    }
+
+    if (key === "ArrowUp" || normalized === "k") {
+      event.preventDefault();
+      showKeyboardUI();
+      if (mode === "paragraph") {
+        moveParagraphVertical(-1);
+      } else {
+        moveBrowserVertical(-1);
+      }
+      return;
+    }
+
+    if (key === "ArrowDown" || normalized === "j") {
+      event.preventDefault();
+      showKeyboardUI();
+      if (mode === "paragraph") {
+        moveParagraphVertical(1);
+      } else {
+        moveBrowserVertical(1);
+      }
+      return;
+    }
+
+    if (key === "ArrowLeft" || normalized === "h") {
+      event.preventDefault();
+      showKeyboardUI();
+      if (mode === "paragraph") {
+        selectBrowserColumn(getColumns().length - 1, true);
+      } else {
+        selectBrowserColumn(selectedColumnIndex - 1, true);
+      }
+      return;
+    }
+
+    if (key === "ArrowRight" || normalized === "l") {
+      event.preventDefault();
+      showKeyboardUI();
+      if (mode === "paragraph") {
+        return;
+      }
+      moveBrowserRight();
+      return;
+    }
+
+    if (key === "Enter") {
+      event.preventDefault();
+      showKeyboardUI();
+      handleEnter();
+    }
+  }
+
+  function initSelection() {
+    var columns = getColumns();
+    if (!columns.length) {
+      return;
+    }
+
+    var activeLinks = Array.prototype.slice.call(browser.querySelectorAll("a.is-active[href]"));
+    var activeLink = activeLinks[activeLinks.length - 1] || browser.querySelector("a[href]");
+    selectedLink = activeLink;
+    if (activeLink) {
+      var activeColumn = activeLink.closest(".miller-column");
+      selectedColumnIndex = Math.max(0, columns.indexOf(activeColumn));
+    }
+  }
+
+  initSelection();
+  document.addEventListener("keydown", handleKeydown);
+})();

apps/server/internal/httpserver/static/site.css

@@ -1540,11 +1540,17 @@ code {
 }
 
 .miller-column a:hover,
-.miller-column a.is-active {
+.miller-column a.is-active,
+.keyboard-navigation-active .miller-column a.is-keyboard-selected {
   background: var(--accent-soft);
   color: var(--accent);
 }
 
+.keyboard-navigation-active .miller-column a.is-keyboard-selected {
+  outline: 2px solid color-mix(in srgb, var(--accent) 70%, transparent);
+  outline-offset: -2px;
+}
+
 .browser-item-name {
   overflow: hidden;
   text-overflow: ellipsis;
@@ -2080,7 +2086,7 @@ code {
   display: none;
 }
 
-[data-monaco-mount] {
+[data-codemirror-mount] {
   display: none;
   width: 100%;
   min-height: 60vh;
@@ -2089,7 +2095,7 @@ code {
   overflow: hidden;
 }
 
-[data-monaco-mount].monaco-mounted {
+[data-codemirror-mount].codemirror-mounted {
   display: block;
 }
 
@@ -2105,26 +2111,31 @@ code {
   font: 400 0.98rem/1.6 ui-monospace, SFMono-Regular, monospace;
 }
 
-[data-monaco-mount].monaco-mounted ~ textarea {
+[data-codemirror-mount].codemirror-mounted ~ textarea {
   display: none;
 }
 
-@keyframes monaco-shimmer {
+@keyframes codemirror-shimmer {
   0% { background-position: -200% 0; }
   100% { background-position: 200% 0; }
 }
 
-[data-monaco-mount]:not(.monaco-mounted) {
+[data-codemirror-mount]:not(.codemirror-mounted) {
   display: flex;
   align-items: center;
   justify-content: center;
   background: linear-gradient(90deg, var(--panel-strong) 25%, var(--panel) 50%, var(--panel-strong) 75%);
   background-size: 200% 100%;
-  animation: monaco-shimmer 1.5s ease infinite;
+  animation: codemirror-shimmer 1.5s ease infinite;
   color: var(--muted);
   font-size: 0.85rem;
 }
 
+[data-codemirror-mount] .cm-editor,
+[data-conflict-codemirror-mount] .cm-editor {
+  height: 100%;
+}
+
 .editor-status {
   display: inline-block;
   min-width: 5.5rem;
@@ -2290,7 +2301,7 @@ code {
   padding: 0.75rem;
 }
 
-[data-conflict-monaco-mount] {
+[data-conflict-codemirror-mount] {
   display: none;
   width: 100%;
   min-height: 18rem;
@@ -2300,11 +2311,11 @@ code {
   overflow: hidden;
 }
 
-[data-conflict-monaco-mount].monaco-mounted {
+[data-conflict-codemirror-mount].codemirror-mounted {
   display: block;
 }
 
-[data-conflict-monaco-mount].monaco-mounted + textarea {
+[data-conflict-codemirror-mount].codemirror-mounted + textarea {
   display: none;
 }
 
@@ -2833,7 +2844,7 @@ code {
     color: var(--text);
   }
 
-  [data-conflict-monaco-mount] {
+  [data-conflict-codemirror-mount] {
     border-color: oklch(0.55 0.18 25 / 0.3);
     background: oklch(0.14 0.012 55);
   }
@@ -2913,10 +2924,17 @@ code {
   position: relative;
 }
 
-.commentable:hover {
+.commentable:hover,
+.keyboard-navigation-active .commentable.is-keyboard-selected,
+.keyboard-navigation-active .markdown-body .is-keyboard-selected {
   background: var(--accent-soft);
 }
 
+.keyboard-navigation-active .markdown-body .is-keyboard-selected {
+  outline: 2px solid color-mix(in srgb, var(--accent) 68%, transparent);
+  outline-offset: 0.25rem;
+}
+
 .comment-anchor-btn {
   position: absolute;
   right: -1.5rem;

apps/server/internal/httpserver/static/sw.js

@@ -1,4 +1,4 @@
-const STATIC_CACHE = "md-hub-static-v2";
+const STATIC_CACHE = "md-hub-static-v6";
 const DB_NAME = "md-hub-cache";
 const DB_VERSION = 3;
 const STORE_PAGES = "pages";
@@ -8,7 +8,9 @@ const STATIC_ASSETS = [
   "/static/sync.js",
   "/static/realtime.js",
   "/static/editor.js",
+  "/static/codemirror.bundle.js",
   "/static/render.js",
+  "/static/keyboard-nav.js",
   "/static/tags.js",
   "/static/favicon.png",
   "/static/cairnquire%20logo%402x.webp",

apps/server/internal/httpserver/templates/base.gohtml

@@ -111,6 +111,7 @@
   <script src="/static/auth.js" defer></script>
   <script src="/static/render.js" defer></script>
   <script src="/static/comments.js" defer></script>
+  <script src="/static/keyboard-nav.js" defer></script>
   <script src="/static/mobile.js" defer></script>
   <script src="/static/archive.js" defer></script>
   <script src="/static/permissions.js" defer></script>

apps/server/internal/httpserver/templates/document_edit.gohtml

@@ -70,7 +70,7 @@
         <div class="editor-conflict__diff" data-conflict-diff></div>
         <div class="editor-conflict__resolution">
           <label for="conflict-resolution">Resolved document</label>
-          <div data-conflict-monaco-mount></div>
+          <div data-conflict-codemirror-mount></div>
           <textarea id="conflict-resolution" data-conflict-resolution spellcheck="false"></textarea>
         </div>
       </div>
@@ -78,7 +78,7 @@
 
     <form class="editor-form" data-editor-form data-document-path="{{ .Path }}">
       <label class="sr-only" for="document-editor">Markdown editor</label>
-      <div data-monaco-mount></div>
+      <div data-codemirror-mount></div>
       <textarea id="document-editor" name="content" data-document-editor spellcheck="false">{{ .Source }}</textarea>
     </form>
   </article>