feat(frontend): add text editor flow and create-file UX

- replace textarea editor with CodeMirror and syntax highlighting\n- integrate editor mode header (save button, hide unused controls)\n- fix breadcrumb/editor navigation behavior and transitions\n- add Create File action with ghost-rename flow and auto-open in editor\n- refine create-file icon shape and plus cutout alignment

frontend/package.json

@@ -18,8 +18,11 @@
     "node": ">=18.0.0"
   },
   "dependencies": {
+    "@codemirror/language-data": "^6.5.2",
+    "@codemirror/theme-one-dark": "^6.1.3",
     "@imengyu/vue3-context-menu": "^1.5.3",
     "@vueuse/core": "^14.1.0",
+    "codemirror": "^6.0.2",
     "esbuild": "^0.27.2",
     "lodash": "^4.17.23",
     "lodash-es": "^4.17.23",

frontend/src/App.vue

@@ -131,7 +131,9 @@ const globalShortcutHandler = (event: KeyboardEvent) => {
   const fileExplorer = store.fileExplorer as any
   if (!fileExplorer) return
   const c = fileExplorer.isCursor()
-  const input = ['INPUT', 'TEXTAREA'].includes((event.target as HTMLElement).tagName)
+  const target = event.target as HTMLElement
+  const input =
+    ['INPUT', 'TEXTAREA'].includes(target.tagName) || !!target.closest('.cm-editor')
   const keyup = event.type === 'keyup'
 
   // Always clear repeat timer on arrow keyup, even if focus moved to input

frontend/src/assets/svg/create-file.svg

@@ -1 +1,3 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><path d="M19.2 2.6H6.1V29h19.8V9.3l-6.7-6.7zm3 15c0 .2-.2.4-.4.4h-4.4v4.4c0 .2-.2.4-.4.4h-2.4c-.2 0-.4-.2-.4-.4V18H9.9c-.2 0-.4-.2-.4-.4v-2.4c0-.2.2-.4.4-.4h4.4v-4.4c0-.2.2-.4.4-.4H17c.2 0 .4.2.4.4v4.4h4.4c.2 0 .4.2.4.4v2.4z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 28 28">
+	<path fill-rule="evenodd" d="M19.2 2.6H6.1V29h19.8V9.3l-6.7-6.7zM22.75 18.55c0 .2625-.175.4375-.4375.4375h-4.55v4.55c0 .2625-.175.4375-.4375.4375h-2.45c-.2625 0-.4375-.175-.4375-.4375v-4.55h-4.55c-.2625 0-.4375-.175-.4375-.4375V16.1c0-.2625.175-.4375.4375-.4375h4.55v-4.55c0-.2625.175-.4375.4375-.4375h2.45c.2625 0 .4375.175.4375.4375v4.55h4.55c.2625 0 .4375.175.4375.4375v2.45z" />
+</svg>

frontend/src/components/FileExplorer.vue

@@ -12,10 +12,10 @@
       </tr>
     </thead>
     <tbody>
-      <tr v-if="editing?.key === 'new'" class="folder">
+      <tr v-if="editing?.key === 'new'" :class="editing.dir ? 'folder' : 'file'">
         <td class="selection"></td>
         <td class="name">
-          <FileRenameInput :doc="editing" :rename="mkdir" :exit="() => {editing = null}" />
+          <FileRenameInput :doc="editing" :rename="createItem" :exit="() => {editing = null}" />
         </td>
         <FileModified :doc=editing :now=nowkey />
         <FileSize :doc=editing />
@@ -206,8 +206,20 @@ const rename = async (doc: Doc, newName: string) => {
   }
 }
 defineExpose({
+  newFile() {
+    const now = Math.floor(Date.now() / 1000)
+    editing.value = new Doc({
+      loc: loc.value,
+      key: 'new',
+      name: 'New File.txt',
+      dir: false,
+      mtime: now,
+      size: 0,
+      allocated: 0
+    })
+    store.cursor = editing.value.key
+  },
   newFolder() {
-    console.log('New folder')
     const now = Math.floor(Date.now() / 1000)
     editing.value = new Doc({
       loc: loc.value,
@@ -350,19 +362,36 @@ onUnmounted(() => {
   keyboardFollowScroll.cancel()
   clearInterval(modifiedTimer)
 })
-const mkdir = async (doc: Doc, name: string) => {
+const editRoute = (path: string) =>
+  '/edit/' +
+  path
+    .split('/')
+    .map(part => encodeURIComponent(part))
+    .join('/')
+
+const createItem = async (doc: Doc, name: string) => {
   doc.name = name
   doc.key = crypto.randomUUID()
   store.addGhost(doc)
   editing.value = null
   const path = doc.loc ? `${doc.loc}/${name}` : name
   try {
-    const res = await apiFetch(filesUrl(path), { method: 'MKCOL' })
+    const res = doc.dir
+      ? await apiFetch(filesUrl(path), { method: 'MKCOL' })
+      : await apiFetch(filesUrl(path), {
+          method: 'PUT',
+          body: '',
+          headers: { 'Content-Type': 'text/plain; charset=utf-8' }
+        })
     if (!res.ok) throw new Error(await parseErrorMessage(res))
-    router.push(doc.urlrouter)
+    if (doc.dir) {
+      router.push(doc.urlrouter)
+    } else {
+      router.push(editRoute(path))
+    }
   } catch (err) {
-    console.error('Mkdir failed', err)
+    console.error('Create failed', err)
-    store.showToast(err instanceof Error ? err.message : 'Mkdir failed')
+    store.showToast(err instanceof Error ? err.message : 'Create failed')
   }
 }
 const showFolderBreadcrumb = (i: number) => {

frontend/src/components/Gallery.vue

@@ -1,6 +1,6 @@
 <template>
   <div v-if="props.documents.length || editing" class="gallery" ref="gallery">
-    <GalleryFigure v-if="editing?.key === 'new'" :doc="editing" :key=editing.key :editing="{rename: mkdir, exit}" />
+    <GalleryFigure v-if="editing?.key === 'new'" :doc="editing" :key=editing.key :editing="{rename: createItem, exit}" />
     <template v-for="(doc, index) in documents" :key=doc.key>
       <BreadCrumb v-if="showFolderBreadcrumb(index)" :path="doc.loc ? doc.loc.split('/') : []" class="folder-indicator"/>
       <GalleryFigure
@@ -260,6 +260,19 @@ const pageMove = (direction: 1 | -1, ev: KeyboardEvent) => {
 }
 
 defineExpose({
+  newFile() {
+    const now = Math.floor(Date.now() / 1000)
+    editing.value = new Doc({
+      loc: loc.value,
+      key: 'new',
+      name: 'New File.txt',
+      dir: false,
+      mtime: now,
+      size: 0,
+      allocated: 0
+    })
+    store.cursor = editing.value.key
+  },
   newFolder() {
     const now = Math.floor(Date.now() / 1000)
     editing.value = new Doc({
@@ -420,19 +433,36 @@ onUnmounted(() => {
 
 // Re-seed aspect ratios whenever docs update (e.g., ar patch from server)
 watch(() => props.documents, seedFromDocs)
-const mkdir = async (doc: Doc, name: string) => {
+const editRoute = (path: string) =>
+  '/edit/' +
+  path
+    .split('/')
+    .map(part => encodeURIComponent(part))
+    .join('/')
+
+const createItem = async (doc: Doc, name: string) => {
   doc.name = name
   doc.key = crypto.randomUUID()
   store.addGhost(doc)
   editing.value = null
   const path = doc.loc ? `${doc.loc}/${name}` : name
   try {
-    const res = await apiFetch(filesUrl(path), { method: 'MKCOL' })
+    const res = doc.dir
+      ? await apiFetch(filesUrl(path), { method: 'MKCOL' })
+      : await apiFetch(filesUrl(path), {
+          method: 'PUT',
+          body: '',
+          headers: { 'Content-Type': 'text/plain; charset=utf-8' }
+        })
     if (!res.ok) throw new Error(await parseErrorMessage(res))
-    router.push(doc.urlrouter)
+    if (doc.dir) {
+      router.push(doc.urlrouter)
+    } else {
+      router.push(editRoute(path))
+    }
   } catch (err) {
-    console.error('Mkdir failed', err)
+    console.error('Create failed', err)
-    store.showToast(err instanceof Error ? err.message : 'Mkdir failed')
+    store.showToast(err instanceof Error ? err.message : 'Create failed')
   }
 }
 const showFolderBreadcrumb = (i: number) => {

frontend/src/components/HeaderMain.vue

@@ -2,6 +2,11 @@
   <nav class="headermain buttons">
     <template v-if="!props.editorMode">
       <UploadButton :path="props.path" />
+      <SvgButton
+        name="create-file"
+        tooltip="New file"
+        @click="() => { store.fileExplorer!.newFile() }"
+      />
       <SvgButton
         name="create-folder"
         tooltip="New folder"

frontend/src/views/TextEditorView.vue

@@ -3,21 +3,22 @@
     <div class="editor-body">
       <div v-if="loading" class="status">Loading…</div>
       <div v-else-if="error" class="status error">{{ error }}</div>
-      <textarea
+      <div v-else ref="editorHost" class="editor-host"></div>
-        v-else
-        ref="textarea"
-        v-model="content"
-        spellcheck="false"
-        @keydown="onKeydown"
-      />
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
+import { indentWithTab } from '@codemirror/commands'
+import { LanguageDescription } from '@codemirror/language'
+import { languages } from '@codemirror/language-data'
+import { Compartment, EditorState } from '@codemirror/state'
+import { oneDark } from '@codemirror/theme-one-dark'
+import { EditorView, keymap } from '@codemirror/view'
+import { basicSetup } from 'codemirror'
 import { apiFetch } from '@/repositories/Client'
 import { useMainStore } from '@/stores/main'
-import { computed, onMounted, onUnmounted, ref } from 'vue'
+import { computed, nextTick, onMounted, onUnmounted, ref } from 'vue'
 import { onBeforeRouteLeave, useRoute } from 'vue-router'
 
 const route = useRoute()
@@ -43,7 +44,9 @@ const original = ref('')
 const loading = ref(true)
 const saving = ref(false)
 const error = ref('')
-const textarea = ref<HTMLTextAreaElement | null>(null)
+const editorHost = ref<HTMLDivElement | null>(null)
+let editorView: EditorView | null = null
+const languageCompartment = new Compartment()
 
 const dirty = computed(() => content.value !== original.value)
 
@@ -62,13 +65,46 @@ const beforeUnload = (event: BeforeUnloadEvent) => {
   event.returnValue = ''
 }
 
-const onKeydown = (ev: KeyboardEvent) => {
+const detectLanguage = async () => {
-  if ((ev.ctrlKey || ev.metaKey) && ev.key === 's') {
+  const language = LanguageDescription.matchFilename(languages, filename.value)
-    ev.preventDefault()
+  if (!language) return []
-    save()
+  try {
+    return [await language.load()]
+  } catch {
+    return []
   }
 }
 
+const initEditor = async (text: string) => {
+  if (!editorHost.value) return
+  const languageExtensions = await detectLanguage()
+  const state = EditorState.create({
+    doc: text,
+    extensions: [
+      basicSetup,
+      oneDark,
+      languageCompartment.of(languageExtensions),
+      EditorView.updateListener.of(update => {
+        if (update.docChanged) {
+          content.value = update.state.doc.toString()
+        }
+      }),
+      keymap.of([
+        {
+          key: 'Mod-s',
+          run: () => {
+            void save()
+            return true
+          }
+        },
+        indentWithTab
+      ])
+    ]
+  })
+  editorView = new EditorView({ state, parent: editorHost.value })
+  editorView.focus()
+}
+
 const save = async () => {
   if (saving.value || loading.value) return
   saving.value = true
@@ -111,10 +147,14 @@ onMounted(async () => {
     const text = await textRes.text()
     content.value = text
     original.value = text
+    loading.value = false
+    await nextTick()
+    await initEditor(text)
   } catch (err) {
     error.value = err instanceof Error ? err.message : 'Failed to load file'
-  } finally {
+  }
-    loading.value = false
+  finally {
+    if (loading.value) loading.value = false
   }
 })
 
@@ -122,6 +162,8 @@ onUnmounted(() => {
   if (store.editorSave === save) {
     store.editorSave = null
   }
+  editorView?.destroy()
+  editorView = null
   window.removeEventListener('beforeunload', beforeUnload)
 })
 </script>
@@ -133,6 +175,7 @@ onUnmounted(() => {
   height: 100%;
   background: #1a1a1a;
   color: #ddd;
+  text-align: left;
 }
 .editor-body {
   flex: 1;
@@ -140,25 +183,40 @@ onUnmounted(() => {
   display: flex;
   flex-direction: column;
 }
-.editor-body textarea {
+.editor-host {
   flex: 1;
-  width: 100%;
+  min-height: 0;
-  resize: none;
+}
+.editor-host :deep(.cm-editor) {
+  flex: 1;
+  height: 100%;
   border: none;
   outline: none;
-  padding: 1rem;
+}
+.editor-host :deep(.cm-scroller) {
   font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
   font-size: 0.875rem;
   line-height: 1.5;
-  background: #1a1a1a;
+  text-align: left;
-  color: #ddd;
-  white-space: pre;
-  overflow-wrap: normal;
-  overflow-x: auto;
 }
-.editor-body textarea::selection {
+.editor-host :deep(.cm-content) {
-  background: var(--accent-color, #007bff);
+  padding: 1rem;
-  color: #000;
+  text-align: left;
+}
+.editor-host :deep(.cm-selectionBackground) {
+  background: var(--soft-color, #146) !important;
+}
+.editor-host :deep(.cm-focused .cm-selectionBackground) {
+  background: var(--soft-color, #146) !important;
+}
+.editor-host :deep(.cm-content ::selection) {
+  background: var(--soft-color, #146);
+}
+.editor-host :deep(.cm-content, .cm-gutter) {
+  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
+}
+.editor-host :deep(.cm-line, .cm-gutters, .cm-gutterElement) {
+  text-align: left;
 }
 .status {
   padding: 2rem;