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dsh-file-panel-left

A "files-only workbench" sidebar for DSH Web — file explorer, editor, and previewer in one panel. Left tree, right content: browse, edit, reference, and open files from the chat, all in a single surface.

It is a trimmed-down fork of the community plugin dsh-better-sidebar by omdsh-dev, keeping only file-related capabilities (file tree / editor / preview / @-references / opening chat files) and removing everything unrelated: terminal, browser, Git, task management, tabs, downloads, and the plugin market. Formerly named dsh_left_bar, renamed and released independently in 2026.

中文简介：DeepSeek Harness Web 的「纯文件工作台」左侧边栏插件 —— 文件资源管理器、编辑器、预览器一体，左树右内容，支持 @引用与聊天文件打开，按会话隔离。精简自社区插件 dsh-better-sidebar（作者 omdsh-dev，仓库，MIT 许可），只保留文件相关能力（文件树 / 编辑器 / 预览 / @引用 / 聊天文件打开），已删除终端、浏览器、Git、任务管理、标签栏、下载与插件市场。完整中文文档见 README.zh-CN.md。

Features

A files-only workbench

• Split layout with the file tree always docked on the left (search / refresh / @-reference) and opened files on the right; a placeholder shows until a file is selected
• Terminal, browser, Git, task management, tab bar, downloads, and plugin market are removed to keep the focus on file work

File tree

• Lazy directory loading (one level at a time) — large folders stay responsive
• Symlink support: link targets are resolved to their real kind, and broken links are flagged
• UNC network paths work
• Global file-name search (300 ms debounce, abortable); truncated results are reported
• Refresh button; a tree-header “+” and a row-hover “+” create new files (inline input, Enter to create / Esc to cancel; new files are not auto-opened)
• Single click opens a file; clicking blank space selects a directory (as the target for new files), with selection highlighting
• Right-click to copy relative or absolute paths

CodeMirror 6 editor

• Syntax highlighting for 20+ languages: JS/TS/JSX, JSON, Python, HTML, CSS, Markdown, XML, YAML, SQL, Java, C/C++, C#, Kotlin, Swift, Rust, Go, PHP, Shell, TOML, INI, nginx, Dockerfile, properties, and more (including a custom INI highlighter)
• Ctrl/Cmd+F search panel, bracket matching, code folding, auto-indent, active-line highlighting, Alt+drag column selection
• One-click JSON/JSONC formatting (Ctrl/Cmd+Shift+F)
• Ctrl/Cmd+S to save; an auto-save poller also writes every second (only when there are unsaved changes)

6 built-in file viewers

• Image / PDF / Markdown / HTML / Code (catch-all) / binary notice
• Markdown has preview and edit modes; previews render Mermaid diagrams
• HTML previews run inside a sandboxed iframe (no access to GUI data or local files) with a “Refresh preview” button
• Oversized files are truncated (first 512 KB shown); unsupported binary types get a clear notice

@-references

• Select code in the editor, release the mouse, and the “Add to conversation” popup inserts a pure reference line @relative/path L12-L25 (no selection text copied — token-friendly; a single-line selection becomes @path L12, and unresolved references fall back to a bare @path)
• Line numbers are trustworthy: the edit mode reads them straight from CodeMirror; the preview mode uses two-level back-matching and would rather fall back to a bare reference than emit wrong numbers
• The draft shows a blue capsule while the full @path Lxx text is preserved in the draft and clipboard, so the model always reads it
• Ships a file-line-reading skill that teaches the AI to read only the referenced line range

Context menu

• Copy relative path / copy absolute path / rename / delete
• Rename pre-checks for duplicates and invalid characters; delete asks for confirmation and moves to the system Recycle Bin / Trash (Windows / macOS); the session root cannot be deleted

Smart layout

• Collapse/expand button: every expand action (button, opening a file from the chat, opening a file) restores 65% of the viewport width for comfortable reading
• The content-area “Close” (X) button collapses the display page and narrows the panel to just the tree; selecting a file again restores 65%
• Both the panel width and the tree-column width are draggable (tree column 240–480 px, default 280 px) and persisted per session

Chat integration

• File links in the chat (tool rows, the produced-files row, prose mentions) open in the sidebar instead of the system default app
• The “Produced” row is intercepted: files a tool produced are shown as chips and open in the sidebar on click

Extensibility & localization

• External plugins can register sidebar tabs and file viewers through the ctx.betterSidebar service
• UI copy is bilingual (Chinese/English) and follows the DSH language setting live
• Session isolation: each conversation has its own working directory and panel state; layout preferences persist

Platform fit

• Windows title-bar compatibility mode (reserves space for the native title bar in frameless windows)
• Deployments without a settings service fall back to ~/.dsh/dsh-file-panel-left-prefs.json for preferences

Installation

> Requirements: Node.js ≥ 20 and DSH Web (with the dsh CLI). Peer dependencies (React 18, Cordis, and the @deepseek-ai/dsh-* family) are provided by the DSH runtime — nothing to install manually.

Published release (npm)

dsh plugin --profile web add dsh-file-panel-left

• One command installs and mounts the plugin: the bundle patch declared in the package (cordis.patch.yml) makes the CLI register it in the profile's bundle stack automatically — no config file edits
• After installation, restart DSH and hard-refresh the browser (Ctrl+Shift+R / Cmd+Shift+R) to see the sidebar
• Pin a version: dsh plugin --profile web add dsh-file-panel-left@<version>
• Uninstall: dsh plugin --profile web remove dsh-file-panel-left
• If the profile previously mounted the plugin manually (a mount line in its cordis.patch.yml), remove that line before switching to the CLI channel to avoid double-mounting (two sidebars)

Local development (file: dependency)

Add the local dependency in the profile directory (e.g. ~/.dsh/profiles/web) package.json:

"dependencies": {
  "dsh-file-panel-left": "file:<local-path>/dsh-file-panel-left"
}

Mount the plugin row in the profile's cordis.patch.yml (choose this or the CLI channel — not both):

- insert:
    - id: dsh-file-panel-left
      name: 'dsh-file-panel-left'

Then install:

cd ~/.dsh/profiles/web
pnpm install

Note: pnpm file: dependencies are copied, not symlinked. After every source change, delete the stale copy under node_modules/dsh-file-panel-left in the profile and reinstall, or the browser keeps loading the old build:

Remove-Item -LiteralPath "$env:USERPROFILE\.dsh\profiles\web\node_modules\dsh-file-panel-left" -Recurse -Force
cd $env:USERPROFILE\.dsh\profiles\web; pnpm install

Usage

• File tree: single-click a file to open it; use the tree-header or folder-row “+” to create files (Enter creates / Esc cancels); the search box filters by name; right-click a row to copy its path, rename, or delete
• Editor: code and config files open in the CodeMirror editor; Ctrl/Cmd+S saves and the auto-save poller writes every second; Ctrl/Cmd+F searches; code/config files get folding, bracket matching, and column selection; JSON files show a format button (Ctrl/Cmd+Shift+F)
• Preview: Markdown files toggle between Preview and Edit (Mermaid diagrams render in preview); HTML files render in a sandboxed iframe with a refresh control; images and PDFs preview directly; unsupported binary types show a notice
• Context menu: copy relative path, copy absolute path, rename (duplicates are rejected), delete (confirmed, then moved to the Recycle Bin)
• @-reference: select code in the editor and release the mouse, then click “Add to conversation” in the popup — the draft gets a blue @relative/path L12-L25 capsule; the tree's “@file” button references a whole file in one click

Configuration

The plugin has no settings page — behavior is built-in by design:

• Expanding the panel = 65% of the viewport width (drag to fine-tune; remembered per session)
• Auto-save: polls every 1 second, writes only when there are unsaved changes; cannot be disabled
• Chat file-open interception: always on (tool rows, produced files, mentions all open in the sidebar); no toggle
• Delete: confirmed, then moved to the system Recycle Bin / Trash (Windows 10/11 and macOS)
• HTML preview: sandboxed by default (no access to GUI data or local files)
• Preferences (e.g. title-bar compatibility) persist through the settings service; deployments without one fall back to a local file

Platform support

Known limitations

• Files are classified by extension and a NUL-byte probe of the head: UTF-16 / UTF-32 encoded text is reported as binary (the head contains 0x00 bytes) and shows the binary notice instead of the editor — re-encode as UTF-8 to view it. Detect-by-encoding would require reading the whole file first.

Development

pnpm install
pnpm build        # type-checked build via tsc, then bundled by tsdown into lib/
pnpm typecheck    # type-check only (tsc --noEmit)

Iteration loop: pnpm build → force-sync into the profile (see “Local development”) → restart DSH for host changes, hard-refresh the browser for client changes → verify in the browser.

Tech stack & architecture

• Host (Node): a Cordis plugin exposing API routes for file tree / read / write / search / Recycle-Bin delete / rename, plus preference persistence (settings service or local-file fallback)
• Client (browser): React 18 + CSS Modules; file tree, split layout, and the viewer registry
• Editor: CodeMirror 6, with language packages and extensions loaded on demand
• Lazy chunks: heavy modules (Mermaid, the editor) are loaded as chunks only when the first matching file is opened
• Service base: the ctx.betterSidebar service lets external plugins register tabs and viewers
• i18n: wired to the DSH locale service — Chinese/English, switching live
• Session isolation: per-conversation working directory and panel state; preferences persist in localStorage (key dsh_left_bar:v1)

License

[MIT](./LICENSE)

Credits

A trimmed-down fork of the community plugin dsh-better-sidebar by omdsh-dev (DSH-better-sidebar, MIT license — previously named dsh_left_bar, renamed in 2026). Thanks to the upstream design and implementation; the upstream copyright notice is retained in [LICENSE](./LICENSE).