dsh-composer-enter

A DeepSeek Harness (DSH) web plugin that lets you remap how the Enter key behaves in the chat composer — pick which key combination sends the message, which one inserts a newline, and which one triggers the interject (queue / steer) action.

The plugin is shipped as a two-sided DSH plugin: a host (Node) half that owns the settings namespace and a loopback RPC channel, and a browser half that renders the key-mapping row in Settings → General and intercepts Enter at the document capture phase.

🌏 中文版本 / Chinese version is also available.

---

Features

• Settings row in General settings with three key recorders: Send message, Insert newline, Interject (other).
• Persistent configuration stored in <dsh home>/settings.yaml under the namespace ui-composer-enter. Edit the file directly and the UI refreshes on save.
• Document-capture Enter interceptor that runs before React's listeners, with full respect for IME composition (isComposing / keyCode 229) and readonly states.
• Invariant enforcement: send and newline are always complementary (exactly one of them is plain Enter); the interject key is always a distinct combination. Conflicting selections are auto-corrected.
• Zero changes to DSH core — installed as an ordinary plugin, survives @deepseek-ai/dsh updates.

---

Installation

dsh plugin --profile web add dsh-composer-enter

After installation, restart dsh web. The new row "回车键映射" / "Enter key mapping" will appear in Settings → General.

To install from a local checkout:

dsh plugin --profile web add /path/to/dsh-composer-enter

---

Configuration

The namespace ui-composer-enter exposes three fields, all matching ^(?:enter|(shift|ctrl|alt|meta)(\+(shift|ctrl|alt|meta))*+enter)$:

Field	Default	Meaning
sendCombo	enter	The combination that sends the message.
newlineCombo	shift+enter	The combination that inserts a newline into the composer.
steerCombo	ctrl+enter	The combination that interjects / flushes queued messages. Must differ from both above and may not be plain Enter.

You can change these in the Settings UI, or by hand in settings.yaml:

ui-composer-enter:
  sendCombo: enter
  newlineCombo: shift+enter
  steerCombo: ctrl+enter

The plugin watches settings/document-updated and reloads automatically whenever the file changes.

---

How the interceptor works

When the mapping matches the app default (enter / shift+enter / ctrl+enter) the plugin does not intercept at all — DSH's native handling is preserved.

For any other mapping:

• The interject combination is translated into a synthesized Ctrl+Enter keydown so the app's built-in busy/queue logic fires identically.
• The send combination is translated into a synthesized plain Enter, again preserving the app's overlay/queue arbitration.
• All other Enter variants are turned into a newline (document.execCommand('insertText', false, '\n')).

Synthesis uses a dispatching flag to prevent the synthesized event from re-entering the same handler. Listeners run in the capture phase and call stopPropagation(), so they beat any root-container listener. IME composition and readonly composers are never intercepted.

---

Repository layout

composer-enter/
├── cordis.patch.yml       # bundle patch: insert the composer-enter row
├── lib/
│   ├── index.js           # host half (Node): settings namespace + /composer-enter RPC
│   └── client.js          # browser half: settings row + Enter interceptor
├── package.json
├── pnpm-workspace.yaml
├── pnpm-lock.yaml
└── README.md

The cordis.patch.yml adds a single row to the host composition tree that injects connection so the RPC channel can register itself once the host connection service exists.

---

RPC contract (host half)

Channel: /composer-enter · authority: loopback (non-local callers get 403).

Endpoint	Payload	Returns
get	{}	{ ok: true, value: <resolved namespace> }
set	partial namespace	{ ok: true, value: <resolved namespace> } after merge-persisting to settings.yaml; { ok: false, error } on validation failure.
status	{}	{ ok: true, value: { exitAvailable } } (sanity probe — same shape as dsh-system-control).

The handler reads and writes through the host settings service (dsh-settings-file), bypassing the browser's WEB_SETTINGS_NAMESPACES whitelist — that is the only reason the plugin can own a third-party namespace like ui-composer-enter.

---

Compatibility

• @deepseek-ai/dsh ≥ current web profile (the plugin consumes connection, slots, locale, remote, and the optional settings service).
• Node ≥ 18 (matches DSH host runtime).
• Browser: Chromium-based (the plugin uses KeyboardEvent synthesis and document.execCommand).

---

License

MIT