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.

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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.

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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

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Configuration

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

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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.

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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.

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RPC contract (host half)

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

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.

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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).

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License

MIT