dsh-copy-document-preview

One-click copy button for the DeepSeek Harness sidebar document preview.

The official preview header shows the path, the renderer picker, the wrap toggle and Reload — but nothing that gets the document out of the pane. This plugin adds one button there: click it and the previewed file's text is on your clipboard.

English | 中文

What it does

• A copy button in the document preview header, rendered after the preview's own controls and after Open in app.
• Copies the whole file, not just the part the preview has loaded: the plugin reads the file through the harness's own paged file Remote (remote.workspaceFiles.read), the same reader the preview itself uses, and never bypasses the Session that owns the file.
• Binary files copy their path instead. For a PDF, image or Office document the Host reports workspace-file/not-text; the button then copies the file's absolute path and says so, rather than failing silently.
• Clear feedback. A check mark for two seconds after a successful copy, a warning mark and a reason on failure, both announced to assistive technology.
• Text files copy their text. Markdown, plain text and code files are copied as their source text; the copy does not include the preview's line numbers.

Preview	What lands on the clipboard
Plain text, Markdown, code, logs	The file's full text
CSV / TSV / JSON / YAML	The file's full text
PDF, image, Office (.docx, .xlsx, .pptx), zip, binary	The file's absolute path

Install

From the npm registry:

dsh plugin --profile web add dsh-copy-document-preview

Straight from GitHub:

dsh plugin --profile web add github:shellpower96/dsh-copy-document-preview

If your machine has no GitHub SSH key, use the HTTPS form of the same repository:

dsh plugin --profile web add https://github.com/shellpower96/dsh-copy-document-preview.git#main

Then restart dsh web. Alternatively install it from the Plugin Market or the Plugin Manager, which also enables the bundle for you.

Remove it with:

dsh plugin --profile web remove dsh-copy-document-preview

How it works

The plugin has no build step and no runtime dependencies. Its browser half registers one entry in the document toolbar's additive list slot (sidebar.right.tab.document.actions), a slot that only appends, so no existing control is replaced.

• The slot hands the entry the file's absolutePath; the Session id, the locale function and the standard hooks come from the slot runtime.
• Reading uses remote.workspaceFiles.read(sessionId, path, { offset }, signal), the same Remote the preview uses, so the file is read with the previewing Session's own authority and the host's byte and line limits still apply.
• The browser half never imports a Harness Client package, styles itself with the host's --dsw-alias-* theme tokens (so it follows light and dark mode), and routes every visible string through the client locale service (English and Simplified Chinese).
• Nothing is written outside the plugin's own component, and the button is the only DOM it owns.

Limitations

• The clipboard write uses navigator.clipboard, so the page must be a secure context (https:// or http://127.0.0.1) and focused. There is no execCommand('copy') fallback.
• A file larger than the host's per-page limits (maxLines, maxBytes) fails with the host's own too-large error, and so does a file with more than 200 pages.
• Binary files copy their path; the plugin cannot extract text from them.

License

MIT