lanscer/dsh-workspace-drag

---

DSH Web UI plugin — in the sidebar grouped view, drag a conversation onto another workspace's title (or any session row within that group) and release to move the conversation there. Seamless drag-and-drop: no popups, no intermediate panels — drop it and it's organized.

Installation

Install from this GitHub repository with the official DSH plugin command:

dsh plugin --profile web add github:lanscer/dsh-workspace-drag

Or, for a local checkout, use the bundled one-command installer (run this from inside the plugin directory — the folder containing package.json; after cloning dsh-workspace-drag, cd into it first):

npm run install:plugin

Or directly (cross-platform, uses Node.js):

node install-plugin.mjs

Works on Windows (PowerShell), macOS and Linux — the installer is a plain Node.js script, no bash or PowerShell-specific syntax.

This registers the plugin into ~/.dsh/profiles/web (on Windows: %USERPROFILE%\.dsh\profiles\web) by adding a link: dependency to the profile's package.json and creating a node_modules symlink. It does not run pnpm install, so it avoids the pnpm minimumReleaseAge policy that rejects dependencies published within the last 24 hours. Idempotent — re-running is a no-op when already installed.

⚠️ Windows notes

• Run the command inside the cloned plugin folder, not in your home directory — npm run needs a package.json in the current directory (the error ENOENT ... C:\Users\<you>\package.json means you ran it in the wrong folder).
• Creating the symlink uses junction, which works on Windows without Developer Mode or Administrator rights.
• If symlink creation is blocked by policy, the link: dependency is still written to the profile — then finish with dsh plugin --profile web add link:<plugin-path>.

After installation:

• Client-only changes: refresh the browser page.
• Host changes: restart dsh web.

Note: the plugin requires the zstd CLI (see Dependencies).

Features

• Seamless cross-workspace drag-and-drop: drag a session row → hover over another workspace group (title or any session row within it) to highlight → release to migrate.
  • No floating panels, no confirmation dialogs; same-workspace drag-and-drop is left to DSH's native reordering, undisturbed.
  • A brief success banner appears after the move, and the conversation immediately appears in the target workspace.
• Toggle: enable/disable with one click on the Settings → Drag to Organize page; when disabled, drag-and-drop is inert (no highlighting, no migration).
• Safety:
  • Sessions whose agent is currently running cannot be moved (exact agent-status check, no more coarse 30-second mtime window).
  • For a conversation that just finished: the host automatically waits for the log to quiesce (up to 15 s) and then migrates — one drop completes the move, no "retry later" loop.
  • The host-side migration is a copy-verify-atomic-swap: the session directory is copied to a staging location, the rewritten log is verified, then published to the destination. The old directory is only removed after the new copy is verified — data is never lost on failure.
  • The migration physically relocates the session log file, rewrites the header cwd field, and updates the workspace registry ownership account plus in-memory state (live header / persistence write handle / registry index), so the conversation remains usable after the move.
  • Live-write-handle re-pointing (the ENOENT fix): DSH's jsonl backend derives every append path from the open write handle's header.cwd (JsonlSessionHandle.persistContiguous → appendLines → logPath(root, meta.cwd, id)) and routes live events through that same handle by id (tracker.writers). A move that rewrote only the file and the session object left the handle stamped with the old directory, so the next turn failed with ENOENT: no such file or directory, open '<old path>/session.v3.jsonl.zstd'. The move now re-stamps the handle's header before the old directory is deleted, and fails closed — original untouched, published copy removed — when the handle cannot be re-pointed.

Data Model

• Each session's workspace identity is its header cwd (an absolute directory path).
• Sessions are stored at ~/.dsh/sessions/<projectKey(cwd)>/<session-id>/session.v<format-version>.jsonl[.zstd]. The format version advances with DSH: v3 (session.v3.jsonl[.zstd]) since 0.1.5, v4 (session.v4.jsonl[.zstd]) since 0.1.7-rc.1. The original release's session.jsonl[.zstd] (no vN component, i.e. version 0) is still kept on disk.
• Migration = relocating the session directory under the new workspace's projectKey directory + rewriting the first (header) line's cwd + using ctx.workspaceRegistry's detach/attach to update the workspace ownership ledger.
• The format version is discovered, never hardcoded: the plugin scans the session directory for the canonical name pattern ^session(?:\.v([1-9][0-9]*))?\.jsonl(\.zstd)?$, takes the highest generation, and rewrites the header cwd in every generation present (current + older + legacy session.jsonl[.zstd]). A future v5/v6 therefore needs no plugin change, while backups (*.bak-*, *.pre-fix-*, *.corrupt-*) fail the pattern and are ignored. The DSH persistence layer derives the expected path from (cwd, id) and rejects a mismatch with corrupt session log: header id ... and cwd identify ..., so every generation must be rewritten.
• sessionPersistence.list() return contract: since DSH 0.1.7-rc.1 it returns SessionPersistenceSnapshot records ({ header, revision, sizeBytes? }) with the header nested under .header; older builds returned the header itself. The plugin accepts both shapes. list() is treated as best-effort: it walks the whole session tree, so one unusable artifact (a future format, a duplicate id left by an interrupted move, an encoding mismatch) makes it throw — the plugin then falls back to its own filesystem scan, which affects only that session instead of disabling the feature globally.
• zstd logs are concatenated multi-frame containers: frame 1 = exactly one header line (newline-terminated), frames 2..N = appended event batches. The DSH reader requires the first frame to decode to exactly this header line.
• During migration, zstd logs undergo frame-preserving surgery: only frame 1 is decoded → the header cwd is rewritten → re-encoded as a single checksummed frame (matching the DSH backend) → concatenated with the remaining original frames (byte-identical). The log must never be compressed as a single frame (that would break the DSH reader's "first frame = header only" invariant).

File Layout

dsh-workspace-drag/
├── package.json          # dsh.bundle.patch + client inject
├── cordis.patch.yml      # registers the plugin row in the web profile
├── lib/
│   ├── index.js          # Host: config/move HTTP routes + migration logic
│   └── client.js         # Browser: settings page (toggle) + document-level drag engine
├── test/
│   ├── fixtures/multiframe-session.jsonl.zstd  # multi-frame zstd session sample (7 frames)
│   ├── verify-core.mjs              # zstd round-trip + DSH frame scanner compatibility
│   └── integration-move.mjs         # end-to-end integration test for moveSessionToWorkspace
└── README.md

Host HTTP API

Method	Path	Description
GET	/api/dsh-workspace-drag/config	Read toggle { "enabled": true }
POST	/api/dsh-workspace-drag/config	Write toggle { "enabled": false }
POST	/api/dsh-workspace-drag/move	{ "sessionId", "targetWorkspaceId", "waitMs" } — move a conversation; optional waitMs (0–30000) makes the host wait for the agent/log to quiesce and finish automatically; failures carry a code (agent-running / writing / move-failed)

Configuration is persisted in ~/.dsh/dsh-workspace-drag.json.

Dependencies

• The host half requires the zstd CLI. The plugin auto-detects the binary via PATH search, falling back to common paths (/opt/homebrew/bin/zstd, /usr/local/bin/zstd, /usr/bin/zstd). Install via brew install zstd (macOS) or apt install zstd (Linux).
• Requires DSH built-in services: webServer / sessions / sessionPersistence / workspaceRegistry (all loaded by @deepseek-ai/dsh-web-app).
• DSH version compatibility: peerDependencies declare >=0.0.1-rc.1 <0.2.0-0, i.e. the whole 0.1.x line including prereleases (such as 0.1.7-rc.1), excluding untested 0.2.x. The session-log format version and the list() return shape are both probed at runtime, so a DSH upgrade within 0.1.x needs no plugin change.

Tests

cd test
node verify-core.mjs      # Validate zstd round-trip + DSH frame scanner compatibility
node integration-move.mjs # End-to-end integration test (temp dir, no real data touched); covers the v3/v4 + SessionPersistenceSnapshot regressions

Limitations

• Conversations whose agent is currently running cannot be moved (you are asked to wait for the reply to finish); for a just-finished conversation the host waits for the log to quiesce and migrates automatically.
• Migration changes the session's cwd — its workspace ownership and disk storage location. This is the essence of "organizing into a workspace."
• The zstd CLI must be installed (auto-detected via PATH; no hardcoded path).

License

MIT

---