Logseq Repl

Logseq REPL Workflow

Use this skill when the user needs a Logseq development REPL for:

• Desktop renderer :app
• Electron main process :electron
• :db-worker-node
• any combination of those runtimes

The workflow uses one shared state directory: <repo>/tmp/logseq-repl/.

Scripts

Start everything with the default Logseq data root ($LOGSEQ_CLI_ROOT_DIR or ~/logseq):

<logseq-repl-skill-dir>/scripts/start-repl.sh --repo demo

Start everything with an explicit Logseq data root:

<logseq-repl-skill-dir>/scripts/start-repl.sh --repo demo --root-dir ~/logseq

Clean up everything:

<logseq-repl-skill-dir>/scripts/cleanup-repl.sh

Verify all REPL targets after startup:

<logseq-repl-skill-dir>/scripts/verify-repls.sh

start-repl.sh starts:

1. shared pnpm watch
2. Desktop dev app via pnpm dev-electron-app
3. db-worker-node via node ./static/db-worker-node.js --repo <name> --root-dir <path> --owner-source cli

start-repl.sh is a small shell wrapper around start-repl.py. The Python script verifies that :app, :electron, and :db-worker-node runtimes are live, runs verify-repls.sh to connect to each target REPL and print a small result, then prints attach commands. It does not attach an interactive REPL by itself and exits after verification.

cleanup-repl.sh stops all workflow-managed processes without requiring a target selection. It also removes legacy state files from older split workflows and attempts to stop repo-owned listeners on the standard REPL ports.

verify-repls.sh connects to app, electron, and db-worker-node with pnpm exec shadow-cljs cljs-repl, evaluates one target-specific expression in each REPL, and prints the output.

Standard Flow

Before starting or attaching:

<logseq-repl-skill-dir>/scripts/cleanup-repl.sh

Then start all runtimes:

<logseq-repl-skill-dir>/scripts/start-repl.sh --repo demo

Use --root-dir <path> if the target graph lives outside $LOGSEQ_CLI_ROOT_DIR or ~/logseq.

Attach only to the target you need:

pnpm exec shadow-cljs cljs-repl app
pnpm exec shadow-cljs cljs-repl electron
pnpm exec shadow-cljs cljs-repl db-worker-node

Runtime Selection

• Need DOM, UI, renderer state, or page rendering? Use :app.
• Need Electron main process APIs, menus, window lifecycle, or main-process filesystem behavior? Use :electron.
• Need Node worker behavior or db-worker-node code paths? Use :db-worker-node.

Runtime reminders:

• :app = Electron renderer
• :electron = Electron main process
• :db-worker = browser worker
• :db-worker-node = Node worker

Readiness Model

Keep these separate:

1. watch alive: a shadow-cljs server or pnpm watch process exists
2. build ready: the target build completed successfully
3. runtime attached: a live JS runtime is connected for :app, :electron, or :db-worker-node

If runtime count is 0, do not attach yet. Fix runtime startup first.

Check runtime counts:

pnpm exec shadow-cljs clj-eval "(do (require '[shadow.cljs.devtools.api :as api]) (println {:app (count (api/repl-runtimes :app)) :electron (count (api/repl-runtimes :electron)) :db-worker-node (count (api/repl-runtimes :db-worker-node))}))"

Interpretation:

• :app > 0 means a Desktop renderer runtime is attached
• :electron > 0 means an Electron main-process runtime is attached
• :db-worker-node > 0 means a worker-node runtime is attached
• 0 means not ready, even if watch/build logs look healthy

Logs

Look here first:

• <repo>/tmp/logseq-repl/shared-shadow-watch.log
• <repo>/tmp/logseq-repl/desktop-electron.log
• <repo>/tmp/logseq-repl/db-worker-node.log

Port Audit

After cleanup, verify standard ports if startup still reports conflicts:

lsof -nP -iTCP:8701 -sTCP:LISTEN
lsof -nP -iTCP:3001 -sTCP:LISTEN
lsof -nP -iTCP:3002 -sTCP:LISTEN
lsof -nP -iTCP:9630 -sTCP:LISTEN
lsof -nP -iTCP:9631 -sTCP:LISTEN

Interpretation:

• no listeners: clean enough to continue
• listeners after cleanup: resolve the external conflict first
• listeners only after startup: expected if owned by the workflow

Non-Interactive Verification Examples

Desktop :app:

cat <<'EOF' | pnpm exec shadow-cljs cljs-repl app
(prn {:runtime :app :document? (some? js/document) :title (.-title js/document)})
:cljs/quit
EOF

Electron :electron:

cat <<'EOF' | pnpm exec shadow-cljs cljs-repl electron
(prn {:runtime :electron :process? (some? js/process) :type (.-type js/process)})
:cljs/quit
EOF

db-worker-node:

cat <<'EOF' | pnpm exec shadow-cljs cljs-repl db-worker-node
(prn {:runtime :db-worker-node :process? (some? js/process) :platform (.-platform js/process)})
:cljs/quit
EOF

Editor Attach Helpers

(shadow.user/cljs-repl)
(shadow.user/electron-repl)
(shadow.user/worker-node-repl)

Troubleshooting

Failure triage order:

1. inspect tmp/logseq-repl/shared-shadow-watch.log
2. inspect tmp/logseq-repl/desktop-electron.log
3. inspect tmp/logseq-repl/db-worker-node.log
4. inspect standard port listeners with lsof
5. inspect runtime counts with shadow.cljs.devtools.api/repl-runtimes

Common cases:

• No available JS runtime: the build may be ready, but the runtime has not connected. Check runtime counts before retrying attach.
• multiple :app runtimes: close browser dev app instances so only the Desktop renderer remains.
• ports already in use after cleanup: another Logseq/shadow-cljs dev session is still running.
• db-worker-node repo mismatch: rerun start-repl.sh --repo <name>; it restarts the worker runtime for the requested repo.

Recommended Response Pattern

When helping a user connect to a REPL:

1. identify whether they need :app, :electron, :db-worker-node, or a combination
2. run cleanup-repl.sh
3. if standard ports remain occupied, resolve that conflict first
4. run start-repl.sh --repo <name>
5. verify runtime counts if attach fails
6. attach to the matching build or helper
7. run cleanup-repl.sh when finished