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120
.opencode/skills/nrepl-eval/SKILL.md Normal file
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@ -0,0 +1,120 @@
---
name: nrepl-eval
description: Evaluate Clojure code via nREPL using the standalone tools/nrepl-eval.mjs CLI tool.
---
# nREPL Eval
Evaluate Clojure (or ClojureScript) code via a running nREPL server using
`tools/nrepl-eval.mjs` — a standalone CLI application.
Session state (defs, in-ns, etc.) persists across invocations via a stored
session ID, so you can build up state incrementally.
## Usage
```bash
node tools/nrepl-eval.mjs [options] [<code>]
```
The tool is also executable directly:
```bash
./tools/nrepl-eval.mjs [options] [<code>]
```
## Options
| Flag | Description | Default |
|------|-------------|---------|
| `-p, --port PORT` | nREPL server port | `6064` |
| `-H, --host HOST` | nREPL server host | `127.0.0.1` |
| `-t, --timeout MS` | Timeout in milliseconds | `120000` |
| `--reset-session` | Discard stored session and start fresh | — |
| `-e, --last-error` | Evaluate `*e` to retrieve the last exception | — |
| `-h, --help` | Show help message | — |
## When to Use
Use this tool when you need to:
1. **Evaluate Clojure code** during development — test functions, inspect
state, or run experiments against a running Clojure process.
2. **Verify that edited files compile** — require namespaces with `:reload`
to pick up changes.
3. **Inspect the last exception** after a failed evaluation — use `-e` to
print the error stored in `*e`.
## Workflow
### 1. Session management
Sessions are persisted to `/tmp/penpot-nrepl-session-<host>-<port>`. State
carries across calls automatically:
```bash
./tools/nrepl-eval.mjs '(def x 42)'
./tools/nrepl-eval.mjs 'x'
# => 42
```
Reset the session to start fresh:
```bash
./tools/nrepl-eval.mjs --reset-session '(def x 0)'
```
### 2. Evaluate code
**Single expression (inline) — uses default port 6064:**
```bash
./tools/nrepl-eval.mjs '(+ 1 2 3)'
```
**Multiple expressions via heredoc (recommended — avoids escaping issues):**
```bash
./tools/nrepl-eval.mjs <<'EOF'
(def x 10)
(+ x 20)
EOF
```
**Override with a different port:**
```bash
./tools/nrepl-eval.mjs -p 7888 '(+ 1 2 3)'
```
### 3. Inspect last exception
After code throws an error, retrieve the full exception details:
```bash
./tools/nrepl-eval.mjs -e
```
## Common Patterns
**Require a namespace with reload:**
```bash
./tools/nrepl-eval.mjs "(require '[my.namespace :as ns] :reload)"
```
**Test a function:**
```bash
./tools/nrepl-eval.mjs "(ns/my-function arg1 arg2)"
```
**Long-running operation with custom timeout:**
```bash
./tools/nrepl-eval.mjs -t 300000 "(long-running-fn)"
```
## Key Principles
- **Default port is 6064** — just pass code directly, no `-p` needed when
your nREPL server is on 6064. Use `-p <PORT>` for a different port.
- **Always use `:reload`** when requiring namespaces to pick up file changes.
- **Session is reused** across invocations — defs, in-ns, and var bindings
persist. Use `--reset-session` to clear.
- **Do not start any server** — the tool connects to an existing nREPL
server, it is not the agent's responsibility to start the nREPL server
(assume the server is already running on the specified port).

5
backend/src/app/main.clj
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@ -659,9 +659,8 @@
[& _args]
(try
(let [p (promise)]
(when (contains? cf/flags :nrepl-server)
(l/inf :hint "start nrepl server" :port 6064)
(nrepl/start-server :bind "0.0.0.0" :port 6064))
(l/inf :hint "start nrepl server" :port 6064)
(nrepl/start-server :bind "0.0.0.0" :port 6064)
(start)
(deref p))

7
package.json
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@ -16,9 +16,10 @@
"fmt": "./scripts/fmt"
},
"devDependencies": {
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"@types/node": "^25.6.0",
"@github/copilot": "^1.0.44",
"@types/node": "^25.6.2",
"esbuild": "^0.28.0",
"opencode-ai": "^1.14.40"
"nrepl-client": "^0.3.0",
"opencode-ai": "^1.14.46"
}
}

196
pnpm-lock.yaml generated
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opencode-linux-x64-musl@1.14.40:
opencode-linux-x64-musl@1.14.46:
optional: true
opencode-linux-x64@1.14.40:
opencode-linux-x64@1.14.46:
optional: true
opencode-windows-arm64@1.14.40:
opencode-windows-arm64@1.14.46:
optional: true
opencode-windows-x64-baseline@1.14.40:
opencode-windows-x64-baseline@1.14.46:
optional: true
opencode-windows-x64@1.14.40:
opencode-windows-x64@1.14.46:
optional: true
tree-kill@1.2.2: {}
undici-types@7.19.2: {}

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tools/nrepl-eval.mjs Executable file
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#!/usr/bin/env node
import nreplClient from "nrepl-client";
import { readFileSync, writeFileSync, existsSync, unlinkSync } from "fs";
import path from "path";
import os from "os";
const DEFAULT_TIMEOUT = 120000;
// ============================================================================
// Session persistence
// ============================================================================
function sessionFilePath(host, port) {
return path.join(os.tmpdir(), `penpot-nrepl-session-${host}-${port}`);
}
function readSession(host, port) {
const fp = sessionFilePath(host, port);
try {
return readFileSync(fp, "utf8").trim() || null;
} catch {
return null;
}
}
function writeSession(host, port, id) {
writeFileSync(sessionFilePath(host, port), id, "utf8");
}
function deleteSession(host, port) {
const fp = sessionFilePath(host, port);
if (existsSync(fp)) unlinkSync(fp);
}
// ============================================================================
// nREPL helpers (promisified)
// ============================================================================
function nreplSend(con, msg) {
return new Promise((resolve, reject) => {
con.send(msg, (err, messages) => {
if (err) {
const text = Array.isArray(err)
? err.map((e) => (e && e.message) || String(e)).join("; ")
: String(err);
reject(new Error(text));
} else {
resolve(messages || []);
}
});
});
}
function nreplEval({ host, port, code, sessionId, timeout = DEFAULT_TIMEOUT }) {
return new Promise((resolve, reject) => {
const con = nreplClient.connect({ host, port });
let finished = false;
const finish = (err, result) => {
if (finished) return;
finished = true;
clearTimeout(timer);
try { con.end(); } catch (_) {}
if (err) reject(err);
else resolve(result);
};
const timer = setTimeout(() => {
finish(new Error(`nREPL eval timed out after ${timeout}ms`));
}, timeout);
con.on("error", (err) => {
finish(err);
});
con.once("connect", async () => {
try {
let sid = sessionId;
if (!sid) {
const msgs = await nreplSend(con, { op: "clone" });
const m = msgs.find((m) => m["new-session"]);
if (!m) throw new Error("Clone response missing new-session");
sid = m["new-session"];
}
const messages = await nreplSend(con, { op: "eval", code, session: sid });
finish(null, { messages, sessionId: sid });
} catch (err) {
finish(err);
}
});
});
}
// ============================================================================
// Output formatting
// ============================================================================
function formatEvalMessages(messages) {
const lines = [];
let hasContent = false;
for (const msg of messages) {
if (msg.out) {
lines.push(msg.out);
hasContent = true;
}
if (msg.err) {
lines.push(`[ERROR] ${msg.err}`);
hasContent = true;
}
if (msg.value) {
const ns = msg.ns ? ` (ns: ${msg.ns})` : "";
lines.push(`=> ${msg.value}${ns}`);
hasContent = true;
}
}
if (!hasContent) {
const statuses = messages.map((m) => m.status).filter(Boolean).flat();
return `Evaluation completed. Status: ${statuses.join(", ") || "done"}`;
}
return lines.join("\n");
}
// ============================================================================
// CLI argument parsing
// ============================================================================
function parseArgs(argv) {
const args = {
port: 6064,
host: "127.0.0.1",
timeout: DEFAULT_TIMEOUT,
help: false,
resetSession: false,
lastError: false,
code: null,
};
for (let i = 0; i < argv.length; i++) {
const a = argv[i];
if (a === "-p" || a === "--port") {
const val = argv[++i];
if (val === undefined) { console.error("Error: --port requires a value."); process.exit(1); }
args.port = parseInt(val, 10);
} else if (a === "-H" || a === "--host") {
const val = argv[++i];
if (val === undefined) { console.error("Error: --host requires a value."); process.exit(1); }
args.host = val;
} else if (a === "-t" || a === "--timeout") {
const val = argv[++i];
if (val === undefined) { console.error("Error: --timeout requires a value."); process.exit(1); }
args.timeout = parseInt(val, 10);
} else if (a === "--reset-session") {
args.resetSession = true;
} else if (a === "-e" || a === "--last-error") {
args.lastError = true;
} else if (a === "-h" || a === "--help") {
args.help = true;
} else {
if (args.code === null) {
args.code = a;
} else {
args.code += " " + a;
}
}
}
return args;
}
function printHelp() {
const bin = path.basename(process.argv[1]);
console.log(`Usage: ${bin} [options] [<code>]
Evaluate Clojure code via a running nREPL server. Session state (defs, in-ns)
persists across invocations via a stored session ID.
Options:
-p, --port PORT nREPL port (default: 6064)
-H, --host HOST nREPL host (default: 127.0.0.1)
-t, --timeout MILLISECONDS Timeout in milliseconds (default: 120000)
--reset-session Discard stored session and start fresh
-e, --last-error Evaluate *e to retrieve the last exception
-h, --help Show this help message
Examples:
${bin} '(def x 42)'
${bin} 'x'
${bin} --reset-session '(def x 0)'
${bin} --last-error
${bin} <<'EOF'
(def x 10)
(+ x 20)
EOF`);
}
function readStdin() {
return new Promise((resolve) => {
if (process.stdin.isTTY) {
resolve("");
return;
}
let data = "";
process.stdin.setEncoding("utf-8");
process.stdin.on("data", (chunk) => { data += chunk; });
process.stdin.on("end", () => { resolve(data.trim()); });
});
}
// ============================================================================
// Main
// ============================================================================
async function main() {
const args = parseArgs(process.argv.slice(2));
if (args.help) {
printHelp();
return;
}
if (isNaN(args.port) || args.port < 1 || args.port > 65535) {
console.error("Error: invalid port number.");
process.exit(1);
}
if (args.resetSession) {
deleteSession(args.host, args.port);
}
let code = args.lastError ? "*e" : args.code;
if (!code) {
code = await readStdin();
}
if (!code) {
console.error("Error: No code provided. Pass code as an argument or pipe it via stdin.");
process.exit(1);
}
const storedSession = readSession(args.host, args.port);
const { messages, sessionId } = await nreplEval({
host: args.host,
port: args.port,
code,
sessionId: storedSession,
timeout: args.timeout,
});
writeSession(args.host, args.port, sessionId);
console.log(formatEvalMessages(messages));
}
main().catch((err) => {
console.error(`Error: ${err.message || err}`);
process.exit(1);
});