add forms

forms/bin/forms.js

@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+import { spawn } from "child_process"
+import fs from "fs"
+import path from "path"
+import { fileURLToPath } from "url"
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const KERNEL = path.join(__dirname, "../kernel/kernel.js")
+const PID_FILE = "/tmp/forms.pid"
+
+const cmd = process.argv[2]
+
+if (cmd === "start") {
+    if (fs.existsSync(PID_FILE)) {
+        console.log("forms kernel already running")
+        process.exit(0)
+    }
+
+    const proc = spawn("node", [KERNEL], {
+        detached: true,
+        stdio: "ignore"
+    })
+
+    proc.unref()
+    fs.writeFileSync(PID_FILE, String(proc.pid))
+    console.log("forms kernel started")
+}
+
+if (cmd === "stop") {
+    if (!fs.existsSync(PID_FILE)) {
+        console.log("forms kernel not running")
+        process.exit(0)
+    }
+
+    const pid = Number(fs.readFileSync(PID_FILE))
+    process.kill(pid)
+    fs.unlinkSync(PID_FILE)
+    console.log("forms kernel stopped")
+}
+
+if (!cmd) {
+    console.log("usage: forms start | stop")
+}