Rename .js to .mjs and update import paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

debug-window.mjs

@@ -0,0 +1,59 @@
+#!/usr/bin/env node
+import { readdirSync, readFileSync, readlinkSync } from 'fs';
+import { execFileSync } from 'child_process';
+
+const window_id = process.argv[2];
+if (!window_id) {
+	console.error('Usage: debug-window.js <window-id>');
+	process.exit(1);
+}
+
+function read_file(path) {
+	try { return readFileSync(path, 'utf8'); } catch { return null; }
+}
+
+function get_ppid(pid) {
+	const status = read_file(`/proc/${pid}/status`);
+	const match = status?.match(/^PPid:\s+(\d+)/m);
+	return match ? match[1] : null;
+}
+
+function get_comm(pid) {
+	return read_file(`/proc/${pid}/comm`)?.trim() ?? null;
+}
+
+function get_cmdline(pid) {
+	return read_file(`/proc/${pid}/cmdline`)?.replace(/\0/g, ' ').trim() ?? null;
+}
+
+// Get PID of the window
+const out = execFileSync('xprop', ['-id', window_id, '_NET_WM_PID'], { encoding: 'utf8' });
+const match = out.match(/= (\d+)/);
+if (!match) {
+	console.error('Could not get PID for window', window_id);
+	process.exit(1);
+}
+const root_pid = match[1];
+console.log(`Window ${window_id} → PID ${root_pid} (${get_comm(root_pid)})`);
+
+// Find all descendants
+const children = new Map(); // pid → [child pids]
+for (const entry of readdirSync('/proc')) {
+	if (!/^\d+$/.test(entry)) continue;
+	const ppid = get_ppid(entry);
+	if (!ppid) continue;
+	if (!children.has(ppid)) children.set(ppid, []);
+	children.get(ppid).push(entry);
+}
+
+function print_tree(pid, depth = 0) {
+	const indent = '  '.repeat(depth);
+	const comm = get_comm(pid) ?? '?';
+	const cmdline = get_cmdline(pid) ?? '';
+	console.log(`${indent}${pid} [${comm}] ${cmdline.slice(0, 120)}`);
+	for (const child of children.get(pid) ?? []) {
+		print_tree(child, depth + 1);
+	}
+}
+
+print_tree(root_pid);