adds correct git watcher

src/main/index.ts

@@ -1,4 +1,5 @@
-import { join, sep } from 'node:path'
+import { join, resolve, sep } from 'node:path'
+import { readFileSync, statSync } from 'node:fs'
 import { app, dialog, shell, BrowserWindow, ipcMain, Menu } from 'electron'
 import { watch, type FSWatcher } from 'chokidar'
 import { addRecentProject, getName, getRecentProjects, getRoot, openDialog, setRoot } from './project'
@@ -18,7 +19,9 @@ const WATCH_IGNORE = new Set([
 
 let watcher: FSWatcher | null = null
 let configWatcher: FSWatcher | null = null
+let gitWatcher: FSWatcher | null = null
 let watchTimer: ReturnType<typeof setTimeout> | null = null
+let gitTimer: ReturnType<typeof setTimeout> | null = null
 
 function broadcast(channel: string): void {
   for (const w of BrowserWindow.getAllWindows()) w.webContents.send(channel)
@@ -34,6 +37,47 @@ function startConfigWatcher(): void {
   configWatcher.on('add', reload).on('change', reload).on('unlink', reload)
 }
 
+/** Resolve the real git directory for a project root. Normally this is
+ * `<root>/.git`, but for worktrees/submodules `.git` is a file containing
+ * `gitdir: <path>` pointing at the actual directory. */
+function gitDir(root: string): string {
+  const dot = join(root, '.git')
+  try {
+    if (statSync(dot).isFile()) {
+      const m = readFileSync(dot, 'utf8').trim().match(/^gitdir:\s*(.+)$/)
+      if (m) return resolve(root, m[1].trim())
+    }
+  } catch { /* not a worktree, or .git missing */ }
+  return dot
+}
+
+/** The main watcher ignores `.git`, so branch switches / commits / staging
+ * done by external tools (Sublime Merge, the CLI, …) would never refresh the
+ * git column. Watch the few git files that mark those events so the renderer
+ * re-reads status: HEAD (branch switch), index (staging), refs/heads + logs
+ * (commits), MERGE_HEAD (in-progress merge). */
+function startGitWatcher(): void {
+  if (gitWatcher) { gitWatcher.close(); gitWatcher = null }
+  const root = getRoot()
+  if (!root) return
+  const dir = gitDir(root)
+  gitWatcher = watch(
+    [
+      join(dir, 'HEAD'),
+      join(dir, 'index'),
+      join(dir, 'refs', 'heads'),
+      join(dir, 'logs', 'HEAD'),
+      join(dir, 'MERGE_HEAD'),
+    ],
+    { ignoreInitial: true },
+  )
+  const ping = (): void => {
+    if (gitTimer) clearTimeout(gitTimer)
+    gitTimer = setTimeout(() => broadcast('project:changed'), 200)
+  }
+  gitWatcher.on('add', ping).on('change', ping).on('unlink', ping).on('addDir', ping).on('unlinkDir', ping)
+}
+
 /** Show the folder picker; if a new folder is chosen, switch the project
  * (config + watchers). Returns whether the project changed. */
 async function openFolderFlow(win: BrowserWindow | null): Promise<boolean> {
@@ -42,6 +86,7 @@ async function openFolderFlow(win: BrowserWindow | null): Promise<boolean> {
   await resolveConfig(next)
   startWatcher()
   startConfigWatcher()
+  startGitWatcher()
   return true
 }
 
@@ -95,7 +140,7 @@ function registerIpc(): void {
   ipcMain.handle('project:openPath', async (_e, path: string) => {
     setRoot(path)
     const r = getRoot()
-    if (r) { await resolveConfig(r); startWatcher(); startConfigWatcher() }
+    if (r) { await resolveConfig(r); startWatcher(); startConfigWatcher(); startGitWatcher() }
     broadcast('project:changed')
     return { root: getRoot(), name: getName() }
   })
@@ -185,6 +230,7 @@ app.whenReady().then(async () => {
     await addRecentProject(initialRoot)
     startWatcher()
     startConfigWatcher()
+    startGitWatcher()
   }
   createWindow()
 
@@ -196,6 +242,7 @@ app.whenReady().then(async () => {
 app.on('window-all-closed', () => {
   if (watcher) { watcher.close(); watcher = null }
   if (configWatcher) { configWatcher.close(); configWatcher = null }
+  if (gitWatcher) { gitWatcher.close(); gitWatcher = null }
   killAllPtys()
   if (!isMac) app.quit()
 })