perf(app): faster workspace creation

packages/app/src/utils/worktree.ts

@@ -0,0 +1,58 @@
+const normalize = (directory: string) => directory.replace(/[\\/]+$/, "")
+
+type State =
+  | {
+      status: "pending"
+    }
+  | {
+      status: "ready"
+    }
+  | {
+      status: "failed"
+      message: string
+    }
+
+const state = new Map<string, State>()
+const waiters = new Map<string, Array<(state: State) => void>>()
+
+export const Worktree = {
+  get(directory: string) {
+    return state.get(normalize(directory))
+  },
+  pending(directory: string) {
+    const key = normalize(directory)
+    const current = state.get(key)
+    if (current && current.status !== "pending") return
+    state.set(key, { status: "pending" })
+  },
+  ready(directory: string) {
+    const key = normalize(directory)
+    state.set(key, { status: "ready" })
+    const list = waiters.get(key)
+    if (!list) return
+    waiters.delete(key)
+    for (const fn of list) fn({ status: "ready" })
+  },
+  failed(directory: string, message: string) {
+    const key = normalize(directory)
+    state.set(key, { status: "failed", message })
+    const list = waiters.get(key)
+    if (!list) return
+    waiters.delete(key)
+    for (const fn of list) fn({ status: "failed", message })
+  },
+  wait(directory: string) {
+    const key = normalize(directory)
+    const current = state.get(key)
+    if (current && current.status !== "pending") return Promise.resolve(current)
+
+    return new Promise<State>((resolve) => {
+      const list = waiters.get(key)
+      if (!list) {
+        waiters.set(key, [resolve])
+        return
+      }
+      list.push(resolve)
+    })
+  },
+}