feat: add persistent desktop assistant workspace

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

src/main/assistant/workspace-changes-service.ts

@@ -0,0 +1,113 @@
+import spawn from 'cross-spawn'
+import type { WorkspaceChanges } from '../../shared/assistant-contracts'
+
+const MAX_OUTPUT_BYTES = 512 * 1024
+const COMMAND_TIMEOUT_MS = 10_000
+
+type CommandResult = {
+  code: number | null
+  stdout: string
+  stderr: string
+  truncated: boolean
+}
+
+function runGit(
+  rootPath: string,
+  args: string[]
+): Promise<CommandResult> {
+  return new Promise((resolve, reject) => {
+    const child = spawn('git', args, {
+      cwd: rootPath,
+      shell: false,
+      windowsHide: true,
+      stdio: ['ignore', 'pipe', 'pipe']
+    })
+    const stdout: Buffer[] = []
+    const stderr: Buffer[] = []
+    let bytes = 0
+    let truncated = false
+    const capture = (target: Buffer[], chunk: Buffer | string): void => {
+      const buffer = Buffer.from(chunk)
+      const remaining = MAX_OUTPUT_BYTES - bytes
+      if (remaining <= 0) {
+        truncated = true
+        return
+      }
+      target.push(buffer.subarray(0, remaining))
+      bytes += Math.min(buffer.byteLength, remaining)
+      truncated ||= buffer.byteLength > remaining
+    }
+    child.stdout?.on('data', (chunk: Buffer | string) =>
+      capture(stdout, chunk)
+    )
+    child.stderr?.on('data', (chunk: Buffer | string) =>
+      capture(stderr, chunk)
+    )
+    const timeout = setTimeout(() => {
+      child.kill()
+      reject(new Error('读取文件更改超时'))
+    }, COMMAND_TIMEOUT_MS)
+    child.once('error', (error) => {
+      clearTimeout(timeout)
+      reject(error)
+    })
+    child.once('close', (code) => {
+      clearTimeout(timeout)
+      resolve({
+        code,
+        stdout: Buffer.concat(stdout).toString('utf8'),
+        stderr: Buffer.concat(stderr).toString('utf8'),
+        truncated
+      })
+    })
+  })
+}
+
+export async function getWorkspaceChanges(
+  rootPath: string
+): Promise<WorkspaceChanges> {
+  if (!rootPath.trim()) {
+    return {
+      rootPath,
+      available: false,
+      status: '',
+      patch: '',
+      truncated: false,
+      error: '项目尚未配置工作区目录'
+    }
+  }
+  try {
+    const [status, patch] = await Promise.all([
+      runGit(rootPath, ['status', '--short', '--untracked-files=normal']),
+      runGit(rootPath, ['diff', '--no-ext-diff', '--no-color', 'HEAD'])
+    ])
+    if (status.code !== 0 || patch.code !== 0) {
+      const detail = status.stderr || patch.stderr
+      return {
+        rootPath,
+        available: false,
+        status: '',
+        patch: '',
+        truncated: status.truncated || patch.truncated,
+        error: detail.trim().slice(0, 2_000) || '无法读取 Git 工作区'
+      }
+    }
+    return {
+      rootPath,
+      available: true,
+      status: status.stdout,
+      patch: patch.stdout,
+      truncated: status.truncated || patch.truncated
+    }
+  } catch (error) {
+    return {
+      rootPath,
+      available: false,
+      status: '',
+      patch: '',
+      truncated: false,
+      error:
+        error instanceof Error ? error.message : '无法读取 Git 工作区'
+    }
+  }
+}