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{ type ExecFileException, execFile, spawnSync } from \"child_process\";\nimport { existsSync, type FSWatcher, readFileSync, statSync, unwatchFile, watchFile } from \"fs\";\nimport { dirname, join, resolve } from \"path\";\nimport { closeWatcher, FS_WATCH_RETRY_DELAY_MS, watchWithErrorHandler } from \"../utils/fs-watch.js\";\n\ntype GitPaths = {\n\trepoDir: string;\n\tcommonGitDir: string;\n\theadPath: string;\n};\n\n/**\n * Find git metadata paths by walking up from cwd.\n * Handles both regular git repos (.git is a directory) and worktrees (.git is a file).\n */\nfunction findGitPaths(cwd: string): GitPaths | null {\n\tlet dir = cwd;\n\twhile (true) {\n\t\tconst gitPath = join(dir, \".git\");\n\t\tif (existsSync(gitPath)) {\n\t\t\ttry {\n\t\t\t\tconst stat = statSync(gitPath);\n\t\t\t\tif (stat.isFile()) {\n\t\t\t\t\tconst content = readFileSync(gitPath, \"utf8\").trim();\n\t\t\t\t\tif (content.startsWith(\"gitdir: \")) {\n\t\t\t\t\t\tconst gitDir = resolve(dir, content.slice(8).trim());\n\t\t\t\t\t\tconst headPath = join(gitDir, \"HEAD\");\n\t\t\t\t\t\tif (!existsSync(headPath)) return null;\n\t\t\t\t\t\tconst commonDirPath = join(gitDir, \"commondir\");\n\t\t\t\t\t\tconst commonGitDir = existsSync(commonDirPath)\n\t\t\t\t\t\t\t? resolve(gitDir, readFileSync(commonDirPath, \"utf8\").trim())\n\t\t\t\t\t\t\t: gitDir;\n\t\t\t\t\t\treturn { repoDir: dir, commonGitDir, headPath };\n\t\t\t\t\t}\n\t\t\t\t} else if (stat.isDirectory()) {\n\t\t\t\t\tconst headPath = join(gitPath, \"HEAD\");\n\t\t\t\t\tif (!existsSync(headPath)) return null;\n\t\t\t\t\treturn { repoDir: dir, commonGitDir: gitPath, headPath };\n\t\t\t\t}\n\t\t\t} catch {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t}\n\t\tconst parent = dirname(dir);\n\t\tif (parent === dir) return null;\n\t\tdir = parent;\n\t}\n}\n\n/** Ask git for the current branch. Returns null on detached HEAD or if git is unavailable. */\nfunction resolveBranchWithGitSync(repoDir: string): string | null {\n\tconst result = spawnSync(\"git\", [\"--no-optional-locks\", \"symbolic-ref\", \"--quiet\", \"--short\", \"HEAD\"], {\n\t\tcwd: repoDir,\n\t\tencoding: \"utf8\",\n\t\tstdio: [\"ignore\", \"pipe\", \"ignore\"],\n\t});\n\tconst branch = result.status === 0 ? result.stdout.trim() : \"\";\n\treturn branch || null;\n}\n\n/** Ask git for the current branch asynchronously. Returns null on detached HEAD or if git is unavailable. */\nfunction resolveBranchWithGitAsync(repoDir: string): Promise<string | null> {\n\treturn new Promise((resolvePromise) => {\n\t\texecFile(\n\t\t\t\"git\",\n\t\t\t[\"--no-optional-locks\", \"symbolic-ref\", \"--quiet\", \"--short\", \"HEAD\"],\n\t\t\t{\n\t\t\t\tcwd: repoDir,\n\t\t\t\tencoding: \"utf8\",\n\t\t\t},\n\t\t\t(error: ExecFileException | null, stdout: string) => {\n\t\t\t\tif (error) {\n\t\t\t\t\tresolvePromise(null);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tconst branch = stdout.trim();\n\t\t\t\tresolvePromise(branch || null);\n\t\t\t},\n\t\t);\n\t});\n}\n\n/**\n * Provides git branch and extension statuses - data not otherwise accessible to extensions.\n * Token stats, model info available via ctx.sessionManager and ctx.model.\n */\nexport class FooterDataProvider {\n\tprivate cwd: string;\n\tprivate static readonly WATCH_DEBOUNCE_MS = 500;\n\n\tprivate extensionStatuses = new Map<string, string>();\n\tprivate cachedBranch: string | null | undefined = undefined;\n\tprivate gitPaths: GitPaths | null | undefined = undefined;\n\tprivate headWatcher: FSWatcher | null = null;\n\tprivate reftableWatcher: FSWatcher | null = null;\n\tprivate reftableTablesListWatcher: FSWatcher | null = null;\n\tprivate reftableTablesListPath: string | null = null;\n\tprivate branchChangeCallbacks = new Set<() => void>();\n\tprivate availableProviderCount = 0;\n\tprivate refreshTimer: ReturnType<typeof setTimeout> | null = null;\n\tprivate gitWatcherRetryTimer: ReturnType<typeof setTimeout> | null = null;\n\tprivate refreshInFlight = false;\n\tprivate refreshPending = false;\n\tprivate disposed = false;\n\n\tconstructor(cwd: string) {\n\t\tthis.cwd = cwd;\n\t\tthis.gitPaths = findGitPaths(cwd);\n\t\tthis.setupGitWatcher();\n\t}\n\n\t/** Current git branch, null if not in repo, \"detached\" if detached HEAD */\n\tgetGitBranch(): string | null {\n\t\tif (this.cachedBranch === undefined) {\n\t\t\tthis.cachedBranch = this.resolveGitBranchSync();\n\t\t}\n\t\treturn this.cachedBranch;\n\t}\n\n\t/** Extension status texts set via ctx.ui.setStatus() */\n\tgetExtensionStatuses(): ReadonlyMap<string, string> {\n\t\treturn this.extensionStatuses;\n\t}\n\n\t/** Subscribe to git branch changes. Returns unsubscribe function. */\n\tonBranchChange(callback: () => void): () => void {\n\t\tthis.branchChangeCallbacks.add(callback);\n\t\treturn () => this.branchChangeCallbacks.delete(callback);\n\t}\n\n\t/** Internal: set extension status */\n\tsetExtensionStatus(key: string, text: string | undefined): void {\n\t\tif (text === undefined) {\n\t\t\tthis.extensionStatuses.delete(key);\n\t\t} else {\n\t\t\tthis.extensionStatuses.set(key, text);\n\t\t}\n\t}\n\n\t/** Internal: clear extension statuses */\n\tclearExtensionStatuses(): void {\n\t\tthis.extensionStatuses.clear();\n\t}\n\n\t/** Number of unique providers with available models (for footer display) */\n\tgetAvailableProviderCount(): number {\n\t\treturn this.availableProviderCount;\n\t}\n\n\t/** Internal: update available provider count */\n\tsetAvailableProviderCount(count: number): void {\n\t\tthis.availableProviderCount = count;\n\t}\n\n\tsetCwd(cwd: string): void {\n\t\tif (this.cwd === cwd) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.cwd = cwd;\n\t\tif (this.refreshTimer) {\n\t\t\tclearTimeout(this.refreshTimer);\n\t\t\tthis.refreshTimer = null;\n\t\t}\n\t\tthis.clearGitWatchers();\n\t\tthis.cachedBranch = undefined;\n\t\tthis.gitPaths = findGitPaths(cwd);\n\t\tthis.setupGitWatcher();\n\t\tthis.notifyBranchChange();\n\t}\n\n\t/** Internal: cleanup */\n\tdispose(): void {\n\t\tthis.disposed = true;\n\t\tif (this.refreshTimer) {\n\t\t\tclearTimeout(this.refreshTimer);\n\t\t\tthis.refreshTimer = null;\n\t\t}\n\t\tthis.clearGitWatchers();\n\t\tthis.branchChangeCallbacks.clear();\n\t}\n\n\tprivate notifyBranchChange(): void {\n\t\tfor (const cb of this.branchChangeCallbacks) cb();\n\t}\n\n\tprivate scheduleRefresh(): void {\n\t\tif (this.disposed || this.refreshTimer) return;\n\t\tif (this.refreshInFlight) {\n\t\t\tthis.refreshPending = true;\n\t\t\treturn;\n\t\t}\n\t\tthis.refreshTimer = setTimeout(() => {\n\t\t\tthis.refreshTimer = null;\n\t\t\tvoid this.refreshGitBranchAsync();\n\t\t}, FooterDataProvider.WATCH_DEBOUNCE_MS);\n\t}\n\n\tprivate async refreshGitBranchAsync(): Promise<void> {\n\t\tif (this.disposed) return;\n\t\tif (this.refreshInFlight) {\n\t\t\tthis.refreshPending = true;\n\t\t\treturn;\n\t\t}\n\n\t\tthis.refreshInFlight = true;\n\t\ttry {\n\t\t\tconst nextBranch = await this.resolveGitBranchAsync();\n\t\t\tif (this.disposed) return;\n\t\t\tif (this.cachedBranch !== undefined && this.cachedBranch !== nextBranch) {\n\t\t\t\tthis.cachedBranch = nextBranch;\n\t\t\t\tthis.notifyBranchChange();\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.cachedBranch = nextBranch;\n\t\t} finally {\n\t\t\tthis.refreshInFlight = false;\n\t\t\tif (this.refreshPending && !this.disposed) {\n\t\t\t\tthis.refreshPending = false;\n\t\t\t\tthis.scheduleRefresh();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate resolveGitBranchSync(): string | null {\n\t\ttry {\n\t\t\tif (!this.gitPaths) return null;\n\t\t\tconst content = readFileSync(this.gitPaths.headPath, \"utf8\").trim();\n\t\t\tif (content.startsWith(\"ref: refs/heads/\")) {\n\t\t\t\tconst branch = content.slice(16);\n\t\t\t\treturn branch === \".invalid\" ? (resolveBranchWithGitSync(this.gitPaths.repoDir) ?? \"detached\") : branch;\n\t\t\t}\n\t\t\treturn \"detached\";\n\t\t} catch {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\tprivate async resolveGitBranchAsync(): Promise<string | null> {\n\t\ttry {\n\t\t\tif (!this.gitPaths) return null;\n\t\t\tconst content = readFileSync(this.gitPaths.headPath, \"utf8\").trim();\n\t\t\tif (content.startsWith(\"ref: refs/heads/\")) {\n\t\t\t\tconst branch = content.slice(16);\n\t\t\t\treturn branch === \".invalid\"\n\t\t\t\t\t? ((await resolveBranchWithGitAsync(this.gitPaths.repoDir)) ?? \"detached\")\n\t\t\t\t\t: branch;\n\t\t\t}\n\t\t\treturn \"detached\";\n\t\t} catch {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\tprivate clearGitWatchers(): void {\n\t\tcloseWatcher(this.headWatcher);\n\t\tthis.headWatcher = null;\n\t\tcloseWatcher(this.reftableWatcher);\n\t\tthis.reftableWatcher = null;\n\t\tcloseWatcher(this.reftableTablesListWatcher);\n\t\tthis.reftableTablesListWatcher = null;\n\t\tif (this.reftableTablesListPath) {\n\t\t\tunwatchFile(this.reftableTablesListPath);\n\t\t\tthis.reftableTablesListPath = null;\n\t\t}\n\t\tif (this.gitWatcherRetryTimer) {\n\t\t\tclearTimeout(this.gitWatcherRetryTimer);\n\t\t\tthis.gitWatcherRetryTimer = null;\n\t\t}\n\t}\n\n\tprivate scheduleGitWatcherRetry(): void {\n\t\tif (this.disposed || this.gitWatcherRetryTimer) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.gitWatcherRetryTimer = setTimeout(() => {\n\t\t\tthis.gitWatcherRetryTimer = null;\n\t\t\tthis.setupGitWatcher();\n\t\t}, FS_WATCH_RETRY_DELAY_MS);\n\t}\n\n\tprivate handleGitWatcherError(): void {\n\t\tthis.clearGitWatchers();\n\t\tthis.scheduleGitWatcherRetry();\n\t}\n\n\tprivate setupGitWatcher(): void {\n\t\tthis.clearGitWatchers();\n\t\tif (!this.gitPaths) return;\n\n\t\t// Watch the directory containing HEAD, not HEAD itself.\n\t\t// Git uses atomic writes (write temp, rename over HEAD), which changes the inode.\n\t\t// fs.watch on a file stops working after the inode changes.\n\t\tthis.headWatcher = watchWithErrorHandler(\n\t\t\tdirname(this.gitPaths.headPath),\n\t\t\t(_eventType, filename) => {\n\t\t\t\tif (!filename || filename === \"HEAD\") {\n\t\t\t\t\tthis.scheduleRefresh();\n\t\t\t\t}\n\t\t\t},\n\t\t\t() => this.handleGitWatcherError(),\n\t\t);\n\t\tif (!this.headWatcher) {\n\t\t\treturn;\n\t\t}\n\n\t\t// In reftable repos, branch switches update files in the reftable directory\n\t\t// instead of HEAD. Watch it separately so the footer picks up those changes.\n\t\tconst reftableDir = join(this.gitPaths.commonGitDir, \"reftable\");\n\t\tif (existsSync(reftableDir)) {\n\t\t\tthis.reftableWatcher = watchWithErrorHandler(\n\t\t\t\treftableDir,\n\t\t\t\t() => {\n\t\t\t\t\tthis.scheduleRefresh();\n\t\t\t\t},\n\t\t\t\t() => this.handleGitWatcherError(),\n\t\t\t);\n\t\t\tif (!this.reftableWatcher) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst tablesListPath = join(reftableDir, \"tables.list\");\n\t\t\tif (existsSync(tablesListPath)) {\n\t\t\t\tthis.reftableTablesListPath = tablesListPath;\n\t\t\t\tthis.reftableTablesListWatcher = watchWithErrorHandler(\n\t\t\t\t\ttablesListPath,\n\t\t\t\t\t() => {\n\t\t\t\t\t\tthis.scheduleRefresh();\n\t\t\t\t\t},\n\t\t\t\t\t() => this.handleGitWatcherError(),\n\t\t\t\t);\n\t\t\t\tif (!this.reftableTablesListWatcher) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\twatchFile(tablesListPath, { interval: 250 }, (current, previous) => {\n\t\t\t\t\tif (\n\t\t\t\t\t\tcurrent.mtimeMs !== previous.mtimeMs ||\n\t\t\t\t\t\tcurrent.ctimeMs !== previous.ctimeMs ||\n\t\t\t\t\t\tcurrent.size !== previous.size\n\t\t\t\t\t) {\n\t\t\t\t\t\tthis.scheduleRefresh();\n\t\t\t\t\t}\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t}\n}\n\n/** Read-only view for extensions - excludes setExtensionStatus, setAvailableProviderCount and dispose */\nexport type ReadonlyFooterDataProvider = Pick<\n\tFooterDataProvider,\n\t\"getGitBranch\" | \"getExtensionStatuses\" | \"getAvailableProviderCount\" | \"onBranchChange\"\n>;\n"]}