{"version":3,"file":"index.mjs","names":["FileLock.make"],"sources":["../../../tooling/shared/src/run.ts","../src/file-lock.ts","../src/snapshot.ts","../src/index.ts"],"sourcesContent":["import { Cause, Effect, Exit, Inspectable } from 'effect'\n\n// What pi's own tools throw for a cancelled run, so interrupted plugin runs\n// read like interrupted builtins.\nconst ABORT_MESSAGE = 'Operation aborted'\n\nexport interface RunOptions {\n readonly signal?: AbortSignal | undefined\n}\n\n// Defects keep their stack because they are bugs, and win over failures in a\n// mixed cause.\nfunction causeMessage(cause: Cause.Cause): string {\n if (Cause.hasInterruptsOnly(cause)) {\n return ABORT_MESSAGE\n }\n if (Cause.hasDies(cause)) {\n return Cause.pretty(cause)\n }\n return cause.reasons\n .filter(Cause.isFailReason)\n .map(({ error }) => {\n if (error instanceof Error) {\n return error.message || error.name\n }\n return typeof error === 'string' ? error : Inspectable.toStringUnknown(error)\n })\n .join('\\n')\n}\n\n/**\n * Failure rejects with an `Error` whose message is what the model reads back\n * as the tool result, so it is written for the model rather than for a log.\n */\nexport async function runTool(\n effect: Effect.Effect,\n options?: RunOptions,\n): Promise {\n const exit = await Effect.runPromiseExit(effect, options)\n if (Exit.isFailure(exit)) {\n throw new Error(causeMessage(exit.cause))\n }\n return exit.value\n}\n\nexport interface RunHandlerOptions {\n readonly onError?: (message: string) => B\n}\n\n/**\n * For boundaries where pi reports rejections but expected failures should\n * degrade gracefully (event hooks, commands, background work). Expected\n * failures and interrupts never reject. Without `onError` they vanish, while\n * defects rethrow so pi's handler boundary reports the bug.\n */\nexport async function runHandler(\n effect: Effect.Effect,\n options?: RunHandlerOptions,\n): Promise {\n const exit = await Effect.runPromiseExit(effect)\n if (Exit.isSuccess(exit)) {\n return exit.value\n }\n if (options?.onError) {\n return options.onError(causeMessage(exit.cause))\n }\n const die = exit.cause.reasons.find(Cause.isDieReason)\n if (die !== undefined) {\n throw die.defect\n }\n return undefined as B\n}\n","import {\n Data,\n DateTime,\n Duration,\n Effect,\n FileSystem,\n Option,\n Schedule,\n Scope,\n} from 'effect'\n\n/** Failed to acquire the lock in time, or the attempt itself errored. */\nexport class FileLockError extends Data.TaggedError('FileLockError')<{\n lockPath: string\n cause: unknown\n}> {\n override get message(): string {\n return `Could not acquire file lock: ${this.lockPath}`\n }\n}\n\n/** An inter-process lock backed by a lock directory on disk. */\nexport interface FileLock {\n /** Runs `self` while holding the lock. */\n withLock(\n self: Effect.Effect,\n ): Effect.Effect\n}\n\n/**\n * Creates an inter-process `FileLock` at `lockPath`.\n *\n * Waiters fail with a `FileLockError` after 10 seconds. Abandoned locks are\n * broken: holders refresh the lock's mtime every 10 seconds, and a lock not\n * refreshed for 30 seconds is considered dead.\n */\nexport const make = Effect.fnUntraced(function* (lockPath: string) {\n const fs = yield* FileSystem.FileSystem\n\n /** Removes the lock if its holder stopped heartbeating (e.g. was killed). */\n const breakIfStale = Effect.fnUntraced(function* () {\n const { mtime } = yield* fs.stat(lockPath)\n const now = yield* DateTime.now\n const stale = Option.exists(mtime, (time) =>\n Duration.isGreaterThan(\n DateTime.distance(DateTime.fromDateUnsafe(time), now),\n Duration.seconds(30),\n ),\n )\n if (stale) {\n yield* fs.remove(lockPath, { recursive: true })\n }\n }, Effect.ignore)\n\n // Uninterruptible `makeDirectory` acquire; the polling between attempts\n // stays interruptible.\n const acquire = Effect.acquireRelease(fs.makeDirectory(lockPath), () =>\n Effect.ignore(fs.remove(lockPath, { recursive: true })),\n ).pipe(\n Effect.tapError((error) =>\n error.reason._tag === 'AlreadyExists' ? breakIfStale() : Effect.void,\n ),\n Effect.retry({\n while: (error) => error.reason._tag === 'AlreadyExists',\n schedule: Schedule.spaced('100 millis').pipe(\n Schedule.upTo({ duration: '10 seconds' }),\n ),\n }),\n Effect.mapError((cause) => new FileLockError({ lockPath, cause })),\n )\n\n /** Marks the lock as live so waiters do not break it. */\n const heartbeat = Effect.gen(function* () {\n const now = yield* DateTime.nowAsDate\n yield* fs.utimes(lockPath, now, now)\n }).pipe(Effect.ignore, Effect.repeat(Schedule.spaced('10 seconds')))\n\n const lock: FileLock = {\n withLock: (self) =>\n Effect.scopedWith((scope) =>\n Effect.gen(function* () {\n yield* Scope.provide(scope)(acquire)\n yield* Scope.provide(scope)(Effect.forkScoped(heartbeat))\n return yield* self\n }),\n ),\n }\n\n return lock\n})\n","import { getAgentDir } from '@earendil-works/pi-coding-agent'\nimport {\n Array,\n Context,\n Crypto,\n Effect,\n Encoding,\n Fiber,\n FileSystem,\n Layer,\n Path,\n pipe,\n Schema,\n Stream,\n String,\n} from 'effect'\nimport { ChildProcess, ChildProcessSpawner } from 'effect/unstable/process'\nimport * as FileLock from './file-lock'\n\nexport class SnapshotterError extends Schema.TaggedErrorClass()(\n 'SnapshotterError',\n {\n kind: Schema.Literals(['GitError', 'GitTimeout', 'NotAWorktree']),\n message: Schema.String,\n cause: Schema.optional(Schema.Defect()),\n },\n) {}\n\n/**\n * Snapshots the git worktree containing `cwd` into a shadow repository (a\n * separate `GIT_DIR` outside the project).\n *\n * `make` fails with a `NotAWorktree` error outside git worktrees.\n */\nexport class Snapshotter extends Context.Service()(\n '@pi-plugins/checkpoint/Snapshotter',\n {\n make: Effect.fnUntraced(function* (cwd: string) {\n const fs = yield* FileSystem.FileSystem\n const path = yield* Path.Path\n const crypto = yield* Crypto.Crypto\n const spawner = yield* ChildProcessSpawner.ChildProcessSpawner\n\n /**\n * Runs `git args` in `dir` and returns its stdout, failing with a\n * `GitError` on non-zero exit. Invocations are killed after a timeout\n * so a hung git process cannot stall the agent's hooks indefinitely.\n */\n const git = Effect.fnUntraced(\n function* (args: readonly string[], dir: string) {\n const handle = yield* spawner.spawn(\n ChildProcess.make('git', args, {\n cwd: dir,\n forceKillAfter: '5 seconds',\n }),\n )\n const stderrFiber = yield* Effect.forkScoped(\n Stream.mkString(Stream.decodeText(handle.stderr)),\n )\n const stdout = yield* Stream.mkString(Stream.decodeText(handle.stdout))\n const exitCode = Number(yield* handle.exitCode)\n const stderr = yield* Fiber.join(stderrFiber)\n\n if (exitCode !== 0) {\n return yield* new SnapshotterError({\n kind: 'GitError',\n message:\n `git ${args.join(' ')} exited with ${exitCode}` +\n (stderr.trim() ? `: ${stderr.trim()}` : ''),\n })\n }\n\n return stdout\n },\n (effect, args) =>\n effect.pipe(\n Effect.scoped,\n Effect.timeoutOrElse({\n duration: '1 minute',\n orElse: () =>\n new SnapshotterError({\n kind: 'GitTimeout',\n message: `git ${args.join(' ')} timed out after 1 minute`,\n }),\n }),\n ),\n )\n\n /**\n * Wraps `args` with the arguments that point git at the shadow\n * repository and additional safety configuration.\n */\n const shadowGit = (args: readonly string[]): readonly string[] => [\n '-c',\n 'core.autocrlf=false',\n '-c',\n 'core.quotepath=false',\n '-c',\n 'core.fsmonitor=false',\n '--git-dir',\n gitdir,\n '--work-tree',\n worktree,\n ...args,\n ]\n\n // Resolve the canonical repository root by which the shadow `GIT_DIR` is keyed.\n const worktree = yield* git(['rev-parse', '--show-toplevel'], cwd).pipe(\n Effect.map(String.trim),\n Effect.catchTag('SnapshotterError', (error) =>\n error.kind === 'GitError'\n ? new SnapshotterError({\n kind: 'NotAWorktree',\n message: `Not a git worktree: ${cwd}`,\n })\n : Effect.fail(error),\n ),\n )\n if (String.isEmpty(worktree)) {\n return yield* new SnapshotterError({\n kind: 'NotAWorktree',\n message: `Not a git worktree: ${cwd}`,\n })\n }\n\n const digest = yield* crypto.digest(\n 'SHA-256',\n new TextEncoder().encode(worktree),\n )\n const gitdir = path.join(\n getAgentDir(),\n 'checkpoints',\n Encoding.encodeHex(digest).slice(0, 16),\n )\n\n yield* fs.makeDirectory(gitdir, { recursive: true })\n const lock = yield* FileLock.make(path.join(gitdir, 'checkpoint.lock'))\n\n yield* lock.withLock(\n Effect.gen(function* () {\n if (!(yield* fs.exists(path.join(gitdir, 'HEAD')))) {\n yield* git(shadowGit(['init', '--quiet']), worktree)\n }\n }),\n )\n\n /**\n * Lists the paths currently tracked by the shadow index.\n */\n const listIndexFiles = Effect.fnUntraced(function* () {\n const out = yield* git(shadowGit(['ls-files', '-z']), worktree)\n return pipe(out, String.split('\\0'), Array.filter(String.isNonEmpty))\n })\n\n /**\n * Creates a snapshot of the current worktree state.\n */\n const track = Effect.fn('Snapshotter.track')(function* () {\n yield* git(shadowGit(['add', '--all']), worktree)\n return yield* git(shadowGit(['write-tree']), worktree).pipe(\n Effect.map(String.trim),\n )\n }, lock.withLock)\n\n /**\n * Applies a snapshot to the worktree: checks out its files and deletes\n * files tracked in the shadow index but absent from the snapshot.\n * Assumes the shadow index reflects the current worktree state.\n */\n const applyTree = Effect.fnUntraced(function* (tree: string) {\n const before = yield* listIndexFiles()\n yield* git(shadowGit(['read-tree', tree]), worktree)\n yield* git(shadowGit(['checkout-index', '--all', '--force']), worktree)\n const after = new Set(yield* listIndexFiles())\n\n yield* Effect.forEach(\n before.filter((file) => !after.has(file)),\n (file) => Effect.ignore(fs.remove(path.join(worktree, file))),\n { discard: true, concurrency: 'unbounded' },\n )\n })\n\n /**\n * Restores the worktree to the state of a snapshot, deleting files that\n * were present in the worktree but not in the snapshot.\n *\n * A failed restore is rolled back to the pre-restore state so that a\n * partial checkout never leaves the worktree in a mixed state.\n */\n const restore = Effect.fn('Snapshotter.restore')(function* (tree: string) {\n // Snapshot the current state as the rollback point.\n yield* git(shadowGit(['add', '--all']), worktree)\n const current = yield* git(shadowGit(['write-tree']), worktree).pipe(\n Effect.map(String.trim),\n )\n\n yield* applyTree(tree).pipe(\n Effect.tapError((error) =>\n applyTree(current).pipe(\n Effect.mapError(\n (rollbackError) =>\n new SnapshotterError({\n kind: 'GitError',\n message: `${error.message} (rollback also failed: ${rollbackError.message})`,\n cause: error,\n }),\n ),\n ),\n ),\n )\n }, lock.withLock)\n\n /**\n * Prunes all stored checkpoint objects and records the current worktree\n * as a fresh baseline so checkpointing can continue immediately.\n */\n const cleanup = Effect.fn('Snapshotter.cleanup')(function* () {\n const index = path.join(gitdir, 'index')\n if (yield* fs.exists(index)) {\n yield* fs.remove(index)\n }\n yield* git(\n shadowGit(['reflog', 'expire', '--expire=now', '--all']),\n worktree,\n )\n yield* git(shadowGit(['gc', '--prune=now', '--quiet']), worktree)\n yield* git(shadowGit(['add', '--all']), worktree)\n return yield* git(shadowGit(['write-tree']), worktree).pipe(\n Effect.map(String.trim),\n )\n }, lock.withLock)\n\n return { track, restore, cleanup } as const\n }),\n },\n) {\n static readonly layer = (cwd: string) => Layer.effect(this, this.make(cwd))\n}\n","import type {\n ExtensionAPI,\n ExtensionContext,\n SessionEntry,\n} from '@earendil-works/pi-coding-agent'\nimport * as NodeServices from '@effect/platform-node/NodeServices'\nimport { runHandler } from '@pi-plugins/shared/run'\nimport { Array, Effect, Option, pipe, Schema } from 'effect'\nimport { Snapshotter, SnapshotterError } from './snapshot'\n\n/** `customType` of the hidden session entries that carry a snapshot tree hash. */\nconst CHECKPOINT_TYPE = 'file-checkpoint'\n\n/** User-facing choices when navigating to a point with a different file state. */\nconst CHOICE_CONVERSATION = 'Conversation only (keep files as they are)'\nconst CHOICE_RESTORE = 'Conversation and files'\nconst CHOICE_CANCEL = 'Cancel navigation'\n\n/** The tree hash stored on `entry`, if it is one of our checkpoint entries. */\nfunction checkpointOf(entry: SessionEntry | undefined): string | undefined {\n if (entry?.type !== 'custom' || entry.customType !== CHECKPOINT_TYPE) {\n return undefined\n }\n\n return pipe(\n Schema.decodeUnknownOption(Schema.Struct({ tree: Schema.String }))(entry.data),\n Option.map((data) => data.tree),\n Option.getOrUndefined,\n )\n}\n\n/** Nearest checkpoint at or above `fromId` in the session tree. */\nfunction nearestCheckpoint(\n session: ExtensionContext['sessionManager'],\n fromId: string | null,\n): string | undefined {\n for (let id = fromId; id !== null;) {\n const entry = session.getEntry(id)\n if (!entry) {\n return undefined\n }\n\n const tree = checkpointOf(entry)\n if (tree) {\n return tree\n }\n\n id = entry.parentId\n }\n\n return undefined\n}\n\n/**\n * The file state associated with navigating to `targetId`: a checkpoint\n * directly below the target, or the nearest ancestor checkpoint.\n */\nfunction restoreTree(\n session: ExtensionContext['sessionManager'],\n targetId: string,\n): string | undefined {\n return pipe(\n session.getEntries(),\n Array.findFirst((entry) =>\n entry.parentId === targetId\n ? Option.fromUndefinedOr(checkpointOf(entry))\n : Option.none(),\n ),\n Option.getOrElse(() => nearestCheckpoint(session, targetId)),\n )\n}\n\nexport default function checkpoint(pi: ExtensionAPI) {\n let snapshotter: Snapshotter['Service'] | undefined\n\n pi.on('session_start', async (_event, ctx) => {\n // Only active inside git worktrees.\n snapshotter = await runHandler(\n Snapshotter.make(ctx.cwd).pipe(\n Effect.provide(NodeServices.layer),\n // Being outside a worktree is the normal way to have no snapshotter.\n Effect.catchIf(\n (error) =>\n error instanceof SnapshotterError && error.kind === 'NotAWorktree',\n () => Effect.succeed(undefined),\n ),\n ),\n {\n onError: (message) => {\n if (ctx.hasUI) {\n ctx.ui.notify(`Checkpoints disabled: ${message}`, 'warning')\n }\n return undefined\n },\n },\n )\n })\n\n /**\n * Records the current file state as a checkpoint at the current leaf,\n * skipping entries when the branch already ends in an identical state.\n * Running on both `turn_start` and `turn_end` brackets every turn with a\n * before/after snapshot pair.\n */\n const recordCheckpoint = async (ctx: ExtensionContext) => {\n if (!snapshotter) {\n return\n }\n // Current worktree state as a tree hash, or undefined when tracking fails.\n const tree = await runHandler(snapshotter.track())\n if (!tree) {\n return\n }\n const session = ctx.sessionManager\n if (nearestCheckpoint(session, session.getLeafId()) !== tree) {\n pi.appendEntry(CHECKPOINT_TYPE, { tree })\n }\n }\n\n pi.on('turn_start', async (_event, ctx) => recordCheckpoint(ctx))\n pi.on('turn_end', async (_event, ctx) => recordCheckpoint(ctx))\n\n pi.registerCommand('checkpoint-cleanup', {\n description: 'Delete stored file checkpoint history for this worktree',\n handler: async (_args, ctx) => {\n await ctx.waitForIdle()\n if (!snapshotter || !ctx.hasUI) {\n return undefined\n }\n\n if (\n !(await ctx.ui.confirm(\n 'Delete file checkpoints?',\n 'This removes the stored file history for every session in this worktree. Conversation history is not affected.',\n ))\n ) {\n return undefined\n }\n\n await runHandler(\n snapshotter.cleanup().pipe(\n Effect.tap((tree) =>\n Effect.sync(() => {\n const session = ctx.sessionManager\n if (nearestCheckpoint(session, session.getLeafId()) !== tree) {\n pi.appendEntry(CHECKPOINT_TYPE, { tree })\n }\n ctx.ui.notify('File checkpoint history cleaned up', 'info')\n }),\n ),\n ),\n {\n onError: (message) => {\n ctx.ui.notify(`Checkpoint cleanup failed: ${message}`, 'error')\n },\n },\n )\n },\n })\n\n pi.on('session_before_tree', async (event, ctx) => {\n if (!snapshotter || !ctx.hasUI) {\n return undefined\n }\n const session = ctx.sessionManager\n const target = restoreTree(session, event.preparation.targetId)\n if (!target) {\n return undefined\n }\n\n const current = await runHandler(snapshotter.track())\n if (!current || current === target) {\n return undefined\n }\n\n const choice = await ctx.ui.select(\n 'Files changed since that point in the conversation. What should be restored?',\n [CHOICE_CONVERSATION, CHOICE_RESTORE, CHOICE_CANCEL],\n )\n if (choice !== CHOICE_RESTORE) {\n return choice === CHOICE_CANCEL ? { cancel: true } : undefined\n }\n\n // Preserve the abandoned state on the old branch so that navigating back\n // to it can restore the files again (redo).\n if (nearestCheckpoint(session, session.getLeafId()) !== current) {\n pi.appendEntry(CHECKPOINT_TYPE, { tree: current })\n }\n\n return runHandler(\n snapshotter.restore(target).pipe(\n Effect.map(() => {\n ctx.ui.notify('Files restored to the selected point', 'info')\n return undefined\n }),\n ),\n {\n onError: (message) => {\n ctx.ui.notify(`File restore failed: ${message}`, 'error')\n return { cancel: true }\n },\n },\n )\n 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