| 1 | import * as Effect from "effect/Effect"; |
| 2 | import * as FileSystem from "effect/FileSystem"; |
| 3 | import * as Path from "effect/Path"; |
| 4 | import { resolveSymlinkTarget } from "@t3tools/shared/symlink"; |
| 5 | |
| 6 | /** |
| 7 | * Replaces a file's contents via a sibling temp file and rename. A symlinked |
| 8 | * target is resolved first so the link survives and its destination is |
| 9 | * rewritten, since renaming over the link itself would swap it for a regular file. |
| 10 | */ |
| 11 | export const writeFileStringAtomically = (input: { |
| 12 | readonly filePath: string; |
| 13 | readonly contents: string; |
| 14 | }) => |
| 15 | Effect.scoped( |
| 16 | Effect.gen(function* () { |
| 17 | const fs = yield* FileSystem.FileSystem; |
| 18 | const path = yield* Path.Path; |
| 19 | const targetPath = yield* resolveSymlinkTarget(input.filePath); |
| 20 | const targetDirectory = path.dirname(targetPath); |
| 21 | |
| 22 | yield* fs.makeDirectory(targetDirectory, { recursive: true }); |
| 23 | // The temp directory is cleanup, not part of the write: failing to remove |
| 24 | // it (a virus scanner holding it on Windows) must not fail a write that |
| 25 | // already landed. |
| 26 | const tempDirectory = yield* Effect.acquireRelease( |
| 27 | fs.makeTempDirectory({ |
| 28 | directory: targetDirectory, |
| 29 | prefix: `${path.basename(targetPath)}.`, |
| 30 | }), |
| 31 | (directory) => fs.remove(directory, { recursive: true }).pipe(Effect.ignore({ log: true })), |
| 32 | ); |
| 33 | const tempPath = path.join(tempDirectory, "contents.tmp"); |
| 34 | |
| 35 | yield* fs.writeFileString(tempPath, input.contents); |
| 36 | yield* fs.rename(tempPath, targetPath); |
| 37 | }), |
| 38 | ); |