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filesystem.ts
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import { chmod, mkdir, readFile, writeFile } from "fs/promises"
import { createWriteStream, existsSync, statSync } from "fs"
import { lookup } from "mime-types"
import { realpathSync } from "fs"
import { dirname, join, relative, resolve as pathResolve } from "path"
import { Readable } from "stream"
import { pipeline } from "stream/promises"
import { Glob } from "./glob"
export namespace Filesystem {
// Fast sync version for metadata checks
export async function exists(p: string): Promise<boolean> {
return existsSync(p)
}
export async function isDir(p: string): Promise<boolean> {
try {
return statSync(p).isDirectory()
} catch {
return false
}
}
export function stat(p: string): ReturnType<typeof statSync> | undefined {
return statSync(p, { throwIfNoEntry: false }) ?? undefined
}
export async function size(p: string): Promise<number> {
const s = stat(p)?.size ?? 0
return typeof s === "bigint" ? Number(s) : s
}
export async function readText(p: string): Promise<string> {
return readFile(p, "utf-8")
}
export async function readJson<T = any>(p: string): Promise<T> {
return JSON.parse(await readFile(p, "utf-8"))
}
export async function readBytes(p: string): Promise<Buffer> {
return readFile(p)
}
export async function readArrayBuffer(p: string): Promise<ArrayBuffer> {
const buf = await readFile(p)
return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength) as ArrayBuffer
}
function isEnoent(e: unknown): e is { code: "ENOENT" } {
return typeof e === "object" && e !== null && "code" in e && (e as { code: string }).code === "ENOENT"
}
export async function write(p: string, content: string | Buffer | Uint8Array, mode?: number): Promise<void> {
try {
if (mode) {
await writeFile(p, content, { mode })
} else {
await writeFile(p, content)
}
} catch (e) {
if (isEnoent(e)) {
await mkdir(dirname(p), { recursive: true })
if (mode) {
await writeFile(p, content, { mode })
} else {
await writeFile(p, content)
}
return
}
throw e
}
}
export async function writeJson(p: string, data: unknown, mode?: number): Promise<void> {
return write(p, JSON.stringify(data, null, 2), mode)
}
export async function writeStream(
p: string,
stream: ReadableStream<Uint8Array> | Readable,
mode?: number,
): Promise<void> {
const dir = dirname(p)
if (!existsSync(dir)) {
await mkdir(dir, { recursive: true })
}
const nodeStream = stream instanceof ReadableStream ? Readable.fromWeb(stream as any) : stream
const writeStream = createWriteStream(p)
await pipeline(nodeStream, writeStream)
if (mode) {
await chmod(p, mode)
}
}
export function mimeType(p: string): string {
return lookup(p) || "application/octet-stream"
}
/**
* On Windows, normalize a path to its canonical casing using the filesystem.
* This is needed because Windows paths are case-insensitive but LSP servers
* may return paths with different casing than what we send them.
*/
export function normalizePath(p: string): string {
if (process.platform !== "win32") return p
try {
return realpathSync.native(p)
} catch {
return p
}
}
// We cannot rely on path.resolve() here because git.exe may come from Git Bash, Cygwin, or MSYS2, so we need to translate these paths at the boundary.
export function resolve(p: string): string {
return normalizePath(pathResolve(windowsPath(p)))
}
export function windowsPath(p: string): string {
if (process.platform !== "win32") return p
return (
p
.replace(/^\/([a-zA-Z]):(?:[\\/]|$)/, (_, drive) => `${drive.toUpperCase()}:/`)
// Git Bash for Windows paths are typically /<drive>/...
.replace(/^\/([a-zA-Z])(?:\/|$)/, (_, drive) => `${drive.toUpperCase()}:/`)
// Cygwin git paths are typically /cygdrive/<drive>/...
.replace(/^\/cygdrive\/([a-zA-Z])(?:\/|$)/, (_, drive) => `${drive.toUpperCase()}:/`)
// WSL paths are typically /mnt/<drive>/...
.replace(/^\/mnt\/([a-zA-Z])(?:\/|$)/, (_, drive) => `${drive.toUpperCase()}:/`)
)
}
export function overlaps(a: string, b: string) {
const relA = relative(a, b)
const relB = relative(b, a)
return !relA || !relA.startsWith("..") || !relB || !relB.startsWith("..")
}
export function contains(parent: string, child: string) {
return !relative(parent, child).startsWith("..")
}
export async function findUp(target: string, start: string, stop?: string) {
let current = start
const result = []
while (true) {
const search = join(current, target)
if (await exists(search)) result.push(search)
if (stop === current) break
const parent = dirname(current)
if (parent === current) break
current = parent
}
return result
}
export async function* up(options: { targets: string[]; start: string; stop?: string }) {
const { targets, start, stop } = options
let current = start
while (true) {
for (const target of targets) {
const search = join(current, target)
if (await exists(search)) yield search
}
if (stop === current) break
const parent = dirname(current)
if (parent === current) break
current = parent
}
}
export async function globUp(pattern: string, start: string, stop?: string) {
let current = start
const result = []
while (true) {
try {
const matches = await Glob.scan(pattern, {
cwd: current,
absolute: true,
include: "file",
dot: true,
})
result.push(...matches)
} catch {
// Skip invalid glob patterns
}
if (stop === current) break
const parent = dirname(current)
if (parent === current) break
current = parent
}
return result
}
}