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129 lines
3.3 KiB
JavaScript
129 lines
3.3 KiB
JavaScript
'use strict'
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// This is adapted from https://github.com/normalize/mz
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// Copyright (c) 2014-2016 Jonathan Ong me@jongleberry.com and Contributors
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const u = require('universalify').fromCallback
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const fs = require('graceful-fs')
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const api = [
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'access',
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'appendFile',
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'chmod',
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'chown',
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'close',
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'copyFile',
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'fchmod',
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'fchown',
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'fdatasync',
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'fstat',
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'fsync',
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'ftruncate',
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'futimes',
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'lchmod',
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'lchown',
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'link',
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'lstat',
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'mkdir',
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'mkdtemp',
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'open',
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'opendir',
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'readdir',
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'readFile',
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'readlink',
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'realpath',
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'rename',
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'rm',
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'rmdir',
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'stat',
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'symlink',
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'truncate',
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'unlink',
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'utimes',
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'writeFile'
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].filter(key => {
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// Some commands are not available on some systems. Ex:
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// fs.opendir was added in Node.js v12.12.0
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// fs.rm was added in Node.js v14.14.0
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// fs.lchown is not available on at least some Linux
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return typeof fs[key] === 'function'
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})
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// Export cloned fs:
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Object.assign(exports, fs)
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// Universalify async methods:
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api.forEach(method => {
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exports[method] = u(fs[method])
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})
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// We differ from mz/fs in that we still ship the old, broken, fs.exists()
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// since we are a drop-in replacement for the native module
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exports.exists = function (filename, callback) {
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if (typeof callback === 'function') {
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return fs.exists(filename, callback)
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}
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return new Promise(resolve => {
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return fs.exists(filename, resolve)
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})
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}
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// fs.read(), fs.write(), & fs.writev() need special treatment due to multiple callback args
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exports.read = function (fd, buffer, offset, length, position, callback) {
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if (typeof callback === 'function') {
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return fs.read(fd, buffer, offset, length, position, callback)
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}
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return new Promise((resolve, reject) => {
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fs.read(fd, buffer, offset, length, position, (err, bytesRead, buffer) => {
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if (err) return reject(err)
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resolve({ bytesRead, buffer })
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})
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})
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}
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// Function signature can be
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// fs.write(fd, buffer[, offset[, length[, position]]], callback)
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// OR
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// fs.write(fd, string[, position[, encoding]], callback)
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// We need to handle both cases, so we use ...args
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exports.write = function (fd, buffer, ...args) {
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if (typeof args[args.length - 1] === 'function') {
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return fs.write(fd, buffer, ...args)
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}
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return new Promise((resolve, reject) => {
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fs.write(fd, buffer, ...args, (err, bytesWritten, buffer) => {
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if (err) return reject(err)
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resolve({ bytesWritten, buffer })
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})
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})
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}
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// fs.writev only available in Node v12.9.0+
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if (typeof fs.writev === 'function') {
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// Function signature is
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// s.writev(fd, buffers[, position], callback)
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// We need to handle the optional arg, so we use ...args
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exports.writev = function (fd, buffers, ...args) {
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if (typeof args[args.length - 1] === 'function') {
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return fs.writev(fd, buffers, ...args)
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}
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return new Promise((resolve, reject) => {
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fs.writev(fd, buffers, ...args, (err, bytesWritten, buffers) => {
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if (err) return reject(err)
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resolve({ bytesWritten, buffers })
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})
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})
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}
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}
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// fs.realpath.native sometimes not available if fs is monkey-patched
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if (typeof fs.realpath.native === 'function') {
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exports.realpath.native = u(fs.realpath.native)
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} else {
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process.emitWarning(
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'fs.realpath.native is not a function. Is fs being monkey-patched?',
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'Warning', 'fs-extra-WARN0003'
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)
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}
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