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// This is adapted from https://github.com/normalize/mz
// Copyright (c) 2014-2016 Jonathan Ong me@jongleberry.com and Contributors
const u = require('universalify').fromCallback
const fs = require('graceful-fs')
const api = [
'access',
'appendFile',
'chmod',
'chown',
'close',
'copyFile',
'fchmod',
'fchown',
'fdatasync',
'fstat',
'fsync',
'ftruncate',
'futimes',
'lchown',
'link',
'lstat',
'mkdir',
'mkdtemp',
'open',
'readFile',
'readdir',
'readlink',
'realpath',
'rename',
'rmdir',
'stat',
'symlink',
'truncate',
'unlink',
'utimes',
'writeFile'
].filter(key => {
// Some commands are not available on some systems. Ex:
// fs.copyFile was added in Node.js v8.5.0
// fs.mkdtemp was added in Node.js v5.10.0
// fs.lchown is not available on at least some Linux
return typeof fs[key] === 'function'
})
// Export all keys:
Object.keys(fs).forEach(key => {
exports[key] = fs[key]
})
// Universalify async methods:
api.forEach(method => {
exports[method] = u(fs[method])
})
// We differ from mz/fs in that we still ship the old, broken, fs.exists()
// since we are a drop-in replacement for the native module
exports.exists = function (filename, callback) {
if (typeof callback === 'function') {
return fs.exists(filename, callback)
}
return new Promise(resolve => {
return fs.exists(filename, resolve)
})
}
// fs.read() & fs.write need special treatment due to multiple callback args
exports.read = function (fd, buffer, offset, length, position, callback) {
if (typeof callback === 'function') {
return fs.read(fd, buffer, offset, length, position, callback)
}
return new Promise((resolve, reject) => {
fs.read(fd, buffer, offset, length, position, (err, bytesRead, buffer) => {
if (err) return reject(err)
resolve({ bytesRead, buffer })
})
})
}
// Function signature can be
// fs.write(fd, buffer[, offset[, length[, position]]], callback)
// OR
// fs.write(fd, string[, position[, encoding]], callback)
// so we need to handle both cases
exports.write = function (fd, buffer, a, b, c, callback) {
if (typeof arguments[arguments.length - 1] === 'function') {
return fs.write(fd, buffer, a, b, c, callback)
}
// Check for old, depricated fs.write(fd, string[, position[, encoding]], callback)
if (typeof buffer === 'string') {
return new Promise((resolve, reject) => {
fs.write(fd, buffer, a, b, (err, bytesWritten, buffer) => {
if (err) return reject(err)
resolve({ bytesWritten, buffer })
})
})
}
return new Promise((resolve, reject) => {
fs.write(fd, buffer, a, b, c, (err, bytesWritten, buffer) => {
if (err) return reject(err)
resolve({ bytesWritten, buffer })
})
})
}
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