Sobesednikwrote
Promise-based write and read operations for Node.js
ES5
The package uses some newer language features. For your convenience, it's been transpiled to be compatible with Node 4. You can use the following snippet.
const wrote = require('wrote/es5/src/')wrote.createWritable(path=: string): Promise.<Writable>
Create an open Writable stream to the file.
const { Writable } = require('stream')
const path = require('path')
const HOME_DIR = require('os').homedir()
const { createWritable } = require('wrote')
const file = path.join(HOME_DIR, `wrote-${Math.floor(Math.random() * 1e5)}.data`);
(async () => {
const ws = await createWritable(file)
console.log(ws instanceof Writable) // true
console.log(ws.path) // ~/wrote-35558.data
})()If you don't have a file, a new one in the temp directory will be created for you.
(async () => {
const ws = await createWritable()
console.log(ws instanceof Writable) // true
console.log(ws.path) // /var/folders/s0/1h2g/T/wrote-48315.data
})()wrote.exists(path: string): Promise.<boolean>
Check if the path on the filesystem exists. Throws if path is not accessible due to permissions.
const { exists } = require('wrote');
(async () => {
await exists('unknown-path') // false
await exists(__filename) // true
await exists(__dirname) // true
})()wrote.assertExists(path: string): Promise
Check if the path on the filesystem exists, and throw if it does not, or cannot be accessed.
const { assertExists } = require('wrote');
(async () => {
try {
await assertExists('unknown-path')
} catch (err) {
console.log(err) // Path unknown-path does not exist.
}
await assertExists(__filename) // ok
})()wrote.assertDoesNotExist(path: string): Promise
Check if the path on the filesystem does not exists, and throw if it does, or cannot be accessed.
const { assertDoesNotExist } = require('wrote');
(async () => {
try {
await assertDoesNotExist(__filename)
} catch (err) {
console.log(err) // Path /wrote/examples/assert-does-not-exist.js exists.
}
await assertDoesNotExist('unknown-file') // ok
})()wrote.clone({ from: string, to: string, regexes: [] }): Promise
Clone a directory by copying contents of files and creating symlinks. Regular expressions can be used to transform data being copied.
const { clone } = require('wrote');
(async () => {
const from = './directory'
const to = './clone'
await clone({
from,
to,
regexes: [
{
re: /{{ name }}/g, // use /g flag for global replacements
replacement: 'Garry',
},
{
re: /{{ age }}/,
replacement: '30',
},
],
})
// or,
// await clone({ to, from })
})()wrote.erase(ws: Writable): Promise.<Writable>
Erase file and close stream.
const { createWritable, erase } = require('wrote')
const { Writable } = require('stream')
const path = require('path')
const HOME_DIR = require('os').homedir()
const file = path.join(HOME_DIR, `wrote-${Math.floor(Math.random() * 1e5)}.data`);
(async () => {
const ws = await createWritable(file)
console.log(ws instanceof Writable) // true
console.log(ws.writable) // true
console.log(ws.path) // ~/wrote-35558.data
await erase(ws)
console.log(ws.closed) // true
})()wrote.write(ws: Writable, data?: string|Readable): Promise.<Writable>
Pipe a Readable to the Writable stream and wait until it is finished, or end
Writable with given data (pass null to end stream without any more data).
const { write } = require('wrote')
const assert = require('assert')
const { Writable } = require('stream')
const testString = 'hello world'
const buffer = Buffer.from(testString)
const allRawData = []
const ws = new Writable({
write(chunk, encoding, next) {
allRawData.push(chunk)
next()
},
});
(async () => {
await write(ws, buffer)
console.log(allRawData.map(d => String(d))) // [ 'hello world' ]
assert.deepEqual(allRawData, [
buffer,
])
})()wrote.ensurePath(filePath: string): Promise<string>
Create all required directories for the filepath to exist. If a directory on the way is non-executable, the Promise will be rejected. Resolves with the filepath.
const { ensurePath } = require('wrote')
const { resolve } = require('path');
(async () => {
const path = 'path/to/temp/file.data'
const res = await ensurePath(path)
console.log(res) // path/to/temp/file.data, path/to/temp is created in your cwd
const absolutePath = resolve(process.cwd(), 'path/to/temp/file.data')
const res2 = await ensurePath(absolutePath)
console.log(res2) // $(pwd)/path/to/temp/file.data
})()wrote.read(path: string, { binary?: boolean }): Promise.<string>
Read a file fully. Returns a Promise resolved with the file contents, and
rejects if path is not a string or file not found (ENOENT).
const { read } = require('wrote');
(async () => {
const res = await read(__filename)
console.log(res)
})()examples/read.js: this program will print the contents of itself
Pass { binary: true } options to read as a Buffer:
const { read } = require('wrote');
(async () => {
const buffer = await read(__filename, { binary: true })
console.log(buffer) // // <Buffer 63 6f 6e 73 74 20 7b ... >
})()wrote.readJSON(path: string): Promise.<object>
Read a json file and parse its contents.
const { readJSON } = require('wrote');
(async () => {
const res = await read('path/to/file.json')
console.log(res)
})()wrote.writeJSON(path: string, object: object, { replacer?: function, space?: string|number }): Promise
Serialise an object with JSON.stringify and write it to a file. Pass space
and replacer in the options object.
const { writeJSON } = require('wrote');
(async () => {
const object = {
test: 'data',
date: new Date(),
}
await writeJSON('path/to/file.json', object, {
space: 2,
// replacer: () => {}
})
})()wrote.readDir(dirPath: string, recursive=: boolean): Promise<object>
Read a directory, and return contents of contained files.
For example, the following directory structure:
directory
- subdirectory
- subdirFileA.txt
` subdirFileB.txt
- fileA.txt
- fileB.txt
` fileC.txtcan be read either shallowly (by default):
const { readDir } = require('wrote')
const path = require('path')
const dirPath = path.join(__dirname, 'directory');
(async () => {
const res = await readDir(dirPath)
console.log(res)
// { 'fileA.txt': 'fileA\n',
// 'fileB.txt': 'fileB\n',
// 'fileC.txt': 'fileC\n' }
})()or recursively:
(async () => {
const res = await readDir(dirPath, true)
console.log(res)
// { 'fileA.txt': 'fileA\n',
// 'fileB.txt': 'fileB\n',
// 'fileC.txt': 'fileC\n',
// subdirectory:
// { 'subdirFileA.txt': 'subdirFileA\n',
// 'subdirFileB.txt': 'subdirFileB\n' } }
})()wrote.readDirStructure(dirPath: string): Promise<DirectoryStructure>
Get the full structure of the directory recursively. An array of either file names as strings, or an object representing all directories of the current one, with keys being their names, and values being arrays similar to the root one.
const path = require('path')
const { readDirStructure } = require('..')
const DIR_PATH = path.join(__dirname, '../test/fixtures/directory');
/**
* Read directory's structure.
*/
(async () => {
const res = await readDirStructure(DIR_PATH)
console.log(JSON.stringify(res, null, 2))
})(){
"type": "Directory",
"content": {
"subdirectory-ln": {
"type": "SymbolicLink"
},
"test-ln.data": {
"type": "SymbolicLink"
},
"test.data": {
"type": "File"
},
"subdirectory": {
"type": "Directory",
"content": {
"file.data": {
"type": "File"
},
"file2.data": {
"type": "File"
}
}
},
"subdirectory2": {
"type": "Directory",
"content": {
"file3.data": {
"type": "File"
},
"subsubdir": {
"type": "Directory",
"content": {
"file4.py": {
"type": "File"
}
}
},
"subsubdir2": {
"type": "Directory",
"content": {}
}
}
}
}
}todo
eraseDirto rm -rfcloneFileto clone a single filewritewith string as patherasewith string as pathclonewith permissions- pass options to
fs.createWriteStreaminwrote.createWritable
Licence: MIT
(c) Sobesednik-Media 2017