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utils.js
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247 lines (197 loc) · 6.31 KB
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'use strict';
// Imports
const childProcess = require('child_process');
const fs = require('fs');
const path = require('path');
// Variables - Private
const exec = childProcess.exec;
const spawn = childProcess.spawn;
// Exports
module.exports = {
copyContent,
createDir,
execAsPromised,
finallyAsPromised,
getExecutable,
keepOnly,
killProcess,
removeDir,
removeFile,
replaceInFile,
spawnAsPromised,
traverseDir
};
// Functions - Definitions
function copyContent(srcDir, dstDir, notIgnoreHidden) {
return traverseDir(srcDir, fileCallback, {pre: dirCallback});
// Helpers
function dirCallback(dirPath) {
return (!notIgnoreHidden && isHidden(dirPath)) ?
Promise.resolve(true) :
createDir(dirPath.replace(srcDir, dstDir));
}
function fileCallback(filePath) {
return (!notIgnoreHidden && isHidden(filePath)) ?
Promise.resolve() :
new Promise((resolve, reject) => {
const dstPath = filePath.replace(srcDir, dstDir);
fs.readFile(filePath, (err, data) => {
if (err) return reject(err);
fs.writeFile(dstPath, data, err => err ? reject(err) : resolve());
});
});
}
}
function createDir(dir, failIfExists) {
return new Promise((resolve, reject) => {
fs.mkdir(dir, err => {
if (err && (failIfExists || (err.code !== 'EEXIST'))) reject(err);
resolve();
});
});
}
function execAsPromised(cmd, options) {
let proc;
const promise = new Promise((resolve, reject) => {
proc = exec(cmd, options, (err, stdout) => {
if (err) return reject(err);
resolve(stdout);
});
});
promise.$$process = proc;
return promise;
}
function finallyAsPromised(promise, callback) {
return promise.then(runCallback('resolve'), runCallback('reject'));
// Helpers
function runCallback(returnMethod) {
return arg => {
const onDone = () => Promise[returnMethod](arg);
return Promise.resolve(callback()).then(onDone, onDone);
};
}
}
function getExecutable(name, isGlobal) {
const suffix = isWindows() ? '.cmd' : '';
const prefix = isGlobal ? '' : path.join('node_modules', '.bin');
return `${path.join(prefix, name)}${suffix}`;
}
function ignoreMissing(err) {
if (err.code === 'ENOENT') {
console.warn(`Ignoring error: ${err}\n ${err.stack || ''}`);
return Promise.resolve();
}
return Promise.reject(err);
}
function isHidden(fileOrDir) {
return path.basename(fileOrDir)[0] === '.';
}
function isWindows() {
return process.platform === 'win32';
}
function keepOnly(fileOrDir, notIgnoreHidden) {
return new Promise((resolve, reject) => {
const absPath = path.resolve(fileOrDir);
const parentDir = path.dirname(absPath);
fs.readdir(parentDir, (err, items) => {
if (err) return reject(err);
let itemsToRemove = items.filter(item => path.resolve(item) !== absPath);
if (!notIgnoreHidden) itemsToRemove = itemsToRemove.filter(item => !isHidden(item));
Promise.
all(itemsToRemove.map(item => new Promise((resolve, reject) => {
fs.lstat(item, (err, stat) => {
if (err) return ignoreMissing(err).then(resolve, reject);
const promise = stat.isDirectory() ? removeDir(item) : removeFile(item);
promise.catch(ignoreMissing).then(resolve, reject);
});
}))).
then(resolve, reject);
});
});
}
function killProcess(proc) {
const pid = proc.pid;
const cmd = (isWindows() ? 'taskkill /t /f /pid ' : 'kill ') + pid;
return spawnAsPromised(cmd);
}
function replaceInFile(valuePlaceholderMap, filePath) {
return new Promise((resolve, reject) => {
fs.readFile(filePath, 'utf-8', (err, text) => {
if (err) return reject(err);
const newText = Object.
keys(valuePlaceholderMap).
reduce((text, value) => text.replace(valuePlaceholderMap[value], value), text);
fs.writeFile(filePath, newText, err => err ? reject(err) : resolve());
});
});
}
function removeDir(dir) {
return traverseDir(dir, removeFile, removeEmptyDir, ignoreMissing).
catch(ignoreMissing);
// Helpers
function removeEmptyDir(emptyDir) {
return new Promise((resolve, reject) => {
fs.rmdir(emptyDir, err => err ? reject(err) : resolve());
});
}
}
function removeFile(file) {
return new Promise((resolve, reject) => {
fs.unlink(file, err => err ? reject(err) : resolve());
});
}
function spawnAsPromised(cmd, options) {
let proc;
const promise = new Promise((resolve, reject) => {
const parsedCmd = parseCmd(cmd);
const executable = parsedCmd.executable;
const args = parsedCmd.args;
options = options || {stdio: 'inherit'};
proc = spawn(executable, args, options).
on('error', reject).
on('exit', (code, signal) => (code !== 0) ? reject(code || signal) : resolve());
});
promise.$$process = proc;
return promise;
// Helpers
function parseCmd(cmd) {
const tokens = Array.isArray(cmd) ? cmd : cmd.
split('"').
reduce((arr, str, idx) => arr.concat((idx % 2) ? `"${str}"` : str.split(' ')), []).
filter(Boolean);
return {
executable: tokens[0],
args: tokens.slice(1)
};
}
}
function traverseDir(dir, fileCallback, dirCallback, errInterceptor) {
const resolve = () => Promise.resolve();
const reject = err => Promise.reject(err);
if (!errInterceptor) errInterceptor = reject;
dirCallback = {
pre: dirCallback.pre || resolve,
post: (typeof dirCallback === 'function') ? dirCallback : (dirCallback.post || resolve)
};
return dirCallback.pre(dir).
then(skip => skip ? Promise.resolve() : new Promise((resolve, reject) => {
fs.readdir(dir, (err, items) => {
if (err) return errInterceptor(err).then(resolve, reject);
Promise.
all(items.map(item => new Promise((resolve, reject) => {
const curPath = path.join(dir, item);
fs.lstat(curPath, (err, stat) => {
if (err) return errInterceptor(err).then(resolve, reject);
const promise = stat.isDirectory() ?
traverseDir(curPath, fileCallback, dirCallback, errInterceptor) :
fileCallback(curPath);
promise.
catch(errInterceptor).
then(resolve, reject);
});
}))).
then(resolve, reject);
});
})).
then(() => dirCallback.post(dir));
}