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const path = require('path');
const async = require('async');
const fs = require('fs-extra');
const Git = require('./git.js');
/**
* Generate a list of unique directory paths given a list of file paths.
* @param {Array<string>} files List of file paths.
* @return {Array<string>} List of directory paths.
*/
function uniqueDirs(files) {
const dirs = new Set();
files.forEach((filepath) => {
const parts = path.dirname(filepath).split(path.sep);
let partial = parts[0] || '/';
dirs.add(partial);
for (let i = 1, ii = parts.length; i < ii; ++i) {
partial = path.join(partial, parts[i]);
dirs.add(partial);
}
});
return Array.from(dirs);
}
/**
* Sort function for paths. Sorter paths come first. Paths of equal length are
* sorted alphanumerically in path segment order.
* @param {string} a First path.
* @param {string} b Second path.
* @return {number} Comparison.
*/
function byShortPath(a, b) {
const aParts = a.split(path.sep);
const bParts = b.split(path.sep);
const aLength = aParts.length;
const bLength = bParts.length;
let cmp = 0;
if (aLength < bLength) {
cmp = -1;
} else if (aLength > bLength) {
cmp = 1;
} else {
let aPart, bPart;
for (let i = 0; i < aLength; ++i) {
aPart = aParts[i];
bPart = bParts[i];
if (aPart < bPart) {
cmp = -1;
break;
} else if (aPart > bPart) {
cmp = 1;
break;
}
}
}
return cmp;
}
exports.byShortPath = byShortPath;
/**
* Generate a list of directories to create given a list of file paths.
* @param {Array<string>} files List of file paths.
* @return {Array<string>} List of directory paths ordered by path length.
*/
function dirsToCreate(files) {
return uniqueDirs(files).sort(byShortPath);
}
exports.copy = function (files, base, dest) {
return new Promise((resolve, reject) => {
const pairs = [];
const destFiles = [];
files.forEach((file) => {
const src = path.resolve(base, file);
const relative = path.relative(base, src);
const target = path.join(dest, relative);
pairs.push({
src: src,
dest: target,
});
destFiles.push(target);
});
async.eachSeries(dirsToCreate(destFiles), makeDir, (err) => {
if (err) {
return reject(err);
}
async.each(pairs, copyFile, (err) => {
if (err) {
return reject(err);
} else {
return resolve();
}
});
});
});
};
exports.copyFile = copyFile;
exports.dirsToCreate = dirsToCreate;
/**
* Copy a file.
* @param {Object} obj Object with src and dest properties.
* @param {function(Error):void} callback Callback
*/
function copyFile(obj, callback) {
let called = false;
function done(err) {
if (!called) {
called = true;
callback(err);
}
}
const read = fs.createReadStream(obj.src);
read.on('error', (err) => {
done(err);
});
const write = fs.createWriteStream(obj.dest);
write.on('error', (err) => {
done(err);
});
write.on('close', () => {
done();
});
read.pipe(write);
}
/**
* Make directory, ignoring errors if directory already exists.
* @param {string} path Directory path.
* @param {function(Error):void} callback Callback.
*/
function makeDir(path, callback) {
fs.mkdir(path, (err) => {
if (err) {
// check if directory exists
fs.stat(path, (err2, stat) => {
if (err2 || !stat.isDirectory()) {
callback(err);
} else {
callback();
}
});
} else {
callback();
}
});
}
/**
* Copy a list of files.
* @param {Array<string>} files Files to copy.
* @param {string} base Base directory.
* @param {string} dest Destination directory.
* @return {Promise} A promise.
*/
exports.getUser = function (cwd) {
return Promise.all([
new Git(cwd).exec('config', 'user.name'),
new Git(cwd).exec('config', 'user.email'),
])
.then((results) => {
return {name: results[0].output.trim(), email: results[1].output.trim()};
})
.catch((err) => {
// git config exits with 1 if name or email is not set
return null;
});
};
exports.uniqueDirs = uniqueDirs;
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