lilacs/gulp/handle/find_changed_files.js

A web frontend building tool for teamwork, with automaticly compiling, merging, minifying, syncing files to server, supporting distributed servers, ensuring css or html files' inline reference with correct absolute path, and more.

"use strict";

var md5 = require('crypto-md5');
var path = require('path');
var rd = require('rd');
var fs = require('fs');
var _ = require('lodash');

var manifests = require('../../data/manifests');
var vars = require('../../data/vars');
var isManifest = require('../../util/is_manifest');

/**
 * find changed files
 *
 * @param dir Directory to handle
 * @param name Type name (base, js, css, ...)
 * @returns {{}}
 */
module.exports = (dir, name) => {

    // manifest file
    var manifestFile = manifests[name || 'base'];

    // manifests directory
    var manifestsDirectory = vars.projectRoot + '/manifests';

    // manifest file path
    var manifestPath = path.resolve(manifestsDirectory + '/' + manifestFile);

    // new manifest
    var newManifest = {};
    // old manifest
    var originManifest = {};
    // changed files
    var changedFiles = {};

    // if manifests directory is not exist, create it
    if (!fs.existsSync(manifestsDirectory)) fs.mkdirSync(manifestsDirectory);

    // is manifest file exist, load it.
    if (fs.existsSync(manifestPath)) originManifest = require(manifestPath);

    // read all files under dir
    rd.eachFileFilterSync(dir, (file) => {

        var filePath = path.relative(dir, file);

        if (!isManifest(filePath)) {
            var fileContent = fs.readFileSync(file);
            // record in newManifest
            fileContent && (newManifest[filePath] = md5(fileContent, 'hex'));
        }
    });

    // find out all changed files
    _.forEach(newManifest, (value, key) => {
        if (originManifest[key] !== value) {
            changedFiles[key] = value;
        }
    });

    // merge originManifest to newManifest
    _.forEach(originManifest, (value, key) => {
        if (!newManifest[key]) {
            newManifest[key] = value;
        }
    });

    // save new content to manifest file
    fs.writeFileSync(manifestPath, JSON.stringify(newManifest));

    return changedFiles;
};