gulp-bower-files/lib/package_collection.js

Build gulp.src() of your bower packages main files.

var path    = require("path");
var fs      = require("fs");
var Package = require("./package");
var logger  = require("./logger");

/**
 * Collection for bower packages
 *
 * @class PackageCollection
 */

/**
 * @constructor
 * @param {Object} opts 
 */
var PackageCollection = function(opts) {
    this.opts               = opts;
    this.opts.main          = opts.main || null;
    this.opts.env           = opts.env || process.env.NODE_ENV;
    this.debugging          = opts.debugging || false;
    this.overrides          = {};
    this._queue             = [];
    this._lastQueueLength   = 0;
    this._packages          = {};
    this._processed         = {};
}

PackageCollection.prototype = {
    /**
     * Adds a package to the collection
     *
     * @param {String} name Name of the package
     * @param {String} path Path to the package files
     */
    add: function(name, path) {
        if(typeof this._packages[name] !== "undefined")
            return;

        if(this.debugging) {
            logger("PackageCollection", "add\t\t", name, path);
        }

        this._packages[name] = true;

        var opts = this.overrides[name] || {}
        opts.name = name;
        opts.path = path;

        this._packages[name] = new Package(opts, this);
    },

    /**
     * Collects all packages
     */
    collectPackages: function() {
        if(!fs.existsSync(this.opts.paths.bowerJson))
            throw new Error("bower.json does not exist at: " + this.opts.paths.bowerJson);

        var bowerJson = JSON.parse(fs.readFileSync(this.opts.paths.bowerJson, "utf8"));
        var dependencies = bowerJson.dependencies || {};

        this.overrides = bowerJson.overrides || {};

        if(this.opts.includeDev === true && bowerJson.devDependencies) {
            for(var name in bowerJson.devDependencies) {
                dependencies[name] = bowerJson.devDependencies[name];
            }
        }

        for(var name in dependencies) {
            this.add(name, path.join(this.opts.paths.bowerDirectory, "/", name));
        }
    },

    /**
     * Get srcs of all packages
     *
     * @return {Array}
     */
    getFiles: function() {
        for(var name in this._packages) {
            this._queue.push(this._packages[name]);
        }

        return this.process();
    },

    /**
     * processes the queue and returns the srcs of all packages
     *
     * @private
     * @return {Array}
     */
    process: function() {
        var queue = this._queue;
        var srcs = [];
        var force = false;

        if(this._lastQueueLength === queue.length) {
            force = true;
        }

        this._lastQueueLength = queue.length;

        this._queue = [];

        queue.forEach(function(package) {
            var packageSrcs = package.getFiles(force);

            if(packageSrcs === false) {
                return this._queue.push(package);
            }

            srcs.push.apply(srcs, packageSrcs);
            this._processed[package.name] = true;
        }.bind(this));

        if(this._queue.length) {
            srcs.push.apply(srcs, this.process());
        }

        return srcs;
    }
};

module.exports = PackageCollection;