hash.js

/**
 *
 * @date 2015-03-30 00:12:45
 * @author vfasky <vfasky@gmail.com>
 */

"use strict";

var through2 = require('through2');
var FS = require("q-io/fs");
var path = require('path');
var crypto = require('crypto');
var del = require('del');

var md5 = function(text) {
    return crypto.createHash('md5').update(String(text)).digest('hex');
};

var getHash = function(text) {
    return md5(text).substring(0, 6);
};

var fileMapPath = path.join(__dirname, 'filemap.json');

var buildHash = function() {
    return through2.obj(function(file, enc, callback) {
        //var newPath = file.path.replace('all.js', 'all.min.js');
        var paths = file.path.split(path.sep);
        var packName = paths.pop().split('.all.')[0];

        if (paths.pop() === 'tpl') {
            packName = 'tpl/' + packName.replace('.js', '');
        }

        //file.path = newPath;
        var hash = getHash(file.contents);
        var delPath;
        FS.exists(fileMapPath).then(function(stat) {
                if (stat) {
                    return FS.read(fileMapPath);
                }
                return '{}';
            })
            .then(function(json) {
                var data = JSON.parse(json);
                var paths = file.path.split(path.sep);
                var soureName = paths.pop();
                var name = soureName.replace('.js', '.' + hash + '.js');
                var match = soureName.replace('.js', '.*.js');
                paths.push(name);
                file.path = paths.join(path.sep);

                paths[paths.length - 1] = match;
                delPath = paths.join(path.sep);

                var devPath = false;
                if(name.indexOf('.min.') !== -1){
                    paths[paths.length - 1] = soureName.replace('.min.js', '.js');
                    devPath = paths.join(path.sep);
                }

                data[packName] = {
                    hash: hash,
                    path: file.path,
                    devPath: devPath
                };

                return FS.write(fileMapPath, JSON.stringify(data, null, 4));
            })
            .then(function() {

                del([delPath, '!'+file.path], {force: true}, function(){
                    callback(null, file);
                });
            })
            .fail(function(err) {
                callback(err);
            });

    });
};

buildHash.setPath = function(filePath) {
    fileMapPath = path.join(filePath, 'filemap.json');
};

buildHash.getPath = function(){
    return fileMapPath;
};

module.exports = buildHash;