lilacs/util/file_hash_map.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.

var fs = require('fs');
var path = require('path');
var rd = require('rd');

var pathUtil = require('../util/path');

/**
 * get a file-hash map of all files under a directory
 *
 * @param dir Directory
 * @param ext Extension
 * @param hashLength Hash code length
 * @returns {{}}
 */
module.exports = (dir, ext, hashLength) => {
    // hash code length is default 8
    !hashLength && (hashLength = 8);

    var result = {};
    rd.eachFileFilterSync(dir, (file) => {

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

        var lastDotIndex = filePath.lastIndexOf('.');
        var extName = lastDotIndex < 0 ? '' : filePath.slice(lastDotIndex + 1);
        var fileName = lastDotIndex < 0 ? filePath : filePath.slice(0, lastDotIndex);

        if (!ext || ext == extName) {
            /**
             * index/index/index.12345678.js
             * ->
             * index/index/index: 12345678
             *
             *
             * @type {Map}
             */
            result[fileName.slice(0, fileName.length - hashLength - 1)] = fileName.slice(0 - hashLength);
        }
    });

    return result;
};