First draft of unusedstrings.py in JS

unusedstrings.js

"use strict";

let fs = require('fs'),
    _ = require('underscore');

function match_stuff(regexp, data, cb) {
    let match;
    while ((match = regexp.exec(data)) !== null) {
        cb(match[1]);
    }
}


function getCodeStrings(filePath) {
    let strings = []
    var files = fs.readdirSync(__dirname + filePath);
    files.forEach(function(file) {
        var data = fs.readFileSync(__dirname + filePath + file);
        var add_to_string = function(match) {
            if (strings.indexOf(match) == -1) {
                strings.push(match);
            }
        };
        match_stuff(/__\("([^"]+)/g, data, add_to_string);
        match_stuff(/__\('([^']+)/g, data, add_to_string);
    });
    return strings;
}

function getVideoStrings(filePath) {
    var strings = [];
    var videosJSON = require(__dirname + filePath);
    for (let section_id in videosJSON) {
        let section = videosJSON[section_id];
        strings.push(section.title);
        for (let video_id in section.videos) {
            let video = section.videos[video_id];
            strings.push(video.title);
            if (video.description) {
                strings.push(video.description);
            }
            if ('assertions' in video) {
                for (let assertion_id in video.assertions) {
                    let assertion = video.assertions[assertion_id];
                    strings.push(assertion.title);
                    Array.prototype.push.apply(strings, assertion.hints);
                }
            }
        }
    }

    return strings;
}

function getLocaleKeys(filePath) {
    var strings = []
    var localeFile = fs.readFileSync(__dirname + filePath);
    let localeJSON = JSON.parse(localeFile);
    for(let key in localeJSON) {
        strings.push(key);
    }

    return strings;
}

let codeStrings = getCodeStrings('/../views/');
let videoStrings = getVideoStrings('/../data/videos.json');

let liveStrings = _.union(codeStrings, videoStrings);