enigma-bbs/core/theme.js

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/* jslint node: true */
'use strict';
var Config = require('./config.js').config;
var art = require('./art.js');
var miscUtil = require('./misc_util.js');
var Log = require('./logger.js').log;
var fs = require('fs');
var paths = require('path');
var async = require('async');
var _ = require('lodash');
var assert = require('assert');
var stripJsonComments = require('strip-json-comments');
exports.loadTheme = loadTheme;
exports.getThemeArt = getThemeArt;
exports.getRandomTheme = getRandomTheme;
exports.initAvailableThemes = initAvailableThemes;
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exports.displayThemeArt = displayThemeArt;
function loadTheme(themeID, cb) {
var path = paths.join(Config.paths.themes, themeID, 'theme.json');
fs.readFile(path, { encoding : 'utf8' }, function onData(err, data) {
if(err) {
cb(err);
} else {
try {
var theme = JSON.parse(stripJsonComments(data));
if(!_.isObject(theme.info)) {
cb(new Error('Invalid theme JSON'));
return;
}
assert(!_.isObject(theme.helpers)); // we create this on the fly!
//
// Create some handy helpers
//
theme.helpers = {
getPasswordChar : function() {
var pwChar = Config.defaults.passwordChar;
if(_.has(theme, 'customization.defaults.general')) {
var themePasswordChar = theme.customization.defaults.general.passwordChar;
if(_.isString(themePasswordChar)) {
pwChar = themePasswordChar.substr(0, 1);
} else if(_.isNumber(themePasswordChar)) {
pwChar = String.fromCharCode(themePasswordChar);
}
}
return pwChar;
}
}
cb(null, theme);
} catch(e) {
cb(err);
}
}
});
}
var availableThemes = {};
function initAvailableThemes(cb) {
async.waterfall(
[
function getDir(callback) {
fs.readdir(Config.paths.themes, function onReadDir(err, files) {
callback(err, files);
});
},
function filterFiles(files, callback) {
var filtered = files.filter(function onFilter(file) {
return fs.statSync(paths.join(Config.paths.themes, file)).isDirectory();
});
callback(null, filtered);
},
function populateAvailable(filtered, callback) {
filtered.forEach(function onTheme(themeId) {
loadTheme(themeId, function themeLoaded(err, theme) {
if(!err) {
availableThemes[themeId] = theme;
Log.debug( { info : theme.info }, 'Theme loaded');
}
});
});
callback(null);
}
],
function onComplete(err) {
if(err) {
cb(err);
return;
}
cb(null, availableThemes.length);
}
);
}
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function getRandomTheme() {
if(Object.getOwnPropertyNames(availableThemes).length > 0) {
var themeIds = Object.keys(availableThemes);
return themeIds[Math.floor(Math.random() * themeIds.length)];
}
}
function getThemeArt(name, themeID, options, cb) {
// allow options to be optional
if(_.isUndefined(cb)) {
cb = options;
options = {};
}
// set/override some options
// :TODO: replace asAnsi stuff with something like retrieveAs = 'ansi' | 'pipe' | ...
// :TODO: Some of these options should only be set if not provided!
options.asAnsi = true;
options.readSauce = true; // encoding/fonts/etc.
options.random = miscUtil.valueWithDefault(options.random, true);
options.basePath = paths.join(Config.paths.themes, themeID);
art.getArt(name, options, function onThemeArt(err, artInfo) {
if(err) {
// try fallback of art directory
options.basePath = Config.paths.art;
art.getArt(name, options, function onFallbackArt(err, artInfo) {
if(err) {
cb(err);
} else {
cb(null, artInfo);
}
});
} else {
cb(null, artInfo);
}
});
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}
function displayThemeArt(options, cb) {
assert(_.isObject(options));
assert(_.isObject(options.client));
assert(_.isString(options.name));
getThemeArt(options.name, options.client.user.properties.theme_id, function themeArt(err, artInfo) {
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if(err) {
cb(err);
} else {
var dispOptions = {
art : artInfo.data,
sauce : artInfo.sauce,
client : options.client,
font : options.font,
};
art.display(dispOptions, function displayed(err, mciMap) {
cb(err, mciMap, artInfo);
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});
}
});
}