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var Q = require('q');
var fs = require('fs');
var path = require('path');
var glob = require('glob');
var stringify = require('json-to-html');
var Liquid = require('liquid-node');
var chokidar = require('chokidar');
/**
* Define any custom liquid filters here.
*/
var filters = {
/**
* Return a string formatted version of a JSON object.
* Useful for quick debugging of template data.
*/
prettify: function(obj) {
try {
return '<pre>' + stringify(obj) + '</pre>';
} catch (e) {
return 'Error prettifying';
}
},
/**
* Serialize Javascript objects into a JSON string
*/
stringify: function(obj) {
try {
return JSON.stringify(obj);
} catch (e) {
return 'Error stringifying';
}
},
};
/**
* Manages templates. Only supports Mustache currently/
*/
function OKTemplateRepo(options) {
options = options || {};
var self = this;
var root = this._root = options.root || 'templates';
// TODO Support more templates?
var ext = this._ext = 'liquid';
var cache = this._cache = {};
var engine = this._engine = new Liquid.Engine;
var debug = options.debug;
var globString = this._globString = root + '/*.' + ext
engine.registerFilters(filters);
engine.fileSystem = new Liquid.LocalFileSystem(root, ext);
this._populateCache(engine, cache, ext);
if (debug) {
var watcher = chokidar.watch(globString);
watcher.on('change', reloadTemplate);
watcher.on('add', reloadTemplate);
}
function reloadTemplate(path) {
self._loadTemplate(path);
}
}
OKTemplateRepo.prototype.getTemplate = function getTemplate(name) {
return this._cache[name];
}
OKTemplateRepo.prototype._loadTemplate = function loadTemplate(filePath) {
var engine = this._engine
var name = path.basename(filePath, '.' + this._ext);
var templateString = fs.readFileSync(filePath, {encoding: 'UTF8'});
if (!this._cache[name])
this._cache[name] = {};
var template = this._cache[name]
template.name = name;
template.templateString = templateString;
template.render = render
function render(data) {
return Q.promise(function(resolve, reject) {
// TODO Not sure if this caches parsed templates behind the scenes?
engine.parseAndRender(templateString, data)
.then(resolve)
.catch(reject);
});
}
}
/**
* Go through our template dir and read the template files
* into memory as strings.
* Assumes all templates fit into memory.
*/
OKTemplateRepo.prototype._populateCache = function _populateCache(engine, cache, ext) {
var self = this;
var files = glob.sync(this._globString);
files.forEach(function eachFile(path) {
self._loadTemplate(path);
});
}
module.exports = OKTemplateRepo;
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