view.js
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/**
* Module dependencies.
*/
var path = require('path');
var fs = require('fs');
var utils = require('./utils');
var dirname = path.dirname;
var basename = path.basename;
var extname = path.extname;
var exists = fs.existsSync || path.existsSync;
var join = path.join;
/**
* Expose `View`.
*/
module.exports = View;
/**
* Initialize a new `View` with the given `name`.
*
* Options:
*
* - `defaultEngine` the default template engine name
* - `engines` template engine require() cache
* - `root` root path for view lookup
*
* @param {String} name
* @param {Object} options
* @api private
*/
function View(name, options) {
options = options || {};
this.name = name;
this.root = options.root;
var engines = options.engines;
this.defaultEngine = options.defaultEngine;
var ext = this.ext = extname(name);
if (!ext && !this.defaultEngine) throw new Error('No default engine was specified and no extension was provided.');
if (!ext) name += (ext = this.ext = ('.' != this.defaultEngine[0] ? '.' : '') + this.defaultEngine);
this.engine = engines[ext] || (engines[ext] = require(ext.slice(1)).__express);
this.path = this.lookup(name);
}
/**
* Lookup view by the given `path`
*
* @param {String} path
* @return {String}
* @api private
*/
View.prototype.lookup = function(path){
var ext = this.ext;
// <path>.<engine>
if (!utils.isAbsolute(path)) path = join(this.root, path);
if (exists(path)) return path;
// <path>/index.<engine>
path = join(dirname(path), basename(path, ext), 'index' + ext);
if (exists(path)) return path;
};
/**
* Render with the given `options` and callback `fn(err, str)`.
*
* @param {Object} options
* @param {Function} fn
* @api private
*/
View.prototype.render = function(options, fn){
this.engine(this.path, options, fn);
};