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/**
* Module dependencies.
*/
var debug = require('debug')('express:view');
var path = require('path');
var fs = require('fs');
var utils = require('./utils');
/**
* Module variables.
* @private
*/
var dirname = path.dirname;
var basename = path.basename;
var extname = path.extname;
var join = path.join;
var resolve = path.resolve;
/**
* 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 `name`
*
* @param {String} name
* @return {String}
* @api private
*/
View.prototype.lookup = function lookup(name) {
var path;
var roots = [].concat(this.root);
debug('lookup "%s"', name);
for (var i = 0; i < roots.length && !path; i++) {
var root = roots[i];
// resolve the path
var loc = resolve(root, name);
var dir = dirname(loc);
var file = basename(loc);
// resolve the file
path = this.resolve(dir, file);
}
return path;
};
/**
* Render with the given `options` and callback `fn(err, str)`.
*
* @param {Object} options
* @param {Function} fn
* @api private
*/
View.prototype.render = function render(options, fn) {
debug('render "%s"', this.path);
this.engine(this.path, options, fn);
};
/**
* Resolve the file within the given directory.
*
* @param {string} dir
* @param {string} file
* @private
*/
View.prototype.resolve = function resolve(dir, file) {
var ext = this.ext;
var path;
var stat;
// <path>.<ext>
path = join(dir, file);
stat = tryStat(path);
if (stat && stat.isFile()) {
return path;
}
// <path>/index.<ext>
path = join(dir, basename(file, ext), 'index' + ext);
stat = tryStat(path);
if (stat && stat.isFile()) {
return path;
}
};
/**
* Return a stat, maybe.
*
* @param {string} path
* @return {fs.Stats}
* @private
*/
function tryStat(path) {
debug('stat "%s"', path);
try {
return fs.statSync(path);
} catch (e) {
return undefined;
}
}
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