index.js

'use strict';

var through = require('through2');
var gutil = require('gulp-util');
var little = require('little-template');
var fs = require('fs');
var path = require('path');

/**
 * Render a string of HTML using Little Template
 *
 * @param {Object|Function}  settings    Plugin settings, or a function to use
 *                                       to render templates. If an object is
 *                                       given, the value for 'render' must be
 *                                       a function to handle rendering
 *                                       templates.
 * @api public
 */
module.exports = function (settings) {
  settings = (typeof settings == 'function') ? {render: settings} : settings;
  settings.ext = typeof settings.ext === 'undefined' ? '.html' : settings.ext;

  // Store the contents of each file, so we don't have to read it more than once
  var cache = {};

  return through.obj(function (file, enc, cb) {
    if (file.isNull()) {
      this.push(file);
      return cb();
    }

    if (file.isStream()) {
      this.emit(
        'error',
        new gutil.PluginError('gulp-little-template', 'Streaming not supported')
      );
    }

    try {
      file.contents = new Buffer(little(file.contents.toString(),
                                        function (templateName, context) {
        var filePath = (settings.path) ?
                      path.join(settings.path, templateName) :
                      templateName;
        var templateFile;

        if (cache.hasOwnProperty(filePath)) {
          templateFile = cache[filePath];
        } else {
          templateFile = fs.readFileSync(filePath, 'utf-8');
          cache[filePath] = templateFile;
        }

        return settings.render(templateFile, context, templateName);
      }));
      file.path = gutil.replaceExtension(file.path, settings.ext);
    } catch (err) {
      this.emit('error',
                new gutil.PluginError('gulp-little-template', err.toString()));
    }

    this.push(file);
    cb();
  });
};