Custom excerpt.js

excerpt.js

// # Excerpt Helper
// Usage: `{{excerpt}}`, `{{excerpt words="50"}}`, `{{excerpt characters="256"}}`
//
// Attempts to remove all HTML from the string, and then shortens the result according to the provided option.
//
// Defaults to words="50"

/*

  Added optional ability to use 2 <!--excerpt--> tags in your posts to specify exactly what will be
  shown as your excerpt.  It will add an elipsis where the second tag is.
  
  e.g. Sample Post:
  
  
    # Post Header
  
    Here is some content that I don't want in my excerpt.  <!--excerpt-->But this is what
    I want to show up in my excerpt on my main blog page<!--excerpt-->.  This won't show
    up either.  Handy!
  
  
  NOTE: If there are no <!--excerpt--> tags, it will default to your preferred default of words & characters.

  By: Marlon Wiebe (mwiebe.com)
  Adapted from: thomas_na & Lerg (https://ghost.org/forum/using-ghost/15991-customize-post-preview/)
*/

var hbs             = require('express-hbs'),
    _               = require('lodash'),
    downsize        = require('downsize'),
    excerpt;

excerpt = function (options) {
    var truncateOptions = (options || {}).hash || {},
        excerpt;

    truncateOptions = _.pick(truncateOptions, ['words', 'characters']);
    _.keys(truncateOptions).map(function (key) {
        truncateOptions[key] = parseInt(truncateOptions[key], 10);
    });

	if (this.html.indexOf("<!--excerpt-->") > -1) {
        var split = this.html.split('<!--excerpt-->', 2);
        var output = split[1];
        return new hbs.handlebars.SafeString(output);
    } else {

    		/*jslint regexp:true */
    		excerpt = String(this.html);
    		// Strip inline and bottom footnotes
    		excerpt = excerpt.replace(/<a href="#fn.*?rel="footnote">.*?<\/a>/gi, '');
    		excerpt = excerpt.replace(/<div class="footnotes"><ol>.*?<\/ol><\/div>/, '');
    		// Strip other html
    		excerpt = excerpt.replace(/<\/?[^>]+>/gi, '');
    		excerpt = excerpt.replace(/(\r\n|\n|\r)+/gm, ' ');
    		/*jslint regexp:false */

    		if (!truncateOptions.words && !truncateOptions.characters) {
     		   truncateOptions.words = 50;
    		}

    		return new hbs.handlebars.SafeString(
        		downsize(excerpt, truncateOptions)
    		);
	}
};

module.exports = excerpt;