Add option to add target="_blank" when parsing links

[SekibOmazic]

Would be nice to have an option that adds target="_blank" on parsed links.

[tivie]

Hey @SekibOmazic.

This "option" makes more sense as an extension rather than something embeded on core.

[rabeesh]

It will be nice to support feature to convert

[adjustable](http://google.com "Giiidd"){:target="_blank"}

[tivie]

Adding extra syntax to the link element is not a good idea as it diverts from the markdown spec and breaks compatibility.

However, there are 2 easy ways to add this to links:

Using embeded html

fiddle

some text with a link <a href="http://www.google.com" target="blank">google</a>

Create an extension

fiddle

showdown.extension('targetlink', function() {
  return [{
    type: 'lang',
    regex: /\[((?:\[[^\]]*]|[^\[\]])*)]\([ \t]*<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\4[ \t]*)?\)\{\:target=(["'])(.*)\6}/g,
    replace: function(wholematch, linkText, url, a, b, title, c, target) {

      var result = '<a href="' + url + '"';

      if (typeof title != 'undefined' && title !== '' && title !== null) {
        title = title.replace(/"/g, '&quot;');
        title = showdown.helper.escapeCharacters(title, '*_', false);
        result += ' title="' + title + '"';
      }

      if (typeof target != 'undefined' && target !== '' && target !== null) {
        result += ' target="' + target + '"';
      }

      result += '>' + linkText + '</a>';
      return result;
    }
  }];
});