command.js

(function() {
  var silent = false;
  
  var url = location.href;
  var title = document.title;

  if(document.querySelector) {
    if(1 === document.getElementsByClassName('hentry').length) {
      title = document.querySelector(
          '.hentry .entry-title, .hentry h1, .hentry h2, .hentry h3'
        ).innerText;
    }
  }

  if('' !== (text = String(document.getSelection()))) {
    text = ['<blockquote>', text, '</blockquote>', "\n\n"].join('');
  }
  

  if(document.querySelectorAll) {
    var tags = [].slice.call(
      document.querySelectorAll('a[rel~=tag]'),0).map(
        function(a) { 
          return a.href.split('/').pop(); 
        }
      ).join(' ');
  }
  

  var args = [
    'http://pinboard.in/add?url=', encodeURIComponent(url),
    '&description=', encodeURIComponent(text),
    '&tags', encodeURIComponent(tags),
    '&title=', encodeURIComponent(title)
  ];
  

  if(silent) {
    args = args.concat([
      '&later=', 'yes',
      '&jump=', 'close'
    ]);
  }
 
  var pin = open(args.join(''), 'Pinboard', 'toolbar=no,width=610,height=350');
  

  if(silent) {
    pin.blur();
  }
  
})();

command.json

{
  "name": "Add to Pinboard",
  "description": "Add a link to Pinboard.in",
  "icon": 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  "link": "http://pinboard.in"
}