retweetcommand.user.js

// ==UserScript==
// @name           ReTweetCommand
// @namespace      http://d.hatena.ne.jp/Constellation/
// @description    ReTweet Command for LDRize
// @include        http://twitter.com/*
// @include        https://twitter.com/*
// ==/UserScript==

function boot(ev){
  if(ev) window.removeEventListener('GM_MinibufferLoaded', boot, false);
  var win = unsafeWindow;
  var Minibuffer = window.Minibuffer;
  var $X = Minibuffer.$X;
  var D  = Minibuffer.D;
  var DC = D();

  function $A(arr){
    return Array.slice.call(arr);
  }

  function parseText(text, url){
    // RT Template
    // RT @username: tweet
    var dom = HTMLStringToDOM(text);
    var account = url.match('http://twitter\\.com/([^/]+)')[1];
    var res = $X('descendant::span[contains(concat(" ",normalize-space(@class)," ")," entry-content ")]', dom).map(function(node){ return node.textContent }).join("");
    return "RT @" + account + ": " + res;
  }

  // inspired from Mochikit.DOM.formContents
  // MIT License
  // はじめはTreeWalkerをつかってやろうと意気込みましたが,
  // GMContextで使えずlocation='javascript:~をする必要があるのか,
  // DOMからつくったのがわるいのかだめだったので, 安易なwalkerに変更
  function walker(element, func){
    (function loop(elm){
      var res = func(elm);
      if(res){
        $A(res).forEach(function(node){
          loop(node);
        });
      }
    })(element);
  }
  function formContents(form){
    var hash = {};
    walker(form, function(node){
      try{
        var name = node.getAttribute('name');
      } catch(e){
        return node.childNodes;
      }
      if(name){
        var tag = node.tagName.toLowerCase();
        if(tag === 'input' && (node.type === 'radio' || node.type === 'checkbox') && !node.checked){
          return null;
        } else if(tag === 'form' || tag === 'p' || tag === "span" || tag === 'div'){
          return node.childNodes;
        } else if(tag === 'select'){
          if(node.type === 'select-one'){
            if(node.selectedIndex >= 0){
              hash[name] = node.options[node.selectedIndex].value;
              return null;
            } else {
              hash[name] = '';
              return null;
            }
          } else {
            var opts = $A(node.options);
            if(!opts.length){
              hash[name] = "";
              return null;
            } else {
              opts.forEach(function(opt, index){
                if(opt.selected){
                  hash[name] = opt.value;
                }
              });
              return null;
            }
          }
        }
        hash[name] = node.value || '';
        return node.childNodes;
      } else {
        return node.childNodes;
      }
    });
    return hash;
  }

  function hashToData(hash){
    var list = [];
    for(key in hash) list.push(encodeURIComponent(key)+'='+encodeURIComponent(hash[key]));
    return list.join('&');
  }

  function twit(stat){
    var action = 'http://twitter.com/status/update';
    var page = 'http://twitter.com/home';
    with(DC){
      return xhttp.get(page).next(function(res){
        var text = res.responseText;
        var dom = HTMLStringToDOM(text);
        var form = $X('id("status_update_form")', dom)[0].wrappedJSObject;
        var hash = formContents(form);
        hash['status'] = stat;
        var data = hashToData(hash);
        return xhttp.post(action, data);
      });
    }
  }

  // from http://gist.github.com/164430
  // thanks id:snaka and id:os0x
  function HTMLStringToDOM(str){
    var html = String(str).replace(/<script(?:[ \t\r\n][^>]*)?>[\S\s]*?<\/script[ \t\r\n]*>|<\/?(?:i?frame|html|script|object)(?:[ \t\r\n][^<>]*)?>/gi, ' ');
    var htmlDoc = document.implementation.createHTMLDocument ?
    document.implementation.createHTMLDocument('HTMLParser') :
    document.implementation.createDocument(null, 'html', null);
    var range = document.createRange();
    range.selectNodeContents(document.documentElement);
    htmlDoc.documentElement.appendChild(htmlDoc.importNode(range.createContextualFragment(html),true));
    return htmlDoc;
  }
  var count = 0;
  Minibuffer.addCommand({
    name    : 'Twitter::ReTweet',
    command : function(stdin){
      if(stdin.length){
        var id = "retweet" + count++;
        Minibuffer.status(id, 'ReTweet...');
        // locationとpinned-or-current-linkの違いを吸収
        var data = (typeof stdin[0] === 'string')? stdin : stdin.map(function(node){ return node.href });
        data = data.filter(function(url){
          return /\/\/twitter\.com\/.*?\/(status|statuses)\/\d+/.test(url);
        })
        with(DC){
          parallel(data.map(function(url){
            return xhttp.get(url).next(function(res){
              var text = parseText(res.responseText, url);
              return twit(text).next(function(){
              });
            });
          })).next(function(){
            Minibuffer.status(id, 'Done', 100);
          });
        }
      }
      return stdin;
    }
  });

  Minibuffer.addShortcutkey({
    key : 't',
    description : 'ReTweet',
    command : function(){
      try {
        var stdin = Minibuffer.execute((/\/\/twitter\.com\/.*?\/(status|statuses)\/\d+/.test(location.href))? 'location' : 'pinned-or-current-link');
      }catch(e) {
        var stdin = [];
      }
      Minibuffer.execute('Twitter::ReTweet|clear-pin',stdin);
    }
  });
}

if(window.Minibuffer){
  boot();
} else {
  window.addEventListener('GM_MinibufferLoaded', boot, false);
}