tab_completion.user.js

// ==UserScript==
// @name        Tab Completion for Campfire
// @namespace   http://code.cimians.com
// @description If you hit tab in the campfire chat window, it will tab complete on user names.
// @author      Mat Schaffer, CIM Engineering
// @homepage    http://code.cimians.com
// @include     *.campfirenow.com/room*
// ==/UserScript==

(function() {
  
  var getSelection = function() {
    var start = $('input').selectionStart;
    var end = $('input').selectionEnd;
    var selection = $('input').value.substring(start, end);
    return selection;
  }
  
  var setName = function(stub, name, doSelect) {
    var ss = $('input').value.length;
   
    var rep = new RegExp(stub+'$','i');
    var input = $('input').value;
    
    $('input').value = input.replace(rep, name);
    if(!doSelect) {
      $('input').value += " ";
      var ss = $('input').value.length;
    }
    var se = $('input').value.length;

    $('input').setSelectionRange(ss,se);
  }
  
  Event.observe('input', 'keypress', function(event) {
    var input = $("input").value;
    if(event.keyCode == 32 && window.tc_matches && window.tc_matches.length) {
      $('input').value += ' ';
      var l = $('input').value.length;
      $('input').setSelectionRange(l,l);
      delete window.tc_matches;
      delete window.tc_stub;
      delete window.tc_index;
    }else if (event.keyCode == 9) {
      
      if(window.tc_matches && window.tc_matches.length > 0) {
        var l = window.tc_matches.length;
        var index = window.tc_index + 1;
        if(index >= l) {
          index = 0;
        }
        var name = window.tc_matches[index];

        var s = getSelection();

        var sr = new RegExp(s+'$','i');

        $('input').value = input.replace(sr,'');
        setName(window.tc_stub, name, true);
        window.tc_index = index;
        return false;
      }
      
      
      var stub = $A(input.split(" ")).last();
      var selection_start = input.length;
      var regexp = new RegExp('^'+stub,'i');
      var matches = [];
      
      $$('.user .name').each(function(user) {
        var name = user.innerHTML;
        // Right now it will use the first match it finds
        // TODO :: keep track of matches and if more than one provide a way to select the right one.
        if(name.match(regexp)) {
          matches.push(name);
        }
      });
      
      if(matches.length > 1) {
        window.tc_matches = matches;
        window.tc_stub = stub;
        window.tc_index = 0;
        setName(stub, matches[0], true);
      } else if(matches.length == 1) {
        setName(stub, matches[0], false);
      }
      
      $('input').focus();
      
    } else if(window.tc_matches && window.tc_matches.length) {
      delete window.tc_matches;
      delete window.tc_stub;
      delete window.tc_index;
    }
  })
})();