code: function(command, arg) {
          var docs = [];
          docs.push('<strong><tt> &gt; ');
          docs.push(command.name);
          if (command.params && command.params.length > 0) {
              command.params.forEach(function(param) {
                  if (param.defaultValue === undefined) {
                      docs.push(' [' + param.name + ']');
                  }
                  else {
                      docs.push(' <em>[' + param.name + ']</em>');
                  }
              }, this);
          }
          docs.push('</tt></strong><br/>');
  
          docs.push(command.description ? command.description : '(No description)');
          docs.push('<br/>');
  
          if (command.params && command.params.length > 0) {
              docs.push('<ul>');
              command.params.forEach(function(param) {
                  docs.push('<li>');
                  docs.push('<strong><tt>' + param.name + '</tt></strong>: ');
                  docs.push(param.description ? param.description : '(No description)');
                  if (param.defaultValue === undefined) {
                      docs.push(' <em>[Required]</em>');
                  }
                  else if (param.defaultValue === null) {
                      docs.push(' <em>[Optional]</em>');
                  }
                  else {
                      docs.push(' <em>[Default: ' + param.defaultValue + ']</em>');
                  }
                  docs.push('</li>');
              }, this);
              docs.push('</ul>');
          }
  
          return new Hint(Status.VALID, docs.join(''), arg);
      }
docs: Provide some documentation for a command.