Add some emacs keybindings. Fixes #371

Add the most commonly used emacs/readline keybindings to input field and
document them.
Also change the wording on some of the old descritions to clarify
intent.

index.html

@@ -114,12 +114,14 @@
               <ul>
                 <li>ALT-n: Toggle nicklist</li>
                 <li>ALT-l: Focus on input bar</li>
-                <li>ALT-[0-9]: Focus on buffer</li>
+                <li>ALT-[0-9]: Switch to buffer number N</li>
                 <li>ALT-a: Focus on next buffer with activity</li>
-                <li>ALT-&lt;: Switch to previous buffer</li>
+                <li>ALT-&lt;: Switch to previous active buffer</li>
                 <li>ALT-g: Focus on buffer list filter</li>
                 <li>Esc-Esc: disconnect (double-tap)</li>
-                <li>arrow keys: history navigation</li>
+                <li>Arrow keys: history navigation</li>
+                <li>Tab key: nick complete</li>
+                <li>The following readline/emacs style keybindings works: Ctrl-a, Ctrl-e, Ctrl-u, Ctrl-k, Ctrl-w</li>
               </ul>
               </div>
             </div>

js/glowingbear.js

@@ -1517,12 +1517,45 @@ weechat.directive('inputBar', function() {
                 }
 
                 // Enter to submit, shift-enter for newline
-                //
                 if (code == 13 && !$event.shiftKey && document.activeElement === inputNode) {
                     $event.preventDefault();
                     $scope.sendMessage();
                     return true;
                 }
+                // Some readline keybindings
+                if ($event.ctrlKey && !$event.altKey && !$event.shiftKey && document.activeElement === inputNode) {
+                    // Ctrl-a
+                    if (code == 65) {
+                        inputNode.setSelectionRange(0, 0);
+                    // Ctrl-e
+                    } else if (code == 69) {
+                        inputNode.setSelectionRange($scope.command.length, $scope.command.length);
+                    // Ctrl-u
+                    } else if (code == 85) {
+                        $scope.command = $scope.command.slice(caretPos);
+                        setTimeout(function() {
+                            inputNode.setSelectionRange(0, 0);
+                        });
+                    // Ctrl-k
+                    } else if (code == 75) {
+                        $scope.command = $scope.command.slice(0, caretPos);
+                        setTimeout(function() {
+                            inputNode.setSelectionRange($scope.command.length, $scope.command.length);
+                        });
+                    // Ctrl-w
+                    } else if (code == 87) {
+                        var trimmedValue = $scope.command.slice(0, caretPos);
+                        var lastSpace = trimmedValue.lastIndexOf(' ') + 1;
+                        $scope.command = $scope.command.slice(0, lastSpace) + $scope.command.slice(caretPos, $scope.command.length);
+                        setTimeout(function() {
+                            inputNode.setSelectionRange(lastSpace, lastSpace);
+                        });
+                    } else {
+                        return false;
+                    }
+                    $event.preventDefault();
+                    return true;
+                }
             };
         }
     };