Product Backlog - Move Line Up/Down on Key

src/command/Commands.js

@@ -60,6 +60,8 @@ define(function (require, exports, module) {
     exports.EDIT_UNINDENT               = "edit.unindent";
     exports.EDIT_DUPLICATE              = "edit.duplicate";
     exports.EDIT_LINE_COMMENT           = "edit.lineComment";
+    exports.EDIT_LINE_UP                = "edit.lineUp";
+    exports.EDIT_LINE_DOWN              = "edit.lineDown";
     exports.TOGGLE_USE_TAB_CHARS        = "debug.useTabChars";
 
     // VIEW

src/command/Menus.js

@@ -856,6 +856,15 @@ define(function (require, exports, module) {
         menu.addMenuItem(Commands.EDIT_INDENT,          [{key: "Indent", displayKey: "Tab"}]);
         menu.addMenuItem(Commands.EDIT_UNINDENT,        [{key: "Unindent", displayKey: "Shift-Tab"}]);
         menu.addMenuItem(Commands.EDIT_DUPLICATE,       "Ctrl-D");
+        menu.addMenuItem(Commands.EDIT_LINE_UP,         [{key: "Ctrl-Shift-Up", displayKey: "Ctrl-Shift-\u2191",
+                                                          platform: "win"},
+                                                         {key:  "Cmd-Ctrl-Up", displayKey: "Cmd-Ctrl-\u2191",
+                                                          platform: "mac"}]);
+        menu.addMenuItem(Commands.EDIT_LINE_DOWN,       [{key: "Ctrl-Shift-Down", displayKey: "Ctrl-Shift-\u2191",
+                                                          platform: "win"},
+                                                         {key:  "Cmd-Ctrl-Down", displayKey: "Cmd-Ctrl-\u2191",
+                                                          platform: "mac"}]);
+        menu.addMenuDivider();
         menu.addMenuItem(Commands.EDIT_LINE_COMMENT,    "Ctrl-/");
         menu.addMenuDivider();
         menu.addMenuItem(Commands.TOGGLE_USE_TAB_CHARS);

src/editor/EditorCommandHandlers.js

@@ -38,6 +38,12 @@ define(function (require, exports, module) {
         EditorManager      = require("editor/EditorManager");
 
 
+    /**
+     * List of constants
+     */
+    var DIRECTION_UP    = -1;
+    var DIRECTION_DOWN  = +1;
+
     /**
      * Add or remove line-comment tokens to all the lines in the selected range, preserving selection
      * and cursor position. Applies to currently focused Editor.
@@ -152,6 +158,86 @@ define(function (require, exports, module) {
         var selectedText = doc.getRange(sel.start, sel.end) + delimiter;
         doc.replaceRange(selectedText, sel.start);
     }
+
+    /**
+     * Moves the selected text, or current line if no selection. The cursor/selection 
+     * moves with the line/lines.
+     * @param {Editor} editor - target editor
+     * @param {Number} direction - direction of the move (-1,+1) => (Up,Down)
+     */
+    function moveLine(editor, direction) {
+        editor = editor || EditorManager.getFocusedEditor();
+        if (!editor) {
+            return;
+        }
+
+        var doc = editor.document,
+            sel = editor.getSelection(),
+            originalSel = editor.getSelection(),
+            hasSelection = (sel.start.line !== sel.end.line) || (sel.start.ch !== sel.end.ch);
+
+        sel.start.ch = 0;
+        // The end of the selection becomes the start of the next line, if it isn't already
+        if (!hasSelection || sel.end.ch !== 0) {
+            sel.end = {line: sel.end.line + 1, ch: 0};
+        }
+
+        // Make the move
+        switch (direction) {
+        case DIRECTION_UP:
+            if (sel.start.line !== 0) {
+                doc.batchOperation(function () {
+                    var prevText = doc.getRange({ line: sel.start.line - 1, ch: 0 }, sel.start);
+
+                    if (sel.end.line === editor.lineCount()) {
+                        prevText = "\n" + prevText.substring(0, prevText.length - 1);
+                    }
+
+                    doc.replaceRange("", { line: sel.start.line - 1, ch: 0 }, sel.start);
+                    doc.replaceRange(prevText, { line: sel.end.line - 1, ch: 0 });
+
+                    // Make sure CodeMirror hasn't expanded the selection to include
+                    // the line we inserted below.
+                    originalSel.start.line--;
+                    originalSel.end.line--;
+                    editor.setSelection(originalSel.start, originalSel.end);
+                });
+            }
+            break;
+        case DIRECTION_DOWN:
+            if (sel.end.line < editor.lineCount()) {
+                doc.batchOperation(function () {
+                    var nextText = doc.getRange(sel.end, { line: sel.end.line + 1, ch: 0 });
+
+                    var deletionStart = sel.end;
+                    if (sel.end.line === editor.lineCount() - 1) {
+                        nextText += "\n";
+                        deletionStart = { line: sel.end.line - 1, ch: doc.getLine(sel.end.line - 1).length };
+                    }
+
+                    doc.replaceRange("", deletionStart, { line: sel.end.line + 1, ch: 0 });
+                    doc.replaceRange(nextText, { line: sel.start.line, ch: 0 });
+                });
+            }
+            break;
+        }
+    }
+
+    /**
+     * Moves the selected text, or current line if no selection, one line up. The cursor/selection 
+     * moves with the line/lines.
+     */
+    function moveLineUp(editor) {
+        moveLine(editor, DIRECTION_UP);
+    }
+
+    /**
+     * Moves the selected text, or current line if no selection, one line down. The cursor/selection 
+     * moves with the line/lines.
+     */
+    function moveLineDown(editor) {
+        moveLine(editor, DIRECTION_DOWN);
+    }
 
     /**
      * Indent a line of text if no selection. Otherwise, indent all lines in selection.
@@ -182,4 +268,6 @@ define(function (require, exports, module) {
     CommandManager.register(Strings.CMD_UNINDENT,       Commands.EDIT_UNINDENT,     unidentText);
     CommandManager.register(Strings.CMD_COMMENT,        Commands.EDIT_LINE_COMMENT, lineComment);
     CommandManager.register(Strings.CMD_DUPLICATE,      Commands.EDIT_DUPLICATE,    duplicateText);
+    CommandManager.register(Strings.CMD_LINE_UP,        Commands.EDIT_LINE_UP,      moveLineUp);
+    CommandManager.register(Strings.CMD_LINE_DOWN,      Commands.EDIT_LINE_DOWN,    moveLineDown);
 });

src/strings.js

@@ -124,6 +124,8 @@ define(function (require, exports, module) {
     exports.CMD_UNINDENT                        = "Unindent";
     exports.CMD_DUPLICATE                       = "Duplicate";
     exports.CMD_COMMENT                         = "Comment/Uncomment Lines";
+    exports.CMD_LINE_UP                         = "Move Line(s) Up";
+    exports.CMD_LINE_DOWN                       = "Move Line(s) Down";
 
     // View menu commands
     exports.VIEW_MENU                           = "View";