Adds support for column selections if holding alt on mac and shift on windows/linux

src/Terminal.ts

@@ -590,6 +590,8 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
       if (!wasMondifierKeyOnlyEvent(ev)) {
         this.focus();
       }
+
+      self._keyUp(ev);
     }, true);
 
     on(this.textarea, 'keydown', (ev: KeyboardEvent) => this._keyDown(ev), true);
@@ -696,7 +698,7 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
 
     this.selectionManager = new SelectionManager(this, this.charMeasure);
     this.element.addEventListener('mousedown', (e: MouseEvent) => this.selectionManager.onMouseDown(e));
-    this.selectionManager.on('refresh', data => this.renderer.onSelectionChanged(data.start, data.end));
+    this.selectionManager.on('refresh', data => this.renderer.onSelectionChanged(data.start, data.end, data.columnSelectMode));
     this.selectionManager.on('newselection', text => {
       // If there's a new selection, put it into the textarea, focus and select it
       // in order to register it as a selection on the OS. This event is fired
@@ -1098,6 +1100,17 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
     }
   }
 
+  /**
+   * Change the cursor style for different selection modes
+   */
+  public updateCursorStyle(ev: KeyboardEvent): void {
+    if (this.selectionManager.isColumnSelectMode(ev)) {
+      this.element.classList.add('xterm-cursor-crosshair');
+    } else {
+      this.element.classList.remove('xterm-cursor-crosshair');
+    }
+  }
+
   /**
    * Display the cursor element
    */
@@ -1415,6 +1428,8 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
 
     const result = evaluateKeyboardEvent(event, this.applicationCursor, this.browser.isMac, this.options.macOptionIsMeta);
 
+    this.updateCursorStyle(event);
+
     // if (result.key === C0.DC3) { // XOFF
     //   this._writeStopped = true;
     // } else if (result.key === C0.DC1) { // XON
@@ -1486,6 +1501,11 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
     }
   }
 
+  protected _keyUp(ev: KeyboardEvent): boolean {
+    this.updateCursorStyle(ev);
+    return true;
+  }
+
   /**
    * Handle a keypress event.
    * Key Resources: