Introduce new Buffer and BufferSet classes

src/BufferSet.ts

@@ -0,0 +1,44 @@
+/**
+ * @license MIT
+ */
+
+import { ITerminal } from './Interfaces';
+import { Buffer } from './Buffer';
+
+export class BufferSet {
+  private _normal: Buffer;
+  private _alt: Buffer;
+  private _activeBuffer: Buffer;
+
+  constructor(private _terminal: ITerminal) {
+    this._normal = new Buffer(this._terminal);
+    this._alt = new Buffer(this._terminal);
+    this._activeBuffer = this._normal;
+  }
+
+  public get alt(): Buffer {
+    return this._alt;
+  }
+
+  public get active(): Buffer {
+    return this._activeBuffer;
+  }
+
+  public get normal(): Buffer {
+    return this._normal;
+  }
+
+  private resetTerminal() {
+    this._terminal.reset();
+    this._terminal.viewport.syncScrollArea();
+    this._terminal.showCursor();
+  }
+
+  public activateNormalBuffer(): void {
+    this._activeBuffer = this._normal;
+  }
+
+  public activateAltBuffer(): void {
+    this._activeBuffer = this._normal;
+  }
+}