Create BufferService

src/common/services/BufferService.ts

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { IBufferService, IOptionsService } from './Services';
+
+export const MINIMUM_COLS = 2; // Less than 2 can mess with wide chars
+export const MINIMUM_ROWS = 1;
+
+export class BufferService implements IBufferService {
+  public cols: number;
+  public rows: number;
+
+  constructor(
+    optionsService: IOptionsService
+  ) {
+    this.cols = Math.max(optionsService.options.cols, MINIMUM_COLS);
+    this.rows = Math.max(optionsService.options.rows, MINIMUM_ROWS);
+  }
+
+  public resize(cols: number, rows: number): void {
+    this.cols = cols;
+    this.rows = rows;
+  }
+}

src/common/services/Services.d.ts

@@ -5,6 +5,15 @@
 
 import { IEvent } from 'common/EventEmitter2';
 
+export interface IBufferService {
+  readonly cols: number;
+  readonly rows: number;
+
+  // TODO: Move resize event here
+
+  resize(cols: number, rows: number): void;
+}
+
 export interface IOptionsService {
   readonly options: ITerminalOptions;