Add options to headless typings

src/headless/public/Terminal.test.ts

@@ -5,10 +5,11 @@
 
 import { deepStrictEqual, strictEqual, throws } from 'assert';
 import { Terminal } from 'headless/public/Terminal';
+import { ITerminalOptions } from 'xterm-headless';
 
 let term: Terminal;
 
-describe('Headless API Tests', function(): void {
+describe('Headless API Tests', function (): void {
   beforeEach(() => {
     // Create default terminal to be used by most tests
     term = new Terminal();
@@ -119,21 +120,51 @@ describe('Headless API Tests', function(): void {
     strictEqual(term.getOption('scrollback'), 50);
   });
 
+  describe('options', () => {
+    const termOptions = {
+      cols: 80,
+      rows: 24
+    };
+
+    beforeEach(async () => {
+      term = new Terminal(termOptions);
+    });
+    it('get options', () => {
+      const options: ITerminalOptions = term.options;
+      strictEqual(options.cols, 80);
+      strictEqual(options.rows, 24);
+    });
+    it('set options', async () => {
+      const options: ITerminalOptions = term.options;
+      throws(() => options.cols = 40);
+      throws(() => options.rows = 20);
+      term.options.scrollback = 1;
+      strictEqual(term.options.scrollback, 1);
+      term.options= {
+        fontSize: 12,
+        fontFamily: 'Arial'
+      };
+      strictEqual(term.options.fontSize, 12);
+      strictEqual(term.options.fontFamily, 'Arial');
+    });
+  });
+
+
   describe('loadAddon', () => {
     it('constructor', async () => {
       term = new Terminal({ cols: 5 });
       let cols = 0;
       term.loadAddon({
         activate: (t) => cols = t.cols,
-        dispose: () => {}
+        dispose: () => { }
       });
       strictEqual(cols, 5);
     });
 
     it('dispose (addon)', async () => {
       let disposeCalled = false;
       const addon = {
-        activate: () => {},
+        activate: () => { },
         dispose: () => disposeCalled = true
       };
       term.loadAddon(addon);
@@ -145,7 +176,7 @@ describe('Headless API Tests', function(): void {
     it('dispose (terminal)', async () => {
       let disposeCalled = false;
       term.loadAddon({
-        activate: () => {},
+        activate: () => { },
         dispose: () => disposeCalled = true
       });
       strictEqual(disposeCalled, false);

src/headless/public/Terminal.ts

@@ -7,19 +7,61 @@ import { IEvent } from 'common/EventEmitter';
 import { BufferNamespaceApi } from 'common/public/BufferNamespaceApi';
 import { ParserApi } from 'common/public/ParserApi';
 import { UnicodeApi } from 'common/public/UnicodeApi';
-import { IBufferNamespace as IBufferNamespaceApi, IMarker, IModes, IParser, ITerminalAddon, ITerminalOptions, IUnicodeHandling, Terminal as ITerminalApi } from 'xterm-headless';
+import { IBufferNamespace as IBufferNamespaceApi, IMarker, IModes, IParser, ITerminalAddon, IUnicodeHandling, Terminal as ITerminalApi } from 'xterm-headless';
 import { Terminal as TerminalCore } from 'headless/Terminal';
 import { AddonManager } from 'common/public/AddonManager';
+import { ITerminalOptions } from 'common/Types';
+
+/**
+ * The set of options that only have an effect when set in the Terminal constructor.
+ */
+const CONSTRUCTOR_ONLY_OPTIONS = ['cols', 'rows'];
 
 export class Terminal implements ITerminalApi {
   private _core: TerminalCore;
   private _addonManager: AddonManager;
   private _parser: IParser | undefined;
   private _buffer: BufferNamespaceApi | undefined;
+  private _publicOptions: ITerminalOptions;
 
   constructor(options?: ITerminalOptions) {
     this._core = new TerminalCore(options);
     this._addonManager = new AddonManager();
+
+    this._publicOptions = { ... this._core.options };
+    const getter = (propName: string): any => {
+      return this._core.options[propName];
+    };
+    const setter = (propName: string, value: any): void => {
+      this._checkReadonlyOptions(propName);
+      this._core.options[propName] = value;
+    };
+
+    for (const propName in this._core.options) {
+      Object.defineProperty(this._publicOptions, propName, {
+        get: () => {
+          return this._core.options[propName];
+        },
+        set: (value: any) => {
+          this._checkReadonlyOptions(propName);
+          this._core.options[propName] = value;
+        }
+      });
+      const desc = {
+        get: getter.bind(this, propName),
+        set: setter.bind(this, propName)
+      };
+      Object.defineProperty(this._publicOptions, propName, desc);
+    }
+  }
+
+  private _checkReadonlyOptions(propName: string): void {
+    // Throw an error if any constructor only option is modified
+    // from terminal.options
+    // Modifications from anywhere else are allowed
+    if (CONSTRUCTOR_ONLY_OPTIONS.includes(propName)) {
+      throw new Error(`Option "${propName}" can only be set in the constructor`);
+    }
   }
 
   private _checkProposedApi(): void {
@@ -82,6 +124,14 @@ export class Terminal implements ITerminalApi {
       wraparoundMode: m.wraparound
     };
   }
+  public get options(): ITerminalOptions {
+    return this._publicOptions;
+  }
+  public set options(options: ITerminalOptions) {
+    for (const propName in options) {
+      this._publicOptions[propName] = options[propName];
+    }
+  }
   public resize(columns: number, rows: number): void {
     this._verifyIntegers(columns, rows);
     this._core.resize(columns, rows);

typings/xterm-headless.d.ts

@@ -534,6 +534,29 @@ declare module 'xterm-headless' {
      */
     readonly modes: IModes;
 
+    /**
+     * Gets or sets the terminal options. This supports setting multiple options.
+     *
+     * @example Get a single option
+     * ```typescript
+     * console.log(terminal.options.fontSize);
+     * ```
+     *
+     * @example Set a single option
+     * ```typescript
+     * terminal.options.fontSize = 12;
+     * ```
+     *
+     * @example Set multiple options
+     * ```typescript
+     * terminal.options = {
+     *   fontSize: 12,
+     *   fontFamily: 'Arial',
+     * };
+     * ```
+     */
+    options: ITerminalOptions;
+
     /**
      * Natural language strings that can be localized.
      */