Add initialText proposed API

Part of #120368

src/vs/vscode.proposed.d.ts

@@ -812,6 +812,19 @@ declare module 'vscode' {
 
 	//#endregion
 
+	//#region Terminal initial text https://github.com/microsoft/vscode/issues/120368
+
+	export interface TerminalOptions {
+		/**
+		 * Initial text to write to the terminal, note that this is not sent to the process but
+		 * rather written directly to the terminal. This supports escape sequences such a setting
+		 * text style.
+		 */
+		readonly initialText?: string;
+	}
+
+	//#endregion
+
 	// eslint-disable-next-line vscode-dts-region-comments
 	//#region @jrieken -> exclusive document filters
 

src/vs/workbench/api/browser/mainThreadTerminalService.ts

@@ -123,6 +123,7 @@ export class MainThreadTerminalService implements MainThreadTerminalServiceShape
 			executable: launchConfig.shellPath,
 			args: launchConfig.shellArgs,
 			cwd: typeof launchConfig.cwd === 'string' ? launchConfig.cwd : URI.revive(launchConfig.cwd),
+			initialText: launchConfig.initialText,
 			waitOnExit: launchConfig.waitOnExit,
 			ignoreConfigurationCwd: true,
 			env: launchConfig.env,

src/vs/workbench/api/common/extHost.api.impl.ts

@@ -633,6 +633,9 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 					if ('pty' in nameOrOptions) {
 						return extHostTerminalService.createExtensionTerminal(nameOrOptions);
 					}
+					if (nameOrOptions.initialText) {
+						checkProposedApiEnabled(extension);
+					}
 					return extHostTerminalService.createTerminalFromOptions(nameOrOptions);
 				}
 				return extHostTerminalService.createTerminal(nameOrOptions, shellPath, shellArgs);

src/vs/workbench/api/common/extHost.protocol.ts

@@ -455,6 +455,7 @@ export interface TerminalLaunchConfig {
 	shellArgs?: string[] | string;
 	cwd?: string | UriComponents;
 	env?: ITerminalEnvironment;
+	initialText?: string;
 	waitOnExit?: boolean;
 	strictEnv?: boolean;
 	hideFromUser?: boolean;

src/vs/workbench/api/common/extHostTerminalService.ts

@@ -118,6 +118,7 @@ export class ExtHostTerminal {
 		shellArgs?: string[] | string,
 		cwd?: string | URI,
 		env?: ITerminalEnvironment,
+		initialText?: string,
 		waitOnExit?: boolean,
 		strictEnv?: boolean,
 		hideFromUser?: boolean,
@@ -127,7 +128,7 @@ export class ExtHostTerminal {
 		if (typeof this._id !== 'string') {
 			throw new Error('Terminal has already been created');
 		}
-		await this._proxy.$createTerminal(this._id, { name: this._name, shellPath, shellArgs, cwd, env, waitOnExit, strictEnv, hideFromUser, isFeatureTerminal, isExtensionOwnedTerminal });
+		await this._proxy.$createTerminal(this._id, { name: this._name, shellPath, shellArgs, cwd, env, initialText, waitOnExit, strictEnv, hideFromUser, isFeatureTerminal, isExtensionOwnedTerminal });
 	}
 
 	public async createExtensionTerminal(): Promise<number> {

src/vs/workbench/api/node/extHostTerminalService.ts

@@ -65,6 +65,7 @@ export class ExtHostTerminalService extends BaseExtHostTerminalService {
 			withNullAsUndefined(options.shellArgs),
 			withNullAsUndefined(options.cwd),
 			withNullAsUndefined(options.env),
+			withNullAsUndefined(options.initialText),
 			/*options.waitOnExit*/ undefined,
 			withNullAsUndefined(options.strictEnv),
 			withNullAsUndefined(options.hideFromUser),