Terminal listener

[ShMcK]

There are cases where tests require running terminal commands - however, if a command doesn't change the file system - there currently isn't a way to detect when to run the tests. It would be great if the extension could listen to commands typed in.

It seems VSCode has a feature for this called a "Pseudoterminal".
https://code.visualstudio.com/api/references/vscode-api#Pseudoterminal
https://code.visualstudio.com/updates/v1_37#_extension-terminals

[ShMcK]

I created a pseudoterminal included below.

The downside to a pseudoterminal is that it is not a real terminal, and can only mimic a real terminal experience - though quite well. There may be a use for this in the future.

'use strict';

import * as vscode from 'vscode';
import { exec as cpExec } from 'child_process'
import { promisify } from 'util'

const exec = promisify(cpExec)

const defaultLine = '→ ';

const formatText = (text: string) => {
	return `\r${text.split(/(\r?\n)/g).join('\r')}\r`
}

export function activate(context: vscode.ExtensionContext) {
	const writeEmitter = new vscode.EventEmitter<string>();
	context.subscriptions.push(vscode.commands.registerCommand('extensionTerminalSample.create', () => {
		let line = defaultLine;
		const workspaceRoots: readonly vscode.WorkspaceFolder[] | undefined = vscode.workspace.workspaceFolders
		if (!workspaceRoots || !workspaceRoots.length) {
			// no workspace root
			return ''
		}
		const workspaceRoot: string = workspaceRoots[0].uri.fsPath || ''

		const pty = {
			onDidWrite: writeEmitter.event,
			open: () => writeEmitter.fire(line),
			close: () => {},
			handleInput: async (data: string) => {
				
				if (data === '\r') { // Enter
					// const previousCommand = `\r${line}\r`
					// console.log(previousCommand)
					// writeEmitter.fire(previousCommand);
					const command = line.slice(2) // trim off leading default prompt
					const { stdout, stderr } = await exec(command, { encoding: 'utf8', cwd: workspaceRoot })
					if (stdout) {
						const output = formatText(stdout)
						writeEmitter.fire(output);
					}
					
					if (stderr && stderr.length) { 
						writeEmitter.fire(formatText(stderr));
					}
					line = defaultLine;
					writeEmitter.fire(`\r${line}`)
					return;
				}
				if (data === '\x7f') { // Backspace
					if (line.length <= 2) {
						return;
					}
					line = line.substr(0, line.length - 1);
					// Move cursor backward
					writeEmitter.fire('\x1b[D');
					// Delete character
					writeEmitter.fire('\x1b[P');
					return;
				}
				line += data;
				writeEmitter.fire(data);
			}
		};
		const terminal = (<any>vscode.window).createTerminal({ name: `PseudoTerminal Demo`, pty });
		terminal.show();
	}));

	context.subscriptions.push(vscode.commands.registerCommand('extensionTerminalSample.clear', () => {
		writeEmitter.fire('\x1b[2J\x1b[3J\x1b[;H');
	}));
}

[ShMcK]

No longer needed.

Working solutions copies terminal logs to a file for review.