Function resolveLaunchCommand

src/workspaces/win-command.ts:46–74

(
  argv: readonly string[],
  opts: { platform?: NodeJS.Platform; env?: NodeJS.ProcessEnv } = {},
)

const DEFAULT_PATHEXT = '.COM;.EXE;.BAT;.CMD';

export function resolveLaunchCommand(
  argv: readonly string[],
  opts: { platform?: NodeJS.Platform; env?: NodeJS.ProcessEnv } = {},
): ResolvedCommand {
  const platform = opts.platform ?? process.platform;
  const env = opts.env ?? process.env;
  if (platform !== 'win32' || argv.length === 0) return { argv, viaShell: false };

  const [name, ...rest] = argv;
  if (!name) return { argv, viaShell: false };
  // Caller gave an explicit path or extension → trust it, don't re-resolve.
  if (name.includes('/') || name.includes('\\') || /\.[^.\\/]+$/.test(name)) {
    return { argv, viaShell: false };
  }

  const resolved = lookupOnWindowsPath(name, env);
  if (!resolved) return { argv, viaShell: false }; // fail loudly with original name

  const dot = resolved.lastIndexOf('.');
  const ext = dot >= 0 ? resolved.slice(dot).toLowerCase() : '';
  if (ext === '.cmd' || ext === '.bat') {
    const comspec = env['ComSpec'] || env['COMSPEC'] || 'cmd.exe';
    // /d skips any AutoRun registry command; /c runs then exits. The shim path
    // is a single arg (node-pty/Node quote it if it contains spaces); cmd's
    // default rule preserves a single quoted-executable + bare args correctly.
    return { argv: [comspec, '/d', '/c', resolved, ...rest], viaShell: true };
  }
  return { argv: [resolved, ...rest], viaShell: false };
}

function lookupOnWindowsPath(name: string, env: NodeJS.ProcessEnv): string | null {
  const exts = (env['PATHEXT'] ?? DEFAULT_PATHEXT)