12345678910111213141516171819202122232425
import { isWindows } from "./util.ts";import { VR_SHELL } from "./consts.ts";
const OS_SHELL_ENV_NAME = isWindows ? "ComSpec" : "SHELL";const OS_FALLBACK_SHELL = isWindows ? "cmd.exe" : "sh";
export function resolveShell(): string {  let shell = Deno.env.get(VR_SHELL);  if (!shell && isWindows) {    shell = "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe";  }  if (validateShellFile(shell)) return shell as string;  shell = Deno.env.get(OS_SHELL_ENV_NAME);  if (validateShellFile(shell)) return shell as string;  return OS_FALLBACK_SHELL;}
function validateShellFile(shell: string | undefined) {  try {    return shell && Deno.statSync(shell).isFile; // TODO check executable  } catch (e) {    // Use fallback shell  }}