current static method

SystemShell? current({ Map<String, String>? environmentOverride, })

Identifies the current shell based on the Platform.environment.

Pass environmentOverride to override the default value of Platform.environment.

Based on https://stackoverflow.com/a/3327022

Implementation

static SystemShell? current({
  Map<String, String>? environmentOverride,
}) {
  final environment = environmentOverride ?? Platform.environment;

  // Heuristic: if ZSH_NAME is set, must be zsh
  final isZSH = environment['ZSH_NAME'] != null;
  if (isZSH) {
    return SystemShell.zsh;
  }

  // Heuristic: if BASH is set, must be bash
  final isBash = environment['BASH'] != null;
  if (isBash) {
    return SystemShell.bash;
  }

  final envShell = environment['SHELL'];
  if (envShell == null || envShell.isEmpty) return null;

  final basename = path.basename(envShell);

  if (basename == 'zsh') {
    return SystemShell.zsh;
  } else if (RegExp(r'bash(\.exe)?$').hasMatch(basename)) {
    // On windows basename can be bash.exe
    return SystemShell.bash;
  }
  return null;
}