shell

type ExecError struct {
	Task string
	Line string
	Span token.Span
	Code int
	Err  error
}

type Line struct {
	Text            string
	NoEcho          bool
	ContinueOnError bool
	Span            token.Span
}

type Options struct {
	Stdin  io.Reader
	Stdout io.Writer
	Stderr io.Writer
	Dir    string   // working directory ("" => current)
	Env    []string // KEY=VALUE pairs (nil => inherit os.Environ)
	Quiet  bool     // suppress command echo
	// EchoStyle, if non-nil, wraps each echoed command line for display (e.g.
	// dimming). It is applied only AFTER the NoEcho/Quiet suppression check, so
	// it never causes a suppressed line to appear, and must add only zero-width
	// styling without altering the line's text.
	EchoStyle func(string) string
}