nushell

type Error struct {
	Msg    string
	Stderr string
}

type Job struct {
	Command string
	// Tables are what the pipeline reads, by variable name, as NUON:
	// each becomes the variable of its name.
	Tables map[string][]byte
	// Config runs nu with the user's config files rather than without.
	Config bool
	// Vars are the variables the run hands back beside its output: the
	// command ends in a record of its output, as __out, and each of
	// them, and the run prints each as a line of its own (ExecVars).
	Vars []string
	// IDE asks nu about the script rather than running it: the flags
	// that ask (--ide-ast, or --ide-complete 14), nu reading the script
	// from a file named after them, without config files or the
	// standard library (see ide.go).
	IDE []string
}

type Nu struct {
	// Path is the program; "" finds nu on the PATH.
	Path string
}

type Problem struct {
	From, To int
	Severity string // Error or Warning
	Msg      string
}

type Runner interface {
	Run(ctx context.Context, job Job, script string, stdout io.Writer) error
}

type Shape struct {
	From, To int
	Shape    string
}