package instruction

import (
	"fmt"
	"os"
	"strings"
)

type run struct {
	raw string
}

func (d *run) Raw() string { return strings.Join([]string{"run", d.raw}, " ") }

func (d *run) Build(_args string) error {
	d.raw = _args
	return nil
}

func (d run) Exec(ctx ExecutionContext) ([]byte, error) {

	// 1. fail if file not found
	if _, err := os.Stat(d.raw); os.IsNotExist(err) {
		return nil, fmt.Errorf("cannot find script '%s'", d.raw)
	}

	// 2. execute script
	if err := ctx.Executor.Command(d.raw).Run(); err != nil {
		return nil, fmt.Errorf("cannot run '%s' | %s", d.raw, err)
	}

	return nil, nil

}