package cmd

import (
	"bytes"
	"fmt"
	"os/exec"
)

func Exec(cmdStr string) (string, error) {
	cmd := exec.Command("bash", "-c", cmdStr)
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr
	err := cmd.Run()
	if err != nil {
		errMsg := ""
		if len(stderr.String()) != 0 {
			errMsg = fmt.Sprintf("stderr: %s", stderr.String())
		}
		if len(stdout.String()) != 0 {
			if len(errMsg) != 0 {
				errMsg = fmt.Sprintf("%s; stdout: %s", errMsg, stdout.String())
			} else {
				errMsg = fmt.Sprintf("stdout: %s", stdout.String())
			}
		}
		return errMsg, err
	}
	return stdout.String(), nil
}

func Execf(cmdStr string, a ...interface{}) (string, error) {
	cmd := exec.Command("bash", "-c", fmt.Sprintf(cmdStr, a...))
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr
	err := cmd.Run()
	if err != nil {
		errMsg := ""
		if len(stderr.String()) != 0 {
			errMsg = fmt.Sprintf("stderr: %s", stderr.String())
		}
		if len(stdout.String()) != 0 {
			if len(errMsg) != 0 {
				errMsg = fmt.Sprintf("%s; stdout: %s", errMsg, stdout.String())
			} else {
				errMsg = fmt.Sprintf("stdout: %s", stdout.String())
			}
		}
		return errMsg, err
	}
	return stdout.String(), nil
}