exec_tools.go

package mttools

import (
	"bufio"
	"fmt"
	"io"
	"os/exec"
)

// Executes cmd and returns its output or err
func ExecCmd(cmd_path string, args []string) (string, error) {
	cmd := exec.Command(cmd_path, args...)

	buffer, err := cmd.CombinedOutput()

	return string(buffer), err
}

// Executes cmd and prints its output
func ExecCmdPrint(cmd_path string, args []string) error {
	out, err := ExecCmd(cmd_path, args)

	fmt.Print(out)
	return err
}

// Executes cmd printing its output to stdout during execution
func ExecCmdWaitPrint(cmd_path string, args []string) error {
	cmd := exec.Command(cmd_path, args...)
	//fmt.Println("CMD: " + cmd.String())

	var stdout_pipe, stderr_pipe io.ReadCloser
	var err error

	if stdout_pipe, err = cmd.StdoutPipe(); err != nil {
		return err
	}

	if stderr_pipe, err = cmd.StderrPipe(); err != nil {
		return err
	}

	if err = cmd.Start(); err != nil {
		return err
	}

	stdout_scanner := bufio.NewScanner(stdout_pipe)
	stderr_scanner := bufio.NewScanner(stderr_pipe)

	f := true
	for f {
		stdout := stdout_scanner.Scan()
		stderr := stderr_scanner.Scan()

		if stdout {
			fmt.Println(stdout_scanner.Text())
		}

		if stderr {
			fmt.Println(stderr_scanner.Text())
		}

		f = stdout || stderr
	}

	return cmd.Wait()
}