ReadLine from io.ReadCloser

I need to find a way to read a line from a io.ReadCloser object OR find a way to split a byte array on a "end line" symbol. However I don't know the end line symbol and I can't find it.

My application execs a php script and needs to get the live output from the script and do "something" with it when it gets it.

Here's a small piece of my code:

cmd := exec.Command(prog, args)   
/* cmd := exec.Command("ls")*/
out, err := cmd.StdoutPipe()
if err != nil {
  fmt.Println(err)
}
err = cmd.Start()
if err != nil {
  fmt.Println(err)
}

after this I monitor the out buffer in a go routine. I've tried 2 ways.

1. nr, er := out.Read(buf) where buf is a byte array. the problem here is that I need to brake the array for each new line
2. my second option is to create a new bufio.reader
   r := bufio.NewReader(out)
line,_,e := r.ReadLine()
   it runs fine if I exec a command like ls, I get the output line by line, but if I exec a php script it immediately get an End Of File error and exits(I'm guessing that's because of the delayed output from php)

EDIT: My problem was I was creating the bufio.Reader inside the go routine whereas if I do it right after the StdoutPipe() like minikomi suggested, it works fine

You can create a reader using bufio, and then read until the next line break character (Note, single quotes to denote character!):

stdout, err := cmd.StdoutPipe()
rd := bufio.NewReader(stdout)
if err := cmd.Start(); err != nil {
	log.Fatal("Buffer Error:", err)
}

for {
	str, err := rd.ReadString('\n')
	if err != nil {
		log.Fatal("Read Error:", err)
		return
	}
	fmt.Println(str)
}

If you're trying to read from the reader in a goroutine with nothing to stop the script, it will exit.

Another option is bufio.NewScanner:

package main

import (
   "bufio"
   "os/exec"
)

func main() {
   cmd := exec.Command("go", "env")
   out, err := cmd.StdoutPipe()
   if err != nil {
      panic(err)
   }
   buf := bufio.NewScanner(out)
   cmd.Start()
   defer cmd.Wait()
   for buf.Scan() {
      println(buf.Text())
   }
}

https://golang.org/pkg/bufio#NewScanner