ReadLine from io.ReadCloser

go

Solution

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.

Problem

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

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