Go的分页输出

Question

I'm trying print to stdout from golang using $PAGER or manually invoking more or less to allow the user to easily scroll through a lot of options. How can I achieve this?

Answer 1

You can use the os/exec package to start a process that runs less (or whatever is in $PAGER) and then pipe a string to its standard input. The following worked for me:

func main() {
    // Could read $PAGER rather than hardcoding the path.
    cmd := exec.Command("/usr/bin/less")

    // Feed it with the string you want to display.
    cmd.Stdin = strings.NewReader("The text you want to show.")

    // This is crucial - otherwise it will write to a null device.
    cmd.Stdout = os.Stdout

    // Fork off a process and wait for it to terminate.
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
}