package raft

import (
	"fmt"
	"io"
	"os"
	"runtime"
)

// TODO: this is just copied over from cmd/utils/cmd.go. dedupe

// Fatalf formats a message to standard error and exits the program.
// The message is also printed to standard output if standard error
// is redirected to a different file.
func fatalf(format string, args ...interface{}) {
	w := io.MultiWriter(os.Stdout, os.Stderr)
	if runtime.GOOS == "windows" {
		// The SameFile check below doesn't work on Windows.
		// stdout is unlikely to get redirected though, so just print there.
		w = os.Stdout
	} else {
		outf, _ := os.Stdout.Stat()
		errf, _ := os.Stderr.Stat()
		if outf != nil && errf != nil && os.SameFile(outf, errf) {
			w = os.Stderr
		}
	}
	fmt.Fprintf(w, "Fatal: "+format+"\n", args...)
	os.Exit(1)
}