debug-log.go

package main

import (
	"log"
	"os"
)

const (
 LogFileName string = "/tmp/go-debug.log"
)

func Debug(s interface{}, label string) {
	f, err := os.OpenFile(LogFileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		log.Fatalf("error opening file: %v", err)
	}
	defer f.Close()

	log.SetOutput(f)
  log.Println("%s : %v", label, s)
}

func DebugRune(s rune,label string) {
	f, err := os.OpenFile(LogFileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		log.Fatalf("error opening file: %v", err)
	}
	defer f.Close()

	log.SetOutput(f)
  log.Printf("%s : %#U", label, s)
}

func DebugRunes(s []rune,label string) {
	f, err := os.OpenFile(LogFileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		log.Fatalf("error opening file: %v", err)
	}
	defer f.Close()

	log.SetOutput(f)
	for i, ss := range s {
    log.Printf("%s : %#U : %d", label, ss, i)
	}
}