1// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
2// Use of this source code is governed by the MIT license that can be
3// found in the LICENSE file.
4
5package notify
6
7import (
8	"log"
9	"os"
10	"runtime"
11	"strings"
12)
13
14var dbgprint func(...interface{})
15
16var dbgprintf func(string, ...interface{})
17
18var dbgcallstack func(max int) []string
19
20func init() {
21	if _, ok := os.LookupEnv("NOTIFY_DEBUG"); ok || debugTag {
22		log.SetOutput(os.Stdout)
23		log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)
24		dbgprint = func(v ...interface{}) {
25			v = append([]interface{}{"[D] "}, v...)
26			log.Println(v...)
27		}
28		dbgprintf = func(format string, v ...interface{}) {
29			format = "[D] " + format
30			log.Printf(format, v...)
31		}
32		dbgcallstack = func(max int) []string {
33			pc, stack := make([]uintptr, max), make([]string, 0, max)
34			runtime.Callers(2, pc)
35			for _, pc := range pc {
36				if f := runtime.FuncForPC(pc); f != nil {
37					fname := f.Name()
38					idx := strings.LastIndex(fname, string(os.PathSeparator))
39					if idx != -1 {
40						stack = append(stack, fname[idx+1:])
41					} else {
42						stack = append(stack, fname)
43					}
44				}
45			}
46			return stack
47		}
48		return
49	}
50	dbgprint = func(v ...interface{}) {}
51	dbgprintf = func(format string, v ...interface{}) {}
52	dbgcallstack = func(max int) []string { return nil }
53}
54