golang package stack

包堆栈实现了捕获、操作和格式化，提供了比runtime包更简单的API。
官方文档： https://godoc.org/github.com/go-stack/stack

import “github.com/go-stack/stack”

package main

import (
	"fmt"

	"github.com/go-stack/stack"
)

func main() {
	logCaller("%+s")
	logCaller("%v   %[1]n()")
}

func logCaller(format string) {
	fmt.Printf(format+"\n", stack.Caller(1))
}

运行结果：
test/main.go
main.go:11 main()

---

type Call struct {
	frame runtime.Frame
}

func Caller(skip int) Call

调用方从当前goroutine的堆栈中返回一个调用。参数skip是要提升的堆栈帧数，0表示调用函数。

func (c Call) Format(s fmt.State, verb rune)

实现了fmt格式。支持以下格式化程序。

%s    source file
%d    line number
%n    function name
%k    last segment of the package path
%v    equivalent to %s:%d

它接受以下大多数动词的“+”和“#”标志。

%+s   path of source file relative to the compile time GOPATH,
      or the module path joined to the path of source file relative
      to module root
%#s   full path of source file
%+n   import path qualified function name
%+k   full package path
%+v   equivalent to %+s:%d
%#v   equivalent to %#s:%d

---

package main

import (
	"fmt"

	"github.com/go-stack/stack"
)

func main() {
	fmt.Printf("%s\n", stack.Caller(0))
	fmt.Printf("%d\n", stack.Caller(0))
	fmt.Printf("%n\n", stack.Caller(0))
	fmt.Printf("%k\n", stack.Caller(0))
	fmt.Printf("%v\n", stack.Caller(0))

	fmt.Println()
	fmt.Printf("%+s\n", stack.Caller(0))
	fmt.Printf("%#s\n", stack.Caller(0))
	fmt.Printf("%+n\n", stack.Caller(0))
	fmt.Printf("%+k\n", stack.Caller(0))
	fmt.Printf("%+v\n", stack.Caller(0))
	fmt.Printf("%#v\n", stack.Caller(0))
}

运行结果：
main.go
11
main
main
main.go:14

test/main.go
/root/gocode/src/test/main.go
main.main
main
test/main.go:21
/root/gocode/src/test/main.go:22