英文:
go generate to substitute statement location
问题
我正在使用一个策略来在代码中添加日志语句的位置。
例如：fmt.Println("main.go:myFunction(): There was an error:", e)
我该如何使用go generate来实现以下功能：
fmt.Println("%fn%: There was an error:", e)
并且它会替换为Go文件的名称、封闭函数的名称和行号？
英文:
I'm using a policy to add the location of the log statement in code.
Eg. fmt.Println("main.go:myFunction(): There was an error:", e)
How would I use go generate to do something like
fmt.Println("%fn%: There was an error:", e)
and it will substitute the name of the go file, the enclosing function name, and the line number?
答案1
得分: 4
package mainimport ("fmt""runtime")func Trace() (file string, funcName string, line int, ok bool) {pc, file, line, ok := runtime.Caller(1)f := runtime.FuncForPC(pc)return file, f.Name(), line, ok}func myFunc() {fmt.Println(Trace())}func main() {fmt.Println(Trace())myFunc()}
输出：
/prog.go main.main 19 true/prog.go main.myFunc 15 true
英文:
Package runtime and Caller() can help here
1 package main23 import (4 "fmt"5 "runtime"6 )78 func Trace () (file string, funcName string, line int, ok bool) {9 pc, file, line, ok := runtime.Caller(1)10 f := runtime.FuncForPC(pc)11 return file, f.Name(), line, ok12 }1314 func myFunc () {15 fmt.Println(Trace())16 }1718 func main() {19 fmt.Println(Trace())20 myFunc()21 }
output:
/prog.go main.main 19 true/prog.go main.myFunc 15 true
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