func someFunc() {
    //...
    if errlog.Debug(err) { // will debug & pass if err != nil, will ignore if err == nil
        return
    }
}

type Config struct {
    PrintFunc          func(format string, data ...interface{}) //Printer func (eg: fmt.Printf)
    LinesBefore        int  //How many lines to print *before* the error line when printing source code
    LinesAfter         int  //How many lines to print *after* the error line when printing source code
    PrintStack         bool //Shall we print stack trace ? yes/no
    PrintSource        bool //Shall we print source code along ? yes/no
    PrintError         bool //Shall we print the error of Debug(err) ? yes/no
    ExitOnDebugSuccess bool //Shall we os.Exit(1) after Debug has finished logging everything ? (doesn't happen when err is nil). Will soon be replaced by ExitFunc to enable panic-ing the current goroutine. (if you need this quick, please open an issue)
}

func main() {
    fmt.Println("Program start")

    wrapingFunc() //call to our important function

    fmt.Println("Program end")
}

func wrapingFunc() {
    someBigFunction() // call some func 
}

func someBigFunction() {
    someDumbFunction() // just random calls
    someSmallFunction() // just random calls
    someDumbFunction() // just random calls

    // Here it can fail, so instead of `if err  != nil` we use `errlog.Debug(err)`
    if err := someNastyFunction(); errlog.Debug(err) {
        return
    }

    someSmallFunction() // just random calls
    someDumbFunction() // just random calls
}

func someSmallFunction() {
    _ = fmt.Sprintf("I do things !")
}

func someNastyFunction() error {
    return errors.New("I'm failing for some reason") // simulate an error
}

func someDumbFunction() bool {
    return false // just random things
}

debug := errlog.NewLogger(&errlog.Config{
    // PrintFunc is of type `func (format string, data ...interface{})`
    // so you can easily implement your own logger func.
    // In this example, logrus is used, but any other logger can be used.
    // Beware that you should add '\n' at the end of format string when printing.
    PrintFunc:          logrus.Printf,
    PrintSource:        true, //Print the failing source code
    LinesBefore:        2, //Print 2 lines before failing line
    LinesAfter:         1, //Print 1 line after failing line
    PrintError:         true, //Print the error
    PrintStack:         false, //Don't print the stack trace
    ExitOnDebugSuccess: true, //Exit if err
})