How Can I Get the Source Code File Name and Line Number in Go?

Retrieving Source Code File Name and Line Number in Go

In programming languages like C/C , developers can leverage FILE and LINE to obtain the current source code file path and line number. Does Go offer a similar functionality?

Answer:

Absolutely. Go provides a built-in function called runtime.Caller to access the source code file name and line number of the current function.

Implementation:

To utilize runtime.Caller, you can call it with an optional integer argument:

func GetSourceInfo(skip int) (string, int) {
    _, thisFile, thisLine, ok := runtime.Caller(skip)
    if !ok {
        return "", 0
    }
    return thisFile, thisLine
}

The skip parameter specifies how many layers up the call stack to ascend. For instance, skip=0 would return the source info for the current function, skip=1 would return the source info for the caller of the current function, and so on.

Example Usage:

import (
    "fmt"
    "runtime"
)

func main() {
    file, line := GetSourceInfo(1)
    fmt.Println("Calling function:", file, line)
}

Output:

Calling function: /path/to/my/file.go 12

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