Go – How to get name of current package in go

go

Is there a way to get on runtime the name of current package?

package main

import "fmt"

func main() {
    pkgName := {some magic here:)}
    fmt.Println(pkgName)
}

… and the result should be "main"

Right now I'm using constant like:

package main

import "fmt"
const (
    pkgName = "main"
)

func main() {
    fmt.Println(pkgName)
}

but I'm curious if you can avoid this

Best Solution

There is no runtime or reflect method or function that provides the functionality that you are looking for.

The closest thing I could find is:

package main

import (
    "azul3d.org/lmath.v1"
    "fmt"
    "reflect"
)

type Empty struct{}

func main() {
    fmt.Println(reflect.TypeOf(Empty{}).PkgPath())
    fmt.Println(reflect.TypeOf(lmath.Vec3{0, 0, 0}).PkgPath())
}

This would output:

main
azul3d.org/lmath.v1

You could also read the first line of the file and remove the "package" substring. (Not sure if it's the best idea)

package main

import (
    "bufio"
    "bytes"
    "fmt"
    "os"
)

func main() {
    file, err := os.Open("so.go")
    if err != nil {
        panic(err)
    }
    r := bufio.NewReader(file)
    line, _, err := r.ReadLine()
    if err != nil {
        panic(err)
    }
    packageName := bytes.TrimPrefix(line, []byte("package "))
    fmt.Println(string(packageName))
}
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