package main

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"path"
	"strings"

	"github.com/kardianos/osext"
)

func main() {
	// Find location of executable with kardianos/osext
	exeFolder, err := osext.ExecutableFolder()
	if err != nil {
		log.Fatal(err)
	}

	//
	// These will require that the executable is in a directory within the $PATH

	// Find location of executable with Args[0] and exec.LookPath
	// Requires import of os, os/exec, and path
	argZero := os.Args[0]
	exePath, err := exec.LookPath(argZero)
	if err != nil {
		log.Fatal(err)
	}
	lookPath := path.Dir(exePath)

	// Walk the path environment locally
	walkPath := pathWalker(os.Args[0])

	// Output to comapre the results
	fmt.Printf("osext.ExeFolder : %s\n", exeFolder)
	fmt.Printf("exec.LookPath   : %s\n", lookPath)
	fmt.Printf("local walkPath  : %s\n", walkPath)
}

func pathWalker(file string) string {
	path := os.Getenv("PATH")
	for _, dir := range strings.Split(path, ":") {
		exe := dir + "/" + file
		if _, err := os.Stat(exe); err == nil {
			return dir
		}
	}
	return "not found"
}