package main

import (
	"errors"
	"fmt"
	"os"
)

var commaSh = `#!/bin/sh

script_path=$(realpath $0)
script_dir=$(dirname $script_path)

cd $script_dir

output=/tmp/commandgo

# why not just using "go run ." ?
# Because "go run ." will inject GOBIN into PATH while compiling,
# and modifed PATH will pass into actual program.
# So the program doesn't have the same PATH as outside.
# It's not a acceptable behavior.

go build -o $output . && $output $@
`

func commandsUsage() string {
	return fmt.Sprintf(
		`commands:
  path        %v
`, commandPathDescription)
}

func main() {
	pwd, err := os.Getwd()
	if err != nil {
		panic(fmt.Errorf("detect current directory failed! %w", err))
	}
	target := pwd + string(os.PathSeparator) + ","
	_, err = os.Stat(target)
	if errors.Is(err, os.ErrNotExist) {
		err := os.WriteFile(target, []byte(commaSh), 0755)
		if err != nil {
			panic(fmt.Errorf("write sh failed: %w", err))
		}
	}
	if len(os.Args) >= 2 {
		switch os.Args[1] {
		case "path":
			commandPath(os.Args[1:])
		default:
			fmt.Printf("unknow command `%v`\n\n", os.Args[1])
			fmt.Printf("%v", commandsUsage())
			os.Exit(1)
		}
	} else {
		fmt.Println("Personal scripts set written in Golang\n")
		fmt.Printf("%v", commandsUsage())
	}

}