utils.go

package utils

import (
	"fmt"
	"io"
	"os"
	"path/filepath"
	"runtime"
	"strings"

	"github.com/mitchellh/go-homedir"
)

func GetHomeFolder() string {
	home, _ := homedir.Dir()
	// we set the path separator to "/" even for windows, as go runtime can recognize it
	if runtime.GOOS == "windows" {
		home = strings.ReplaceAll(home, "\\", "/")
	}
	return home
}

func FileExists(path string) bool {
	info, err := os.Stat(path)

	if os.IsNotExist(err) {
		return false
	} else if err == nil {
		return !info.IsDir()
	}

	return false
}

// DirExists checks whether a directory exists
func DirExists(path string) bool {
	info, err := os.Stat(path)

	if os.IsNotExist(err) {
		return false
	} else if err == nil {
		return info.IsDir()
	}

	return false
}

func Copy(srcFile, dstFile string) error {
	out, err := os.Create(dstFile)
	if err != nil {
		return err
	}

	defer out.Close()

	in, err := os.Open(srcFile)
	defer in.Close()
	if err != nil {
		return err
	}

	_, err = io.Copy(out, in)
	if err != nil {
		return err
	}

	return nil
}

func Exists(filePath string) bool {
	if _, err := os.Stat(filePath); os.IsNotExist(err) {
		return false
	}

	return true
}

func CreateIfNotExists(dir string, perm os.FileMode) error {
	if Exists(dir) {
		return nil
	}

	if err := os.MkdirAll(dir, perm); err != nil {
		return fmt.Errorf("failed to create directory: '%s', error: '%s'", dir, err.Error())
	}

	return nil
}

func CopySymLink(source, dest string) error {
	link, err := os.Readlink(source)
	if err != nil {
		return err
	}
	return os.Symlink(link, dest)
}

func DeleteDirectory(dir string) error {
	d, err := os.Open(dir)
	if err != nil {
		return err
	}
	defer d.Close()

	names, err := d.Readdirnames(-1)
	if err != nil {
		return err
	}

	for _, name := range names {
		err = os.RemoveAll(filepath.Join(dir, name))
		if err != nil {
			return err
		}
	}
	return os.RemoveAll(dir)
}