package ...

import (
    ...
    "github.com/alexcoder04/friendly/v2"
    "github.com/alexcoder04/friendly/v2/ffiles"
)

...
folder, _ := friendly.Input()
if ffiles.IsDir(folder) {
    friendly.CompressFolder(folder, destination)
}
...

// exist
func Exists(path string) (bool, error) { } // returns true error when cannot stat file (and error is not os.ErrNotExists)
func IsDir(path string) bool { } // true only when file exists and IS a directory
func IsFile(path string) bool { } // true only when file exists and is NOT a directory

// read-write
func ListFilesRecursively(folder string) ([]string, error) { }
func ReadLines(file string) ([]string, error) { }
func WriteLines(file string, lines []string) error { }
func WriteNewFile(file string, content string) error { }

// copy
func CopyFile(source string, destin string) error { }
func CopyFolder(source string, destination string) error { }

// locations
func GetConfigDirFor(program string) (string, error) { } // creates the directory if it doesn't exist
func GetCacheDirFor(program string) (string, error) { } // creates the directory if it doesn't exist
func GetLogDirFor(program string) (string, error) { } // creates the directory if it doesn't exist
func GetRuntimeDir() string { } // creates the directory if it doesn't exist

// desktop
func GetDisplayServer() string { }
func GuiRunning() bool { }