os_1.11.go

// +build !go1.12

package main

import (
	"errors"
	"os"
	"runtime"
)

// UserHomeDir was introduced in Go 1.12. When we drop support for Go 1.11, we can
// lose this file.

// UserHomeDir returns the current user's home directory.
//
// On Unix, including macOS, it returns the $HOME environment variable.
// On Windows, it returns %USERPROFILE%.
// On Plan 9, it returns the $home environment variable.
func UserHomeDir() (string, error) {
	env, enverr := "HOME", "$HOME"
	switch runtime.GOOS {
	case "windows":
		env, enverr = "USERPROFILE", "%userprofile%"
	case "plan9":
		env, enverr = "home", "$home"
	case "nacl", "android":
		return "/", nil
	case "darwin":
		if runtime.GOARCH == "arm" || runtime.GOARCH == "arm64" {
			return "/", nil
		}
	}
	if v := os.Getenv(env); v != "" {
		return v, nil
	}
	return "", errors.New(enverr + " is not defined")
}