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// Copyright 2016 (C) Mitchell Hashimoto
// Distributed under the MIT License.
// Package homedir implements a portable function to determine current user's homedir.
package homedir
import (
"errors"
"path/filepath"
"sync"
)
// DisableCache will disable caching of the home directory. Caching is enabled
// by default.
var DisableCache bool
var homedirCache string
var cacheLock sync.Mutex
// Dir returns the home directory for the executing user.
//
// This uses an OS-specific method for discovering the home directory.
// An error is returned if a home directory cannot be detected.
func Dir() (string, error) {
cacheLock.Lock()
defer cacheLock.Unlock()
// Return cached homedir if available.
if !DisableCache {
if homedirCache != "" {
return homedirCache, nil
}
}
// Determine OS speific current homedir.
result, err := dir()
if err != nil {
return "", err
}
// Cache for future lookups.
homedirCache = result
return result, nil
}
// Expand expands the path to include the home directory if the path
// is prefixed with `~`. If it isn't prefixed with `~`, the path is
// returned as-is.
func Expand(path string) (string, error) {
if len(path) == 0 {
return path, nil
}
if path[0] != '~' {
return path, nil
}
if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
return "", errors.New("cannot expand user-specific home dir")
}
dir, err := Dir()
if err != nil {
return "", err
}
return filepath.Join(dir, path[1:]), nil
}
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