106 lines
3.3 KiB
Go
106 lines
3.3 KiB
Go
// Copyright (c) 2013-2017 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcutil
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import (
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"os"
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"os/user"
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"path/filepath"
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"runtime"
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"strings"
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"unicode"
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)
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// appDataDir returns an operating system specific directory to be used for
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// storing application data for an application. See AppDataDir for more
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// details. This unexported version takes an operating system argument
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// primarily to enable the testing package to properly test the function by
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// forcing an operating system that is not the currently one.
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func appDataDir(goos, appName string, roaming bool) string {
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if appName == "" || appName == "." {
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return "."
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}
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// The caller really shouldn't prepend the appName with a period, but
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// if they do, handle it gracefully by trimming it.
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appName = strings.TrimPrefix(appName, ".")
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appNameUpper := string(unicode.ToUpper(rune(appName[0]))) + appName[1:]
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appNameLower := string(unicode.ToLower(rune(appName[0]))) + appName[1:]
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// Get the OS specific home directory via the Go standard lib.
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var homeDir string
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usr, err := user.Current()
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if err == nil {
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homeDir = usr.HomeDir
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}
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// Fall back to standard HOME environment variable that works
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// for most POSIX OSes if the directory from the Go standard
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// lib failed.
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if err != nil || homeDir == "" {
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homeDir = os.Getenv("HOME")
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}
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switch goos {
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// Attempt to use the LOCALAPPDATA or APPDATA environment variable on
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// Windows.
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case "windows":
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// Windows XP and before didn't have a LOCALAPPDATA, so fallback
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// to regular APPDATA when LOCALAPPDATA is not set.
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appData := os.Getenv("LOCALAPPDATA")
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if roaming || appData == "" {
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appData = os.Getenv("APPDATA")
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}
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if appData != "" {
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return filepath.Join(appData, appNameUpper)
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}
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case "darwin":
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if homeDir != "" {
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return filepath.Join(homeDir, "Library",
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"Application Support", appNameUpper)
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}
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case "plan9":
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if homeDir != "" {
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return filepath.Join(homeDir, appNameLower)
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}
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default:
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if homeDir != "" {
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return filepath.Join(homeDir, "."+appNameLower)
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}
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}
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// Fall back to the current directory if all else fails.
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return "."
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}
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// AppDataDir returns an operating system specific directory to be used for
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// storing application data for an application.
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//
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// The appName parameter is the name of the application the data directory is
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// being requested for. This function will prepend a period to the appName for
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// POSIX style operating systems since that is standard practice. An empty
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// appName or one with a single dot is treated as requesting the current
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// directory so only "." will be returned. Further, the first character
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// of appName will be made lowercase for POSIX style operating systems and
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// uppercase for Mac and Windows since that is standard practice.
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//
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// The roaming parameter only applies to Windows where it specifies the roaming
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// application data profile (%APPDATA%) should be used instead of the local one
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// (%LOCALAPPDATA%) that is used by default.
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//
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// Example results:
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// dir := AppDataDir("myapp", false)
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// POSIX (Linux/BSD): ~/.myapp
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// Mac OS: $HOME/Library/Application Support/Myapp
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// Windows: %LOCALAPPDATA%\Myapp
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// Plan 9: $home/myapp
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func AppDataDir(appName string, roaming bool) string {
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return appDataDir(runtime.GOOS, appName, roaming)
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}
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