Add new AppDataDir function.
This commit adds a new AppDataDir function that can be used to get an
operating system and application specific directory to be used for storing
application data.
For example:
dir := AppDataDir("myapp", false)
Would result in:
POSIX (Linux/BSD): ~/.myapp
Mac OS: $HOME/Library/Application Support/Myapp
Windows: %LOCALAPPDATA%\Myapp
Plan 9: $home/myapp
This is work toward conformal/btcd#30.
This commit is contained in:
Dave Collins
parent
ccb6557298
commit
fcf9b83256
107
appdata.go
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107
appdata.go
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@ -0,0 +1,107 @@
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// Copyright (c) 2013 Conformal Systems LLC.
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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 stripping it.
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if strings.HasPrefix(appName, ".") {
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appName = appName[1:]
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}
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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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132
appdata_test.go
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132
appdata_test.go
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@ -0,0 +1,132 @@
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// Copyright (c) 2013 Conformal Systems LLC.
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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_test
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import (
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"github.com/conformal/btcutil"
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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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"testing"
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"unicode"
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)
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// TestAppDataDir tests the API for AppDataDir to ensure it gives expected
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// results for various operating systems.
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func TestAppDataDir(t *testing.T) {
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// App name plus upper and lowercase variants.
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appName := "myapp"
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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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// When we're on Windows, set the expected local and roaming directories
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// per the environment vars. When we aren't on Windows, the function
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// should return the current directory when forced to provide the
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// Windows path since the environment variables won't exist.
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winLocal := "."
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winRoaming := "."
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if runtime.GOOS == "windows" {
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localAppData := os.Getenv("LOCALAPPDATA")
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roamingAppData := os.Getenv("APPDATA")
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if localAppData == "" {
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localAppData = roamingAppData
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}
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winLocal = filepath.Join(localAppData, appNameUpper)
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winRoaming = filepath.Join(roamingAppData, appNameUpper)
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}
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// Get the home directory to use for testing expected results.
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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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t.Errorf("user.Current: %v", err)
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return
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}
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homeDir = usr.HomeDir
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// Mac app data directory.
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macAppData := filepath.Join(homeDir, "Library", "Application Support")
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tests := []struct {
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goos string
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appName string
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roaming bool
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want string
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}{
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// Various combinations of application name casing, leading
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// period, operating system, and roaming flags.
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{"windows", appNameLower, false, winLocal},
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{"windows", appNameUpper, false, winLocal},
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{"windows", "." + appNameLower, false, winLocal},
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{"windows", "." + appNameUpper, false, winLocal},
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{"windows", appNameLower, true, winRoaming},
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{"windows", appNameUpper, true, winRoaming},
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{"windows", "." + appNameLower, true, winRoaming},
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{"windows", "." + appNameUpper, true, winRoaming},
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{"linux", appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"linux", appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"linux", "." + appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"linux", "." + appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"darwin", appNameLower, false, filepath.Join(macAppData, appNameUpper)},
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{"darwin", appNameUpper, false, filepath.Join(macAppData, appNameUpper)},
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{"darwin", "." + appNameLower, false, filepath.Join(macAppData, appNameUpper)},
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{"darwin", "." + appNameUpper, false, filepath.Join(macAppData, appNameUpper)},
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{"openbsd", appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"openbsd", appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"openbsd", "." + appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"openbsd", "." + appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"freebsd", appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"freebsd", appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"freebsd", "." + appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"freebsd", "." + appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"netbsd", appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"netbsd", appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"netbsd", "." + appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"netbsd", "." + appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"plan9", appNameLower, false, filepath.Join(homeDir, appNameLower)},
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{"plan9", appNameUpper, false, filepath.Join(homeDir, appNameLower)},
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{"plan9", "." + appNameLower, false, filepath.Join(homeDir, appNameLower)},
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{"plan9", "." + appNameUpper, false, filepath.Join(homeDir, appNameLower)},
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{"unrecognized", appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"unrecognized", appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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{"unrecognized", "." + appNameLower, false, filepath.Join(homeDir, "."+appNameLower)},
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{"unrecognized", "." + appNameUpper, false, filepath.Join(homeDir, "."+appNameLower)},
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// No application name provided, so expect current directory.
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{"windows", "", false, "."},
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{"windows", "", true, "."},
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{"linux", "", false, "."},
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{"darwin", "", false, "."},
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{"openbsd", "", false, "."},
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{"freebsd", "", false, "."},
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{"netbsd", "", false, "."},
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{"plan9", "", false, "."},
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{"unrecognized", "", false, "."},
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// Single dot provided for application name, so expect current
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// directory.
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{"windows", ".", false, "."},
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{"windows", ".", true, "."},
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{"linux", ".", false, "."},
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{"darwin", ".", false, "."},
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{"openbsd", ".", false, "."},
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{"freebsd", ".", false, "."},
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{"netbsd", ".", false, "."},
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{"plan9", ".", false, "."},
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{"unrecognized", ".", false, "."},
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}
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t.Logf("Running %d tests", len(tests))
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for i, test := range tests {
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ret := btcutil.TstAppDataDir(test.goos, test.appName, test.roaming)
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if ret != test.want {
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t.Errorf("appDataDir #%d (%s) does not match - "+
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"expected got %s, want %s", i, test.goos, ret,
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test.want)
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continue
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}
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}
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}
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@ -17,3 +17,9 @@ package btcutil
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func (b *Block) SetBlockBytes(buf []byte) {
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b.serializedBlock = buf
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}
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// TstAppDataDir makes the internal appDataDir function available to the test
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// package.
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func TstAppDataDir(goos, appName string, roaming bool) string {
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return appDataDir(goos, appName, roaming)
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}
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