92 lines
2.9 KiB
Go
92 lines
2.9 KiB
Go
package appdata
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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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// GetDataDir returns an operating system specific directory to be used for
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// storing application data for an application.
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func GetDataDir(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 if
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// 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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var usr *user.User
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var e error
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if usr, e = user.Current(); e == 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 for most POSIX
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// OSes if the directory from the Go standard lib failed.
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if e != 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 to
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// 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(
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homeDir, "Library",
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"Application Support", appNameUpper,
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)
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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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// Dir returns an operating system specific directory to be used for storing
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// application data for an application. The appName parameter is the name of the
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// application the data directory is being requested for. This function will
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// prepend a period to the appName for POSIX style operating systems since that
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// is standard practice.
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//
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// An empty appName or one with a single dot is treated as requesting the
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// current 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. Example results:
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//
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// dir := Dir("myapp", false)
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//
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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 Dir(appName string, roaming bool) string {
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return GetDataDir(runtime.GOOS, appName, roaming)
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}
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