Merge pull request #991 from rsteube/xdg-configdirs

xdg: global config dirs

pkg/xdg/xdg.go

@@ -1,11 +1,14 @@
 package xdg
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
+	"runtime"
+	"strings"
 )
 
-// UserCacheDir returns the cache base directory.
+// UserCacheDir returns the user cache base directory.
 func UserCacheDir() (dir string, err error) {
 	if dir = os.Getenv("XDG_CACHE_HOME"); dir == "" {
 		dir, err = os.UserCacheDir()
@@ -14,11 +17,38 @@ func UserCacheDir() (dir string, err error) {
 	return
 }
 
-// UserConfigDir returns the config base directory.
+// UserConfigDir returns the user config base directory.
 func UserConfigDir() (dir string, err error) {
 	if dir = os.Getenv("XDG_CONFIG_HOME"); dir == "" {
 		dir, err = os.UserConfigDir()
 	}
 	dir = filepath.ToSlash(dir)
 	return
 }
+
+// ConfigDirs returns the global config base directories.
+func ConfigDirs() (dirs []string, err error) {
+	switch runtime.GOOS {
+	case "windows":
+		dir, ok := os.LookupEnv("PROGRAMDATA")
+		if !ok {
+			return nil, errors.New("missing PROGRAMDATA environment variable")
+		}
+		dirs = append(dirs, dir)
+
+	case "darwin":
+		dirs = append(dirs, "/Library/Application Support")
+	default:
+		dirs = append(dirs, "/etc/xdg")
+
+	}
+
+	if v, ok := os.LookupEnv("XDG_CONFIG_DIRS"); ok {
+		dirs = append(strings.Split(v, string(os.PathSeparator)), dirs...)
+	}
+
+	for index, dir := range dirs {
+		dirs[index] = filepath.ToSlash(dir)
+	}
+	return
+}