Add system dirs to path.go

path.go

@@ -10,12 +10,27 @@ func ApplicationUserDataDir (app ApplicationDescription) (string, error) {
 	return userMkdirAll(app.ID, userDataDir)
 }
 
+// ApplicationSystemDataDirs returns a list of directory paths where an
+// application can look for its system-level data files. These directories may
+// or may not exist. This function may return an empty slice on some platforms.
+func ApplicationSystemDataDirs (app ApplicationDescription) ([]string, error) {
+	return systemDirs(app.ID, systemDataDirs)
+}
+
 // ApplicationUserConfigDir returns the directory path where an application can
 // store its user configuration files.
 func ApplicationUserConfigDir (app ApplicationDescription) (string, error) {
 	return userMkdirAll(app.ID, userConfigDir)
 }
 
+// ApplicationSystemDataDirs returns a list of directory paths where an
+// application can look for its system-level configuration files. These
+// directories may or may not exist. This function may return an empty slice on
+// some platforms.
+func ApplicationSystemConfigDirs (app ApplicationDescription) ([]string, error) {
+	return systemDirs(app.ID, systemConfigDirs)
+}
+
 // ApplicationUserCacheDir returns the directory path where an application can
 // store its user cache files.
 func ApplicationUserCacheDir (app ApplicationDescription) (string, error) {
@@ -30,3 +45,13 @@ func userMkdirAll (sub string, getter func () (string, error)) (string, error) {
 	if err != nil { return "", err }
 	return path, nil
 }
+
+func systemDirs (sub string, getter func () ([]string, error)) ([]string, error) {
+	paths, err := getter()
+	if err != nil { return nil, err }
+	specificPaths := make([]string, len(paths))
+	for index, path := range paths {
+		specificPaths[index] = filepath.Join(path, sub)
+	}
+	return specificPaths, nil
+}

path_unix.go

@@ -7,10 +7,18 @@ func userDataDir () (string, error) {
 	return basedir.DataHome()
 }
 
+func systemDataDirs () ([]string, error) {
+	return basedir.DataDirs()
+}
+
 func userConfigDir () (string, error) {
 	return basedir.ConfigHome()
 }
 
+func systemConfigDirs () ([]string, error) {
+	return basedir.ConfigDirs()
+}
+
 func userCacheDir () (string, error) {
 	return basedir.CacheHome()
 }