feat: doctor command

core/internal/utils/paths.go

@@ -6,6 +6,30 @@ import (
 	"strings"
 )
 
+func xdgDir(envVar string, defaultPath ...string) string {
+	if dir := os.Getenv(envVar); dir != "" {
+		return dir
+	}
+	home, _ := os.UserHomeDir()
+	return filepath.Join(append([]string{home}, defaultPath...)...)
+}
+
+func XDGConfigHome() string {
+	return xdgDir("XDG_CONFIG_HOME", ".config")
+}
+
+func XDGStateHome() string {
+	return xdgDir("XDG_STATE_HOME", ".local", "state")
+}
+
+func XDGCacheHome() string {
+	return xdgDir("XDG_CACHE_HOME", ".cache")
+}
+
+func XDGDataHome() string {
+	return xdgDir("XDG_DATA_HOME", ".local", "share")
+}
+
 func ExpandPath(path string) (string, error) {
 	expanded := os.ExpandEnv(path)
 	expanded = filepath.Clean(expanded)