core: add slices, paths, exec utils

core/internal/utils/paths.go

@@ -0,0 +1,52 @@
+package utils
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func ExpandPath(path string) (string, error) {
+	expanded := os.ExpandEnv(path)
+	expanded = filepath.Clean(expanded)
+
+	if strings.HasPrefix(expanded, "~") {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return "", err
+		}
+		expanded = filepath.Join(home, expanded[1:])
+	}
+
+	return expanded, nil
+}
+
+func XDGConfigHome() string {
+	if configHome := os.Getenv("XDG_CONFIG_HOME"); configHome != "" {
+		return configHome
+	}
+	if home, err := os.UserHomeDir(); err == nil {
+		return filepath.Join(home, ".config")
+	}
+	return filepath.Join(os.TempDir(), ".config")
+}
+
+func XDGCacheHome() string {
+	if cacheHome := os.Getenv("XDG_CACHE_HOME"); cacheHome != "" {
+		return cacheHome
+	}
+	if home, err := os.UserHomeDir(); err == nil {
+		return filepath.Join(home, ".cache")
+	}
+	return filepath.Join(os.TempDir(), ".cache")
+}
+
+func XDGDataHome() string {
+	if dataHome := os.Getenv("XDG_DATA_HOME"); dataHome != "" {
+		return dataHome
+	}
+	if home, err := os.UserHomeDir(); err == nil {
+		return filepath.Join(home, ".local", "share")
+	}
+	return filepath.Join(os.TempDir(), ".local", "share")
+}