Implement route rules

constant/path.go

@@ -0,0 +1,35 @@
+package constant
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/sagernet/sing/common/rw"
+)
+
+const dirName = "sing-box"
+
+var resourcePaths []string
+
+func Find(name string) (string, bool) {
+	name = os.ExpandEnv(name)
+	if rw.FileExists(name) {
+		return name, true
+	}
+	for _, dir := range resourcePaths {
+		if path := filepath.Join(dir, dirName, name); rw.FileExists(path) {
+			return path, true
+		}
+	}
+	return name, false
+}
+
+func init() {
+	resourcePaths = append(resourcePaths, ".")
+	if userConfigDir, err := os.UserConfigDir(); err == nil {
+		resourcePaths = append(resourcePaths, userConfigDir)
+	}
+	if userCacheDir, err := os.UserCacheDir(); err == nil {
+		resourcePaths = append(resourcePaths, userCacheDir)
+	}
+}