Update, bugfixes on diff and edit handling

pkg/protocol/types.go

@@ -1,6 +1,8 @@
 // Package protocol defines shared types used across the MCP file operations server.
 package protocol
 
+import "path/filepath"
+
 // Location represents a position in a file.
 type Location struct {
 	File   string `json:"file"`
@@ -66,7 +68,7 @@ const (
 
 // DetectLanguage detects the language from a filename.
 func DetectLanguage(filename string) Language {
-	ext := getExtension(filename)
+	ext := filepath.Ext(filename)
 	switch ext {
 	case ".go":
 		return LangGo
@@ -94,15 +96,3 @@ func DetectLanguage(filename string) Language {
 		return LangUnknown
 	}
 }
-
-func getExtension(filename string) string {
-	for i := len(filename) - 1; i >= 0; i-- {
-		if filename[i] == '.' {
-			return filename[i:]
-		}
-		if filename[i] == '/' || filename[i] == '\\' {
-			break
-		}
-	}
-	return ""
-}

pkg/protocol/types_test.go

@@ -48,26 +48,3 @@ func TestDetectLanguage(t *testing.T) {
 		})
 	}
 }
-
-func TestGetExtension(t *testing.T) {
-	tests := []struct {
-		filename string
-		expected string
-	}{
-		{"file.go", ".go"},
-		{"file.test.go", ".go"},
-		{"path/to/file.ts", ".ts"},
-		{"noextension", ""},
-		{".hidden", ".hidden"},
-		{"file.", "."},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.filename, func(t *testing.T) {
-			result := getExtension(tt.filename)
-			if result != tt.expected {
-				t.Errorf("getExtension(%q) = %q, want %q", tt.filename, result, tt.expected)
-			}
-		})
-	}
-}