support lang tag on a vhost basis

config.yaml.sample

@@ -19,6 +19,7 @@ localhost:
                 Trusted:
                         - /private
                 Whitelist: "whitelist" 
+	Lang: "en,eo"
 localhost2:
         Hostname: "gemini.foo.bar"
         RootDir: "/var/gemini2"

src/gemini.go

@@ -62,6 +62,7 @@ type GeminiConfig struct {
 	RootDir       string
 	CGIDir        string
 	AccessControl CapsuleAcl
+	Lang          string
 }
 
 type CapsuleAcl struct {
@@ -75,12 +76,13 @@ func (c *GeminiConfig) String() string {
 	return fmt.Sprintf("Gemini Config: %v Files:%v CGI:%v", c.Hostname, c.RootDir, c.CGIDir)
 }
 
-func generateFile(selector string) Response {
+func generateFile(selector, extended_meta string) Response {
 	meta := mime.TypeByExtension(filepath.Ext(selector))
 	if meta == "" {
 		//assume plain UTF-8 text
 		meta = "text/gemini; charset=utf-8"
 	}
+	meta = meta + "; " + extended_meta
 	file, err := os.Open(selector)
 	if err != nil {
 		panic("Failed to read file")
@@ -90,7 +92,7 @@ func generateFile(selector string) Response {
 	return Response{STATUS_SUCCESS, meta, string(buf)}
 }
 
-func generateDirectory(path string) Response {
+func generateDirectory(path, extended_meta string) Response {
 	var dirpage string
 	files, err := ioutil.ReadDir(path)
 	if err != nil {
@@ -105,12 +107,16 @@ func generateDirectory(path string) Response {
 		}
 		if file.Name() == "index.gmi" || file.Name() == "index.gemini" {
 			//Found an index file, return that instead
-			return generateFile(path + file.Name())
+			return generateFile(path+file.Name(), extended_meta)
 		} else {
 			dirpage += fmt.Sprintf("=> %s %s\r\n", url.PathEscape(file.Name()), file.Name())
 		}
 	}
-	return Response{STATUS_SUCCESS, "text/gemini", dirpage}
+	meta := "text/gemini"
+	if extended_meta != "" {
+		meta = meta + "; " + extended_meta
+	}
+	return Response{STATUS_SUCCESS, meta, dirpage}
 }
 
 func generateCGI(selector *url.URL, c *conn) Response {

src/server.go

@@ -224,7 +224,12 @@ func (s *Server) ParseRequest(req string, c *conn) Response {
 		return Response{STATUS_TEMPORARY_FAILURE, "Unable to access file", ""}
 	case fi.IsDir():
 		if strings.HasSuffix(u.Path, "/") {
-			return generateDirectory(selector)
+			//build extended meta first
+			ext := ""
+			if capsule.Lang != "" {
+				ext = "lang=" + capsule.Lang
+			}
+			return generateDirectory(selector, ext)
 		} else {
 			return Response{STATUS_REDIRECT_PERMANENT, "gemini://" + u.Hostname() + u.Path + "/", ""}
 		}
@@ -236,7 +241,12 @@ func (s *Server) ParseRequest(req string, c *conn) Response {
 			return generateCGI(u, c)
 		} else {
 			//Normal file found
-			return generateFile(selector)
+			//build extended meta first
+			ext := ""
+			if capsule.Lang != "" {
+				ext = "lang=" + capsule.Lang
+			}
+			return generateFile(selector, ext)
 		}
 	}
 }