buffer: Refactor UpdateRules()

Author: JoeKar

internal/buffer/buffer.go

@@ -781,6 +781,33 @@ func (b *Buffer) searchRuntimeHeader(ft string, syntaxFiles *[]syntaxFileBuffer,
 	return syntaxFile, header
 }
 
+// searchRuntimeSyntax search in the runtime syntax files
+func (b *Buffer) searchRuntimeSyntax(name string, header *highlight.Header) {
+	for _, f := range config.ListRuntimeFiles(config.RTSyntax) {
+		if f.Name() == name {
+			data, err := f.Data()
+			if err != nil {
+				screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
+				continue
+			}
+
+			file, err := highlight.ParseFile(data)
+			if err != nil {
+				screen.TermMessage("Error parsing syntax file " + f.Name() + ": " + err.Error())
+				continue
+			}
+
+			syndef, err := highlight.ParseDef(file, header)
+			if err != nil {
+				screen.TermMessage("Error parsing syntax file " + f.Name() + ": " + err.Error())
+				continue
+			}
+			b.SyntaxDef = syndef
+			break
+		}
+	}
+}
+
 // UpdateRules updates the syntax rules and filetype for this buffer
 // This is called when the colorscheme changes
 func (b *Buffer) UpdateRules() {
@@ -840,29 +867,7 @@ func (b *Buffer) UpdateRules() {
 
 	if syntaxFile != "" && !foundDef {
 		// we found a syntax file using a syntax header file
-		for _, f := range config.ListRuntimeFiles(config.RTSyntax) {
-			if f.Name() == syntaxFile {
-				data, err := f.Data()
-				if err != nil {
-					screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
-					continue
-				}
-
-				file, err := highlight.ParseFile(data)
-				if err != nil {
-					screen.TermMessage("Error parsing syntax file " + f.Name() + ": " + err.Error())
-					continue
-				}
-
-				syndef, err := highlight.ParseDef(file, header)
-				if err != nil {
-					screen.TermMessage("Error parsing syntax file " + f.Name() + ": " + err.Error())
-					continue
-				}
-				b.SyntaxDef = syndef
-				break
-			}
-		}
+		b.searchRuntimeSyntax(syntaxFile, header)
 	}
 
 	if b.SyntaxDef != nil && highlight.HasIncludes(b.SyntaxDef) {