Merge pull request #13 from urbanopt/fix/trailing-comments

fix(modelicafmt): add comments trailing at end of file

examples/gmt-building-out.mo

@@ -187,3 +187,4 @@ First implementation.
 </ul>
 </html>"));
 end building;
+/* trailing comment */

examples/gmt-building.mo

@@ -221,4 +221,5 @@ First implementation.
 </li>
 </ul>
 </html>"));
-end building;
+end building;
+/* trailing comment */

modelicafmt.go

@@ -423,5 +423,13 @@ func processFile(filename string, out io.Writer) error {
 	defer listener.close()
 
 	antlr.ParseTreeWalkerDefault.Walk(listener, sd)
+	// add any remaining comments and handle newline at end of file
+	for _, comment := range listener.commentTokens {
+		listener.writeComment(comment)
+	}
+	if !listener.onNewLine {
+		listener.writeNewline()
+	}
+
 	return nil
 }