re-implemented dia-conversion

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

files/src/main/java/de/srsoftware/umbrella/files/FileModule.java

@@ -10,6 +10,7 @@ import static de.srsoftware.umbrella.core.constants.Text.LONG;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.*;
 import static de.srsoftware.umbrella.core.model.Translatable.t;
 import static de.srsoftware.umbrella.files.Constants.*;
+import static java.lang.System.Logger.Level.WARNING;
 import static java.net.HttpURLConnection.HTTP_OK;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.text.MessageFormat.format;
@@ -54,6 +55,18 @@ public class FileModule extends BaseHandler implements FileService {
 		ModuleRegistry.add(this);
 	}
 
+	private void convertDia(File source) {
+		if (!new File("/usr/bin/dia").exists()) return;
+		var dest = source+".svg";
+		String[] command = {"dia","-e",dest,source.toString()};
+		try {
+			Runtime.getRuntime().exec(command);
+		} catch (IOException e) {
+			LOG.log(WARNING,"Failed to convert {} to SVG file",source,e);
+		}
+
+	}
+
 	@Override
 	public boolean doDelete(de.srsoftware.tools.Path path, HttpExchange ex) throws IOException {
 		addCors(ex);
@@ -200,6 +213,7 @@ public class FileModule extends BaseHandler implements FileService {
 			body.transferTo(out);
 			body.close();
 			out.close();
+			if (filename.toLowerCase().endsWith(".dia")) convertDia(file);
 		} else {
 			if (file.exists()) throw unprocessable("{file} already exists!",FILE, filename);
 			try {