Fix: command without message error & default model logic

Signed-off-by: Daniel Hu <[email protected]>

src/main/java/ai/devchat/cli/DevChatWrapper.java

@@ -116,6 +116,7 @@ private void readOutputByLine(InputStream inputStream, Consumer<String> callback
 
     public void runPromptCommand(Map<String, List<String>> flags, String message, Consumer<String> callback) {
         try {
+            flags.put("model", Collections.singletonList(currentModel));
             List<String> commands = prepareCommand("prompt", flags, message);
             execCommand(commands, callback);
         } catch (Exception e) {

src/main/java/ai/devchat/devchat/handler/SendMessageRequestHandler.java

@@ -121,7 +121,9 @@ private String handleCommandAndInstruct(String message, Map<String, List<String>
         // Loop through the command names and check if message starts with it
         for (String command : commandNamesList) {
             if (message.startsWith("/" + command + " ")) {
-                message = message.substring(command.length() + 2); // +2 to take into account the '/' and the space ' '
+                if (message.length() > command.length() + 2) {
+                    message = message.substring(command.length() + 2); // +2 to take into account the '/' and the space ' '
+                }
                 runResult = devchatWrapper.runRunCommand(command, null);
                 break;
             }