print_cmd: added option to print latest message

chatmastermind/commands/print.py

@@ -3,25 +3,43 @@ import argparse
 from pathlib import Path
 from ..configuration import Config
 from ..message import Message, MessageError
+from ..chat import ChatDB
+
+
+def print_message(message: Message, args: argparse.Namespace) -> None:
+    """
+    Print given message according to give arguments.
+    """
+    if args.question:
+        print(message.question)
+    elif args.answer:
+        print(message.answer)
+    elif message.answer and args.only_source_code:
+        for code in message.answer.source_code():
+            print(code)
+    else:
+        print(message.to_str())
 
 
 def print_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'print' command.
     """
-    fname = Path(args.file)
-    try:
-        message = Message.from_file(fname)
-        if message:
-            if args.question:
-                print(message.question)
-            elif args.answer:
-                print(message.answer)
-            elif message.answer and args.only_source_code:
-                for code in message.answer.source_code():
-                    print(code)
-            else:
-                print(message.to_str())
-    except MessageError:
-        print(f"File is not a valid message: {args.file}")
-        sys.exit(1)
+    # print given file
+    if args.file is not None:
+        fname = Path(args.file)
+        try:
+            message = Message.from_file(fname)
+            if message:
+                print_message(message, args)
+        except MessageError:
+            print(f"File is not a valid message: {args.file}")
+            sys.exit(1)
+    # print latest message
+    elif args.latest:
+        chat = ChatDB.from_dir(Path(config.cache), Path(config.db))
+        latest = chat.msg_latest(loc='disk')
+        if not latest:
+            print("No message found!")
+            sys.exit(1)
+        print_message(latest, args)

chatmastermind/main.py

@@ -114,7 +114,9 @@ def create_parser() -> argparse.ArgumentParser:
                                             help="Print message files.",
                                             aliases=['p'])
     print_cmd_parser.set_defaults(func=print_cmd)
-    print_cmd_parser.add_argument('-f', '--file', help='Print given message file', required=True, metavar='FILE')
+    print_group = print_cmd_parser.add_mutually_exclusive_group(required=True)
+    print_group.add_argument('-f', '--file', help='Print given message file', metavar='FILE')
+    print_group.add_argument('-l', '--latest', help='Print latest message', action='store_true')
     print_cmd_modes = print_cmd_parser.add_mutually_exclusive_group()
     print_cmd_modes.add_argument('-q', '--question', help='Only print the question', action='store_true')
     print_cmd_modes.add_argument('-a', '--answer', help='Only print the answer', action='store_true')