hist_cmd: implemented '--convert' option

chatmastermind/commands/hist.py

@@ -1,13 +1,53 @@
+import sys
 import argparse
 from pathlib import Path
 from ..configuration import Config
 from ..chat import ChatDB
-from ..message import MessageFilter
+from ..message import MessageFilter, Message
 
 
-def hist_cmd(args: argparse.Namespace, config: Config) -> None:
+msg_suffix = Message.file_suffix_write  # currently '.msg'
+
+
+def convert_messages(args: argparse.Namespace, config: Config) -> None:
     """
-    Handler for the 'hist' command.
+    Convert messages to a new format. Also used to change old suffixes
+    ('.txt', '.yaml') to the latest default message file suffix ('.msg').
+    """
+    chat = ChatDB.from_dir(Path(config.cache),
+                           Path(config.db))
+    # read all known message files
+    msgs = chat.msg_gather(loc='disk', glob='*.*')
+    # make a set of all message IDs
+    msg_ids = set([m.msg_id() for m in msgs])
+    # set requested format and write all messages
+    chat.set_msg_format(args.convert)
+    # delete the current suffix
+    # -> a new one will automatically be created
+    for m in msgs:
+        if m.file_path:
+            m.file_path = m.file_path.with_suffix('')
+    chat.msg_write(msgs)
+    # read all messages with the current default suffix
+    msgs = chat.msg_gather(loc='disk', glob='*{msg_suffix}')
+    # make sure we converted all of the original messages
+    for mid in msg_ids:
+        if not any(mid == m.msg_id() for m in msgs):
+            print(f"Message '{mid}' has not been found after conversion. Aborting.")
+            sys.exit(1)
+    # delete messages with old suffixes
+    msgs = chat.msg_gather(loc='disk', glob='*.*')
+    for m in msgs:
+        if m.file_path and m.file_path.suffix != msg_suffix:
+            m.rm_file()
+    print(f"Successfully converted {len(msg_ids)} messages.")
+    if len(msgs):
+        print(f"Deleted {len(msgs)} messages with deprecated suffixes.")
+
+
+def print_chat(args: argparse.Namespace, config: Config) -> None:
+    """
+    Print the DB chat history.
     """
 
     mfilter = MessageFilter(tags_or=args.or_tags,
@@ -21,3 +61,13 @@ def hist_cmd(args: argparse.Namespace, config: Config) -> None:
     chat.print(args.source_code_only,
                args.with_tags,
                args.with_files)
+
+
+def hist_cmd(args: argparse.Namespace, config: Config) -> None:
+    """
+    Handler for the 'hist' command.
+    """
+    if args.print:
+        print_chat(args, config)
+    elif args.convert:
+        convert_messages(args, config)