From 3246944e541652f2e1316904d690e726a17e620d Mon Sep 17 00:00:00 2001
From: juk0de <git@kadidlo.de>
Date: Fri, 29 Sep 2023 06:59:46 +0200
Subject: [PATCH] hist_cmd: implemented '--convert' option

---
 chatmastermind/commands/hist.py | 51 +++++++++++++++++++++++++++++++--
 chatmastermind/main.py          |  9 ++++--
 2 files changed, 54 insertions(+), 6 deletions(-)

diff --git a/chatmastermind/commands/hist.py b/chatmastermind/commands/hist.py
index 5b14bd2..ab1462d 100644
--- a/chatmastermind/commands/hist.py
+++ b/chatmastermind/commands/hist.py
@@ -1,13 +1,48 @@
+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
+
+
+def convert_messages(args: argparse.Namespace, config: Config) -> None:
     """
-    Handler for the 'hist' command.
+    Convert messages to a new format. Also used to change the suffix,
+    to the latest default message file suffix.
+    """
+    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)
+    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 suffix
+    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 +56,13 @@ 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)
diff --git a/chatmastermind/main.py b/chatmastermind/main.py
index ac4f7cc..a803d0e 100755
--- a/chatmastermind/main.py
+++ b/chatmastermind/main.py
@@ -73,17 +73,20 @@ def create_parser() -> argparse.ArgumentParser:
 
     # 'hist' command parser
     hist_cmd_parser = cmdparser.add_parser('hist', parents=[tag_parser],
-                                           help="Print chat history.",
+                                           help="Print and manage chat history.",
                                            aliases=['h'])
     hist_cmd_parser.set_defaults(func=hist_cmd)
+    hist_group = hist_cmd_parser.add_mutually_exclusive_group(required=True)
+    hist_group.add_argument('-p', '--print', help='Print the DB chat history', action='store_true')
+    hist_group.add_argument('-c', '--convert', help='Convert all message files to the given format [txt|yaml]', metavar='FORMAT')
     hist_cmd_parser.add_argument('-w', '--with-tags', help="Print chat history with tags.",
                                  action='store_true')
     hist_cmd_parser.add_argument('-W', '--with-files', help="Print chat history with filenames.",
                                  action='store_true')
     hist_cmd_parser.add_argument('-S', '--source-code-only', help='Only print embedded source code',
                                  action='store_true')
-    hist_cmd_parser.add_argument('-A', '--answer', help='Search for answer substring', metavar='SUBSTRING')
-    hist_cmd_parser.add_argument('-Q', '--question', help='Search for question substring', metavar='SUBSTRING')
+    hist_cmd_parser.add_argument('-A', '--answer', help='Print only answers with given substring', metavar='SUBSTRING')
+    hist_cmd_parser.add_argument('-Q', '--question', help='Print only questions with given substring', metavar='SUBSTRING')
 
     # 'tags' command parser
     tags_cmd_parser = cmdparser.add_parser('tags',