diff --git a/libpurple_to_markdown/__init__.py b/libpurple_to_markdown/__init__.py
index 54dc868..c95b1f6 100644
--- a/libpurple_to_markdown/__init__.py
+++ b/libpurple_to_markdown/__init__.py
@@ -1,15 +1,18 @@
 import dataclasses
-import re
 import datetime
-from pathlib import Path
-import bs4
 import logging
+import re
+from pathlib import Path
+
+import bs4
 
 from ._version import __version__
+
 __all__ = ['__version__']
 
 logger = logging.getLogger(__name__)
 
+
 @dataclasses.dataclass(frozen=True, order=True)
 class Message:
     sent_at: datetime.datetime
@@ -21,12 +24,18 @@ class Message:
         assert self.sender is not None
         assert self.text is not None
 
-def datetime_sent(chat_start: datetime.datetime, message_sent: datetime.time) -> datetime.datetime:
-    naive = datetime.datetime.combine(chat_start.date(), message_sent, chat_start.tzinfo)
+
+def datetime_sent(
+    chat_start: datetime.datetime, message_sent: datetime.time,
+) -> datetime.datetime:
+    naive = datetime.datetime.combine(
+        chat_start.date(), message_sent, chat_start.tzinfo,
+    )
     if chat_start.time() > message_sent:
         naive = naive - datetime.timedelta(days=1)
     return naive
 
+
 def parse_timestamp(c) -> datetime.time:
     timestamp_obj = c
     if c.font is not None:
@@ -34,9 +43,12 @@ def parse_timestamp(c) -> datetime.time:
     m = re.match(r'\((\d+):(\d+):(\d+)\)', timestamp_obj.get_text())
     return datetime.time(int(m.group(1)), int(m.group(2)), int(m.group(3)))
 
+
 def parse_messages_in_chat_file(path: Path) -> list[Message]:
     logger.info('Parsing %s', path)
-    chat_start = datetime.datetime.fromisoformat(path.stem.removesuffix('CEST').removesuffix('CET'))
+    chat_start = datetime.datetime.fromisoformat(
+        path.stem.removesuffix('CEST').removesuffix('CET'),
+    )
 
     with open(path) as f:
         soup = bs4.BeautifulSoup(f, 'lxml')
@@ -53,12 +65,12 @@ def parse_messages_in_chat_file(path: Path) -> list[Message]:
 
     if soup.p:
         logger.warning('File indicates error message?')
-        return [] # TODO
+        return []  # TODO
     else:
         loglines = soup.body.children
 
     for c in loglines:
-        if c.name in {'font','span'} and cur_sent_at is None:
+        if c.name in {'font', 'span'} and cur_sent_at is None:
             # Get timestamp
             cur_sent_at = datetime_sent(chat_start, parse_timestamp(c))
 
@@ -67,7 +79,7 @@ def parse_messages_in_chat_file(path: Path) -> list[Message]:
                 assert cur_sender is None
                 cur_sender = c.b.get_text().strip().removesuffix(':')
 
-        elif c.name in {None,'span','font'}:
+        elif c.name in {None, 'span', 'font'}:
             cur_text += c.get_text()
 
         elif c.name == 'a':
@@ -84,8 +96,7 @@ def parse_messages_in_chat_file(path: Path) -> list[Message]:
             pass
 
         elif c.name in {'h1', 'h3'}:
-            pass # Ignore log header
-
+            pass  # Ignore log header
 
         else:
             assert False, c
@@ -93,8 +104,6 @@ def parse_messages_in_chat_file(path: Path) -> list[Message]:
     return messages
 
 
-
-
 def parse_messages_in_chat_folder(chat_folder_path: Path) -> list[Message]:
     messages = []
     for file_path in chat_folder_path.iterdir():
@@ -112,6 +121,7 @@ def format_message_as_citation(out, msg):
         del line
     out.append('\n')
 
+
 def format_message_as_table(out, msg):
     out.append(f'| {msg.sent_at} | [[{msg.sender}]] | ')
     for line in msg.text.split('\n'):
@@ -119,17 +129,14 @@ def format_message_as_table(out, msg):
         del line
     out.append('|\n')
 
+
 def format_messages(messages: list[Message]) -> str:
-    out = [
-            '# Chat 2018'
-            '\n\n'
-    ]
+    out = ['# Chat 2018' '\n\n']
 
     as_table = False
 
-
     for msg_idx, msg in enumerate(messages):
-        if msg_idx == 0 or messages[msg_idx-1].sent_at.date() != msg.sent_at.date():
+        if msg_idx == 0 or messages[msg_idx - 1].sent_at.date() != msg.sent_at.date():
             out.append('---\n')
             out.append(f'## [[{msg.sent_at.date()}]]\n\n')
             if as_table:
@@ -144,21 +151,30 @@ def format_messages(messages: list[Message]) -> str:
 
     return ''.join(out)
 
+
 MSG_ADJACENTCY_DIST = datetime.timedelta(minutes=2)
 
+
 def is_adjacent_messages(first, second):
-    return first.sender == second.sender and second.sent_at - first.sent_at <= MSG_ADJACENTCY_DIST
+    return (
+        first.sender == second.sender
+        and second.sent_at - first.sent_at <= MSG_ADJACENTCY_DIST
+    )
+
 
 def merge_texts(text1: str, text2: str) -> str:
     punctuated = text1.endswith('.?!,:')
-    #return text1 + (' ' if punctuated else '. ') + text2
+    # return text1 + (' ' if punctuated else '. ') + text2
     return text1 + (' ' if punctuated else '. ') + '\n' + text2
 
+
 def merge_adjacent_messages(messages: list[Message]) -> list[Message]:
     out = []
     for msg in messages:
         if out and is_adjacent_messages(out[-1], msg):
-            out[-1] = dataclasses.replace(out[-1], text=merge_texts(out[-1].text, msg.text))
+            out[-1] = dataclasses.replace(
+                out[-1], text=merge_texts(out[-1].text, msg.text),
+            )
         else:
             out.append(msg)
     return out
diff --git a/libpurple_to_markdown/__main__.py b/libpurple_to_markdown/__main__.py
index 5b4ea0b..c4ac203 100644
--- a/libpurple_to_markdown/__main__.py
+++ b/libpurple_to_markdown/__main__.py
@@ -2,14 +2,15 @@ import argparse
 import logging
 from pathlib import Path
 
-from . import (parse_messages_in_chat_folder, merge_adjacent_messages,
-               format_messages)
+from . import format_messages, merge_adjacent_messages, parse_messages_in_chat_folder
+
 
 def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument('path', type=Path)
     return parser.parse_args()
 
+
 def main():
     logging.basicConfig()
     logging.getLogger().setLevel('INFO')
@@ -19,5 +20,6 @@ def main():
     messages = merge_adjacent_messages(messages)
     print(format_messages(messages))
 
+
 if __name__ == '__main__':
     main()
diff --git a/test/test_init.py b/test/test_init.py
index 0e5e703..bf34bc9 100644
--- a/test/test_init.py
+++ b/test/test_init.py
@@ -1,4 +1,5 @@
 import libpurple_to_markdown
 
+
 def test_version():
     assert libpurple_to_markdown.__version__ is not None