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#!/usr/bin/env python3
# Copyright (c) 2017-2026 Juancarlo Añez (apalala@gmail.com)
# SPDX-License-Identifier: BSD-4-Clause
"""
Log parser to split, reverse, and rejoin git-style logs.
Diagnostic messages are sent to stderr; reversed text is sent to stdout.
by [apalala@gmail.com](https://github.com/apalala)
Gemini 3 Flash - 2026-01-28
"""
from __future__ import annotations
import os
import re
import sys
def parse_commits(log_text):
# by [apalala@gmail.com](https://github.com/apalala)
pattern = re.compile(r'^> commit', re.MULTILINE)
starts = [m.start() for m in pattern.finditer(log_text)]
ends = starts[1:] + [len(log_text)]
return [log_text[start:end].strip() for start, end in zip(starts, ends)]
def main():
# by [apalala@gmail.com](https://github.com/apalala)
if len(sys.argv) < 2:
print(f"Usage: {sys.argv[0]} <log_file>", file=sys.stderr)
sys.exit(1)
filename = sys.argv[1]
if not os.path.isfile(filename):
print(f"Error: File '{filename}' not found.", file=sys.stderr)
sys.exit(1)
try:
with open(filename, 'r', encoding='utf-8') as f:
log_content = f.read()
except Exception as e:
print(f"Error reading file: {e}", file=sys.stderr)
sys.exit(1)
commits = parse_commits(log_content)
# Send diagnostic info to stderr
print(f"Parsed {len(commits)} commits from {filename}.", file=sys.stderr)
# Reverse the list of commits
commits.reverse()
# Rejoin the content with spacing for readability
output_text = "\n\n".join(commits)
# Print the actual text output to stdout
print(output_text)
if __name__ == "__main__":
main()
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