log_file_cleaner.py

import os        # work with files and folders
import time      # work with timestamps
from datetime import datetime, timedelta  # easier date handling

# Folder containing your log files
log_folder = os.path.expanduser("~/Downloads")  # change if needed

# Settings
days_to_keep = 7          # delete files older than this many days
max_file_size_mb = 5      # truncate files bigger than this size (in MB)

# Convert MB to bytes (because file sizes are in bytes)
max_file_size_bytes = max_file_size_mb * 1024 * 1024

# Get current time
now = time.time()

# Go through all files in the folder
for filename in os.listdir(log_folder):

    file_path = os.path.join(log_folder, filename)

    # Skip folders
    if os.path.isdir(file_path):
        continue

    # Only process .log files (you can change this)
    if not filename.endswith(".log"):
        continue

    # --- PART 1: Delete old files ---

    # Get the last modified time of the file
    file_modified_time = os.path.getmtime(file_path)

    # Convert days_to_keep into seconds
    age_limit = days_to_keep * 24 * 60 * 60

    # If file is older than allowed → delete it
    if now - file_modified_time > age_limit:
        os.remove(file_path)
        print(f"Deleted old log file: {filename}")
        continue  # skip to next file

    # --- PART 2: Truncate large files ---

    # Get file size in bytes
    file_size = os.path.getsize(file_path)

    if file_size > max_file_size_bytes:
        print(f"Truncating large log file: {filename}")

        # Read the last part of the file (keep recent logs)
        with open(file_path, "r") as file:
            lines = file.readlines()

        # Keep only the last 100 lines (you can change this)
        last_lines = lines[-100:]

        # Write back only the last lines
        with open(file_path, "w") as file:
            file.writelines(last_lines)

        print(f"Kept last 100 lines of {filename}")