Time Since Last Pacman Sync/Upgrade

LICENSE

This is free and unencumbered software released into the public domain.

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of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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pacman-last-update.py

#!/usr/bin/env python3
import pathlib
import re
from datetime import datetime

LOG_PATH = pathlib.Path("/var/log/pacman.log")

def get_log():
    with LOG_PATH.open() as fp:
        log_text = fp.read()

    return log_text

def parse_pacman_line(line):
    if len(line) > 0:
        date_str = line[:18]
        pacman_indicator = line[19:27]
        message = line[28:]

        if pacman_indicator == "[PACMAN]":
            parsed_date = datetime.strptime(date_str,
                                            "[%Y-%m-%d %H:%M]")
            return {"date": parsed_date,
                    "message": message}

    return None

def get_last_sync(log_text):
    last_sync = None
    for line in log_text.split("\n"):
        
        parsed_line = parse_pacman_line(line)
        if parsed_line is None:
            continue
        else:
            if parsed_line["message"] == "synchronizing package lists":
                last_sync = parsed_line["date"]

    return last_sync

def get_last_system_upgrade(log_text):
    last_upgrade = None
    for line in log_text.split("\n"):        
        parsed_line = parse_pacman_line(line)
        if parsed_line is None:
            continue
        else:
            if parsed_line["message"] == "starting full system upgrade":
                last_upgrade = parsed_line["date"]

    return last_upgrade

def get_diffs(t):
    now = datetime.now()
    diff = now - t

    if diff.days != 0:
        return "{}d".format(diff.days)
    elif diff.seconds > 3600:
        return "{}h".format(diff.seconds // 3600)
    else:
        return "{}m".format(diff.seconds // 60)

if __name__ == "__main__":
    text = get_log()
    last_sync = get_last_sync(text)
    last_upgrade = get_last_system_upgrade(text)
    last_sync_diff = get_diffs(last_sync)
    last_upgrade_diff = get_diffs(last_upgrade)

    print("S: {} U: {}".format(last_sync_diff,
                               last_upgrade_diff))