tm - a text-based stopwatch/countdown timer tool

To compile:

    make

Depends on libnotify.

Usage:

    tm             # stopwatch
    tm 2h 30m 10s  # timer for two hours, thirty minutes, ten seconds
    tm 2h30m10s    # the following formats are all equivalent
    tm 2:30:10
    tm 2 hours 30 minutes 10 seconds
    tm 2 30 10
    tm 2 h 30 m 10 s