I use [[MPD]] to organize and play my music, since it's a pretty thin
layer over the directory structure I'd been using before.  MPD's
playlists are stored in `/var/lib/mpd/playlists/` as [M3U][] files
(one filename per line), so it easy to build your own tools to work
with the playlists directly.

Anyhow, I was interedted in determining the total runtime for a
playlist, and searching around brought me to Repolho's [post][] which
I've condensed to:

    $ mpc --format '%time%' playlist | awk -F ':' 'BEGIN{t=0} {t+=$1*60+$2} END{print strftime("%j %H:%M:%S", t, 1)}'
    001 10:48:35

Note that, unfortunately, `%j` returns the day of the year in the
range `[001,366]`, so an empty playlist would return `001 00:00:00`,
not the `000 00:00:00` I'd like.  Oh well.

[M3U]: http://en.wikipedia.org/wiki/M3U
[post]: http://repura.livejournal.com/59403.html?thread=156683

[[!tag tags/linux]]
[[!tag tags/fun]]