Explicitly require 'rx

Update docstring for simple-mpc-status-re

Use simple-mpc-extract-status to get playlist-length

Replaces simple-mpc-get-amount-of-songs-in-playlist.

Use simple-mpc-extract-status to get playlist-position

Replaces simple-mpc-get-current-playlist-position.

Use simple-mpc-extract-status to get current volume

Replaces simple-mpc-message-current-volume.

Use regex capture groups to extract parts of `mpc status'

This is more robust and easier than using buffer movements.

Extract bits from mpc with simple-mpc-extract-status macro

I think this macro makes it easier to read what's going on.

Extract status without setting mark

Update copyright notice

Echo song position, artist, and name when seeking

Add simple-mpc-song-position

Echo current repeat status when toggling repeat status

Echo artist and song when jump to next/prev song

Echo playing status, artist, and song when toggling play/paused

Add simple-mpc-repeat-status

Add simple-mpc-playing-status

Add simple-mpc-current-artist-and-song

fix typo in Hook section of README.org

Add example hook for starting MPD

Add repeat mode toggle