#!/bin/sh
# Copyright (C) 2014 Alexander Keller <github@nycroth.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#------------------------------------------------------------------------

INTERFACE="${BLOCK_INSTANCE:-wlan0}"

#------------------------------------------------------------------------

# As per #36 -- It is transparent: e.g. if the machine has no battery or wireless
# connection (think desktop), the corresponding block should not be displayed.
[[ ! -d /sys/class/net/${INTERFACE}/wireless ]] ||
    [[ "$(cat /sys/class/net/$INTERFACE/operstate)" = 'down' ]] && exit

COLOR_MAC="${COLOR_MAC:-grey}"
COLOR_FREQ="${COLOR_FREQ:-white}"
COLOR_SIGNAL="${COLOR_SIGNAL:-#589df6}"
COLOR_BANDWIDTH="${COLOR_BANDWIDTH:-grey}"

echo -n " ";
iw dev $INTERFACE link | head -8 | grep -vE '(SSID|TX|RX)' \
	| sed -e "s/.*to .*\([0-9a-f:]\{5\}\) .on.*/<span color='$COLOR_MAC'>\1<\/span>/g; s/^\s//g" \
	| tr -d "\n" \
	| sed -e "s/freq: / <span color='$COLOR_FREQ'>/g; s/signal: /<\/span> <span color='$COLOR_SIGNAL'>/g; s/mrx bitrate: \([0-9\.]*\).*tx bitrate: \([0-9\.]*\).*/<\/span> <span color='$COLOR_BANDWIDTH'>\1\/\2<\/span>/g;"
echo ""