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#!/bin/sh -e
#
#    wifi_quality: display wifi signal quality
#
#    Copyright (C) 2008 Canonical Ltd.
#    Copyright (C) 2011-2014 Dustin Kirkland
#
#    Authors: Dustin Kirkland <kirkland@byobu.org>
#
#    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, version 3 of the License.
#
#    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/>.

___get_dev_list() {
	if [ -n "$MONITORED_NETWORK" ]; then
		echo "$MONITORED_NETWORK"
	else
		iw dev | grep Interface | cut -f2 -d\ 
	fi
}

__wifi_quality_detail() {
	if eval $BYOBU_TEST iw >/dev/null 2>&1; then
		local dev
		for dev in $(___get_dev_list); do
			iw dev "$dev" info
			iw dev "$dev" link
			echo
		done
	elif eval $BYOBU_TEST iwconfig >/dev/null 2>&1; then
		iwconfig 2>/dev/null
	fi
}

__wifi_quality() {
	local out bitrate quality
	if eval $BYOBU_TEST iwconfig >/dev/null 2>&1; then
		# iwconfig is expected to output lines like:
		#    Bit Rate=54 Mb/s   Tx-Power=15 dBm
		#    Link Quality=60/70  Signal level=-50 dBm
		# the awk below tokenizes the output and prints shell evalable results
		out=`iwconfig $MONITORED_NETWORK 2>/dev/null |
			awk '$0 ~ /[ ]*Link Quality./ {
			    sub(/.*=/,"",$2); split($2,a,"/");
			    printf "quality=%.0f\n", 100*a[1]/a[2] };
			    $0 ~ /[ ]*Bit Rate/ { sub(/.*[:=]/,"",$2); printf("bitrate=%s\n", $2); }
			    '`
		eval "$out"
	elif eval $BYOBU_TEST iw >/dev/null 2>&1; then
		local dev
		for dev in $(___get_dev_list); do
			# iw is expected to output lines like:
			#     signal: -50 dBm
			#     rx bitrate: 216.0 MBit/s MCS 13 40MHz
			# signal to quality: https://superuser.com/a/1360447
			out=`iw dev "$dev" link 2>/dev/null |
				awk '$0 ~ /^\s*signal:/ { a = 100 * ($2 + 110) / 70;
				    printf "quality=%.0f\n", (a > 100) ? 100 : ((a < 0) ? 0 : a); }
				    $0 ~ /^\s*rx bitrate:/ { printf "bitrate=%s\n", $3; }
				    '`
			eval "$out"
			[ -z "$bitrate" ] || [ -z "$quality" ] || break
		done
	fi
	[ -n "$bitrate" ] || bitrate=0
	[ -n "$quality" ] || quality=0
	if [ "$bitrate" -gt 0 ] && [ "$quality" -gt 0 ]; then
		printf "${ICON_WIFI}"; color b C k; printf "%s" "$bitrate"; color -; color C k; printf "%s" "$ICON_MBPS"; color -; color b C k; printf "%s" "$quality"; color -; color C k; printf "%s" "$PCT"; color --
	else
		rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/wifi_quality"*
	fi
}

# vi: syntax=sh ts=4 noexpandtab