bthandler/bt

#!/bin/sh
#load config
CONFIG="${XDG_CONFIG_HOME:-$HOME/.config}/bt/config"
#shellcheck disable=SC1090
. "$CONFIG"

"$AUTOTRUST" || actions="$(printf '%s\ntrust\n' "$actions")"

power(){
	powerstatus="$( bluetoothctl show | grep Powered | awk '{print $2}' )"
	if [ "$powerstatus" = "no" ]; then
		[ "$1" = on ] && bluetoothctl power on
	elif [ "$powerstatus" = "yes" ]; then
		[ "$1" = off ] && bluetoothctl power off
	fi
}

scan(){
	scanstatus="$( bluetoothctl show | grep Discovering | awk '{print $2}' )"
	if [ "$1" = on ]; then
		#sets variable in case scanning was no already on before the start of bt
		[ -f /tmp/bt_start_scan$$ ] || start_scan="$( date +'%s' )"
		if [ "$scanstatus" = "no" ]; then
			bluetoothctl scan on  &
			start_scan="$( date +'%s' )"
		fi
		echo "$start_scan" > /tmp/bt_start_scan$$
	elif [ "$1" = off ]; then
		if [ "$scanstatus" = "yes" ]; then
			bluetoothctl scan off
		fi
	fi
}

#Check bluetoothctl paired-devices for new devices to be hardcoded into pair list
update_pair_list(){
	btctl_paired_devices="$(bluetoothctl paired-devices)"
	if [ -n "$btctl_paired_devices" ]
	then
		#do not modify files when issues occur
		if echo "$btctl_paired_devices" | grep -q "No default controller available"; then
			return
		fi
		#needs temp var as it writes into the same file as it reads from
		btctl_not_in_list="$( echo "$btctl_paired_devices" | grep -vf "$PAIRLIST")"
		[ -n "$btctl_not_in_list" ] && echo "$btctl_not_in_list" >> "$PAIRLIST"
	fi
}


#start scanning as early as possible to speed up pairing process
startup(){
	if $AUTOSCAN
	then
		power on
		scan on
	fi
}


if [ "$1" = "edit" ]; then
	case $2 in
		"config")${EDITOR:-vim} "$CONFIG";;
		"paired")${EDITOR:-vim} "$PAIRLIST";;
		"alias")${EDITOR:-vim} "$ALIASLIST";;
		"blacklist")${EDITOR:-vim} "$BLACKLIST";;
		*)echo "options: config/paired/alias/blacklist" && exit 1;;
		esac
	exit
fi

startup &
update_pair_list &

# shellcheck disable=SC1091
connected_ids="$(bluetoothctl devices | awk '{print "bluetoothctl info "$2}' | . /dev/stdin | grep -E '(^Device |Connected:)' | sed -e  'N;s/\n/;/' | grep 'Connected: yes' | cut -d' ' -f2,5)"

de_alias(){
	while read -r id; do
		if grep -q "$id" "$ALIASLIST"; then
			grep "$id" "$ALIASLIST" | cut -d' ' --complement -f1
		else
			grep "$id" "$PAIRLIST" | cut -d' ' --complement -f1,2
		fi
	done
}


[ -z "$connected_ids" ] ||
connected_devices="$( echo "$connected_ids" | de_alias )"

# shellcheck disable=SC2154
"$include_disconnect_option" &&
	[ -n "$connected_devices" ] &&
	actions="$(printf "disconnect\n%s" "$actions")"

#Compile list of all device ids of paired devices (from bluetoothctl and from hardcoded list)
connected_ids="$( ( bluetoothctl paired-devices && cat "$PAIRLIST" ) | sort -u | cut -d' '  -f2)"
paired_devices="$( echo "$connected_ids" | de_alias )"

echo "paired_devices:"
echo "$paired_devices"

disp_devices="$( echo "$paired_devices" | grep -vf "$BLACKLIST" )"

#show which devices are connected in menu
disp_devices_with_links="$(echo "$paired_devices" | while read -r device; do
	printf '%s' "$device"
	if [ -n "$connected_devices" ] &&
		echo "$device" | grep -q "$connected_devices"
		then
		printf '🔗'
	fi
	printf '\n'
done
)"

#detects current power mode of controller and adjusts options accordingly
powerstatus="$( bluetoothctl show | grep Powered | awk '{print $2}' )"
poweroption="$( echo "$powerstatus" | sed 's/yes/power off/; s/no/power on/' )"
#Don't print empty device list, removes unnecessary empty choice in dmenu
if [ "$disp_devices" = "" ];then
	choice=$( printf "%s\n%s" "$actions" "$poweroption" |
		dmenu -i -p 'What BT action would you like to perform:')
else
	choice=$( ( echo "$disp_devices_with_links" && printf "%s\n%s" "$actions" "$poweroption" ) |
		dmenu -i -p 'What BT action would you like to perform:' | sed 's/🔗$//')
fi

cleanup(){
	scan off
	rm -f /tmp/bt_start_scan*
	pkill -RTMIN+$barsignal $bar
	exit 0
}

pair(){
	#since this function can get called indefinitely, make sure to always be scanning and controller has power in the case that it got deactived by some other process.
	power on
	scan on > /dev/null
	#check whether $SCAN_PERIOD seconds has already passed since starting scanning, if not, wait for the rest of that time.
	start_scan="$(cat /tmp/bt_start_scan$$)"
	if [ $(( $(date +'%s') - start_scan )) -lt "$SCAN_PERIOD" ]; then
		sleep_period="$(( SCAN_PERIOD - $( date +'%s') + start_scan ))"
		[ "$sleep_period" -gt 1 ] && plural="s"
		notify-send "bt" "Searching for devices, please wait $sleep_period second$plural"
		sleep "$sleep_period"
		unset plural
	fi
	all_devices="$( bluetoothctl devices )"
	if [ "$paired_devices" = "" ]; then
		new_devices="$( echo "$all_devices" | awk '{for (i=3; i<NF; i++) printf $i " "; print $NF}' )"
		bt_IDS="$( echo "$all_devices" | awk '{print $2}' )"
	else
		filtered_devices="$( echo "$all_devices" | grep -v "$paired_devices")"
		bt_IDS="$( echo "$filtered_devices" | awk '{print $2}' )"
		new_devices="$( echo "$filtered_devices" | awk '{for (i=3; i<NF; i++) printf $i " "; print $NF}' )"
	fi
	[ "$new_devices" = "" ] && options="rescan" || options=$(echo "$new_devices" && echo 'rescan')
	choice=$( echo "$options" | dmenu -l 10 -i -p 'pair with which device?' )
	if [ -n "$choice" ]; then
		if [ "$choice" = "rescan" ]; then
			start_scan="$( date +'%s')"
			echo "$start_scan" > /tmp/bt_start_scan$$
			pair
		else
			dev_no=$( echo "$new_devices" | nl | grep "$choice" | awk '{print $1}')
			dev_id=$( echo "$bt_IDS" | nl | grep -P "^ *$dev_no\t" | awk '{print $2}' )
			#only attempt to connect if pairing succeeds
			bluetoothctl pair "$dev_id" && ( pair_succesful=true && bluetoothctl connect "$dev_id" ) || pair_succesful=false
			if $AUTOTRUST; then
				bluetoothctl trust "$dev_id"
			fi
			#if device is not already hard coded as paired, add to paired devices list
			if $pair_succesful && [ "$( grep "$dev_id" "$PAIRLIST")" = "" ] || [ "$(wc -l < "$PAIRLIST")" -eq 0 ]
			then
				echo to be added to "$PAIRLIST":
				echo Device "$dev_id" "$choice"
				echo Device "$dev_id" "$choice" >> "$PAIRLIST"
			fi
		fi
	fi
}

case $choice in
	"power on") bluetoothctl power on;;
	"power off") bluetoothctl power off;;
	"scan on") bluetoothctl power on && echo power on && sleep 2
		([ -n "$TERMINAL" ] && $TERMINAL -e bluetoothctl scan on ) || st bluetoothctl scan on > /dev/null;;
	"pair") pair;;
	"unpair") choice=$( echo "$paired_devices" | dmenu -l 10 -i -p 'remove which paired device?')
		if [ -n "$choice" ]; then
			dev_no=$( echo "$paired_devices" | nl | grep -P "[0-9]+\t$choice$" | awk '{print $1}')
			dev_id=$( echo "$bt_IDS" | nl | grep -P "^.*$dev_no\t" | awk '{print $2}' )
			bluetoothctl remove "$dev_id"
			#remove device to unpair from hard coded paired devices list
			new_paired_list="$( grep -v "$dev_id" "$PAIRLIST" )"
			if [ "$new_paired_list" != "" ]
			then
				echo "$new_paired_list" > "$PAIRLIST"
			else
				rm -rf "$PAIRLIST"
				touch "$PAIRLIST"
			fi
		fi;;

	"trust")
		#search through all devices which are connected and only list those as options
		# shellcheck disable=SC1091
		untrusted_device_ids="$( awk '{print "bluetoothctl info "$2}' "$PAIRLIST" | . /dev/stdin | grep -E '(Device |Trusted:)' | sed -e  'N;s/\n/;/;s/^.?*Alias: //' | grep "Trusted: no" | cut -d' ' -f2 )"
		untrusted_devices="$( echo "$untrusted_device_ids" | de_alias )"
		if [ "$( echo "$untrusted_devices" | wc -l )" -gt 0 ]
		then
			choice=$( echo "$untrusted_devices" | dmenu -l 10 -i -p 'trust which paired device?')
		else
			notify-send "bt" "No paired devices that are not trusted already."
		fi
		if [ -n "$choice" ]; then
			dev_no=$( echo "$paired_devices" | nl | grep -P "[0-9]+\t$choice$" | awk '{print $1}')
			dev_id=$( echo "$bt_IDS" | nl | grep -P "^.*$dev_no\t" | awk '{print $2}' )
			bluetoothctl trust "$dev_id"
		fi;;
	"disconnect")
		#search through all devices and check which are connected
		#only list those connceted devices as options
		# shellcheck disable=SC1091
		connected_ids="$(bluetoothctl devices | awk '{print "bluetoothctl info "$2}' | . /dev/stdin | grep -E '(^Device |Connected:)' | sed -e  'N;s/\n/;/' | grep 'Connected: yes' | cut -d' ' -f2,5)"
		connected_devices="$( echo "$connected_ids" | de_alias )"
		#only open dmenu prompt if there is more than one connected device
		if [ "$( echo "$connected_devices" | wc -l )" -gt 1 ]
		then
			choice=$( echo "$connected_devices" | dmenu -l 10 -i -p 'disconnect which paired device?')
	        else
			choice="$connected_devices"
		fi
		#only there was a choice (instead of canceling the dmenu)
		if [ -n "$choice" ]; then
			dev_no=$( echo "$paired_devices" | nl | grep -P "[0-9]+\t$choice$" | awk '{print $1}')
			dev_id=$( echo "$bt_IDS" | nl | grep -P "^.*$dev_no\t" | awk '{print $2}' )
			bluetoothctl disconnect "$dev_id"
		fi;;
	"blacklist")
		choice=$( echo "$paired_devices" | dmenu -l 10 -i -p 'blacklist which paired device from selection?')
		if [ -n "$choice" ]; then
			echo "$choice" >> "$BLACKLIST"
		fi;;
	*)
		echo "choice: $choice"
		dev_no=$( echo "$paired_devices" | nl | grep -P "[0-9]+\t$choice$" | awk '{print $1}')
		[ "$dev_no" != "" ] && dev_id=$( echo "$connected_ids" | nl | grep -P "^.*$dev_no\t" | awk '{print $2}')
		echo "dev_id: $dev_id"
		if [ -n "$dev_id" ]; then
			power on
			if bluetoothctl info "$dev_id" | grep -q "Connected: yes"
			then
				echo Was connceted... disconnecting
				bluetoothctl disconnect "$dev_id"
			else
				if ! bluetoothctl paired-devices | grep -q "$dev_id"; then
					echo "not in paired-devices list, re-adding (device needs to be in pairing mode for this)"
					notify-send "bt" "device not in paired-devices list, re-pairing"
					all_devices="$(bluetoothctl devices | cut -d' ' -f2)"
					if ! echo "$dev_id" | grep -q "$all_devices"; then
						scan on
						start_scan="$(cat /tmp/bt_start_scan$$)"
						echo "Scan on"
						notify-send "bt" "Scanning for new devices until wanted device has been found"
						until echo "$dev_id" | grep -q "$all_devices"; do
							sleep 1
							all_devices="$(bluetoothctl devices | cut -d' ' -f2)"
							time_scanned="$(( $(date +'%s') - start_scan ))"
							[ "$time_scanned" -gt 30 ] && exit 1
						done
					fi
					echo Attempting to pair...
					bluetoothctl pair "$dev_id"
					scan off
				fi
				echo connecting...
				bluetoothctl connect "$dev_id"
			fi
		fi;;
esac

cleanup