dot-files/scripts/btmenu

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#!/bin/bash
# Inspired by <https://github.com/cdown/btmenu>
function show_usage() {
echo "A simple bluetoothctl from bluez-utilies interface for dmenu(1)"
echo ""
echo "Usage:"
echo -e "\tbtmenu [OPTION] [DEVICE]"
echo -e "\t\tWithout any options, defaults to connecting to device"
echo "Options:"
echo -e "\t-h, --help\n\t\tshow this message and quit"
echo -e "\t-d, --disconnect\n\t\tDisconnect the device"
exit 0
}
function _bluetoothctl() {
LC_ALL=C timeout 30 bluetoothctl
}
# Connects by default
mode=connect
# Name -> MAC
declare -A DEVICES
while read -r _ mac name; do
DEVICES["$name"]=$mac
done < <(echo "devices" | _bluetoothctl | awk '$1 == "Device"')
# Notify the user about the operation
function notify() {
local msg
local is_error
msg=${1?BUG: no message}
is_error=${2:-0}
if command -v notify-send >/dev/null 2>&1; then
notify-send "btmenu" "$msg" # TODO: escaping
fi
if (( is_error )); then
printf 'ERROR: %s\n' "$msg" >&2
else
printf '%s\n' "$msg"
fi
}
function execute_mode() {
local mode
local name
local mac
local preposition
local expected_to_connect
local retries
mode=${1?BUG: missing mode}
retries=15
case $mode in
connect)
preposition=to
expected_to_connect=yes
;;
disconnect)
preposition=from
expected_to_connect=no
;;
esac
if ! (( ${#DEVICES[@]} )); then
notify "No devices found. Are they registered with D-Bus?" 1
return 2
fi
name=$(printf '%s\n' "${!DEVICES[@]}" | dmenu -l 10 -p "btmenu" "${dmenu_args[@]}")
[[ $name ]] || return
mac=${DEVICES["$name"]}
notify "Attempting to $mode $preposition $name"
while (( retries-- )); do
printf 'power on\n%s %s\n' "$mode" "$mac" | _bluetoothctl
if printf 'info %s\n' "$mac" |
_bluetoothctl |
grep -Pq '^[\t ]+Connected: '"$expected_to_connect"; then
notify "${mode^}ed $preposition $name"
return 0
fi
sleep 1
done
ret="$?"
notify "Failed to $mode $preposition $name" 1
return "$ret"
}
i=2
# FIXME: I want to have a list of devices with their connection status instead
# of having to launch the script with the correct argument to connect/disconnect
for arg do
if [[ $arg == -- ]]; then
dmenu_args=( "${@:$i}" )
break
fi
case "$arg" in
-d|--disconnect) mode=disconnect ;;
-h|--help) show_usage ;;
esac
(( i++ ))
done
execute_mode "$mode"