unclack-linux

unclack-linux

#!/usr/bin/env bash
# Program to mute the microphone while you are typing away on your loud keyboard.
# Inspired by the Unclack app for macOS 
# This program is written by github.com/adrianlshaw and licensed under GPLv2
# To install as a background daemon, run "./unclack-linux install"
# Does not require sudo, but does assume you have systemd and pulseaudio

SERVICEFILE="
[Unit]
Description=unclack-linux

[Service]
Type=simple
ExecStart=$HOME/.local/bin/unclack-linux
Restart=always

[Install]
WantedBy=multi-user.target
"

if [[ "$1" == "install" ]]; then
	MY_PATH="`dirname \"$0\"`"
	MY_PATH="`( cd \"$MY_PATH\" && pwd )`"
	if [ -z "$MY_PATH" ] ; then
		echo "Failed to install"
		exit 1
	fi
	mkdir ~/.local/bin/ --parents
	cp "$MY_PATH/$0" ~/.local/bin/
	chmod +x "$HOME/.local/bin/unclack-linux"
	echo "$SERVICEFILE" > "$HOME/.config/systemd/user/unclack-linux.service"
	systemctl --user daemon-reload
	systemctl --user enable unclack-linux
	systemctl --user restart unclack-linux
	echo "Service file installed in $HOME/.config/systemd. Binary installed in $HOME/.local/bin/"
	exit 0
fi

FILENAME=/tmp/.lastkeypress
LASTPRESS=0
CURRENT=0
THRESHOLD=200
DEVICE=$(pactl list short sources | grep RUNNING | head -n 1 | cut -f1)

trap ctrl_c INT

function ctrl_c() {
        echo "Trapped CTRL-C"
	pactl set-source-mute "$DEVICE" false
	echo "Unmuted"
	exit 1
}

background_task() {
	xinput test-xi2 --root | grep --line-buffered RawKeyPress |
		while read -r line; do
			LASTPRESS=$(date +%s%N | cut -b1-13)
			echo "$LASTPRESS" > $FILENAME
		done
}

rm $FILENAME
echo 0 > $FILENAME

background_task & # kick off background task

echo "Starting off unmuted"
pactl set-source-mute "$DEVICE" false # start off with unmuted device

while true
do
	# Check active device on every loop. If mic is not active then sleep for a while
	# to save some energy
	DEVICE=$(pactl list short sources | grep RUNNING | head -n 1 | cut -f1)

	if [[ -z "$DEVICE" ]]; then
		sleep 5
		continue
	fi

	CURRENT=$(date +%s%N | cut -b1-13)
	LAST=$(cat $FILENAME)
	DIFF=$(expr $CURRENT - $LAST)

	echo "$DIFF"

	if [ "$DIFF" -gt "$THRESHOLD" ]; then
		echo "Unmuting"
		pactl set-source-mute "$DEVICE" false
	else
		echo "Muting"
		pactl set-source-mute "$DEVICE" true
	fi
	sleep 0.1

done