thisdougb/AppleMagicPower.sh

## AppleMagicPower.sh
#!/usr/bin/env bash
#
# Pops up a window notification to let you know when your Magic devices are below THRESHOLD. OSX
# gives you a warning at about 2% battery (mouse and keyboard), which means you have to stop work
# when the battery dies.  Threshold at 20% gives you a few days of power to fit charging in.
#
# eg:
#      ---------------------------------------
#      |                                     |
#      |   Get a coffee and charge:          |
#      |                                     |
#      |       Magic Mouse 2 at 18%          |
#      |       Magic Keyboard at 5%.         |
#      |                                     |
#      |                                     |
#      |                        OK   Cancel  |
#      ---------------------------------------
#
#
#
# 1. Save locally as AppleMagicPower.sh, chmod +x <file>
#
# 2. Add a cron entry to run it, for example:
#   30 9 * * * /Users/dougb/dev/scripts/AppleMagicPower.sh
#
# (OSX asks permission to run this the first time)
#
# @thisdougb, 25/04/2020

# You can change the threshold
THRESHOLD=20

# You can change the message, if coffee is not your thing
MESSAGE="Get a coffee and charge:"

# Probably best leave this as is
DEVICES=("Magic Mouse 2" "Magic Keyboard")

# --------------- Change nothing below here ---------------
messages=()

for index in ${!DEVICES[*]}
do
        device=${DEVICES[$index]}
                                                                                     # trying to make it readable
        powerValue=$(/usr/sbin/ioreg -r -l -n AppleHSBluetoothDevice -a              \
                | awk -v dev="$device"                                               \
                        'BEGIN { battery_value = 0 }                                 \
                         /\<key\>BatteryPercent\<\/key\>/                            \
                                {                                                    \
                                        getline;                                     \
                                        match($0, "[0-9]{1,3}");                     \
                                        battery_value = substr($0, RSTART, RLENGTH)  \
                                 }                                                   \
                         /\<key\>Product\<\/key\>/                                   \
                                {                                                    \
                                        getline;                                     \
                                        if ($0 ~ dev) {                              \
                                                print battery_value;                 \
                                                exit 0;                              \
                                        } else {                                     \
                                                battery_value = 0                    \
                                        }                                            \
                                }                                                    \
                         ')

        int_re='^[0-9]+$'
        if [[ $powerValue =~ $int_re ]] ; then
                if [ $powerValue -le $THRESHOLD ]; then
                        messages[$index]="$device at $powerValue%"
                fi
        fi
done

len=${#messages[@]}
if (( "$len" > 0 )); then

        if [[ -z $MESSAGE ]]; then
                message="Get a coffee and charge:"
        else
                message=$MESSAGE
        fi

        for index in ${!messages[*]}
        do
                message="$message\n\t${messages[$index]}"
        done

        /usr/bin/osascript <<-EOF
           tell application "System Events"
              activate
             display dialog "$message"
           end tell
EOF
fi
	#!/usr/bin/env bash
	#
	# Pops up a window notification to let you know when your Magic devices are below THRESHOLD. OSX
	# gives you a warning at about 2% battery (mouse and keyboard), which means you have to stop work
	# when the battery dies. Threshold at 20% gives you a few days of power to fit charging in.
	#
	# eg:
	# ---------------------------------------
	# \| \|
	# \| Get a coffee and charge: \|
	# \| \|
	# \| Magic Mouse 2 at 18% \|
	# \| Magic Keyboard at 5%. \|
	# \| \|
	# \| \|
	# \| OK Cancel \|
	# ---------------------------------------
	#
	#
	#
	# 1. Save locally as AppleMagicPower.sh, chmod +x <file>
	#
	# 2. Add a cron entry to run it, for example:
	# 30 9 * * * /Users/dougb/dev/scripts/AppleMagicPower.sh
	#
	# (OSX asks permission to run this the first time)
	#
	# @thisdougb, 25/04/2020

	# You can change the threshold
	THRESHOLD=20

	# You can change the message, if coffee is not your thing
	MESSAGE="Get a coffee and charge:"

	# Probably best leave this as is
	DEVICES=("Magic Mouse 2" "Magic Keyboard")

	# --------------- Change nothing below here ---------------
	messages=()

	for index in ${!DEVICES[*]}
	do
	device=${DEVICES[$index]}
	# trying to make it readable
	powerValue=$(/usr/sbin/ioreg -r -l -n AppleHSBluetoothDevice -a \
	\| awk -v dev="$device" \
	'BEGIN { battery_value = 0 } \
	/\<key\>BatteryPercent\<\/key\>/ \
	{ \
	getline; \
	match($0, "[0-9]{1,3}"); \
	battery_value = substr($0, RSTART, RLENGTH) \
	} \
	/\<key\>Product\<\/key\>/ \
	{ \
	getline; \
	if ($0 ~ dev) { \
	print battery_value; \
	exit 0; \
	} else { \
	battery_value = 0 \
	} \
	} \
	')

	int_re='^[0-9]+$'
	if [[ $powerValue =~ $int_re ]] ; then
	if [ $powerValue -le $THRESHOLD ]; then
	messages[$index]="$device at $powerValue%"
	fi
	fi
	done

	len=${#messages[@]}
	if (( "$len" > 0 )); then

	if [[ -z $MESSAGE ]]; then
	message="Get a coffee and charge:"
	else
	message=$MESSAGE
	fi

	for index in ${!messages[*]}
	do
	message="$message\n\t${messages[$index]}"
	done

	/usr/bin/osascript <<-EOF
	tell application "System Events"
	activate
	display dialog "$message"
	end tell
	EOF
	fi