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#!/usr/bin/env sh
# File: keyboard-leds-trayicons.sh
# License: CC-BY-SA 4.0
# Author: bgstack15
# Startdate: 2020-02-13 15:30
# Title: Substitute for Keyboard LED Indicators
# Purpose: For systems that do not show LEDs for capslock and numlock
# History:
# Usage:
# Reference:
# some Internet place that demonstrated how to use xset q
# some Internet place that showed how to convert the decimal to binary with awk
# get_conf comes from framework.sh
# Improve:
# provide way to change status of capslock by clicking the icon?
# Dependencies:
# binaries: mktrayicon, awk, xset
# little c: https://visualpharm.com/free-icons/c%20letter-595b40b65ba036ed117d1027
# license for icons: Use for free, but link to [icons8](https://icons8.com/license)
# CONFIG FILES
test -z "${KLT_GLOBAL_CONF}" && KLT_GLOBAL_CONF=/etc/keyboard-leds-trayicons.conf
test -z "${KLT_USER_CONF}" && KLT_USER_CONF="${HOME}/.config/keyboard-leds-trayicons.conf"
# also accept KLT_CONF
# FUNCTIONS
get_conf() {
# Ripped from framework.sh
# call: get_conf "${conffile}"
local _infile="$1"
local _tmpfile1="$( mktemp )"
sed -e 's/^\s*//;s/\s*$//;/^[#$]/d;s/\s*[^\]#.*$//;' "${_infile}" | grep -viE "^$" | while read _line ;
do
local _left="$( echo "${_line}" | cut -d'=' -f1 )"
eval "_thisval=\"\${${_left}}\""
test -z "${_thisval}" && echo "${_line}" >> "${_tmpfile1}"
done
test -f "${_tmpfile1}" && { . "${_tmpfile1}" 1>/dev/null 2>&1 ; }
/bin/rm -rf "${_tmpfile1}" 1>/dev/null 2>&1
}
clean_keyboard_leds_trayicons() {
{ test -e "${capslockicon}" && echo "q" > "${capslockicon}" ; } 1>/dev/null 2>&1 &
{ test -e "${numlockicon}" && echo "q" > "${numlockicon}" ; } 1>/dev/null 2>&1 &
sleep 1 && rm -f "${capslockicon}" "${numlockicon}" "${KLT_KILLFILE}"
}
get_led_mask() {
xset q | awk 'function d2b(d,b) {while(d) {b=d%2b;d=int(d/2)}return(b)} /LED/{print d2b($NF)}'
}
mask_position_on() {
# call: mask_position_on "${LEDS}" "${ledposition}"
___result="$( printf "%08d" "${1}" | tail -c "${2}" | head -c 1 )"
___result=$(( 1 - ___result ))
return "${___result}"
}
is_capslock_on() {
# call: get_led_mask | is_capslock_on && echo "yes"
read ___ico
mask_position_on "${___ico}" "1"
}
is_numlock_on() {
# call: get_led_mask | is_numlock_on && echo "yes"
read ___ico
mask_position_on "${___ico}" "2"
}
# LOAD CONFIGS
# order is important! The last one called gets precedence.
# instead of simply dot-sourcing the conf file, pass it to get_conf which only applies new values, so this process's environment is preserved
for thisconf in "${KLT_GLOBAL_CONF}" "${KLT_USER_CONF}" "${KLT_CONF}" ;
do
test -r "${thisconf}" && get_conf "${thisconf}"
done
# DEFAULTS in case configs did not have these values
test -z "${KLT_CAPS_ON_ICON}" && KLT_CAPS_ON_ICON=capslock-on
test -z "${KLT_CAPS_OFF_ICON}" && KLT_CAPS_OFF_ICON=capslock-off
test -z "${KLT_CAPS_ON_ICON}" && KLT_CAPS_ON_ICON=numlock-on
test -z "${KLT_CAPS_OFF_ICON}" && KLT_CAPS_OFF_ICON=numlock-off
test -z "${KLT_KILLFILE}" && KLT_KILLFILE="/tmp/kill-all-leds-trayicons"
# INITIALIZATION
capslockicon="/var/run/user/$( id -u )/${$}.cap.icon"
numlockicon="/var/run/user/$( id -u )/${$}.num.icon"
test "ON" = "ON" && {
mkfifo "${capslockicon}"
mkfifo "${numlockicon}"
mktrayicon "${capslockicon}" &
mktrayicon "${numlockicon}" &
echo "m quit,echo 'q' > ${capslockicon} ; touch "${KLT_KILLFILE}"" > "${capslockicon}"
echo "m quit,echo 'q' > ${numlockicon} ; touch "${KLT_KILLFILE}"" > "${numlockicon}"
}
caps_status_old=-1
num_status_old=-1
rm -f "${KLT_KILLFILE}"
trap 'trap "" 2 ; touch "${KLT_KILLFILE}" ' 2 # CTRL-C
while ! test -e "${KLT_KILLFILE}" 2>/dev/null ;
do
x="$( get_led_mask )"
caps_status_now=0
num_status_now=0
echo "${x}" | is_capslock_on && caps_status_now=1
echo "${x}" | is_numlock_on && num_status_now=1
if test "${caps_status_now}" != "${caps_status_old}" ;
then
test -p "${capslockicon}" && case "${caps_status_now}" in
1)
test -n "${KLT_DEBUG}" && echo "capslock on (icon file ${KLT_CAPS_ON_ICON})" 1>&2
echo "i ${KLT_CAPS_ON_ICON}" > "${capslockicon}"
echo "t capslock on" > "${capslockicon}"
;;
0)
test -n "${KLT_DEBUG}" && echo "capslock off (icon file ${KLT_CAPS_OFF_ICON})" 1>&2
echo "i ${KLT_CAPS_OFF_ICON}" > "${capslockicon}"
echo "t capslock off" > "${capslockicon}"
;;
esac
fi
if test "${num_status_now}" != "${num_status_old}" ;
then
test -p "${numlockicon}" && case "${num_status_now}" in
1)
test -n "${KLT_DEBUG}" && echo "numlock on (icon file ${KLT_NUM_ON_ICON})" 1>&2
echo "i ${KLT_NUM_ON_ICON}" > "${numlockicon}"
echo "t numlock on" > "${numlockicon}"
;;
0)
test -n "${KLT_DEBUG}" && echo "numlock off (icon file ${KLT_NUM_OFF_ICON})" 1>&2
echo "i ${KLT_NUM_OFF_ICON}" > "${numlockicon}"
echo "t numlock off" > "${numlockicon}"
;;
esac
fi
caps_status_old="${caps_status_now}"
num_status_old="${num_status_now}"
sleep 0.75
done
# safety shutoff
clean_keyboard_leds_trayicons
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