Multi–layout Switcher based on kbdd

kbdl.sh

#!/bin/sh

### Constants

# the index of the first layout in the primary layer
PRIMARY_LAYER=0
# the index of the first and only layout in the secondary layer
SECONDARY_LAYER=2

### Functions

_call_kbdd() {
    _method=${1}; shift
    dbus-send \
        --print-reply=literal \
        --dest=ru.gentoo.KbddService \
        /ru/gentoo/KbddService \
        "ru.gentoo.kbdd.${_method}" "${@}"
}

get_layout() {
    _call_kbdd getCurrentLayout | sed -r 's/ *uint32 +([[:digit:]])/\1/'
}

set_layout() {
    _id=${1}; shift
    _call_kbdd set_layout "uint32:${_id}"
}

prev_layout() {
    _call_kbdd prev_layout
}

get_layout_name() {
    _id=${1}; shift
    _call_kbdd getLayoutName "uint32:${_id}" | sed -r 's/ *(.+)/\1/'
}

notify() {
    _id=${1}; shift
    _layout=$(get_layout_name "${_id}")
    _icon="indicator-keyboard-$(echo "${_layout}" | cut -c 1-2 | sed s/Ge/Ka/)"
    notify-send -t 300 -i "${_icon}" "${_layout}"
}

### Main

set_layout ${PRIMARY_LAYER}

toggle_layouts() {
    _layout=$(get_layout)
    if [ "${_layout}" -eq ${SECONDARY_LAYER} ]; then
        prev_layout
        _layout=$(get_layout)
    else
        _layout=$((_layout + 1))
        if [ "${_layout}" -ge ${SECONDARY_LAYER} ]; then
            _layout=${PRIMARY_LAYER}
        fi
        set_layout "${_layout}"
    fi
    notify "${_layout}"
}

toggle_layers() {
    _layout=$(get_layout)
    if [ "${_layout}" -eq ${SECONDARY_LAYER} ]; then
        prev_layout
        _layout=$(get_layout)
    else
        set_layout ${SECONDARY_LAYER}
        _layout=${SECONDARY_LAYER}
    fi
    notify "${_layout}"
}

trap toggle_layouts USR1
trap toggle_layers USR2

while true; do
    sleep infinity &
    wait
    kill ${!}
done

exec --no-startup-id kbdl.sh

bindsym $mod+space exec --no-startup-id pkill -USR1 -x kbdl.sh
bindsym $mod+Shift+space exec --no-startup-id pkill -USR2 -x kbdl.sh