Switch keyboard layout by clicking the xmobar indicator

Left-click cycles it -> us -> sk(qwerty), right-click cycles backwards, via a
new kbd_cycle.sh that calls setxkbmap like the M-i/M-u/M-s keys.

.config/xmobar/kbd_cycle.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Cycle keyboard layout it -> us -> sk(qwerty); "prev" cycles backwards.
+
+current=$(setxkbmap -query | awk '/^layout:/ {split($2, a, ","); print a[1]}')
+
+if [[ "$1" == "prev" ]]; then
+    case "$current" in
+        it) next=sk ;;
+        us) next=it ;;
+        *) next=us ;;
+    esac
+else
+    case "$current" in
+        it) next=us ;;
+        us) next=sk ;;
+        *) next=it ;;
+    esac
+fi
+
+if [[ "$next" == "sk" ]]; then
+    setxkbmap -layout sk -variant qwerty
+else
+    setxkbmap -layout "$next" -variant ""
+fi

.config/xmobar/xmobarrc_hdmi

@@ -57,5 +57,5 @@ Config { overrideRedirect   = True
                               ]
         , sepChar           = "%"
         , alignSep          = "}{"
-        , template          = "  | %UnsafeXMonadLog% } %uptime% | %multicpu% %coretemp% | %memory% |   %kbd% { <action=`/home/fuxino/.config/xmobar/backup.sh list`>%backup%</action><action=`/home/fuxino/.config/xmobar/updates.sh list`>%updates%</action><action=`/home/fuxino/.config/xmobar/ens_brief.sh week`>%LZIB% <fc=#565f89>·</fc> %ens_brief%</action> | %pactl_volume% | %date% "
+        , template          = "  | %UnsafeXMonadLog% } %uptime% | %multicpu% %coretemp% | %memory% | <action=`/home/fuxino/.config/xmobar/kbd_cycle.sh` button=1><action=`/home/fuxino/.config/xmobar/kbd_cycle.sh prev` button=3>  %kbd%</action></action> { <action=`/home/fuxino/.config/xmobar/backup.sh list`>%backup%</action><action=`/home/fuxino/.config/xmobar/updates.sh list`>%updates%</action><action=`/home/fuxino/.config/xmobar/ens_brief.sh week`>%LZIB% <fc=#565f89>·</fc> %ens_brief%</action> | %pactl_volume% | %date% "
         }

.config/xmobar/xmobarrc_laptop

@@ -58,5 +58,5 @@ Config { overrideRedirect   = True
                               ]
         , sepChar           = "%"
         , alignSep          = "}{"
-        , template          = "  | %UnsafeXMonadLog% } %uptime% | %multicpu% %coretemp% | %memory% |   %kbd% { <action=`/home/fuxino/.config/xmobar/backup.sh list`>%backup%</action><action=`/home/fuxino/.config/xmobar/updates.sh list`>%updates%</action><action=`/home/fuxino/.config/xmobar/ens_brief.sh week`>%LZIB% <fc=#565f89>·</fc> %ens_brief%</action> | %pactl_volume% | %date% %_XMONAD_TRAYPAD% "
+        , template          = "  | %UnsafeXMonadLog% } %uptime% | %multicpu% %coretemp% | %memory% | <action=`/home/fuxino/.config/xmobar/kbd_cycle.sh` button=1><action=`/home/fuxino/.config/xmobar/kbd_cycle.sh prev` button=3>  %kbd%</action></action> { <action=`/home/fuxino/.config/xmobar/backup.sh list`>%backup%</action><action=`/home/fuxino/.config/xmobar/updates.sh list`>%updates%</action><action=`/home/fuxino/.config/xmobar/ens_brief.sh week`>%LZIB% <fc=#565f89>·</fc> %ens_brief%</action> | %pactl_volume% | %date% %_XMONAD_TRAYPAD% "
         }