os/pkgs/toggle-kbd-layout.nix

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self:
with self; ''
set -e
current_layout=$(${sway}/bin/swaymsg -t get_inputs | ${jq}/bin/jq -r '.[] | select(.type == "keyboard") | .xkb_active_layout_index' | head -1)
total_layouts=$(${sway}/bin/swaymsg -t get_inputs | ${jq}/bin/jq -r '.[] | select(.type == "keyboard") | .xkb_layout_names | length' | head -1)
next_layout_index=$(expr $current_layout + 1);
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if [ $next_layout_index -ge $total_layouts ]; then
next_layout_index=0;
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fi
${sway}/bin/swaymsg input '*' xkb_switch_layout "$next_layout_index"
echo $next_layout_index
next_layout=$(${sway}/bin/swaymsg -t get_inputs | ${jq}/bin/jq -r "[ .[] | select(.type == \"keyboard\") | .xkb_layout_names ][0].[$next_layout_index]")
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${libnotify}/bin/notify-send "$next_layout"
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''