sway: add control-brightness.sh script

it allows to change external monitor's brightness

bin/control-brightness.sh

@@ -0,0 +1,19 @@
+#! /bin/bash
+
+active_output=$(swaymsg -p -t get_outputs | grep '(focused)' | awk '{ printf $2 }')
+
+device=""
+if [[ "$active_output" == "HDMI-A-1" ]]; then
+	device="ddcci5"
+else
+	device="amdgpu_bl0"
+fi
+
+param=""
+if [[ "$1" == "up" ]]; then
+	param="+"
+else
+	param="-"
+fi
+
+brightnessctl -d "$device" set 5%$param

config/.config/sway/config

@@ -166,8 +166,8 @@ bindsym --to-code {
   XF86AudioMicMute exec $HOME/dotfiles/bin/toggle-mic-mute.sh
 
   # brightness
-  XF86MonBrightnessDown exec brightnessctl set 5%- | sed -En 's/.*\(([0-9]+)%\).*/\1/p' > $WOBSOCK
-  XF86MonBrightnessUp exec brightnessctl set 5%+ | sed -En 's/.*\(([0-9]+)%\).*/\1/p' > $WOBSOCK
+  XF86MonBrightnessDown exec $HOME/dotfiles/bin/control-brightness.sh down | sed -En 's/.*\(([0-9]+)%\).*/\1/p' > $WOBSOCK
+  XF86MonBrightnessUp exec $HOME/dotfiles/bin/control-brightness.sh up | sed -En 's/.*\(([0-9]+)%\).*/\1/p' > $WOBSOCK
 
   # screenshots
   $mod+Shift+s exec grim -g "$(slurp)" - | swappy -f -