Add brightness block

i3/blocks/brightness

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# One of the following: xrandr, xbacklight, kernel
+METHOD="xbacklight"
+
+# Left click
+if [[ "${BLOCK_BUTTON}" -eq 1 ]]; then
+  xbacklight -inc 10
+# Right click
+elif [[ "${BLOCK_BUTTON}" -eq 3 ]]; then
+  xbacklight -dec 10
+fi
+
+URGENT_VALUE=10
+
+if [[ "${METHOD}" = "xrandr" ]]; then
+  device="${BLOCK_INSTANCE:-primary}"
+  xrandrOutput=$(xrandr --verbose)
+
+  if [[ "${device}" = "primary" ]]; then
+    device=$(echo "${xrandrOutput}" | grep 'primary' | head -n 1 | awk -F ' ' '{print $1}')
+  fi
+
+  curBrightness=$(echo "${xrandrOutput}" | grep "${device}" -A 5 | grep -i "Brightness" | awk -F ':' '{print $2}')
+elif [[ "${METHOD}" = "kernel" ]]; then
+  device="${BLOCK_INSTANCE:-intel_backlight}"
+  maxBrightness=$(cat /sys/class/backlight/${device}/max_brightness)
+  curBrightness=$(cat /sys/class/backlight/${device}/brightness)
+elif [[ "${METHOD}" = "xbacklight" ]]; then
+  curBrightness=$(xbacklight -get)
+fi
+
+if [[ "${curBrightness}" -le 0 ]]; then
+  exit
+fi
+
+if [[ "${METHOD}" = "xrandr" ]]; then
+  percent=$(echo "scale=0;${curBrightness} * 100" | bc -l)
+elif [[ "${METHOD}" = "kernel" ]]; then
+  percent=$(echo "scale=0;${curBrightness} / ${maxBrightness} * 100" | bc -l)
+elif [[ "${METHOD}" = "xbacklight" ]]; then
+  percent=$(echo "scale=0;${curBrightness}" | bc -l)
+fi
+
+percent=${percent%.*}
+
+if [[ "${percent}" -le 0 ]]; then
+  exit
+fi
+
+echo "🔆${percent}%"
+echo "${percent}%"
+echo ""
+
+if [[ "${percent}" -le "${URGENT_VALUE}" ]]; then
+  exit 33
+fi

i3/i3blocks.conf

@@ -95,6 +95,10 @@ instance=Master
 interval=once
 signal=10
 
+[brightness]
+command=~/.dotfiles/i3/blocks/brightness
+interval=once
+
 # Memory usage
 #
 # The type defaults to "mem" if the instance is not specified.