add backlight support

README.md

@@ -31,10 +31,10 @@ storage     df
 - [x] audio
 - [x] fix audio not changing on mute
 - [x] cpu
+- [x] brightness
 - [ ] swap
 - [ ] wifi/ethernet/bluetooth
 - [ ] external storage with mount
 - [ ] ethernet bandwith
-- [ ] brightness
 - [ ] microphone
 - [ ] nice icons as labels

backlight

@@ -0,0 +1,12 @@
+#!/bin/bash
+DIR="/sys/class/backlight/"
+if [[ -d "${DIR}acpi_video0" ]]; then
+   DIR="${DIR}acpi_video0"
+elif [[ -d "${DIR}intel_backlight" ]]; then
+   DIR="${DIR}intel_backlight"
+fi
+cat "${DIR}/brightness" "${DIR}/max_brightness" | gawk '
+    NR==1 { cbr=$1 }
+    NR==2 { mbr=$1 }
+    END { printf("%d%", cbr/mbr*100) }
+'

config

@@ -5,6 +5,10 @@ separator=false
 command=$HOME/.config/i3blocks/$BLOCK_NAME
 interval=5
 
+[backlight]
+label=backlight
+interval=2
+
 [storage]
 label=storage