dunst: Add brightness level notifications

Added notifications on changing brightness, will stack by default to
show the current level before disappearing.

The script to change and notify can be run through the command
`control-brightness`, and is bound to the sxhkd media key shortcuts for
brightness changes.

Removed the brightness indicator from polybar since it should be easy
enough to check current brightness by doing a quick higher-lower and
that's it.

Kept the module in polybar configuration script since I might reconsider
its removal if it turns out to have been useful.

nvim/.config/nvim/spell/en.utf-8.add

@@ -95,3 +95,4 @@ transnationalism
 universalisms
 univseralism
 weaponization
+blog

polybar/.config/polybar/config

@@ -57,9 +57,9 @@ padding-left = 0
 padding-right = 0
 module-margin-left = 2
 
-modules-left = workspaces sxhkdmode pomo papersdue
+modules-left = sxhkdmode workspaces pomo papersdue
 modules-center = music date
-modules-right = networkspeed mail weather archupdates cpu temp backlight volume battery
+modules-right = networkspeed mail weather archupdates cpu temp volume battery
 ; do not use offsets for the bar, would only work with override-redirect
 ; and will mess up tray https://github.com/polybar/polybar/issues/1355
 tray-position = right
@@ -130,7 +130,7 @@ ws-icon-default = ♟
 ; Default: %icon%  %name%
 ; unfocused = Inactive workspace on any monitor
 label-unfocused = %icon%
-label-unfocused-padding = 4
+label-unfocused-padding = 2
 label-unfocused-underline = ${colors.background-alt}
 ; focused = Active workspace on focused monitor
 label-focused = %icon%
@@ -212,7 +212,7 @@ format-underline = ${colors.primary}
 [module/date]
 type = internal/date
 ; Seconds to sleep between updates
-interval = 1.0
+interval = 5.0
 ; See "http://en.cppreference.com/w/cpp/io/manip/put_time" for details on how to format the date string
 ; NOTE: if you want to use syntax tags here you need to use %%{...}
 date = %d/%m
@@ -221,8 +221,8 @@ time = %H:%M
 ; if `date-alt` or `time-alt` is defined, clicking
 ; the module will toggle between formats
 date-alt = %A, %d %B %Y (W %V)
-time-alt = %H:%M
-label = %date%%{T2}  %{T-}%time%
+time-alt = %H:%M:%S
+label = %date%%{T2} %{T-}%time%
 format-underline = ${colors.primary}
 
 ; display information on currently playing track, allows simple track manipulation
@@ -295,6 +295,7 @@ format-underline = ${colors.primary}
 [module/networkspeed]
 type = custom/script
 exec = $XDG_CONFIG_HOME/polybar/scripts/poly-networkspeed
+exec-if = type $XDG_CONFIG_HOME/polybar/scripts/poly-networkspeed
 tail = true
 format-underline = ${colors.primary}
 

scripts/.local/bin/control-brightness

@@ -0,0 +1,55 @@
+#!/usr/bin/env sh
+# Brightness control script using xbacklight
+# Will use notify-send to create brightness notifications, if dunst is used
+# or the notification daemon supports tag stacks, will automatically update
+# the same notifications and not create new ones.
+#
+# inspired from https://gist.github.com/Blaradox/030f06d165a82583ae817ee954438f2e
+
+usage() {
+  echo "usage: control-brightness up|down [step], where step can be any int value
+or:     control-brightness set target, where target can be an int value 0-100"
+}
+
+direction=$1
+step=${2:-10}
+
+get_brightness() {
+  xbacklight -get | cut -d. -f1
+}
+
+send_notification() {
+  icon="preferences-system-brightness-lock"
+  brightness=$(get_brightness)
+  # Make the bar with the special character ─ (it's not dash -)
+  # https://en.wikipedia.org/wiki/Box-drawing_character
+  bar=$(seq -s "─" 0 $((brightness / 5)) | sed 's/[0-9]//g' |
+    sed -e 's/^─/┠/' -e 's/^\(.\{20\}\)/\1┫/')
+  if type dunstify 1>/dev/null 2>/dev/null; then
+    dunstify -i "$icon" -u normal "    $bar" -a "xbacklight" -h string:x-dunst-stack-tag:brightness
+  else
+    notify-send -i "$icon" -u normal "    $bar" -a "xbacklight" -h string:x-dunst-stack-tag:brightness
+  fi
+}
+
+case $direction in
+up)
+  xbacklight -inc "$step"
+  send_notification
+  ;;
+down)
+  xbacklight -dec "$step"
+  send_notification
+  ;;
+set)
+  if [ -z "$step" ]; then
+    echo "set option requires target brightness to be specified."
+    return 1
+  fi
+  xbacklight -set "$step"
+  send_notification
+  ;;
+*)
+  echo "usage: control-brightness up|down [step], where step can be any int value"
+  ;;
+esac

sxhkd/.config/sxhkd/sxhkdrc

@@ -19,7 +19,7 @@ super + F7
 
 # enable function (/media) key functionality
 XF86MonBrightness{Up,Down}
-  xbacklight {-inc,-dec} 10
+  control-brightness {up, down} 10
 XF86AudioMute
   pavolume mutetoggle
 XF86Audio{LowerVolume,RaiseVolume}