power menu, redshift, polybar

.config/polybar/scripts/battery-combined-udev/95-battery.rules

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+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", \
+    RUN+="/home/user/.config/polybar/battery-combined-udev.sh --update"
+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", \
+    RUN+="/home/user/.config/polybar/battery-combined-udev.sh --update"

.config/polybar/scripts/battery-combined-udev/README.md

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+# Script: battery-combined-udev
+
+A shell script that shows the battery status. This is an extended version of [battery-combined-shell](../battery-combined-shell).
+
+It supports two rechargeable batteries and changing icons. It works even if only one battery is used.
+
+This script is able to display power supply changes in real time. For this udev is being used.
+
+
+## Configuration
+
+Copy `95-battery.rules` to `/etc/udev/rules.d/95-battery.rules`. Make sure that the paths in the file have been modified properly.
+
+
+## Module
+
+```ini
+[module/battery-combined-udev]
+type = custom/script
+exec = ~/polybar-scripts/battery-combined-udev.sh
+tail = true
+```

.config/polybar/scripts/battery-combined-udev/battery-combined-udev.sh

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+#!/bin/sh
+
+battery_print() {
+    PATH_AC="/sys/class/power_supply/AC"
+    PATH_BATTERY_0="/sys/class/power_supply/BAT0"
+    PATH_BATTERY_1="/sys/class/power_supply/BAT1"
+
+    ac=0
+    battery_level_0=0
+    battery_level_1=0
+    battery_max_0=0
+    battery_max_1=0
+
+    if [ -f "$PATH_AC/online" ]; then
+        ac=$(cat "$PATH_AC/online")
+    fi
+
+    if [ -f "$PATH_BATTERY_0/energy_now" ]; then
+        battery_level_0=$(cat "$PATH_BATTERY_0/energy_now")
+    fi
+
+    if [ -f "$PATH_BATTERY_0/energy_full" ]; then
+        battery_max_0=$(cat "$PATH_BATTERY_0/energy_full")
+    fi
+
+    if [ -f "$PATH_BATTERY_1/energy_now" ]; then
+        battery_level_1=$(cat "$PATH_BATTERY_1/energy_now")
+    fi
+
+    if [ -f "$PATH_BATTERY_1/energy_full" ]; then
+        battery_max_1=$(cat "$PATH_BATTERY_1/energy_full")
+    fi
+
+    battery_level=$(("$battery_level_0 + $battery_level_1"))
+    battery_max=$(("$battery_max_0 + $battery_max_1"))
+
+    battery_percent=$(("$battery_level * 100"))
+    battery_percent=$(("$battery_percent / $battery_max"))
+
+    if [ "$ac" -eq 1 ]; then
+        icon="#1"
+
+        if [ "$battery_percent" -gt 97 ]; then
+            echo "$icon"
+        else
+            echo "$icon $battery_percent %"
+        fi
+    else
+        if [ "$battery_percent" -gt 85 ]; then
+            icon="#21"
+        elif [ "$battery_percent" -gt 60 ]; then
+            icon="#22"
+        elif [ "$battery_percent" -gt 35 ]; then
+            icon="#23"
+        elif [ "$battery_percent" -gt 10 ]; then
+            icon="#24"
+        else
+            icon="#25"
+        fi
+
+        echo "$icon $battery_percent %"
+    fi
+}
+
+path_pid="/tmp/polybar-battery-combined-udev.pid"
+
+case "$1" in
+    --update)
+        pid=$(cat $path_pid)
+
+        if [ "$pid" != "" ]; then
+            kill -10 "$pid"
+        fi
+        ;;
+    *)
+        echo $$ > $path_pid
+
+        trap exit INT
+        trap "echo" USR1
+
+        while true; do
+            battery_print
+
+            sleep 30 &
+            wait
+        done
+        ;;
+esac