Init

Makefile

@@ -0,0 +1,43 @@
+SUDO ?= sudo
+
+LIB ?= /usr/lib/battery-status
+SYSTEMD_PATH ?= /usr/lib/systemd/system
+
+LIB_FILES := battery-common-lib.sh battery-low-alert.sh battery-status-toggle.sh
+LIB_TARGETS := $(addprefix $(LIB)/,$(LIB_FILES))
+
+SYSTEMD_FILES := battery-status-toggle.service battery-status-toggle.path
+SYSTEMD_TARGETS := $(addprefix $(SYSTEMD_PATH)/,$(SYSTEMD_FILES))
+
+$(LIB):
+	mkdir $@
+
+$(LIB)/battery-common-lib.sh:
+	$(SUDO) cp ./battery-common-lib.sh $@
+
+$(LIB)/battery-low-alert.sh:
+	$(SUDO) cp ./battery-low-alert.sh $@
+
+$(LIB)/battery-status-toggle.sh:
+	$(SUDO) cp ./battery-status-toggle.sh $@
+
+./battery-status-toggle.service:
+	PREFIX=$(SYSTEMD_PATH) ./battery-status-toggle.service.template
+
+$(SYSTEMD_PATH)/battery-status-toggle.service: ./battery-status-toggle.service
+	$(SUDO) cp ./battery-status-toggle.service $@
+
+$(SYSTEMD_PATH)/battery-status-toggle.path:
+	$(SUDO) cp ./battery-status-toggle.path $@
+
+install: $(LIB_TARGETS) $(SYSTEMD_TARGETS)
+	$(SUDO) systemctl daemon-reload
+
+enable: install
+	$(SUDO) systemctl enable --now battery-status-toggle.path
+
+clean:
+	$(SUDO) rm -f $(SYSTEMD_TARGETS) $(LIB_TARGETS)
+	rm -f ./battery-status-toggle.service
+
+.PHONY: install enable clean

battery-common-lib.sh

@@ -0,0 +1,29 @@
+bat_files="/sys/class/power_supply/BAT0"
+bat_status=$(cat ${bat_files}/status)
+capacity=$(cat "${bat_files}/capacity")
+
+function set_capacity() {
+    if [[ ${capacity} -lt 10 ]]; then
+        cap=0
+    elif [[ ${capacity} -lt 20 ]]; then
+        cap=10
+    elif [[ ${capacity} -lt 30 ]]; then
+        cap=20
+    elif [[ ${capacity} -lt 40 ]]; then
+        cap=30
+    elif [[ ${capacity} -lt 50 ]]; then
+        cap=40
+    elif [[ ${capacity} -lt 60 ]]; then
+        cap=50
+    elif [[ ${capacity} -lt 70 ]]; then
+        cap=60
+    elif [[ ${capacity} -lt 80 ]]; then
+        cap=70
+    elif [[ ${capacity} -lt 90 ]]; then
+        cap=80
+    elif [[ ${capacity} -lt 100 ]]; then
+        cap=90
+    else
+        cap=100
+    fi
+}

battery-low-alert.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+source ./battery-common-lib.sh
+
+set_capacity
+
+if [[ "${bat_status}"=="Discharging" ]]; then
+    notify-send \
+        --icon="/usr/share/icons/Adwaita/64x64/status/battery-level-${cap}-symbolic.symbolic.png" \
+        "Discharging" \
+        "AC disconnected"
+elif [[ "${bat_status}"=="Charging" ]]; then
+    notify-send \
+        --icon="/usr/share/icons/Adwaita/64x64/status/battery-level-${cap}-charged-symbolic.symbolic.png" \
+        "Discharging" \
+        "AC disconnected"
+fi

battery-status-toggle.path

@@ -0,0 +1,5 @@
+[Unit]
+Description=React to battery status change
+
+[Path]
+PathModified=/sys/class/power_supply/BAT0

battery-status-toggle.service.template

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+cat > battery-status-toggle.service << EOU
+[Unit]
+Description=Notify when battery status changes
+
+[Service]
+Type=oneshot
+ExecStart=${PREFIX}/battery-status-toggle.sh
+EOU

battery-status-toggle.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+source ./battery-common-lib.sh
+
+set_capacity
+
+if [[ ${bat_status}=="Discharging" && ${capacity} -le 10 ]]; then
+    echo "Battery alert - ${capacity}%"
+    notify-send \
+        --icon="/usr/share/icons/Adwaita/64x64/status/battery-level-${cap}-symbolic.symbolic.png" \
+        "Critical battery" \
+        "Only ${capacity}% battery remaining"
+elif [[ ${bat_status}=="Discharging" && ${capacity} -le 20 ]]; then
+    echo "Battery alert - ${capacity}%"
+    notify-send \
+        --icon="/usr/share/icons/Adwaita/64x64/status/battery-level-${cap}-symbolic.symbolic.png" \
+        "Low battery" \
+        "Only ${capacity}% battery remaining"
+fi