niceties

niceties/batterymonitor

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+POLLING_FREQUENCY=1
+
+# ISO 8601
+alias date="date '+%Y-%m-%dT%T'"
+
+emit() {
+	printf "[%s] " "$(date)"
+	echo "$@"
+}
+
+! battery >/dev/null 2>&1 \
+	&& printf "Unable to get battery status on this system.\n" 1>&2 \
+	&& exit 1 \
+	|| true
+
+current_level=$(battery)
+previous_level=$current_level
+
+emit "$(printf "Current level: %d%%" "$current_level")"
+
+while true; do
+	current_level=$(battery)
+	if ! streq $current_level $previous_level; then
+		[ $current_level -lt $previous_level ] \
+			&& emit "$(printf "Discharged: %d%% -> %d%%\n" $previous_level $current_level )" \
+			|| emit "$(printf "   Charged: %d%% -> %d%%\n" $previous_level $current_level )"
+		previous_level=$current_level
+	fi
+
+	sleep $POLLING_FREQUENCY
+done