55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
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#!/bin/sh
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POLLING_FREQUENCY=1
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# ISO 8601
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alias date="date '+%Y-%m-%dT%T'"
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emit() {
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printf "[%s] " "$(date)"
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echo "$@"
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}
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get_current_level() {
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# adapted from other script i wrote, also in the public domain
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if [ "$(uname)" = "Linux" ]; then
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# this is a dirty hack.
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# acpi | awk '{print $4}' will print the battery percentage,
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# and s/,$// strips the trailing comma.
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# acpi -a will just print the power adapter status.
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printf "%b" "$(acpi | awk '{print $4}' | sed 's/,$//')"
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return 0
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elif [ "$(uname)" = "NetBSD" ]; then
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printf "%b" "$(envstat -s acpibat0:charge \
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| sed 1,2d \
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| cut -d ':' -f 2 \
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| awk '{print $1}' \
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| cut -d '.' -f 1)"
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return 0
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else
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printf "get_battery_status: unsupported OS" >>/dev/stderr
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return 1
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fi
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}
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! get_current_level >/dev/null \
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&& printf "Unable to get battery status on this system.\n" >>/dev/stderr \
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&& exit 1 \
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|| true
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current_level=$(get_current_level)
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previous_level=$current_level
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emit "$(printf "Current level: %d%%" "$current_level")"
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while true; do
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current_level=$(get_current_level)
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if ! [ $current_level -eq $previous_level ]; then
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[ $current_level -lt $previous_level ] \
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&& emit "$(printf "Discharged: %d%% -> %d%%\n" $previous_level $current_level )" \
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|| emit "$(printf " Charged: %d%% -> %d%%\n" $previous_level $current_level )"
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previous_level=$current_level
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fi
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sleep $POLLING_FREQUENCY
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done
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