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#!/bin/sh
# Battery status display script for systems with /sys/class/power_supply
SYS_BASE="/sys/class/power_supply"
# Read battery energy values
# Returns: "energy_now energy_full" or exits with error
read_battery() {
bat="$1"
base="$SYS_BASE/$bat"
[ -r "$base/energy_now" ] || return 1
[ -r "$base/energy_full" ] || return 1
energy_now=$(cat "$base/energy_now" 2>/dev/null) || return 1
energy_full=$(cat "$base/energy_full" 2>/dev/null) || return 1
# Validate numeric values
case "$energy_now" in
''|*[!0-9]*) return 1 ;;
esac
case "$energy_full" in
''|*[!0-9]*) return 1 ;;
esac
echo "$energy_now $energy_full"
}
# Determine battery state symbol based on status of all batteries
battery_state_symbol() {
charging=0
discharging=0
full=0
not_charging=0
bat_found=0
for bat in BAT0 BAT1; do
status_path="$SYS_BASE/$bat/status"
[ -r "$status_path" ] || continue
bat_found=1
status=$(cat "$status_path" 2>/dev/null | tr -d '\n')
case "$status" in
Charging)
charging=1
;;
Discharging)
discharging=1
;;
Full)
full=1
;;
"Not charging")
not_charging=1
;;
esac
done
# No batteries found
[ "$bat_found" -eq 0 ] && echo " " && return 1
# Priority: charging > discharging > not_charging > full
# If any battery is charging, show charging
[ "$charging" -eq 1 ] && echo "⁺" && return 0
# If any battery is discharging, show discharging
[ "$discharging" -eq 1 ] && echo "⁻" && return 0
# If any battery is not charging (plugged but not charging)
[ "$not_charging" -eq 1 ] && echo "˜" && return 0
# All batteries full
[ "$full" -eq 1 ] && echo "=" && return 0
# Unknown status
echo " "
return 1
}
battery_bar() {
percent="$1"
[ "$percent" -lt 0 ] && percent=0
[ "$percent" -gt 100 ] && percent=100
filled=$((percent / 10))
empty=$((10 - filled))
bar=""
i=0
while [ "$i" -lt "$filled" ]; do
bar="${bar}█"
i=$((i + 1))
done
i=0
while [ "$i" -lt "$empty" ]; do
bar="${bar}░"
i=$((i + 1))
done
echo "$bar"
}
battery_summary() {
total_now=0
total_full=0
bat_count=0
for bat in BAT0 BAT1; do
vals=$(read_battery "$bat") || continue
set -- $vals
total_now=$((total_now + $1))
total_full=$((total_full + $2))
bat_count=$((bat_count + 1))
done
if [ "$bat_count" -eq 0 ] || [ "$total_full" -eq 0 ]; then
echo "No battery"
return 1
fi
percent=$(( (total_now * 100 + total_full / 2) / total_full ))
bar=$(battery_bar "$percent")
symbol=$(battery_state_symbol)
echo "▕${bar}▏${percent}${symbol}"
}
battery_summary
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