dotfiles/dots/.config/waybar/scripts/battery-status.sh

#!/bin/bash
# Waybar custom/battery module.
# Bar text: battery icon + capacity%. Tooltip: time remaining + performance settings.

bat=$(ls -d /sys/class/power_supply/BAT* 2>/dev/null | head -1)
[ -z "$bat" ] && { echo '{"text":"?","tooltip":"No battery found","class":"unknown"}'; exit 0; }

cap=$(cat "$bat/capacity" 2>/dev/null || echo 0)
status=$(cat "$bat/status" 2>/dev/null || echo Unknown)
ac=$(cat /sys/class/power_supply/AC/online 2>/dev/null || echo 0)

# --- charge/energy figures (this laptop reports charge_* in uAh, current_* in uA) ---
now=$(cat "$bat/charge_now"  2>/dev/null || cat "$bat/energy_now"  2>/dev/null || echo 0)
full=$(cat "$bat/charge_full" 2>/dev/null || cat "$bat/energy_full" 2>/dev/null || echo 0)
rate=$(cat "$bat/current_now" 2>/dev/null || cat "$bat/power_now"   2>/dev/null || echo 0)

# --- time remaining ---
time_str="calculating…"
if [ "$rate" -gt 0 ] 2>/dev/null; then
    if [ "$status" = "Discharging" ]; then
        secs=$(( now * 3600 / rate ))
        label="remaining"
    elif [ "$status" = "Charging" ]; then
        secs=$(( (full - now) * 3600 / rate ))
        label="until full"
    else
        secs=0; label=""
    fi
    if [ "$secs" -gt 0 ]; then
        h=$(( secs / 3600 )); m=$(( (secs % 3600) / 60 ))
        time_str="${h}h ${m}m ${label}"
    fi
fi
[ "$status" = "Full" ] && time_str="fully charged"

# --- performance settings ---
prof=$(cat /sys/firmware/acpi/platform_profile 2>/dev/null || echo "n/a")
gov=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2>/dev/null || echo "n/a")
epp=$(cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference 2>/dev/null || echo "n/a")
if [ "$ac" = "1" ]; then tlp="AC mode ⚡"; else tlp="battery mode 🔋"; fi

# --- icon by capacity (FontAwesome) ---
if   [ "$cap" -ge 90 ]; then icon=$(printf '')   # full
elif [ "$cap" -ge 65 ]; then icon=$(printf '')   # three-quarters
elif [ "$cap" -ge 40 ]; then icon=$(printf '')   # half
elif [ "$cap" -ge 15 ]; then icon=$(printf '')   # quarter
else                         icon=$(printf '')   # empty
fi
bolt=$(printf '')

if [ "$status" = "Charging" ] || [ "$ac" = "1" ]; then
    text="$bolt  $icon  ${cap}%"
else
    text="$icon  ${cap}%"
fi

# --- css class ---
class="$status"
if   [ "$cap" -le 15 ] && [ "$status" = "Discharging" ]; then class="critical discharging"
elif [ "$cap" -le 30 ] && [ "$status" = "Discharging" ]; then class="warning discharging"
fi

tooltip="Battery: ${cap}%  (${status})\n${time_str}\n\nPower profile: ${prof}\nCPU governor: ${gov}\nCPU EPP: ${epp}\nTLP: ${tlp}"

printf '{"text": "%s", "tooltip": "%s", "class": "%s", "percentage": %s}\n' "$text" "$tooltip" "$class" "$cap"