98 lines
2.4 KiB
Plaintext
Executable File
98 lines
2.4 KiB
Plaintext
Executable File
#!/usr/bin/env nix-shell
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#!nix-shell -i bash
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usage() {
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echo "usage: battery_estimate [options...]"
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echo
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echo "pretty-prints a battery estimate (icon to indicate state, and a duration estimate)"
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echo
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echo "options:"
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echo " --debug: output additional information, to stderr"
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}
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# these icons come from sxmo; they only render in nerdfonts
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bat_dis=""
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bat_chg=""
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log() {
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if [ "$BATTERY_ESTIMATE_DEBUG" = "1" ]; then
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printf "$@" >&2
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echo >&2
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fi
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}
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try_path() {
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# returns:
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# - perc, perc_left (0-100)
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# - full, rate (pos means charging)
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if [ -f "$1/capacity" ]; then
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log "perc, perc_left from %s" "$1/capacity"
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perc=$(cat "$1/capacity")
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perc_left=$((100 - $perc))
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fi
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if [ -f "$1/charge_full_design" ] && [ -f "$1/current_now" ]; then
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log "full, rate from %s and %s" "$1/charge_full_design" "$1/current_now"
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# current is positive when charging
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full=$(cat "$1/charge_full_design")
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rate=$(cat "$1/current_now")
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fi
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if [ -f "$1/energy_full" ] && [ -f "$1/energy_now" ]; then
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log "full, rate from %s and %s" "$1/energy_full" "$1/energy_now"
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# energy is positive when discharging
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full=$(cat "$1/energy_full")
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rate=-$(cat "$1/energy_now")
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fi
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}
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try_all_paths() {
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try_path "/sys/class/power_supply/axp20x-battery" # Pinephone
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try_path "/sys/class/power_supply/BAT0" # Thinkpad
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log "perc: %d, left: %d" "$perc" "$perc_left"
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log "full: %f, rate: %f" "$full" "$rate"
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log " rate > 0 means charging, else discharging"
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}
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fmt_minutes() {
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log "charge/discharge time: %f min" "$3"
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# args: <battery symbol> <text if ludicrous estimate> <estimated minutes to full/empty>
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if [[ $3 -gt 1440 ]]; then
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log "charge/discharge duration > 1d"
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printf "%s %s" "$1" "$2" # more than 1d
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else
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hr=$(($3 / 60))
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hr_in_min=$(($hr * 60))
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min=$(($3 - $hr_in_min))
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printf "%s %dh%02dm" "$1" "$hr" "$min"
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fi
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}
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pretty_output() {
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if [[ $rate -lt 0 ]]; then
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log "discharging"
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fmt_minutes "$bat_dis" '∞' "$(($full * 60 * $perc / (-100 * $rate)))"
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elif [[ $rate -gt 0 ]]; then
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log "charging"
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fmt_minutes "$bat_chg" '100%' "$(($full * 60 * $perc_left / (100 * $rate)))"
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elif [[ "$perc" != "" ]]; then
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log "neither charging nor discharging"
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echo "$bat_dis $perc%"
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fi
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}
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while [ "$#" -gt 0 ]; do
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case "$1" in
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"--debug")
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shift
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BATTERY_ESTIMATE_DEBUG=1
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;;
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*)
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usage
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exit 1
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;;
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esac
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done
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try_all_paths
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pretty_output
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