54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
 
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//go:build linux
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package main
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import (
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"os"
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"path/filepath"
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"strings"
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)
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const powerSupplyRoot = "/sys/class/power_supply"
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func systemBattery() (bool, error) {
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return sysfsOnBattery(powerSupplyRoot)
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}
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func readSupplyField(dir, name string) string {
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data, err := os.ReadFile(filepath.Join(dir, name))
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if err != nil {
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return ""
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}
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return strings.TrimSpace(string(data))
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}
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func isMainsType(kind string) bool {
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return kind == "Mains" || kind == "ADP" || strings.HasPrefix(kind, "USB")
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}
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func sysfsOnBattery(root string) (bool, error) {
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entries, err := os.ReadDir(root)
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if err != nil {
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return false, err
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}
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discharging := false
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for _, entry := range entries {
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dir := filepath.Join(root, entry.Name())
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if readSupplyField(dir, "scope") == "Device" {
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continue
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}
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kind := readSupplyField(dir, "type")
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switch {
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case kind == "Battery":
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if readSupplyField(dir, "status") == "Discharging" {
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discharging = true
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}
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case isMainsType(kind):
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if readSupplyField(dir, "online") == "1" {
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return false, nil
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}
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}
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}
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return discharging, nil
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}
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