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// battery
// Copyright (C) 2016-2017 Karol 'Kenji Takahashi' Woźniak
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package battery
import (
"math"
"os/exec"
plist "howett.net/plist"
)
type battery struct {
Voltage int
CurrentCapacity int
MaxCapacity int
DesignCapacity int
Amperage int64
FullyCharged bool
IsCharging bool
ExternalConnected bool
}
func readBatteries() ([]*battery, error) {
out, err := exec.Command("ioreg", "-n", "AppleSmartBattery", "-r", "-a").Output()
if err != nil {
return nil, err
}
if len(out) == 0 {
// No batteries.
return nil, nil
}
var data []*battery
if _, err = plist.Unmarshal(out, &data); err != nil {
return nil, err
}
return data, nil
}
func convertBattery(battery *battery) *Battery {
volts := float64(battery.Voltage) / 1000
b := &Battery{
Current: float64(battery.CurrentCapacity) * volts,
Full: float64(battery.MaxCapacity) * volts,
Design: float64(battery.DesignCapacity) * volts,
ChargeRate: math.Abs(float64(battery.Amperage)) * volts,
Voltage: volts,
DesignVoltage: volts,
}
switch {
case !battery.ExternalConnected:
b.State, _ = newState("Discharging")
case battery.IsCharging:
b.State, _ = newState("Charging")
case battery.CurrentCapacity == 0:
b.State, _ = newState("Empty")
case battery.FullyCharged:
b.State, _ = newState("Full")
default:
b.State, _ = newState("Unknown")
}
return b
}
func systemGet(idx int) (*Battery, error) {
batteries, err := readBatteries()
if err != nil {
return nil, err
}
if idx >= len(batteries) {
return nil, ErrNotFound
}
return convertBattery(batteries[idx]), nil
}
func systemGetAll() ([]*Battery, error) {
_batteries, err := readBatteries()
if err != nil {
return nil, err
}
batteries := make([]*Battery, len(_batteries))
for i, battery := range _batteries {
batteries[i] = convertBattery(battery)
}
return batteries, nil
}
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