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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package i3status
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
)
const (
batteryFullPath = "/sys/class/power_supply/BAT0/energy_full"
batteryNowPath = "/sys/class/power_supply/BAT0/energy_now"
powerNowPath = "/sys/class/power_supply/BAT0/power_now"
)
func getBatteryStatus() []Block {
//TODO: What's with /sys/class/power_supply/BAT0/uevent? Can this be used to
//remove all the polling overhead here?
energyFull, err := readNumberFromFile(batteryFullPath)
if err != nil {
return nil
}
energyNow, err := readNumberFromFile(batteryNowPath)
if err != nil {
return nil
}
powerNow, err := readNumberFromFile(powerNowPath)
if err != nil {
return nil
}
energyPerc := energyNow * 100 / energyFull
charging := powerNow == 0 //i.e. when we're not drawing power from the battery
color := "#AAAA00"
if charging {
color = "#00AA00"
} else if energyPerc < 10 {
color = "#AA0000"
}
return section("bat", Block{
Name: "battery",
Position: PositionBattery,
FullText: fmt.Sprintf("%d%%", energyPerc),
Urgent: energyPerc < 10 && !charging,
Color: color,
})
}
func readNumberFromFile(path string) (int64, error) {
buf, err := ioutil.ReadFile(path)
if err != nil {
return 0, err
}
return strconv.ParseInt(strings.TrimSpace(string(buf)), 0, 64)
}
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