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/*
* Copyright (C) 2017 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* 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
* 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 common
import (
"errors"
"io/ioutil"
"path/filepath"
"strconv"
"strings"
)
type Controller struct {
Path string
Name string
MaxBrightness int
}
var errMaxBrightnessIsZero = errors.New("max brightness of controller is zero")
func NewController(path string) (*Controller, error) {
c := &Controller{
Path: path,
Name: filepath.Base(path),
}
var err error
c.MaxBrightness, err = c.GetPropInt("max_brightness")
if err != nil {
return nil, err
}
if c.MaxBrightness == 0 {
return nil, errMaxBrightnessIsZero
}
return c, nil
}
func (c *Controller) GetBrightness() (int, error) {
brightness, err := c.GetPropInt("brightness")
if err != nil {
return 0, err
}
return brightness, nil
}
func (c *Controller) GetPropBytes(name string) ([]byte, error) {
filename := filepath.Join(c.Path, name)
contents, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return contents, nil
}
func (c *Controller) GetPropString(name string) (string, error) {
bytes, err := c.GetPropBytes(name)
if err != nil {
return "", err
}
return string(bytes), nil
}
func (c *Controller) GetPropInt(name string) (int, error) {
str, err := c.GetPropString(name)
if err != nil {
return 0, err
}
num, err := strconv.Atoi(strings.TrimSpace(str))
if err != nil {
return 0, err
}
return num, nil
}
func ListControllerPaths(dir string) ([]string, error) {
fileInfos, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}
paths := make([]string, len(fileInfos))
for i, fileInfo := range fileInfos {
paths[i] = filepath.Join(dir, fileInfo.Name())
}
return paths, nil
}
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