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/**
* adjbacklight – Convient method for adjusting the backlight on your portable computer
*
* Copyright © 2012, 2013, 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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/>.
*/
import java.io.*;
import java.util.*;
/**
* Interactive backlight adjustment
*
* @author Mattias Andrée, <a href="mailto:maandree@member.fsf.org">maandree@member.fsf.org</a>
*/
public class Adjbacklight
{
/**
* The is the main entry point of the program
*
* @param args Expects the three values: terminal height, terminal width, backlight device
* @throws IOException On error
*/
public static void main(final String... args) throws IOException
{
String dir = "/sys/class/backlight/" + args[2] + "/";
int width = Integer.parseInt(args[1]);
int max = 0, min = 0, cur = 0;
{ InputStream is = null;
try
{ is = new FileInputStream(dir + "brightness");
Scanner sc = new Scanner(is);
cur = Integer.parseInt(sc.nextLine());
}
finally
{ if (is != null)
is.close();
}
}
{ InputStream is = null;
try
{ is = new FileInputStream(dir + "max_brightness");
Scanner sc = new Scanner(is);
max = Integer.parseInt(sc.nextLine());
}
finally
{ if (is != null)
is.close();
}
}
if (max <= min)
System.exit(127);
int step = (max - min) / 200;
int init = cur;
if (step == 0)
step = 1;
System.out.print("\n\n\n\n\n\n");
print(min, max, init, cur, width);
for (int d; (d = System.in.read()) != -1;)
switch (d)
{
case 'q':
case '\n':
case 4:
System.out.println();
return;
case 'A':
case 'C': cur += step << 1;
case 'B':
case 'D': cur -= step;
if (cur < min) cur = min;
if (cur > max) cur = max;
{ OutputStream os = null;
try
{ os = new FileOutputStream(dir + "brightness");
os.write((cur + "\n").getBytes("UTF-8"));
os.flush();
print(min, max, init, cur, width);
}
finally
{ if (os != null)
os.close();
}
}
break;
}
}
/**
* Print the status
*
* @param min The minimum possible brightness
* @param max The maximum possible brightness
* @param init The brightness used when the program started
* @param cur The current brightness
* @param width The width of the terminal
*/
private static void print(int min, int max, int init, int cur, int width)
{
String line = "──────────────────────────────────";
while (line.length() < width - 2)
line += line;
line = line.substring(0, width - 2);
String space = " ";
while (space.length() < width - 2)
space += space;
space = space.substring(0, width - 2);
int mid = (int)((cur - min) * (width - 2.) / (max - min) + 0.5);
System.out.print("\033[1000D\033[6A");
System.out.println("\033[2K┌" + line + "┐");
System.out.println("\033[2K│\033[47m" + space.substring(0, mid) + "\033[49m" + space.substring(mid) + "│");
System.out.println("\033[2K└" + line + "┘");
System.out.println("\033[2KMaximum brightness: " + max);
System.out.println("\033[2KInitial brightness: " + init);
System.out.println("\033[2KCurrent brightness: " + cur);
}
}
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