From 31a2df51b78736da677fc61f9a09a93579cbdb7a Mon Sep 17 00:00:00 2001
From: Jesse Smith <jessefrgsmith@yahoo.ca>
Date: Sat, 6 Sep 2014 17:28:06 -0300
Subject: Added audio volume control to Linux. Added initial code for changing
 screen brightness on Linux and updated dependnecy list. Added template file
 for future operating system support.

---
 DEPENDENCIES                 |  3 +++
 libLumina/LuminaOS-Linux.cpp | 62 +++++++++++++++++++++++++++++++++++++++-----
 libLumina/libLumina.pro      |  1 +
 3 files changed, 60 insertions(+), 6 deletions(-)

diff --git a/DEPENDENCIES b/DEPENDENCIES
index 540831ee..0b3c7cf2 100644
--- a/DEPENDENCIES
+++ b/DEPENDENCIES
@@ -24,6 +24,9 @@ numlockx (x11/numlockx)
   libqt4-svg
   libxcomposite-dev
 
+  Optional Debian/Ubuntu/Mint packages
+  xbacklight (required for changing screen brightness)
+
 === BUILD & RUN ===
 Qt 4.8+ (modules: core, gui, network, linguist, svg)
   also includes: (qt4-qmake, qt4-uic, qt4-moc, qt4-rcc)
diff --git a/libLumina/LuminaOS-Linux.cpp b/libLumina/LuminaOS-Linux.cpp
index 9d891461..ce5b8240 100644
--- a/libLumina/LuminaOS-Linux.cpp
+++ b/libLumina/LuminaOS-Linux.cpp
@@ -5,10 +5,14 @@
 //  See the LICENSE file for full details
 //===========================================
 #ifdef __linux__
+#include <QDebug>
 #include "LuminaOS.h"
 #include <unistd.h>
 #include <stdio.h> // Needed for BUFSIZ
 
+//can't read xbrightness settings - assume invalid until set
+static int screenbrightness = -1;
+
 // ==== ExternalDevicePaths() ====
 QStringList LOS::ExternalDevicePaths(){
     //Returns: QStringList[<type>::::<filesystem>::::<path>]
@@ -20,28 +24,74 @@ QStringList LOS::ExternalDevicePaths(){
 
 //Read screen brightness information
 int LOS::ScreenBrightness(){
-  //Returns: Screen Brightness as a percentage (0-100, with -1 for errors)
-  return -1;  //not implemented yet for Linux
+   //Returns: Screen Brightness as a percentage (0-100, with -1 for errors)
+  if(screenbrightness==-1){
+    if(QFile::exists("/tmp/.lumina-currentxbrightness")){
+      int val = LUtils::readFile("/tmp/.lumina-currentxbrightness").join("").simplified().toInt();
+      screenbrightness = val;
+    }
+  }
+  return screenbrightness;
+
 }
 
 //Set screen brightness
 void LOS::setScreenBrightness(int percent){
-  //not implemented yet for Linux
+  //ensure bounds
+  if(percent<0){percent=0;}
+  else if(percent>100){ percent=100; }
+  // float pf = percent/100.0; //convert to a decimel
+  //Run the command
+  QString cmd = "xbacklight -set  %1";
+  // cmd = cmd.arg( QString::number( int(65535*pf) ) );
+  cmd = cmd.arg( QString::number( percent ) );
+  int ret = LUtils::runCmd(cmd);
+  //Save the result for later
+  if(ret!=0){ screenbrightness = -1; }
+  else{ screenbrightness = percent; }
+  LUtils::writeFile("/tmp/.lumina-currentxbrightness", QStringList() << QString::number(screenbrightness), true);
+
 }
 
 //Read the current volume
 int LOS::audioVolume(){ //Returns: audio volume as a percentage (0-100, with -1 for errors)
-  return -1; //Not implemented yet for Linux
+QString info = LUtils::getCmdOutput("amixer get Master").join("").simplified();;
+  int out = -1;
+  int start_position, end_position;
+  QString current_volume;
+  if(!info.isEmpty()){
+     start_position = info.indexOf("[");
+     end_position = info.indexOf("%");
+     current_volume = info.mid(start_position + 1, (end_position - start_position) - 1);
+     out = current_volume.toInt();
+  }
+  return out;
+
+
 }
 
 //Set the current volume
 void LOS::setAudioVolume(int percent){
-  //not implemented yet for Linux
+  if(percent<0){percent=0;}
+  else if(percent>100){percent=100;}
+  QString info = "amixer -c 0 sset Master,0 " + QString::number(percent) + "%";
+  if(!info.isEmpty()){
+    //Run Command
+    LUtils::runCmd(info);
+  }
+
 }
 
 //Change the current volume a set amount (+ or -)
 void LOS::changeAudioVolume(int percentdiff){
-  //not implemented yet for Linux	
+  int old_volume = audioVolume();
+  int new_volume = old_volume + percentdiff;
+  if (new_volume < 0)
+      new_volume = 0;
+  if (new_volume > 100)
+      new_volume = 100;
+  qDebug() << "Setting new volume to: " << new_volume;
+  setAudioVolume(new_volume);
 }
 
 //Check if a graphical audio mixer is installed
diff --git a/libLumina/libLumina.pro b/libLumina/libLumina.pro
index fcf84980..9de16637 100644
--- a/libLumina/libLumina.pro
+++ b/libLumina/libLumina.pro
@@ -20,6 +20,7 @@ SOURCES	+= LuminaXDG.cpp \
 	LuminaX11.cpp \ 
 	LuminaOS-FreeBSD.cpp \
 	LuminaOS-Linux.cpp
+#       new OS support can be added here
 
 INCLUDEPATH += /usr/local/include
 
-- 
cgit