Lots of changes: Two binaries (selection/pw auth), qmake -> cmake, gitignore, more error handling

1. We now have two binaries: One pops up when the print job comes in so you can
select the printer, duplex, copies, etc... The other one pops up when used as
a backend and handles authentication by asking for username and password (WORK
IN PROGRESS!). This is to better handle things like smb printing

2. We use cmake everywhere, and now that we want two binaries it made sense to
switch.

3. Gitignore, well, what to say

4. Show an error message when calling ghostscript for grayscale conversion failed,
insted of just doing nothing and not even closing the GUI.

5. Keep the printergui open for a few seconds after printing, but hide the
window. Later we want to check in the password gui if the printergui is
open to make sure we really should run, and maybe even exchange some information.

1 files changed, 243 insertions, 0 deletions

diff --git a/src/maingui/printergui.cpp b/src/maingui/printergui.cpp
new file mode 100644
index 0000000..3744ffc
--- /dev/null
+++ b/src/maingui/printergui.cpp
@@ -0,0 +1,243 @@
+#include "printergui.h"
+#include "ui_printergui.h"
+#include <QMessageBox>
+#include <unistd.h>
+#include <QTimer>
+
+// ____________________________________________________________________________
+PrinterGui::PrinterGui(char *argv[], QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::PrinterGui),
+    bgTimeout(-1)
+{
+  // When called it is guaranteed that argv has (at least) 3 elements
+
+  // Set username
+  char buf[200];
+  if (getlogin_r(buf, 200) == 0) {
+    // Detect real name
+    this->user = strdup(buf);
+  } else {
+    // Fallback to what command line says
+    this->user = strdup(argv[1]);
+  }
+
+  // Filename
+  this->file = new char[strlen(argv[2]) + 10]; // + 10 in case we rename (ghostscript)
+  strcpy(this->file, argv[2]);
+
+  // Initialize cups
+  num_dests = cupsGetDests(&dests);
+
+  // Initialize UI
+  initializeUI();
+
+  // Timer
+  this->bgTimer = new QTimer(this);
+  this->bgTimer->setInterval(1000);
+  connect(bgTimer, SIGNAL(timeout()), this, SLOT(on_bgTimer_timeout()));
+}
+
+// ____________________________________________________________________________
+PrinterGui::~PrinterGui()
+{
+  cupsFreeDests(num_dests, dests);
+  free(this->user);
+  delete[] this->file;
+  delete this->ui;
+}
+
+// ____________________________________________________________________________
+void PrinterGui::initializeUI()
+{
+  ui->setupUi(this);
+  ui->horizontalLayoutButtons->setAlignment(Qt::AlignRight);
+
+  /*  Initialize Treeview  */
+
+  ui->printerList->setColumnCount(3);
+  ui->printerList->setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum);
+
+  // Rename headers
+  QStringList h;
+  h.append("Drucker");
+  h.append("Information");
+  h.append("Standort");
+  ui->printerList->setHeaderLabels(h);
+
+  // Fill treewidget with data from cups dests;
+  cups_dest_t *dest = dests;
+  for (int i = num_dests; i>0; ++dest, --i )
+    if (dest->instance == NULL) {
+      QTreeWidgetItem *wi = new QTreeWidgetItem();
+      wi->setText(0, QString(dest->name));
+      wi->setText(1, QString(cupsGetOption("printer-info", dest->num_options, dest->options)));
+      wi->setText(2, QString(cupsGetOption("printer-location", dest->num_options, dest->options)));
+      ui->printerList->addTopLevelItem(wi);
+      if (dest->is_default)
+        ui->printerList->setCurrentItem(wi);
+    }
+
+  // Resize columns to contents
+  for (int i = 0; i < 3; ++i)
+    ui->printerList->resizeColumnToContents(i);
+
+  /*  Main Window properties  */
+
+  // Disable close button
+  this->setWindowFlags((this->windowFlags() & ~Qt::WindowCloseButtonHint) | Qt::WindowStaysOnTopHint);
+  // center dialog on screen center
+  QRect desktopRect = QApplication::desktop()->screenGeometry(this);
+  this->move( desktopRect.width()/2-this->width()/2,
+              desktopRect.height()/2-this->height()/2);
+}
+
+// ____________________________________________________________________________
+void PrinterGui::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
+{
+  ui->printerList->setFocus();
+
+  cups_dest_t *dest =cupsGetNamedDest(CUPS_HTTP_DEFAULT, current->text(0).toUtf8().constData(), NULL);
+
+
+  /* * Check printer properties (auth, color, duplex, copies) * */
+  // get printer capabilities
+
+
+  const char *type = cupsGetOption("printer-type", dest->num_options, dest->options);
+  int res = 0;
+  if (type != NULL) {
+    res = ::atoi(type);
+  }
+
+  // Check color capabilities
+  if (res & CUPS_PRINTER_COLOR) {
+    ui->comboBoxColor->setEnabled(true);
+    ui->comboBoxColor->setCurrentIndex(1);
+  } else {
+    ui->comboBoxColor->setEnabled(false);
+    ui->comboBoxColor->setCurrentIndex(0);
+  }
+
+  // Check duplex capabilities
+  if (res & CUPS_PRINTER_DUPLEX) {
+    ui->comboBoxSides->setEnabled(true);
+  } else {
+    ui->comboBoxSides->setEnabled(false);
+    ui->comboBoxSides->setCurrentIndex(0);
+  }
+
+  // Check copy capabilities
+  if (res & CUPS_PRINTER_COPIES) {
+    ui->lineEditCopies->setEnabled(true);
+    ui->labelCopies->setEnabled(true);
+  } else {
+    ui->lineEditCopies->setEnabled(false);
+    ui->lineEditCopies->setText("1");
+    ui->labelCopies->setEnabled(false);
+  }
+
+  // Check availability
+  if (res & CUPS_PRINTER_REJECTING) {
+    ui->buttonPrint->setEnabled(false);
+  } else {
+    ui->buttonPrint->setEnabled(true);
+  }
+}
+
+// ____________________________________________________________________________
+void PrinterGui::on_buttonCancel_clicked()
+{
+  // Quit with code 1
+  QCoreApplication::instance()->exit(1);
+}
+
+// ____________________________________________________________________________
+void PrinterGui::on_buttonPrint_clicked()
+{
+  QString cmd;
+
+  // Wenn Farbe möglich ist. Aber trotzdem Graustufen gewählt
+  // Schieb file durch ghostscript
+  if (ui->comboBoxColor->isEnabled() && ui->comboBoxColor->currentIndex() == 0) {
+    // Run ghostscript to make file grayscale
+    cmd = QString::fromUtf8("gs -sDEVICE=psgray -dNOPAUSE -dBATCH -dQUIET -dSAFER  -sOutputFile=\"%1.conv\" \"%1\"")
+        .arg(QString::fromUtf8(this->file));
+    if (system(cmd.toUtf8().constData())) {
+      QMessageBox::critical(this, "PrinterGUI", "Kann Druckauftrag nicht in Graustufen konvertieren.");
+      return;
+    } else {
+      strcat(this->file, ".conv");
+    }
+
+  }
+
+  /* * Print via cups lib * */
+
+  // Destination / Queue
+  cups_dest_t *dest = cupsGetDest(
+              ui->printerList->currentItem()->text(0).toUtf8().constData(),
+              NULL,
+              num_dests,
+              dests);
+
+  // Duplex
+  if (ui->comboBoxSides->isEnabled()) {
+    switch (ui->comboBoxSides->currentIndex()) {
+    case 0:
+      dest->num_options = cupsAddOption ("Duplex",
+                                         "None",
+                                         dest->num_options,
+                                         &(dest->options));
+      break;
+    case 1:
+      dest->num_options = cupsAddOption ("Duplex",
+                                         "DuplexNoTumble",
+                                         dest->num_options,
+                                         &(dest->options));
+      break;
+    case 2:
+      dest->num_options = cupsAddOption ("Duplex",
+                                         "DuplexTumble",
+                                         dest->num_options,
+                                         &(dest->options));
+      break;
+    }
+  }
+
+  // Kopien
+  if (ui->lineEditCopies->isEnabled()) {
+    dest->num_options = cupsAddOption ("copies",
+                                       ui->lineEditCopies->text().toUtf8().constData(),
+                                       dest->num_options,
+                                       &(dest->options));
+  }
+
+  cupsSetUser(this->user);
+
+  // Drucken
+  if( 0 == cupsPrintFile(dest->name,
+                         file,
+                         NULL,
+                         dest->num_options,
+                         dest->options)) {
+    QMessageBox::critical(this, "CUPS Fehler", cupsLastErrorString());
+  } else {
+    this->bgTimeout = 0;
+    this->hide();
+  }
+
+}
+
+void PrinterGui::on_bgTimer_timeout()
+{
+  if (this->bgTimeout == -1) {
+    // Could do something here every second....
+    return;
+  }
+  if (++this->bgTimeout > 4) {
+    // Job was sent, GUI is invisible, quit after a few seconds
+    QCoreApplication::instance()->quit();
+  }
+}
+