Update viewer

* viewer/viewer.cc,
* viewer/browser_widget.cc,
* viewer/browser_widget.hh:
Browse to the directory taken as first parameter.

* viewer/main.cc:
Add usage info.

viewer/browser_widget.cc

@@ -14,7 +14,7 @@
 
 #include "browser_widget.hh"
 
-BrowserWidget::BrowserWidget(QDirModel* files)
+BrowserWidget::BrowserWidget(QDirModel* files, QString dir)
   : files_(files),
     view_(new QListView()),
     path_(new QLabel(""))
@@ -34,6 +34,9 @@ BrowserWidget::BrowserWidget(QDirModel* files)
 		   | QDir::Readable | QDir::Drives);
 
   view_->setRootIndex(files->index(QDir::currentPath()));
+  QDir d(dir);
+  if (d.isReadable())
+    view_->setRootIndex(files->index(d.absolutePath()));
   view_->setRowHidden(0, true);
   path_->setText(files->filePath(view_->rootIndex()));
   connect(view_, SIGNAL(activated(const QModelIndex&)),

viewer/browser_widget.hh

@@ -23,7 +23,7 @@ class BrowserWidget
   Q_OBJECT
 
 public:
-  BrowserWidget(QDirModel* files);
+  BrowserWidget(QDirModel* files, QString dir = QString());
   ~BrowserWidget();
 
 public slots:

viewer/main.cc

@@ -13,14 +13,25 @@
 //
 
 #include <QtGui>
+#include <iostream>
+
 #include "viewer.hh"
 
 int main(int argc, char** argv)
 {
+  if (argc > 2 ||
+      (argc == 2 &&
+       (QString(argv[1]) == "--help" || QString(argv[1]) == "-h")))
+  {
+    std::cout << "Usage:" << std::endl
+	      << argv[0] << " <image dir>" << std::endl;
+    return 0;
+  }
+
   Viewer* viewer = Viewer::Instance(argc, argv);
 
   if (!viewer)
-    return 0;
+    return -1;
 
   return viewer->exec();
 }

viewer/viewer.cc

@@ -119,7 +119,8 @@ Viewer::Viewer(int &argc, char** argv)
 
   PropertyWidget* property_wgt = new PropertyWidget();
   XmlWidget* xml_wgt = new XmlWidget();
-  BrowserWidget* browser_wgt = new BrowserWidget(files_);
+  BrowserWidget* browser_wgt =
+    new BrowserWidget(files_, argc != 2 ? QString() : argv[1]);
   ImageWidget* image_wgt = new ImageWidget(scene_);
   key_wgt_ = new KeyWidget(key_map_);