Implement command line options

Currently supported options are:
	- page NUM
	- fullscreen
	- help

canvas.cpp

@@ -13,7 +13,7 @@ using namespace std;
 #define SMOOTH_SCROLL_DELTA 30 // pixel scroll offset
 
 
-Canvas::Canvas(Viewer *v, QWidget *parent) :
+Canvas::Canvas(Viewer *v, int start_page, QWidget *parent) :
 		QWidget(parent),
 		viewer(v),
 		draw_overlay(true),
@@ -21,6 +21,7 @@ Canvas::Canvas(Viewer *v, QWidget *parent) :
 	setFocusPolicy(Qt::StrongFocus);
 
 	layout = new PresentationLayout(viewer->get_res());
+	layout->scroll_page(start_page, false); // apply start option
 
 	// prints the string representation of a key
 //	cerr << QKeySequence(Qt::Key_Equal).toString().toUtf8().constData() << endl;

canvas.h

@@ -30,7 +30,7 @@ class Canvas : public QWidget {
 	typedef void (Canvas::*func_t)();
 
 public:
-	Canvas(Viewer *v, QWidget *parent = 0);
+	Canvas(Viewer *v, int start_page = 0, QWidget *parent = 0);
 	~Canvas();
 
 	bool is_valid() const;

doc/katarakt.txt

@@ -10,7 +10,7 @@ katarakt - a simple PDF viewer with two layouts
 
 SYNOPSIS
 --------
-*katarakt* 'FILE'
+*katarakt* ['OPTIONS'] 'FILE'
 
 DESCRIPTION
 -----------
@@ -25,6 +25,15 @@ The 'grid layout' is much more advanced and offers continuous (smooth, per
 pixel) scrolling, zooming and adjusting the column count. Pages keep their
 correct relative size and are shown in a grid.
 
+OPTIONS
+-------
+*-p*, *--page* 'NUM'::
+	Start showing page 'NUM'.
+*-f*, *--fullscreen*::
+	Start in fullscreen mode.
+*-h*, *--help*::
+	Print help and exit.
+
 KEY BINDINGS
 ------------
 *q* ::

main.cpp

 #include <QApplication>
 #include <QString>
 #include <iostream>
+#include <getopt.h>
 #include "resourcemanager.h"
 #include "viewer.h"
 
+using namespace std;
+
+
+static void print_help(char *name) {
+	cout << "Usage:" << endl;
+	cout << "  " << name << " [OPTIONS] FILE" << endl;
+	cout << endl;
+	cout << "Options:" << endl;
+	cout << "  -p, --page NUM      Start showing page NUM" << endl;
+	cout << "  -f, --fullscreen    Start in fullscreen mode" << endl;
+	cout << "  -h, --help          Print this help and exit" << endl;
+}
 
 int main(int argc, char *argv[]) {
-	using namespace std;
 	QApplication app(argc, argv);
 
-	if (argc != 2) {
-		cerr << "usage: " << argv[0] << " <path>" << endl;
+	// parse command line options
+	int start_page = 0;
+	bool fullscreen = false;
+
+	struct option long_options[] = {
+		{"page",		required_argument,	NULL,	'p'},
+		{"fullscreen",	no_argument,		NULL,	'f'},
+		{"help",		no_argument,		NULL,	'h'},
+		{NULL, 0, NULL, 0}
+	};
+	int c;
+	int option_index = 0;
+	while (1) {
+		c = getopt_long(argc, argv, "+p:fh", long_options, &option_index);
+		if (c == -1) {
+			break;
+		}
+		switch (c) {
+			case 'p':
+				// currently no warning message on wrong input
+				start_page = atoi(optarg) - 1;
+				break;
+			case 'f':
+				fullscreen = true;
+				break;
+			case 'h':
+				print_help(argv[0]);
+				return 0;
+			default:
+				// getopt prints an error message
+				return 1;
+		}
+	}
+
+	if (argv[optind] == NULL) {
+		cerr << "Not enough arguments" << endl;
 		return 1;
 	}
 
-	Viewer katarakt(QString::fromUtf8(argv[1]));
+	Viewer katarakt(QString::fromUtf8(argv[optind]), start_page, fullscreen);
 	if (!katarakt.is_valid()) {
 		return 1;
 	}

viewer.cpp

@@ -13,8 +13,7 @@ using namespace std;
 
 int Viewer::sig_fd[2];
 
-//Viewer::Viewer(ResourceManager *res, QWidget *parent) :
-Viewer::Viewer(QString _file, QWidget *parent) :
+Viewer::Viewer(QString _file, int start_page, bool fullscreen, QWidget *parent) :
 		QWidget(parent),
 		file(_file),
 		res(NULL),
@@ -29,7 +28,7 @@ Viewer::Viewer(QString _file, QWidget *parent) :
 		return;
 	}
 
-	canvas = new Canvas(this, this);
+	canvas = new Canvas(this, start_page, this);
 	if (!canvas->is_valid()) {
 		valid = false;
 		return;
@@ -82,6 +81,11 @@ Viewer::Viewer(QString _file, QWidget *parent) :
 	resize(500, 500);
 	show();
 	search_bar->hide();
+
+	// apply start options
+	if (fullscreen) {
+		toggle_fullscreen();
+	}
 }
 
 Viewer::~Viewer() {

viewer.h

@@ -3,7 +3,6 @@
 
 #include <QWidget>
 #include <QVBoxLayout>
-//#include <QLineEdit>
 #include <QKeySequence>
 #include <QSocketNotifier>
 #include <map>
@@ -20,8 +19,7 @@ class Viewer : public QWidget {
 	typedef void (Viewer::*func_t)();
 
 public:
-//	Viewer(ResourceManager *res, QWidget *parent = 0);
-	Viewer(QString _file, QWidget *parent = 0);
+	Viewer(QString _file, int start_page, bool fullscreen, QWidget *parent = 0);
 	~Viewer();
 
 	bool is_valid() const;
@@ -47,7 +45,6 @@ private:
 	ResourceManager *res;
 	Canvas *canvas;
 	SearchBar *search_bar;
-//	QLineEdit *search_bar;
 	QVBoxLayout *layout;
 
 	// signal handling