[ViewVC] Annotation of: cvs/CV/bin/cv

#!/opt/bin/perl

use Cwd ();
use Encode ();

use Gtk2 -init;
use Gtk2::Gdk::Keysyms;

use Gtk2::CV;

use Gtk2::CV::ImageWindow;
use Gtk2::CV::Schnauzer;

BEGIN {
   require Gtk2::CV::Plugin;
   require "$ENV{HOME}/.cvrc" if -r "$ENV{HOME}/.cvrc";
}

use Gtk2::CV::Plugin::NameCluster;
use Gtk2::CV::Plugin::RCluster;

Gtk2::Rc->parse (Gtk2::CV::find_rcfile "gtkrc");

use File::Spec;

my $mainwin;
my $viewer;
my $schnauzer;
my $info;
my $help;

my $schnauzer_idx = 0;

sub new_schnauzer {
   my $s = new Gtk2::CV::Schnauzer;

   $s->signal_connect_after (key_press_event => \&std_keys);
   $s->signal_connect (activate => sub {
      my $label = sprintf "%s (%d)",
                  (File::Spec->splitpath ($_[1]))[2],
                  -s $_[1];
      $info->set_label ($label);
      $viewer->load_image ($_[1]);
   });

   Gtk2::CV::Plugin->call (new_schnauzer => $s);

   $s
}

sub std_keys {
   my $key = $_[1]->keyval;
   my $state = $_[1]->state;

   my $ctrl = $state * "control-mask";

   if ($key == $Gtk2::Gdk::Keysyms{q}) {
      main_quit Gtk2;
   } elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
      my $w = new Gtk2::Window;

      $w->set_title ("CV: Schnauzer");
      $w->add (my $s = new_schnauzer);
      $s->set_dir (File::Spec->curdir);
      $s->set_geometry_hints;
      $w->show_all;

   } elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
      unless ($help) {
         require Gtk2::PodViewer;

         $help = new Gtk2::Window;
         $help->set_title ("CV: Help");
         $help->set_default_size (500, 300);
         $help->signal_connect (delete_event => sub { $help->hide; 1 });

         $help->add (my $sw = new Gtk2::ScrolledWindow);
         $sw->add (my $h = new Gtk2::PodViewer);

         #binmode DATA, ":utf8";
         $h->load_string (do { local $/; <DATA> });
      }

      $help->show_all;
   } else {
      return 0;
   }

   1
}

{
   $viewer = new Gtk2::CV::ImageWindow;

   $viewer->set_title ("CV: Image");

   $viewer->signal_connect (key_press_event => sub {
      &std_keys
         or $schnauzer->signal_emit (key_press_event => $_[1])
   });
   $viewer->signal_connect (delete_event => sub { main_quit Gtk2 });

   $viewer->signal_connect (button3_press_event => sub {
      $mainwin->visible
         ? $mainwin->hide
         : $mainwin->show_all;
      1
   });

   Gtk2::CV::Plugin->call (new_imagewindow => $viewer);

   $schnauzer = new_schnauzer;

   $mainwin = new Gtk2::Window;
   $mainwin->set_title ("CV");
   $mainwin->add (my $vbox = new Gtk2::VBox);
   $mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });

   $vbox->add ($schnauzer);
   $vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
   $frame->add (my $hbox = new Gtk2::HBox 0, 0);
   $hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
   $hbox->pack_end   (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
   $labelwindow->add ($info = new Gtk2::Label);
   $labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
   $info->set (selectable => 1, xalign => 0, justify => "left");

   $schnauzer->set_geometry_hints;
}

if (@ARGV) {
   @ARGV == 1 && -d $ARGV[0]
      ? $schnauzer->set_dir (Glib::filename_to_unicode shift)
      : $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV]);
   $schnauzer->show_all;
   $schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
} else {
   $schnauzer->set_dir (File::Spec->curdir);
   $mainwin->show_all;
}

$viewer->show_all;

main Gtk2;

__DATA__

=encoding utf-8

=head1 NAME

cv - a fast gtk+ image viewer loosely modeled after XV

=head1 SYNOPSIS

   cv [file...]

=head1 FEATURES

CV is supposed to work similar to the venerable XV image viewer, just
faster. Why faster?

=over 4

=item * optimized directory scanning algorithm

The directory scanning in CV uses some tricks that - on most modern
filesystems - makes it possible to detect filetypes faster than stat()'ing
every file. This makes CV suitable for directories with lots of files
(10000+).

This algorithm is quite unprecise - it doesn't make a difference between
files, device nodes, symlinks and the like, and filetype detection is done
using the file extension only.

On the positive side, it is usually many orders of magnitude faster than
traditional scanning techniques (good for directories with 10000 or
100000+ files).

=item * queuing for all time-consuming background tasks

All tasks, such as unlinking files or generating thumbnails, that can be
done in the background will be done so - no waiting required, even when
changing directories.

=item * use of asynchronous I/O

CV tries to use asynchronous I/O whereever it makes sense, for example
while scanning directories, waiting for stat data, unlinking files or
generating thumbnails. This usually decreases scanning times for large
directories a bit (especially on RAID devices and over NFS) and makes CV
much more interactive.

=item * fast image loading

The time span between the user issuing a command and displaying the new
image should be as small as possible. CV uses optimized (especially
for JPEG) loading functions and sacrifices some quality (e.g no gamma
correction, although this might change) to achieve this speed.

=item * fast thumbnail creation

Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
creation for JPEGs has been specially optimized and can even take
advantage of multiple CPUs.

=item * minimum optical clutter

CV has no menus or other user interface elements that take up a lot of
screen space (or are useful for beginning users). The schnauzer windows
can also be somewhat crowded.

The point of an image viewer is viewing images, not a nice GUI. This is
similar to XV's behaviour.

=item * efficient (and hard to learn) user interface

CV uses key combinations. A lot. If you are an experienced XV user, you
will find most of these keys familiar. If not, CV might be hard to use at
first, but will be an efficient tool later.

=item * multi-window GUI

CV doesn't force you to use a specific layout, instead it relies on your
window manager, thus enabling you to chose whatever layout that suits you
most.

=item * i18n'ed filename handling throughout

As long as glib can recognize your filename encoding (either UTF-8 or
locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
have the relevant fonts, CV will display your filenames correctly.

=item * extensible through plug-ins

I have weird plug-ins that access remote databases to find a
directory. This is not likely to be of any use to other people. Likewise,
others might have weird requirements I cannot dream of.

=item * filename clustering

Among the standard plug-ins is a filename clustering plug-in, that (in
case of tens of thousands images in one directory) might be able to
cluster similar names together.

=back

=head1 DESCRIPTION

=head2 THE IMAGE WINDOW

You can use the following keys in the image window:

 q            quit the program
 <            half the image size
 >            double the image size
 ,            shrink the image by 10%
 .            enlarge the image by 10%
 n            reset to normal size
 m            maximize to screensize
 M            maximize to screensize, respecting image aspect
 ctrl-m       toggle maxpect-always mode
 ctrl-sift-m  toggle using current image size as max image size
 u            uncrop
 r            set scaling mode to 'nearest' (fastest)
 s            set scaling mode to 'bilinear' (default)
 shift-s      set scaling mode to 'hyper' (slowest)
 t            rotate clockwise 90°
 T            rotate counterclockwise°
 ctrl-v       open a new visual schnauzer window for the current dir
 ctrl-e       run an editor ($CV_EDITOR or "gimp") on the current image
 ctrl-p       fire up the print dialog
 escape       cancel a crop action

And when playing movies, these additional keys are active:

 left         rewind by 10 seconds
 right        forward by 10 seconds
 down         rewind by 60 seconds
 up           forward by 60 seconds
 pg_up        rewind by 600 seconds
 pg_down      forward by 600 seconds
 o            toggle on-screen display
 p            pause/unpause
 escape       stop playing
 9            turn volume down
 0            turn volume up

Any other keys will be sent to the default schnauzer window, which can be
toggled on and off by right-clicking into the image window.

Left-clicking into the image window will let you crop the image (usually
to zoom into large images that CV scales down).

=head2 THE VISUAL SCHNAUZER

You can use the following keys in the schnauzer window:

 ctrl-space,
 space        move to and display next image
 ctrl-backspace,
 backspace    move to and display previous image
 ctrl-return,
 return       display selected picture, or enter directory

 cursor keys  move selection
 page-up      move one page up
 page-down    move one page down
 home         move to first file
 end          move to last file

 ctrl-a       select all files
 ctrl-shift-a select all files currently displayed in the schnauzer window
 ctrl-d       delete selected files WITHOUT ASKING AGAIN
 ctrl-g       force generation of thumbnais for the selected files
 ctrl-s       rescan current direcory or files updates/deletes etc.
 ctrl-u       update selected (or all) icons if neccessary
 ctrl-l       don't use, will become a plug-in eventually

 ^            go to parent directory (caret).

 0-9,
 a-z          find the first filename beginning with this letter

Right-clicking into the schnauzer window displays a pop-up menu with
additional actions.

=head3 SELECTION

You can select entries in the Schnauzer in a variety of ways:

=over 4

=item Keyboard

Moving the cursor with the keyboard will first deselect all files and then
select the file you moved to.

=item Clicking

Clicking on an entry will select the one you clicked and deselect all
others.

=item Shift-Clicking

Shift-clicking will toggle the selection on the entry under the mouse.

=item Dragging

Dragging will select all entries between the one selected when pushing the
button and the one selected when releasing the button. If you move above
or below the schnauzer area while drag-selecting, the schnauzer will move
up/down one row twice per second. In addition, horizontal mouse movement
acts as a kind of invisible horizontal scrollbar.

=item Hint: double-click works while click-selecting

You can double-click any image while click-selecting to display it
without stopping the selection process. This will act as if you normally
double-clicked the image to display it, and will toggle the selection
twice, resulting in no change.

=back

=head1 FILES

When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
it were a perl script. in that, you will mostly load plug-ins.

Example:

   system "fping -q -t 10 ether"
     or require "/fs/cv/cvplugin.pl";

This will load a plug-in, but only if the machine I<ether> is reachable
(supposedly the plug-in is networked in some way :).

=head1 ENVIRONMENT

=over 4

=item CV_EDITOR

The program that gets executed when the user presses C<CTRL-e> in the
Schnauzer or image window. The default is C<gimp>.

=item CV_PRINT_DESTINATION

The default (perl-style) destination to use in the print dialog.

=item CV_TRASHCAN

When set, must point to a directory where all files that are deleted are
moved to. If unset, files that are deleted are really being deleted.

=back

=head1 SECURITY CONSIDERATIONS

CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
this purpose, though (from the gtk-2.2 release notes):

"While efforts have been made to make gdk-pixbuf robust against invalid
images, using gdk-pixbuf to load untrusted data is not recommended, due to
the likelyhood that there are additional problems where an invalid image
could cause gdk-pixbuf to crash or worse."

=head1 BUGS/TODO

 Lots of functionality is missing.

 Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
 names incompatible with utf-8 might fail.

 rotate on disk
 lots of ui issues
 save(?)
 preferences

=head1 AUTHOR

Marc Lehmann <cv@plan9.de>.

=cut

Revision:	1.61
Committed:	Sat Sep 24 00:51:28 2005 UTC (18 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.60:	+8 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#!/opt/bin/perl
2
3	root	1.37	use Cwd ();
4			use Encode ();
5
6	root	1.12	use Gtk2 -init;
7			use Gtk2::Gdk::Keysyms;
8
9	root	1.48	use Gtk2::CV;
10
11	root	1.12	use Gtk2::CV::ImageWindow;
12			use Gtk2::CV::Schnauzer;
13
14	root	1.48	BEGIN {
15			require Gtk2::CV::Plugin;
16			require "$ENV{HOME}/.cvrc" if -r "$ENV{HOME}/.cvrc";
17			}
18
19			use Gtk2::CV::Plugin::NameCluster;
20			use Gtk2::CV::Plugin::RCluster;
21	root	1.16
22			Gtk2::Rc->parse (Gtk2::CV::find_rcfile "gtkrc");
23
24	root	1.20	use File::Spec;
25
26			my $mainwin;
27	root	1.12	my $viewer;
28			my $schnauzer;
29	root	1.20	my $info;
30	root	1.21	my $help;
31	root	1.12
32	root	1.25	my $schnauzer_idx = 0;
33
34	root	1.12	sub new_schnauzer {
35	root	1.20	my $s = new Gtk2::CV::Schnauzer;
36	root	1.12
37			$s->signal_connect_after (key_press_event => \&std_keys);
38	root	1.20	$s->signal_connect (activate => sub {
39			my $label = sprintf "%s (%d)",
40			(File::Spec->splitpath ($_[1]))[2],
41			-s $_[1];
42			$info->set_label ($label);
43			$viewer->load_image ($_[1]);
44			});
45	root	1.12
46	root	1.40	Gtk2::CV::Plugin->call (new_schnauzer => $s);
47
48	root	1.53	$s
49	root	1.12	}
50
51			sub std_keys {
52			my $key = $_[1]->keyval;
53			my $state = $_[1]->state;
54
55	root	1.21	my $ctrl = $state * "control-mask";
56	root	1.12
57			if ($key == $Gtk2::Gdk::Keysyms{q}) {
58			main_quit Gtk2;
59			} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
60	root	1.20	my $w = new Gtk2::Window;
61	root	1.26
62			$w->set_title ("CV: Schnauzer");
63	root	1.20	$w->add (my $s = new_schnauzer);
64			$s->set_dir (File::Spec->curdir);
65	root	1.25	$s->set_geometry_hints;
66	root	1.21	$w->show_all;
67	root	1.25
68	root	1.21	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
69			unless ($help) {
70			require Gtk2::PodViewer;
71
72			$help = new Gtk2::Window;
73	root	1.26	$help->set_title ("CV: Help");
74	root	1.21	$help->set_default_size (500, 300);
75			$help->signal_connect (delete_event => sub { $help->hide; 1 });
76
77			$help->add (my $sw = new Gtk2::ScrolledWindow);
78			$sw->add (my $h = new Gtk2::PodViewer);
79
80			#binmode DATA, ":utf8";
81			$h->load_string (do { local $/; <DATA> });
82			}
83
84			$help->show_all;
85	root	1.12	} else {
86	root	1.43	return 0;
87	root	1.12	}
88
89	root	1.43	1
90	root	1.12	}
91
92	root	1.20	{
93			$viewer = new Gtk2::CV::ImageWindow;
94	root	1.15
95	root	1.20	$viewer->set_title ("CV: Image");
96	root	1.15
97	root	1.43	$viewer->signal_connect (key_press_event => sub {
98			&std_keys
99			or $schnauzer->signal_emit (key_press_event => $_[1])
100			});
101	root	1.20	$viewer->signal_connect (delete_event => sub { main_quit Gtk2 });
102	root	1.13
103	root	1.20	$viewer->signal_connect (button3_press_event => sub {
104			$mainwin->visible
105			? $mainwin->hide
106			: $mainwin->show_all;
107	root	1.53	1
108	root	1.20	});
109
110	root	1.40	Gtk2::CV::Plugin->call (new_imagewindow => $viewer);
111
112	root	1.20	$schnauzer = new_schnauzer;
113
114			$mainwin = new Gtk2::Window;
115			$mainwin->set_title ("CV");
116			$mainwin->add (my $vbox = new Gtk2::VBox);
117	root	1.53	$mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });
118	root	1.20
119			$vbox->add ($schnauzer);
120	root	1.22	$vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
121	root	1.20	$frame->add (my $hbox = new Gtk2::HBox 0, 0);
122	root	1.45	$hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
123			$hbox->pack_end (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
124			$labelwindow->add ($info = new Gtk2::Label);
125			$labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
126			$info->set (selectable => 1, xalign => 0, justify => "left");
127	root	1.25
128			$schnauzer->set_geometry_hints;
129	root	1.20	}
130	root	1.12
131			if (@ARGV) {
132	root	1.52	@ARGV == 1 && -d $ARGV[0]
133			? $schnauzer->set_dir (Glib::filename_to_unicode shift)
134			: $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV]);
135	root	1.31	$schnauzer->show_all;
136	root	1.18	$schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
137	root	1.17	} else {
138	root	1.20	$schnauzer->set_dir (File::Spec->curdir);
139	root	1.19	$mainwin->show_all;
140	root	1.12	}
141
142	root	1.35	$viewer->show_all;
143
144	root	1.12	main Gtk2;
145	root	1.21
146			__DATA__
147	root	1.12
148	root	1.58	=encoding utf-8
149
150	root	1.11	=head1 NAME
151
152	root	1.47	cv - a fast gtk+ image viewer loosely modeled after XV
153	root	1.11
154			=head1 SYNOPSIS
155
156			cv [file...]
157
158	root	1.47	=head1 FEATURES
159
160			CV is supposed to work similar to the venerable XV image viewer, just
161			faster. Why faster?
162
163			=over 4
164
165			=item * optimized directory scanning algorithm
166
167	root	1.55	The directory scanning in CV uses some tricks that - on most modern
168	root	1.47	filesystems - makes it possible to detect filetypes faster than stat()'ing
169			every file. This makes CV suitable for directories with lots of files
170			(10000+).
171
172			This algorithm is quite unprecise - it doesn't make a difference between
173			files, device nodes, symlinks and the like, and filetype detection is done
174			using the file extension only.
175
176	root	1.55	On the positive side, it is usually many orders of magnitude faster than
177			traditional scanning techniques (good for directories with 10000 or
178			100000+ files).
179
180	root	1.53	=item * queuing for all time-consuming background tasks
181
182			All tasks, such as unlinking files or generating thumbnails, that can be
183			done in the background will be done so - no waiting required, even when
184			changing directories.
185
186	root	1.47	=item * use of asynchronous I/O
187
188			CV tries to use asynchronous I/O whereever it makes sense, for example
189	root	1.53	while scanning directories, waiting for stat data, unlinking files or
190			generating thumbnails. This usually decreases scanning times for large
191			directories a bit (especially on RAID devices and over NFS) and makes CV
192			much more interactive.
193	root	1.47
194			=item * fast image loading
195
196			The time span between the user issuing a command and displaying the new
197			image should be as small as possible. CV uses optimized (especially
198			for JPEG) loading functions and sacrifices some quality (e.g no gamma
199	root	1.55	correction, although this might change) to achieve this speed.
200	root	1.47
201			=item * fast thumbnail creation
202
203	root	1.55	Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
204			on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
205			creation for JPEGs has been specially optimized and can even take
206			advantage of multiple CPUs.
207	root	1.47
208			=item * minimum optical clutter
209
210			CV has no menus or other user interface elements that take up a lot of
211	root	1.55	screen space (or are useful for beginning users). The schnauzer windows
212			can also be somewhat crowded.
213	root	1.47
214			The point of an image viewer is viewing images, not a nice GUI. This is
215			similar to XV's behaviour.
216
217			=item * efficient (and hard to learn) user interface
218
219			CV uses key combinations. A lot. If you are an experienced XV user, you
220			will find most of these keys familiar. If not, CV might be hard to use at
221			first, but will be an efficient tool later.
222
223	root	1.55	=item * multi-window GUI
224
225			CV doesn't force you to use a specific layout, instead it relies on your
226			window manager, thus enabling you to chose whatever layout that suits you
227			most.
228
229	root	1.47	=item * i18n'ed filename handling throughout
230
231			As long as glib can recognize your filename encoding (either UTF-8 or
232	root	1.55	locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
233			have the relevant fonts, CV will display your filenames correctly.
234	root	1.47
235			=item * extensible through plug-ins
236
237			I have weird plug-ins that access remote databases to find a
238			directory. This is not likely to be of any use to other people. Likewise,
239			others might have weird requirements I cannot dream of.
240
241			=item * filename clustering
242
243			Among the standard plug-ins is a filename clustering plug-in, that (in
244			case of tens of thousands images in one directory) might be able to
245			cluster similar names together.
246
247			=back
248
249	root	1.11	=head1 DESCRIPTION
250
251			=head2 THE IMAGE WINDOW
252
253			You can use the following keys in the image window:
254
255	root	1.50	q quit the program
256			< half the image size
257			> double the image size
258			, shrink the image by 10%
259			. enlarge the image by 10%
260			n reset to normal size
261			m maximize to screensize
262			M maximize to screensize, respecting image aspect
263			ctrl-m toggle maxpect-always mode
264	root	1.59	ctrl-sift-m toggle using current image size as max image size
265	root	1.50	u uncrop
266			r set scaling mode to 'nearest' (fastest)
267			s set scaling mode to 'bilinear' (default)
268			shift-s set scaling mode to 'hyper' (slowest)
269			t rotate clockwise 90°
270			T rotate counterclockwise°
271			ctrl-v open a new visual schnauzer window for the current dir
272			ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image
273	root	1.57	ctrl-p fire up the print dialog
274	root	1.50	escape cancel a crop action
275	root	1.11
276	root	1.33	And when playing movies, these additional keys are active:
277
278	root	1.50	left rewind by 10 seconds
279			right forward by 10 seconds
280			down rewind by 60 seconds
281			up forward by 60 seconds
282			pg_up rewind by 600 seconds
283			pg_down forward by 600 seconds
284			o toggle on-screen display
285			p pause/unpause
286			escape stop playing
287			9 turn volume down
288			0 turn volume up
289	root	1.33
290	root	1.47	Any other keys will be sent to the default schnauzer window, which can be
291			toggled on and off by right-clicking into the image window.
292	root	1.11
293	root	1.47	Left-clicking into the image window will let you crop the image (usually
294			to zoom into large images that CV scales down).
295	root	1.11
296			=head2 THE VISUAL SCHNAUZER
297
298			You can use the following keys in the schnauzer window:
299
300	root	1.47	ctrl-space,
301	root	1.50	space move to and display next image
302	root	1.47	ctrl-backspace,
303	root	1.50	backspace move to and display previous image
304	root	1.47	ctrl-return,
305	root	1.50	return display selected picture, or enter directory
306	root	1.11
307	root	1.50	cursor keys move selection
308			page-up move one page up
309			page-down move one page down
310			home move to first file
311			end move to last file
312
313			ctrl-a select all files
314			ctrl-shift-a select all files currently displayed in the schnauzer window
315			ctrl-d delete selected files WITHOUT ASKING AGAIN
316			ctrl-g force generation of thumbnais for the selected files
317			ctrl-s rescan current direcory or files updates/deletes etc.
318			ctrl-u update selected (or all) icons if neccessary
319			ctrl-l don't use, will become a plug-in eventually
320	root	1.47
321	root	1.56	^ go to parent directory (caret).
322
323	root	1.47	0-9,
324	root	1.50	a-z find the first filename beginning with this letter
325	root	1.47
326			Right-clicking into the schnauzer window displays a pop-up menu with
327			additional actions.
328
329	root	1.60	=head3 SELECTION
330
331			You can select entries in the Schnauzer in a variety of ways:
332
333			=over 4
334
335			=item Keyboard
336
337			Moving the cursor with the keyboard will first deselect all files and then
338			select the file you moved to.
339
340	root	1.61	=item Clicking
341	root	1.60
342	root	1.61	Clicking on an entry will select the one you clicked and deselect all
343			others.
344	root	1.60
345	root	1.61	=item Shift-Clicking
346
347			Shift-clicking will toggle the selection on the entry under the mouse.
348
349			=item Dragging
350	root	1.60
351			Dragging will select all entries between the one selected when pushing the
352			button and the one selected when releasing the button. If you move above
353			or below the schnauzer area while drag-selecting, the schnauzer will move
354			up/down one row twice per second. In addition, horizontal mouse movement
355			acts as a kind of invisible horizontal scrollbar.
356
357			=item Hint: double-click works while click-selecting
358
359			You can double-click any image while click-selecting to display it
360			without stopping the selection process. This will act as if you normally
361			double-clicked the image to display it, and will toggle the selection
362			twice, resulting in no change.
363
364			=back
365
366	root	1.47	=head1 FILES
367
368			When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
369			it were a perl script. in that, you will mostly load plug-ins.
370
371			Example:
372
373			system "fping -q -t 10 ether"
374			or require "/fs/cv/cvplugin.pl";
375
376			This will load a plug-in, but only if the machine I<ether> is reachable
377			(supposedly the plug-in is networked in some way :).
378	root	1.11
379	root	1.27	=head1 ENVIRONMENT
380
381			=over 4
382
383	root	1.38	=item CV_EDITOR
384
385			The program that gets executed when the user presses C<CTRL-e> in the
386			Schnauzer or image window. The default is C<gimp>.
387
388	root	1.27	=item CV_PRINT_DESTINATION
389
390			The default (perl-style) destination to use in the print dialog.
391
392	root	1.38	=item CV_TRASHCAN
393
394			When set, must point to a directory where all files that are deleted are
395			moved to. If unset, files that are deleted are really being deleted.
396
397	root	1.27	=back
398
399	root	1.23	=head1 SECURITY CONSIDERATIONS
400
401	root	1.54	CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
402			this purpose, though (from the gtk-2.2 release notes):
403	root	1.23
404			"While efforts have been made to make gdk-pixbuf robust against invalid
405			images, using gdk-pixbuf to load untrusted data is not recommended, due to
406			the likelyhood that there are additional problems where an invalid image
407			could cause gdk-pixbuf to crash or worse."
408
409	root	1.11	=head1 BUGS/TODO
410	root	1.23
411	root	1.47	Lots of functionality is missing.
412
413			Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
414	root	1.54	names incompatible with utf-8 might fail.
415	root	1.11
416			rotate on disk
417			lots of ui issues
418			save(?)
419			preferences
420
421			=head1 AUTHOR
422
423			Marc Lehmann <cv@plan9.de>.
424
425			=cut
426	root	1.1