[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 $viewer_count;
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]) if $viewer; # TODO: error, or chose ANY viewer
   });

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

   $s
}

sub new_viewer {
   my $self = new Gtk2::CV::ImageWindow;

   $viewer_count++;

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

   $self->signal_connect (key_press_event => sub {
      $viewer = $_[0];

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

      if ($state * "control-mask" && $key == $Gtk2::Gdk::Keysyms{c}) {
         my $viewer = new_viewer ();
         $viewer->set_image ($_[0]->{image});
         $viewer->show_all;
         1
      } else {
         &std_keys
            or $schnauzer->signal_emit (key_press_event => $_[1])
      }
   });
   $self->signal_connect (destroy => sub {
      $viewer = undef if $viewer == $_[0];

      main_quit Gtk2 unless --$viewer_count;
   });

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

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

   $self
}

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

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

   if ($key == $Gtk2::Gdk::Keysyms{q}) {
      $viewer->destroy;
   } elsif ($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_viewer;
   $::cur_viewer = $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:	1.62
Committed:	Tue Oct 4 04:55:47 2005 UTC (18 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.61:	+46 -20 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	root	1.62	my $viewer_count;
29	root	1.12	my $schnauzer;
30	root	1.20	my $info;
31	root	1.21	my $help;
32	root	1.12
33	root	1.25	my $schnauzer_idx = 0;
34
35	root	1.12	sub new_schnauzer {
36	root	1.20	my $s = new Gtk2::CV::Schnauzer;
37	root	1.12
38			$s->signal_connect_after (key_press_event => \&std_keys);
39	root	1.20	$s->signal_connect (activate => sub {
40			my $label = sprintf "%s (%d)",
41			(File::Spec->splitpath ($_[1]))[2],
42			-s $_[1];
43			$info->set_label ($label);
44	root	1.62	$viewer->load_image ($_[1]) if $viewer; # TODO: error, or chose ANY viewer
45	root	1.20	});
46	root	1.12
47	root	1.40	Gtk2::CV::Plugin->call (new_schnauzer => $s);
48
49	root	1.53	$s
50	root	1.12	}
51
52	root	1.62	sub new_viewer {
53			my $self = new Gtk2::CV::ImageWindow;
54
55			$viewer_count++;
56
57			$self->set_title ("CV: Image");
58
59			$self->signal_connect (key_press_event => sub {
60			$viewer = $_[0];
61
62			my $key = $_[1]->keyval;
63			my $state = $_[1]->state;
64
65			if ($state * "control-mask" && $key == $Gtk2::Gdk::Keysyms{c}) {
66			my $viewer = new_viewer ();
67			$viewer->set_image ($_[0]->{image});
68			$viewer->show_all;
69			1
70			} else {
71			&std_keys
72			or $schnauzer->signal_emit (key_press_event => $_[1])
73			}
74			});
75			$self->signal_connect (destroy => sub {
76			$viewer = undef if $viewer == $_[0];
77
78			main_quit Gtk2 unless --$viewer_count;
79			});
80
81			$self->signal_connect (button3_press_event => sub {
82			$mainwin->visible
83			? $mainwin->hide
84			: $mainwin->show_all;
85			1
86			});
87
88			Gtk2::CV::Plugin->call (new_imagewindow => $self);
89
90			$self
91			}
92
93	root	1.12	sub std_keys {
94			my $key = $_[1]->keyval;
95			my $state = $_[1]->state;
96
97	root	1.21	my $ctrl = $state * "control-mask";
98	root	1.12
99			if ($key == $Gtk2::Gdk::Keysyms{q}) {
100	root	1.62	$viewer->destroy;
101	root	1.12	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
102	root	1.20	my $w = new Gtk2::Window;
103	root	1.26
104			$w->set_title ("CV: Schnauzer");
105	root	1.20	$w->add (my $s = new_schnauzer);
106			$s->set_dir (File::Spec->curdir);
107	root	1.25	$s->set_geometry_hints;
108	root	1.21	$w->show_all;
109	root	1.25
110	root	1.21	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
111			unless ($help) {
112			require Gtk2::PodViewer;
113
114			$help = new Gtk2::Window;
115	root	1.26	$help->set_title ("CV: Help");
116	root	1.21	$help->set_default_size (500, 300);
117			$help->signal_connect (delete_event => sub { $help->hide; 1 });
118
119			$help->add (my $sw = new Gtk2::ScrolledWindow);
120			$sw->add (my $h = new Gtk2::PodViewer);
121
122			#binmode DATA, ":utf8";
123			$h->load_string (do { local $/; <DATA> });
124			}
125
126			$help->show_all;
127	root	1.12	} else {
128	root	1.43	return 0;
129	root	1.12	}
130
131	root	1.43	1
132	root	1.12	}
133
134	root	1.20	{
135	root	1.62	$viewer = new_viewer;
136			$::cur_viewer = $viewer;
137	root	1.40
138	root	1.20	$schnauzer = new_schnauzer;
139
140			$mainwin = new Gtk2::Window;
141			$mainwin->set_title ("CV");
142			$mainwin->add (my $vbox = new Gtk2::VBox);
143	root	1.53	$mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });
144	root	1.20
145			$vbox->add ($schnauzer);
146	root	1.22	$vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
147	root	1.20	$frame->add (my $hbox = new Gtk2::HBox 0, 0);
148	root	1.45	$hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
149			$hbox->pack_end (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
150			$labelwindow->add ($info = new Gtk2::Label);
151			$labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
152			$info->set (selectable => 1, xalign => 0, justify => "left");
153	root	1.25
154			$schnauzer->set_geometry_hints;
155	root	1.20	}
156	root	1.12
157			if (@ARGV) {
158	root	1.52	@ARGV == 1 && -d $ARGV[0]
159			? $schnauzer->set_dir (Glib::filename_to_unicode shift)
160			: $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV]);
161	root	1.31	$schnauzer->show_all;
162	root	1.18	$schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
163	root	1.17	} else {
164	root	1.20	$schnauzer->set_dir (File::Spec->curdir);
165	root	1.19	$mainwin->show_all;
166	root	1.12	}
167
168	root	1.35	$viewer->show_all;
169
170	root	1.12	main Gtk2;
171	root	1.21
172			__DATA__
173	root	1.12
174	root	1.58	=encoding utf-8
175
176	root	1.11	=head1 NAME
177
178	root	1.47	cv - a fast gtk+ image viewer loosely modeled after XV
179	root	1.11
180			=head1 SYNOPSIS
181
182			cv [file...]
183
184	root	1.47	=head1 FEATURES
185
186			CV is supposed to work similar to the venerable XV image viewer, just
187			faster. Why faster?
188
189			=over 4
190
191			=item * optimized directory scanning algorithm
192
193	root	1.55	The directory scanning in CV uses some tricks that - on most modern
194	root	1.47	filesystems - makes it possible to detect filetypes faster than stat()'ing
195			every file. This makes CV suitable for directories with lots of files
196			(10000+).
197
198			This algorithm is quite unprecise - it doesn't make a difference between
199			files, device nodes, symlinks and the like, and filetype detection is done
200			using the file extension only.
201
202	root	1.55	On the positive side, it is usually many orders of magnitude faster than
203			traditional scanning techniques (good for directories with 10000 or
204			100000+ files).
205
206	root	1.53	=item * queuing for all time-consuming background tasks
207
208			All tasks, such as unlinking files or generating thumbnails, that can be
209			done in the background will be done so - no waiting required, even when
210			changing directories.
211
212	root	1.47	=item * use of asynchronous I/O
213
214			CV tries to use asynchronous I/O whereever it makes sense, for example
215	root	1.53	while scanning directories, waiting for stat data, unlinking files or
216			generating thumbnails. This usually decreases scanning times for large
217			directories a bit (especially on RAID devices and over NFS) and makes CV
218			much more interactive.
219	root	1.47
220			=item * fast image loading
221
222			The time span between the user issuing a command and displaying the new
223			image should be as small as possible. CV uses optimized (especially
224			for JPEG) loading functions and sacrifices some quality (e.g no gamma
225	root	1.55	correction, although this might change) to achieve this speed.
226	root	1.47
227			=item * fast thumbnail creation
228
229	root	1.55	Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
230			on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
231			creation for JPEGs has been specially optimized and can even take
232			advantage of multiple CPUs.
233	root	1.47
234			=item * minimum optical clutter
235
236			CV has no menus or other user interface elements that take up a lot of
237	root	1.55	screen space (or are useful for beginning users). The schnauzer windows
238			can also be somewhat crowded.
239	root	1.47
240			The point of an image viewer is viewing images, not a nice GUI. This is
241			similar to XV's behaviour.
242
243			=item * efficient (and hard to learn) user interface
244
245			CV uses key combinations. A lot. If you are an experienced XV user, you
246			will find most of these keys familiar. If not, CV might be hard to use at
247			first, but will be an efficient tool later.
248
249	root	1.55	=item * multi-window GUI
250
251			CV doesn't force you to use a specific layout, instead it relies on your
252			window manager, thus enabling you to chose whatever layout that suits you
253			most.
254
255	root	1.47	=item * i18n'ed filename handling throughout
256
257			As long as glib can recognize your filename encoding (either UTF-8 or
258	root	1.55	locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
259			have the relevant fonts, CV will display your filenames correctly.
260	root	1.47
261			=item * extensible through plug-ins
262
263			I have weird plug-ins that access remote databases to find a
264			directory. This is not likely to be of any use to other people. Likewise,
265			others might have weird requirements I cannot dream of.
266
267			=item * filename clustering
268
269			Among the standard plug-ins is a filename clustering plug-in, that (in
270			case of tens of thousands images in one directory) might be able to
271			cluster similar names together.
272
273			=back
274
275	root	1.11	=head1 DESCRIPTION
276
277			=head2 THE IMAGE WINDOW
278
279			You can use the following keys in the image window:
280
281	root	1.50	q quit the program
282			< half the image size
283			> double the image size
284			, shrink the image by 10%
285			. enlarge the image by 10%
286			n reset to normal size
287			m maximize to screensize
288			M maximize to screensize, respecting image aspect
289			ctrl-m toggle maxpect-always mode
290	root	1.59	ctrl-sift-m toggle using current image size as max image size
291	root	1.50	u uncrop
292			r set scaling mode to 'nearest' (fastest)
293			s set scaling mode to 'bilinear' (default)
294			shift-s set scaling mode to 'hyper' (slowest)
295			t rotate clockwise 90°
296			T rotate counterclockwise°
297			ctrl-v open a new visual schnauzer window for the current dir
298			ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image
299	root	1.57	ctrl-p fire up the print dialog
300	root	1.50	escape cancel a crop action
301	root	1.11
302	root	1.33	And when playing movies, these additional keys are active:
303
304	root	1.50	left rewind by 10 seconds
305			right forward by 10 seconds
306			down rewind by 60 seconds
307			up forward by 60 seconds
308			pg_up rewind by 600 seconds
309			pg_down forward by 600 seconds
310			o toggle on-screen display
311			p pause/unpause
312			escape stop playing
313			9 turn volume down
314			0 turn volume up
315	root	1.33
316	root	1.47	Any other keys will be sent to the default schnauzer window, which can be
317			toggled on and off by right-clicking into the image window.
318	root	1.11
319	root	1.47	Left-clicking into the image window will let you crop the image (usually
320			to zoom into large images that CV scales down).
321	root	1.11
322			=head2 THE VISUAL SCHNAUZER
323
324			You can use the following keys in the schnauzer window:
325
326	root	1.47	ctrl-space,
327	root	1.50	space move to and display next image
328	root	1.47	ctrl-backspace,
329	root	1.50	backspace move to and display previous image
330	root	1.47	ctrl-return,
331	root	1.50	return display selected picture, or enter directory
332	root	1.11
333	root	1.50	cursor keys move selection
334			page-up move one page up
335			page-down move one page down
336			home move to first file
337			end move to last file
338
339			ctrl-a select all files
340			ctrl-shift-a select all files currently displayed in the schnauzer window
341			ctrl-d delete selected files WITHOUT ASKING AGAIN
342			ctrl-g force generation of thumbnais for the selected files
343			ctrl-s rescan current direcory or files updates/deletes etc.
344			ctrl-u update selected (or all) icons if neccessary
345			ctrl-l don't use, will become a plug-in eventually
346	root	1.47
347	root	1.56	^ go to parent directory (caret).
348
349	root	1.47	0-9,
350	root	1.50	a-z find the first filename beginning with this letter
351	root	1.47
352			Right-clicking into the schnauzer window displays a pop-up menu with
353			additional actions.
354
355	root	1.60	=head3 SELECTION
356
357			You can select entries in the Schnauzer in a variety of ways:
358
359			=over 4
360
361			=item Keyboard
362
363			Moving the cursor with the keyboard will first deselect all files and then
364			select the file you moved to.
365
366	root	1.61	=item Clicking
367	root	1.60
368	root	1.61	Clicking on an entry will select the one you clicked and deselect all
369			others.
370	root	1.60
371	root	1.61	=item Shift-Clicking
372
373			Shift-clicking will toggle the selection on the entry under the mouse.
374
375			=item Dragging
376	root	1.60
377			Dragging will select all entries between the one selected when pushing the
378			button and the one selected when releasing the button. If you move above
379			or below the schnauzer area while drag-selecting, the schnauzer will move
380			up/down one row twice per second. In addition, horizontal mouse movement
381			acts as a kind of invisible horizontal scrollbar.
382
383			=item Hint: double-click works while click-selecting
384
385			You can double-click any image while click-selecting to display it
386			without stopping the selection process. This will act as if you normally
387			double-clicked the image to display it, and will toggle the selection
388			twice, resulting in no change.
389
390			=back
391
392	root	1.47	=head1 FILES
393
394			When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
395			it were a perl script. in that, you will mostly load plug-ins.
396
397			Example:
398
399			system "fping -q -t 10 ether"
400			or require "/fs/cv/cvplugin.pl";
401
402			This will load a plug-in, but only if the machine I<ether> is reachable
403			(supposedly the plug-in is networked in some way :).
404	root	1.11
405	root	1.27	=head1 ENVIRONMENT
406
407			=over 4
408
409	root	1.38	=item CV_EDITOR
410
411			The program that gets executed when the user presses C<CTRL-e> in the
412			Schnauzer or image window. The default is C<gimp>.
413
414	root	1.27	=item CV_PRINT_DESTINATION
415
416			The default (perl-style) destination to use in the print dialog.
417
418	root	1.38	=item CV_TRASHCAN
419
420			When set, must point to a directory where all files that are deleted are
421			moved to. If unset, files that are deleted are really being deleted.
422
423	root	1.27	=back
424
425	root	1.23	=head1 SECURITY CONSIDERATIONS
426
427	root	1.54	CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
428			this purpose, though (from the gtk-2.2 release notes):
429	root	1.23
430			"While efforts have been made to make gdk-pixbuf robust against invalid
431			images, using gdk-pixbuf to load untrusted data is not recommended, due to
432			the likelyhood that there are additional problems where an invalid image
433			could cause gdk-pixbuf to crash or worse."
434
435	root	1.11	=head1 BUGS/TODO
436	root	1.23
437	root	1.47	Lots of functionality is missing.
438
439			Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
440	root	1.54	names incompatible with utf-8 might fail.
441	root	1.11
442			rotate on disk
443			lots of ui issues
444			save(?)
445			preferences
446
447			=head1 AUTHOR
448
449			Marc Lehmann <cv@plan9.de>.
450
451			=cut
452	root	1.1