[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 (delete_event => sub { $_[0]->destroy; 0 });
   $self->signal_connect (destroy => sub {
      $viewer = undef if $viewer == $_[0];

      main_quit Gtk2 unless --$viewer_count;

      0
   });

   $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_role ("schnauzer");
      $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;
         $w->set_role ("help");
         $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_role ("main");
   $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], 1);
   $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°
 a            apply all rotations loslessly to a jpeg file (using exiftran)
 ctrl-v       open a new visual schnauzer window for the current dir
 ctrl-c       clone the current image window
 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

Any image-loading action in a schnauzer window acts on the
"last-recently-activated" imagewindow, which currently is simply the last
image window that received a keypress.

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:	1.66
Committed:	Wed Feb 15 19:47:20 2006 UTC (18 years, 3 months ago) by root
Branch:	MAIN
Changes since 1.65:	+3 -0 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	root	1.63	$self->signal_connect (delete_event => sub { $_[0]->destroy; 0 });
76	root	1.62	$self->signal_connect (destroy => sub {
77			$viewer = undef if $viewer == $_[0];
78
79			main_quit Gtk2 unless --$viewer_count;
80	root	1.63
81			0
82	root	1.62	});
83
84			$self->signal_connect (button3_press_event => sub {
85			$mainwin->visible
86			? $mainwin->hide
87			: $mainwin->show_all;
88	root	1.63
89	root	1.62	1
90			});
91
92			Gtk2::CV::Plugin->call (new_imagewindow => $self);
93
94			$self
95			}
96
97	root	1.12	sub std_keys {
98			my $key = $_[1]->keyval;
99			my $state = $_[1]->state;
100
101	root	1.21	my $ctrl = $state * "control-mask";
102	root	1.12
103			if ($key == $Gtk2::Gdk::Keysyms{q}) {
104	root	1.62	$viewer->destroy;
105	root	1.12	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
106	root	1.20	my $w = new Gtk2::Window;
107	root	1.26
108	root	1.66	$w->set_role ("schnauzer");
109	root	1.26	$w->set_title ("CV: Schnauzer");
110	root	1.20	$w->add (my $s = new_schnauzer);
111			$s->set_dir (File::Spec->curdir);
112	root	1.25	$s->set_geometry_hints;
113	root	1.21	$w->show_all;
114	root	1.25
115	root	1.21	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
116			unless ($help) {
117			require Gtk2::PodViewer;
118
119			$help = new Gtk2::Window;
120	root	1.66	$w->set_role ("help");
121	root	1.26	$help->set_title ("CV: Help");
122	root	1.21	$help->set_default_size (500, 300);
123			$help->signal_connect (delete_event => sub { $help->hide; 1 });
124
125			$help->add (my $sw = new Gtk2::ScrolledWindow);
126			$sw->add (my $h = new Gtk2::PodViewer);
127
128			#binmode DATA, ":utf8";
129			$h->load_string (do { local $/; <DATA> });
130			}
131
132			$help->show_all;
133	root	1.12	} else {
134	root	1.43	return 0;
135	root	1.12	}
136
137	root	1.43	1
138	root	1.12	}
139
140	root	1.20	{
141	root	1.62	$viewer = new_viewer;
142			$::cur_viewer = $viewer;
143	root	1.40
144	root	1.20	$schnauzer = new_schnauzer;
145
146			$mainwin = new Gtk2::Window;
147	root	1.66	$mainwin->set_role ("main");
148	root	1.20	$mainwin->set_title ("CV");
149			$mainwin->add (my $vbox = new Gtk2::VBox);
150	root	1.53	$mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });
151	root	1.20
152			$vbox->add ($schnauzer);
153	root	1.22	$vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
154	root	1.20	$frame->add (my $hbox = new Gtk2::HBox 0, 0);
155	root	1.45	$hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
156			$hbox->pack_end (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
157			$labelwindow->add ($info = new Gtk2::Label);
158			$labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
159			$info->set (selectable => 1, xalign => 0, justify => "left");
160	root	1.25
161			$schnauzer->set_geometry_hints;
162	root	1.20	}
163	root	1.12
164			if (@ARGV) {
165	root	1.52	@ARGV == 1 && -d $ARGV[0]
166			? $schnauzer->set_dir (Glib::filename_to_unicode shift)
167	root	1.65	: $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV], 1);
168	root	1.31	$schnauzer->show_all;
169	root	1.18	$schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
170	root	1.17	} else {
171	root	1.20	$schnauzer->set_dir (File::Spec->curdir);
172	root	1.19	$mainwin->show_all;
173	root	1.12	}
174
175	root	1.35	$viewer->show_all;
176
177	root	1.12	main Gtk2;
178	root	1.21
179			__DATA__
180	root	1.12
181	root	1.58	=encoding utf-8
182
183	root	1.11	=head1 NAME
184
185	root	1.47	cv - a fast gtk+ image viewer loosely modeled after XV
186	root	1.11
187			=head1 SYNOPSIS
188
189			cv [file...]
190
191	root	1.47	=head1 FEATURES
192
193			CV is supposed to work similar to the venerable XV image viewer, just
194			faster. Why faster?
195
196			=over 4
197
198			=item * optimized directory scanning algorithm
199
200	root	1.55	The directory scanning in CV uses some tricks that - on most modern
201	root	1.47	filesystems - makes it possible to detect filetypes faster than stat()'ing
202			every file. This makes CV suitable for directories with lots of files
203			(10000+).
204
205			This algorithm is quite unprecise - it doesn't make a difference between
206			files, device nodes, symlinks and the like, and filetype detection is done
207			using the file extension only.
208
209	root	1.55	On the positive side, it is usually many orders of magnitude faster than
210			traditional scanning techniques (good for directories with 10000 or
211			100000+ files).
212
213	root	1.53	=item * queuing for all time-consuming background tasks
214
215			All tasks, such as unlinking files or generating thumbnails, that can be
216			done in the background will be done so - no waiting required, even when
217			changing directories.
218
219	root	1.47	=item * use of asynchronous I/O
220
221			CV tries to use asynchronous I/O whereever it makes sense, for example
222	root	1.53	while scanning directories, waiting for stat data, unlinking files or
223			generating thumbnails. This usually decreases scanning times for large
224			directories a bit (especially on RAID devices and over NFS) and makes CV
225			much more interactive.
226	root	1.47
227			=item * fast image loading
228
229			The time span between the user issuing a command and displaying the new
230			image should be as small as possible. CV uses optimized (especially
231			for JPEG) loading functions and sacrifices some quality (e.g no gamma
232	root	1.55	correction, although this might change) to achieve this speed.
233	root	1.47
234			=item * fast thumbnail creation
235
236	root	1.55	Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
237			on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
238			creation for JPEGs has been specially optimized and can even take
239			advantage of multiple CPUs.
240	root	1.47
241			=item * minimum optical clutter
242
243			CV has no menus or other user interface elements that take up a lot of
244	root	1.55	screen space (or are useful for beginning users). The schnauzer windows
245			can also be somewhat crowded.
246	root	1.47
247			The point of an image viewer is viewing images, not a nice GUI. This is
248			similar to XV's behaviour.
249
250			=item * efficient (and hard to learn) user interface
251
252			CV uses key combinations. A lot. If you are an experienced XV user, you
253			will find most of these keys familiar. If not, CV might be hard to use at
254			first, but will be an efficient tool later.
255
256	root	1.55	=item * multi-window GUI
257
258			CV doesn't force you to use a specific layout, instead it relies on your
259			window manager, thus enabling you to chose whatever layout that suits you
260			most.
261
262	root	1.47	=item * i18n'ed filename handling throughout
263
264			As long as glib can recognize your filename encoding (either UTF-8 or
265	root	1.55	locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
266			have the relevant fonts, CV will display your filenames correctly.
267	root	1.47
268			=item * extensible through plug-ins
269
270			I have weird plug-ins that access remote databases to find a
271			directory. This is not likely to be of any use to other people. Likewise,
272			others might have weird requirements I cannot dream of.
273
274			=item * filename clustering
275
276			Among the standard plug-ins is a filename clustering plug-in, that (in
277			case of tens of thousands images in one directory) might be able to
278			cluster similar names together.
279
280			=back
281
282	root	1.11	=head1 DESCRIPTION
283
284			=head2 THE IMAGE WINDOW
285
286			You can use the following keys in the image window:
287
288	root	1.50	q quit the program
289			< half the image size
290			> double the image size
291			, shrink the image by 10%
292			. enlarge the image by 10%
293			n reset to normal size
294			m maximize to screensize
295			M maximize to screensize, respecting image aspect
296			ctrl-m toggle maxpect-always mode
297	root	1.59	ctrl-sift-m toggle using current image size as max image size
298	root	1.50	u uncrop
299			r set scaling mode to 'nearest' (fastest)
300			s set scaling mode to 'bilinear' (default)
301			shift-s set scaling mode to 'hyper' (slowest)
302			t rotate clockwise 90°
303			T rotate counterclockwise°
304	root	1.64	a apply all rotations loslessly to a jpeg file (using exiftran)
305	root	1.50	ctrl-v open a new visual schnauzer window for the current dir
306	root	1.63	ctrl-c clone the current image window
307	root	1.50	ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image
308	root	1.57	ctrl-p fire up the print dialog
309	root	1.50	escape cancel a crop action
310	root	1.11
311	root	1.33	And when playing movies, these additional keys are active:
312
313	root	1.50	left rewind by 10 seconds
314			right forward by 10 seconds
315			down rewind by 60 seconds
316			up forward by 60 seconds
317			pg_up rewind by 600 seconds
318			pg_down forward by 600 seconds
319			o toggle on-screen display
320			p pause/unpause
321			escape stop playing
322			9 turn volume down
323			0 turn volume up
324	root	1.33
325	root	1.47	Any other keys will be sent to the default schnauzer window, which can be
326			toggled on and off by right-clicking into the image window.
327	root	1.11
328	root	1.47	Left-clicking into the image window will let you crop the image (usually
329			to zoom into large images that CV scales down).
330	root	1.11
331			=head2 THE VISUAL SCHNAUZER
332
333	root	1.63	Any image-loading action in a schnauzer window acts on the
334			"last-recently-activated" imagewindow, which currently is simply the last
335			image window that received a keypress.
336
337	root	1.11	You can use the following keys in the schnauzer window:
338
339	root	1.47	ctrl-space,
340	root	1.50	space move to and display next image
341	root	1.47	ctrl-backspace,
342	root	1.50	backspace move to and display previous image
343	root	1.47	ctrl-return,
344	root	1.50	return display selected picture, or enter directory
345	root	1.11
346	root	1.50	cursor keys move selection
347			page-up move one page up
348			page-down move one page down
349			home move to first file
350			end move to last file
351
352			ctrl-a select all files
353			ctrl-shift-a select all files currently displayed in the schnauzer window
354			ctrl-d delete selected files WITHOUT ASKING AGAIN
355			ctrl-g force generation of thumbnais for the selected files
356			ctrl-s rescan current direcory or files updates/deletes etc.
357			ctrl-u update selected (or all) icons if neccessary
358			ctrl-l don't use, will become a plug-in eventually
359	root	1.47
360	root	1.56	^ go to parent directory (caret).
361
362	root	1.47	0-9,
363	root	1.50	a-z find the first filename beginning with this letter
364	root	1.47
365			Right-clicking into the schnauzer window displays a pop-up menu with
366			additional actions.
367
368	root	1.60	=head3 SELECTION
369
370			You can select entries in the Schnauzer in a variety of ways:
371
372			=over 4
373
374			=item Keyboard
375
376			Moving the cursor with the keyboard will first deselect all files and then
377			select the file you moved to.
378
379	root	1.61	=item Clicking
380	root	1.60
381	root	1.61	Clicking on an entry will select the one you clicked and deselect all
382			others.
383	root	1.60
384	root	1.61	=item Shift-Clicking
385
386			Shift-clicking will toggle the selection on the entry under the mouse.
387
388			=item Dragging
389	root	1.60
390			Dragging will select all entries between the one selected when pushing the
391			button and the one selected when releasing the button. If you move above
392			or below the schnauzer area while drag-selecting, the schnauzer will move
393			up/down one row twice per second. In addition, horizontal mouse movement
394			acts as a kind of invisible horizontal scrollbar.
395
396			=item Hint: double-click works while click-selecting
397
398			You can double-click any image while click-selecting to display it
399			without stopping the selection process. This will act as if you normally
400			double-clicked the image to display it, and will toggle the selection
401			twice, resulting in no change.
402
403			=back
404
405	root	1.47	=head1 FILES
406
407			When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
408			it were a perl script. in that, you will mostly load plug-ins.
409
410			Example:
411
412			system "fping -q -t 10 ether"
413			or require "/fs/cv/cvplugin.pl";
414
415			This will load a plug-in, but only if the machine I<ether> is reachable
416			(supposedly the plug-in is networked in some way :).
417	root	1.11
418	root	1.27	=head1 ENVIRONMENT
419
420			=over 4
421
422	root	1.38	=item CV_EDITOR
423
424			The program that gets executed when the user presses C<CTRL-e> in the
425			Schnauzer or image window. The default is C<gimp>.
426
427	root	1.27	=item CV_PRINT_DESTINATION
428
429			The default (perl-style) destination to use in the print dialog.
430
431	root	1.38	=item CV_TRASHCAN
432
433			When set, must point to a directory where all files that are deleted are
434			moved to. If unset, files that are deleted are really being deleted.
435
436	root	1.27	=back
437
438	root	1.23	=head1 SECURITY CONSIDERATIONS
439
440	root	1.54	CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
441			this purpose, though (from the gtk-2.2 release notes):
442	root	1.23
443			"While efforts have been made to make gdk-pixbuf robust against invalid
444			images, using gdk-pixbuf to load untrusted data is not recommended, due to
445			the likelyhood that there are additional problems where an invalid image
446			could cause gdk-pixbuf to crash or worse."
447
448	root	1.11	=head1 BUGS/TODO
449	root	1.23
450	root	1.47	Lots of functionality is missing.
451
452			Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
453	root	1.54	names incompatible with utf-8 might fail.
454	root	1.11
455			rotate on disk
456			lots of ui issues
457			save(?)
458			preferences
459
460			=head1 AUTHOR
461
462			Marc Lehmann <cv@plan9.de>.
463
464			=cut
465	root	1.1