[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;
         $help->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) {
   my $show_first = sub {
      $schnauzer->show_all;
      $schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
      $viewer->show_all;
   };

   @ARGV == 1 && -d $ARGV[0]
      ? $schnauzer->set_dir (Glib::filename_to_unicode shift, $show_first)
      : $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV], 1, $show_first);
} else {
   $schnauzer->set_dir (File::Spec->curdir, sub {
      $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:	1.68
Committed:	Mon Oct 23 17:52:37 2006 UTC (17 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.67:	+12 -8 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	1.67	$help->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	1.68	my $show_first = sub {
166			$schnauzer->show_all;
167			$schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
168			$viewer->show_all;
169			};
170
171	root	1.52	@ARGV == 1 && -d $ARGV[0]
172	root	1.68	? $schnauzer->set_dir (Glib::filename_to_unicode shift, $show_first)
173			: $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV], 1, $show_first);
174	root	1.17	} else {
175	root	1.68	$schnauzer->set_dir (File::Spec->curdir, sub {
176			$mainwin->show_all;
177			$viewer->show_all;
178			});
179	root	1.12	}
180
181			main Gtk2;
182	root	1.21
183			__DATA__
184	root	1.12
185	root	1.58	=encoding utf-8
186
187	root	1.11	=head1 NAME
188
189	root	1.47	cv - a fast gtk+ image viewer loosely modeled after XV
190	root	1.11
191			=head1 SYNOPSIS
192
193			cv [file...]
194
195	root	1.47	=head1 FEATURES
196
197			CV is supposed to work similar to the venerable XV image viewer, just
198			faster. Why faster?
199
200			=over 4
201
202			=item * optimized directory scanning algorithm
203
204	root	1.55	The directory scanning in CV uses some tricks that - on most modern
205	root	1.47	filesystems - makes it possible to detect filetypes faster than stat()'ing
206			every file. This makes CV suitable for directories with lots of files
207			(10000+).
208
209			This algorithm is quite unprecise - it doesn't make a difference between
210			files, device nodes, symlinks and the like, and filetype detection is done
211			using the file extension only.
212
213	root	1.55	On the positive side, it is usually many orders of magnitude faster than
214			traditional scanning techniques (good for directories with 10000 or
215			100000+ files).
216
217	root	1.53	=item * queuing for all time-consuming background tasks
218
219			All tasks, such as unlinking files or generating thumbnails, that can be
220			done in the background will be done so - no waiting required, even when
221			changing directories.
222
223	root	1.47	=item * use of asynchronous I/O
224
225			CV tries to use asynchronous I/O whereever it makes sense, for example
226	root	1.53	while scanning directories, waiting for stat data, unlinking files or
227			generating thumbnails. This usually decreases scanning times for large
228			directories a bit (especially on RAID devices and over NFS) and makes CV
229			much more interactive.
230	root	1.47
231			=item * fast image loading
232
233			The time span between the user issuing a command and displaying the new
234			image should be as small as possible. CV uses optimized (especially
235			for JPEG) loading functions and sacrifices some quality (e.g no gamma
236	root	1.55	correction, although this might change) to achieve this speed.
237	root	1.47
238			=item * fast thumbnail creation
239
240	root	1.55	Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
241			on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
242			creation for JPEGs has been specially optimized and can even take
243			advantage of multiple CPUs.
244	root	1.47
245			=item * minimum optical clutter
246
247			CV has no menus or other user interface elements that take up a lot of
248	root	1.55	screen space (or are useful for beginning users). The schnauzer windows
249			can also be somewhat crowded.
250	root	1.47
251			The point of an image viewer is viewing images, not a nice GUI. This is
252			similar to XV's behaviour.
253
254			=item * efficient (and hard to learn) user interface
255
256			CV uses key combinations. A lot. If you are an experienced XV user, you
257			will find most of these keys familiar. If not, CV might be hard to use at
258			first, but will be an efficient tool later.
259
260	root	1.55	=item * multi-window GUI
261
262			CV doesn't force you to use a specific layout, instead it relies on your
263			window manager, thus enabling you to chose whatever layout that suits you
264			most.
265
266	root	1.47	=item * i18n'ed filename handling throughout
267
268			As long as glib can recognize your filename encoding (either UTF-8 or
269	root	1.55	locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
270			have the relevant fonts, CV will display your filenames correctly.
271	root	1.47
272			=item * extensible through plug-ins
273
274			I have weird plug-ins that access remote databases to find a
275			directory. This is not likely to be of any use to other people. Likewise,
276			others might have weird requirements I cannot dream of.
277
278			=item * filename clustering
279
280			Among the standard plug-ins is a filename clustering plug-in, that (in
281			case of tens of thousands images in one directory) might be able to
282			cluster similar names together.
283
284			=back
285
286	root	1.11	=head1 DESCRIPTION
287
288			=head2 THE IMAGE WINDOW
289
290			You can use the following keys in the image window:
291
292	root	1.50	q quit the program
293			< half the image size
294			> double the image size
295			, shrink the image by 10%
296			. enlarge the image by 10%
297			n reset to normal size
298			m maximize to screensize
299			M maximize to screensize, respecting image aspect
300			ctrl-m toggle maxpect-always mode
301	root	1.59	ctrl-sift-m toggle using current image size as max image size
302	root	1.50	u uncrop
303			r set scaling mode to 'nearest' (fastest)
304			s set scaling mode to 'bilinear' (default)
305			shift-s set scaling mode to 'hyper' (slowest)
306			t rotate clockwise 90°
307			T rotate counterclockwise°
308	root	1.64	a apply all rotations loslessly to a jpeg file (using exiftran)
309	root	1.50	ctrl-v open a new visual schnauzer window for the current dir
310	root	1.63	ctrl-c clone the current image window
311	root	1.50	ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image
312	root	1.57	ctrl-p fire up the print dialog
313	root	1.50	escape cancel a crop action
314	root	1.11
315	root	1.33	And when playing movies, these additional keys are active:
316
317	root	1.50	left rewind by 10 seconds
318			right forward by 10 seconds
319			down rewind by 60 seconds
320			up forward by 60 seconds
321			pg_up rewind by 600 seconds
322			pg_down forward by 600 seconds
323			o toggle on-screen display
324			p pause/unpause
325			escape stop playing
326			9 turn volume down
327			0 turn volume up
328	root	1.33
329	root	1.47	Any other keys will be sent to the default schnauzer window, which can be
330			toggled on and off by right-clicking into the image window.
331	root	1.11
332	root	1.47	Left-clicking into the image window will let you crop the image (usually
333			to zoom into large images that CV scales down).
334	root	1.11
335			=head2 THE VISUAL SCHNAUZER
336
337	root	1.63	Any image-loading action in a schnauzer window acts on the
338			"last-recently-activated" imagewindow, which currently is simply the last
339			image window that received a keypress.
340
341	root	1.11	You can use the following keys in the schnauzer window:
342
343	root	1.47	ctrl-space,
344	root	1.50	space move to and display next image
345	root	1.47	ctrl-backspace,
346	root	1.50	backspace move to and display previous image
347	root	1.47	ctrl-return,
348	root	1.50	return display selected picture, or enter directory
349	root	1.11
350	root	1.50	cursor keys move selection
351			page-up move one page up
352			page-down move one page down
353			home move to first file
354			end move to last file
355
356			ctrl-a select all files
357			ctrl-shift-a select all files currently displayed in the schnauzer window
358			ctrl-d delete selected files WITHOUT ASKING AGAIN
359			ctrl-g force generation of thumbnais for the selected files
360			ctrl-s rescan current direcory or files updates/deletes etc.
361			ctrl-u update selected (or all) icons if neccessary
362			ctrl-l don't use, will become a plug-in eventually
363	root	1.47
364	root	1.56	^ go to parent directory (caret).
365
366	root	1.47	0-9,
367	root	1.50	a-z find the first filename beginning with this letter
368	root	1.47
369			Right-clicking into the schnauzer window displays a pop-up menu with
370			additional actions.
371
372	root	1.60	=head3 SELECTION
373
374			You can select entries in the Schnauzer in a variety of ways:
375
376			=over 4
377
378			=item Keyboard
379
380			Moving the cursor with the keyboard will first deselect all files and then
381			select the file you moved to.
382
383	root	1.61	=item Clicking
384	root	1.60
385	root	1.61	Clicking on an entry will select the one you clicked and deselect all
386			others.
387	root	1.60
388	root	1.61	=item Shift-Clicking
389
390			Shift-clicking will toggle the selection on the entry under the mouse.
391
392			=item Dragging
393	root	1.60
394			Dragging will select all entries between the one selected when pushing the
395			button and the one selected when releasing the button. If you move above
396			or below the schnauzer area while drag-selecting, the schnauzer will move
397			up/down one row twice per second. In addition, horizontal mouse movement
398			acts as a kind of invisible horizontal scrollbar.
399
400			=item Hint: double-click works while click-selecting
401
402			You can double-click any image while click-selecting to display it
403			without stopping the selection process. This will act as if you normally
404			double-clicked the image to display it, and will toggle the selection
405			twice, resulting in no change.
406
407			=back
408
409	root	1.47	=head1 FILES
410
411			When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
412			it were a perl script. in that, you will mostly load plug-ins.
413
414			Example:
415
416			system "fping -q -t 10 ether"
417			or require "/fs/cv/cvplugin.pl";
418
419			This will load a plug-in, but only if the machine I<ether> is reachable
420			(supposedly the plug-in is networked in some way :).
421	root	1.11
422	root	1.27	=head1 ENVIRONMENT
423
424			=over 4
425
426	root	1.38	=item CV_EDITOR
427
428			The program that gets executed when the user presses C<CTRL-e> in the
429			Schnauzer or image window. The default is C<gimp>.
430
431	root	1.27	=item CV_PRINT_DESTINATION
432
433			The default (perl-style) destination to use in the print dialog.
434
435	root	1.38	=item CV_TRASHCAN
436
437			When set, must point to a directory where all files that are deleted are
438			moved to. If unset, files that are deleted are really being deleted.
439
440	root	1.27	=back
441
442	root	1.23	=head1 SECURITY CONSIDERATIONS
443
444	root	1.54	CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
445			this purpose, though (from the gtk-2.2 release notes):
446	root	1.23
447			"While efforts have been made to make gdk-pixbuf robust against invalid
448			images, using gdk-pixbuf to load untrusted data is not recommended, due to
449			the likelyhood that there are additional problems where an invalid image
450			could cause gdk-pixbuf to crash or worse."
451
452	root	1.11	=head1 BUGS/TODO
453	root	1.23
454	root	1.47	Lots of functionality is missing.
455
456			Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
457	root	1.54	names incompatible with utf-8 might fail.
458	root	1.11
459			rotate on disk
460			lots of ui issues
461			save(?)
462			preferences
463
464			=head1 AUTHOR
465
466			Marc Lehmann <cv@plan9.de>.
467
468			=cut
469	root	1.1