3 # fcscs - fast curses screen content select
5 # Copyright (C) 2013-2016 Simon Ruderich
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
24 use v5.10; # say, state
28 use I18N::Langinfo ();
32 our $VERSION = '0.01';
37 fcscs - fast curses screen content select
41 B<fcscs> [I<options>] I<path/to/screen/capture/file>
45 B<fcscs> is a small tool which allows quick selection of terminal screen
46 contents (like URLs, paths, regex matches, etc.) and passes the selection to
47 GNU Screen's or Tmux's buffer or any other program. The selection can then
48 quickly be pasted, e.g. in the shell. Requires GNU Screen or Tmux. It's
49 licensed under the GPL 3 or later.
57 Short overview of the general usage, details below:
60 - configure actions (optional)
63 - select mode (optional, URL mode is used on startup):
69 - select match by displayed number or <return> for lowest numbered
71 - configured action is run, e.g. URL is opened with browser
73 - perform incremental search
74 - on <return> go to `normal' mode to select a match
75 - after the match is selected wait for confirmation or extension
76 - confirmation: <return> run previously selected action
77 - extension: change match, e.g. select complete word or line
79 GNU Screen setup (add to F<~/.screenrc>):
81 bind ^B eval "hardcopy $HOME/.tmp/screen-fcscs" "screen fcscs $HOME/.tmp/screen-fcscs"
83 Tmux setup (add to F<~/.tmux.conf>):
85 bind-key C-b capture-pane \; save-buffer ~/.tmp/tmux-fcscs \; delete-buffer \; new-window "fcscs ~/.tmp/tmux-fcscs"
87 This requires a writable ~/.tmp directory. Adapt the mapping according to your
88 preferences. Ensure these files are not readable by others as they can contain
89 private data (umask or protected directory). B<fcscs> must be in your C<$PATH>
90 for the above mappings to work.
92 Pressing the configured mapping (Prefix Ctrl-B in this example) opens B<fcscs>
93 in a new GNU screen/Tmux window. After selection, the content is either passed
94 to external programs (e.g. for URLs) or copied to the paste buffer or directly
95 pasted in your previous window and the new window is closed.
97 To select a match just type its number. If the match is unique, the entry is
98 automatically selected (e.g. you press 2 and there are only 19 matches). If
99 there are multiple matches left (e.g. you press 1 and there are more than ten
100 matches available), press return to select the current match (1 in this case)
101 or another number to select the longer match. Use backspace to remove the last
104 Press return before entering a number to select the last (lowest numbered)
105 match (underlined by default). To abort without selecting any match either use
108 To change the selection mode (e.g. paths, files, etc.) use one of the mappings
109 explained below. Per default URLs are selected, see options for a way to
112 I<NOTE>: Opening URLs in the browser passes the URL via the command line which
113 leaks URLs to other users on the current system via C<ps aux> or C<top>.
115 I<NOTE>: When yanking (copying) a temporary file is used to pass the data to
116 GNU screen/Tmux without exposing it to C<ps aux> or C<top>. However this may
117 leak data if those temporary files are written to disk. To prevent this change
118 your C<$TMP> to point to a memory-only location or encrypted storage.
120 If no window appears, try running B<fcscs> manually to catch the error message
121 and please report the bug:
123 fcscs /path/to/screen-or-tmux-fcscs-file
133 # Helper class for drawing on the screen using Curses.
136 my ($class, $encoding) = @_;
138 # Prefer strict UTF-8 handling (see perldoc Encode); just in case.
139 if (lc $encoding eq 'utf8') {
142 # Get Encode object to speed up decode()/encode().
143 my $encoding_object = Encode::find_encoding($encoding);
144 die "unsupported encoding '$encoding'" unless ref $encoding_object;
146 my $curses = Curses->new or die $!;
149 encoding => $encoding,
150 encoding_object => $encoding_object,
162 # Allow default colors by passing -1 to init_pair. A default color is
163 # not drawn on screen thus allowing terminals with pseudo-transparency
164 # to use the transparent background in place of the default color.
165 Curses::use_default_colors;
184 # Convert between Perl's internal encoding and the terminal's encoding.
186 my ($self, $string) = @_;
187 return $self->{encoding_object}->encode($string);
190 my ($self, $string) = @_;
191 return eval { # returns undef on decode failure
192 $self->{encoding_object}->decode($string, Encode::FB_CROAK);
196 # Create attribute for the given fore-/background colors.
198 my ($self, $fg, $bg) = @_;
200 state $next_color_pair = 1; # must start at 1 for init_pair()
202 Curses::init_pair($next_color_pair, $fg, $bg);
203 return Curses::COLOR_PAIR($next_color_pair++);
206 # Draw a string which must fit in the current line. Wrapping/clipping is
207 # not supported and must be handled by the caller.
209 my ($self, $y, $x, $attributes, $string) = @_;
211 die if $string =~ /\n/;
212 # FIXME: wide characters
213 die if $x + length $string > $self->width;
215 $self->{curses}->attron($attributes) if defined $attributes;
216 $self->{curses}->addstr($y, $x, $self->encode($string));
217 $self->{curses}->attroff($attributes) if defined $attributes;
220 # Like draw_simple(), but the string is automatically clipped.
222 my ($self, $y, $x, $attributes, $string) = @_;
224 # FIXME: wide characters
225 $string = substr $string, 0, $self->width - $x;
226 $self->draw_simple($y, $x, $attributes, $string);
230 my ($self, $y, $x, $attributes, $string) = @_;
232 die unless defined $string;
236 # We must print each line separately. Search for next newline or
237 # line end, whichever is closer.
238 if ($string =~ /\n/) {
241 # FIXME: wide characters
242 if ($x + length $string > $self->width) {
243 my $new_offset = $self->width - $x;
244 if (not defined $offset or $offset > $new_offset) {
245 $offset = $new_offset;
248 last unless defined $offset;
250 # FIXME: wide characters
251 $self->draw_simple($y, $x, $attributes, substr $string, 0, $offset);
253 # Don't draw "\n" itself.
254 if ("\n" eq substr $string, $offset, 1) {
258 $string = substr $string, $offset;
264 $self->draw_simple($y, $x, $attributes, $string);
269 my ($self, $config) = @_;
271 $self->debug('draw_prompt', 'started');
274 my $y = $self->height - 1;
276 # Clear line for better visibility.
277 $self->draw_simple($y, $x, undef, ' ' x $self->width);
280 if (defined (my $s = $self->{prompt}{flags})) {
282 $self->debug('draw_prompt', $s);
283 $self->draw_clipped($y, $x, $config->{attribute}{prompt_flags}, $s);
284 $x += length($s) + 1; # space between next element
287 if (defined (my $s = $self->{prompt}{name})) {
289 $self->debug('draw_prompt', $s);
290 $self->draw_clipped($y, $x, $config->{attribute}{prompt_name}, $s);
291 $x += length($s) + 1;
293 # Draw prompt value, e.g. a search field.
294 if (defined (my $s = $self->{prompt}{value})) {
295 $self->debug('draw_prompt', $s);
296 $self->draw_clipped($y, $x, undef, $s);
297 $x += length($s) + 1;
303 my ($self, $config, $matches_remove, $matches_add) = @_;
305 foreach (@{$matches_remove}) {
306 $self->draw($_->{y}, $_->{x}, Curses::A_NORMAL, $_->{string});
309 my $attr_id = $config->{attribute}{match_id};
310 my $attr_string = $config->{attribute}{match_string};
311 my $attr_last = $config->{attribute}{match_last};
313 foreach (@{$matches_add}) {
314 my $attr = (defined $_->{id} and $_->{id} == 1)
317 $self->draw($_->{y}, $_->{x}, $attr, $_->{string});
318 if (defined $_->{id}) {
319 $self->draw($_->{y}, $_->{x}, $attr_id, $_->{id});
326 my ($self, @args) = @_;
328 my $attr = $self->color_pair(Curses::COLOR_RED, -1) | Curses::A_BOLD;
330 # Clear the screen to improve visibility of the error message.
331 $self->{curses}->clear;
333 my $y = $self->draw(0, 0, $attr, "@args");
335 if ($self->{debug}) {
338 require Devel::StackTrace;
341 $msg = "Devel::StackTrace missing, no stack trace.\n";
343 my $trace = Devel::StackTrace->new;
344 $msg = "Stack trace:\n" . $trace->as_string;
346 $y = $self->draw($y + 1, 0, Curses::A_NORMAL, $msg);
349 $self->draw($y + 1, 0, Curses::A_NORMAL,
350 'Press any key to terminate fcscs.');
358 my ($self, $module, @args) = @_;
360 return if not $self->{debug};
362 state $fh; # only open the file once per run
363 if (not defined $fh) {
364 # Ignore errors if the directory doesn't exist.
365 if (not open $fh, '>', "$ENV{HOME}/.config/fcscs/log") {
366 $fh = undef; # a failed open still writes a value to $fh
372 $_ = $self->encode($_);
374 say $fh "$module: @args";
380 my ($self, %settings) = @_;
382 foreach (keys %settings) {
383 CORE::die if not exists $self->{prompt}{$_};
384 $self->{prompt}{$_} = $settings{$_};
389 # Wrapper for Curses.
390 sub width { return $Curses::COLS; }
391 sub height { return $Curses::LINES; }
392 sub refresh { return $_[0]->{curses}->refresh; }
393 sub getch { return $_[0]->{curses}->getch; }
394 sub cursor { Curses::curs_set($_[1]); return; }
402 my ($screen, $input_ref) = @_;
404 # Make sure the input fits on the screen by removing the top lines if
406 splice @{$input_ref}, 0, -$screen->height;
408 # Pad each line with spaces to the screen width to correctly handle
409 # multi-line regexes.
410 # FIXME: wide characters
411 my @padded = map { sprintf '%-*s', $screen->width, $_ } @{$input_ref};
413 my $string = join "\n", @padded;
417 width => $screen->width + 1,
418 # + 1 = "\n", used in input_match_offset_to_coordinates
422 sub input_match_offset_to_coordinates {
423 my ($width, $offset) = @_;
425 die unless defined $offset;
427 my $y = int($offset / $width);
428 my $x = $offset - $y * $width;
432 sub get_regex_matches {
433 my ($input, $regex) = @_;
436 while ($input->{string} =~ /$regex/g) {
438 die "Match group required in regex '$regex'" if not defined $offset;
440 my ($x, $y) = input_match_offset_to_coordinates($input->{width},
442 push @matches, { x => $x, y => $y, offset => $offset, string => $1 };
449 my ($screen, $config, $cmd) = @_;
451 $screen->debug('run_command', "running @{$cmd}");
454 # Perl's system() combined with a $SIG{__WARN__} which die()s has
455 # issues due to the fork. The die() in the __WARN__ handler doesn't
456 # die but the program continues after the system().
458 # If the forked process fails to exec (e.g. program not found) then
459 # the __WARN__ handler is called (because a warning is about to be
460 # displayed) and the die() should display a message and terminate the
461 # process. But due to the fork it doesn't terminate the parent process
462 # and instead changes the return value of system(); it's no longer -1
463 # which makes it impossible to detect that case.
465 # Perl < 5.18 (found in 5.14) doesn't setup $$ during system() which
466 # makes it impossible to detect if the handler was called from inside
469 # Instead, just ignore any warnings during the system(). Thanks to
470 # mauke in #perl on Freenode (2013-10-29 23:30 CET) for the idea to
471 # use no warnings and anno for testing a more recent Perl version with
475 my @cmd = map { $screen->encode($_) } @{$cmd};
476 system { $cmd[0] } @cmd;
481 $msg = 'failed to execute: ' . $!;
483 $msg = 'killed by signal ' . ($? & 127);
485 $msg = 'exited with code ' . ($? >> 8);
487 die "system(@{$cmd}) $msg.";
491 sub run_in_background {
492 my ($screen, $sub) = @_;
494 $screen->debug('run_in_background', "running $sub");
497 defined $pid or die $!;
500 # The terminal multiplexer sends a SIGHUP to the process when it
501 # closes the window (because the parent process has exited).
502 local $SIG{HUP} = 'IGNORE';
504 # Necessary for GNU screen or it'll keep the window open until the
505 # paste command has run.
506 close STDIN or die $!;
507 close STDOUT or die $!;
508 close STDERR or die $!;
510 # Double-fork to prevent zombies.
512 defined $pid or die $!;
513 if ($pid == 0) { # child
518 waitpid $pid, 0 or die $!;
524 my ($name, $screen, $config, $input, $matches) = @_;
526 $screen->debug('select_match', 'started');
528 return if @{$matches} == 0;
529 # Don't return on initial run to give the user a chance to select another
530 # mode, e.g. to switch from URL selection to search selection.
531 if (@{$matches} == 1 and not $config->{state}{initial}) {
532 return { match => $matches->[0] };
534 $config->{state}{initial} = 0;
536 my @sorted = sort { $b->{y} <=> $a->{y} or $b->{x} <=> $a->{x} } @{$matches};
543 $screen->prompt(name => $name, value => undef);
544 $screen->draw_prompt($config);
546 $screen->draw_matches($config, [], $matches);
551 my $char = $screen->getch;
552 if ($char =~ /^\d$/) {
553 $number = $number * 10 + $char;
554 } elsif ($char eq "\b" or $char eq "\x7f") { # backspace
555 $number = int($number / 10);
556 } elsif ($char eq "\n"
557 or $char eq $config->{setting}{alternative_return}) {
558 if ($number == 0) { # number without selection matches last entry
563 # Selecting a new mode requires falling through into the main input
564 # loop and then starting the new mode.
565 } elsif (defined $config->{mapping}{mode}{$char}) {
566 $screen->draw_matches($config, $matches, []); # clear matches
567 return { key => $char };
568 # All other mappings stay in the current mode.
569 } elsif (defined (my $m = $config->{mapping}{simple}{$char})) {
570 $m->($char, $screen, $config, $input);
574 next; # ignore unknown mappings
577 last if $number > 0 and $number * 10 > @{$matches}; # unique match
579 my @remaining = $number == 0
581 : grep { $_->{id} =~ /^$number/ } @{$matches};
582 $screen->draw_matches($config, $matches, \@remaining);
586 $screen->draw_matches($config, $matches, []); # remove matches
588 foreach (@{$matches}) {
589 return { match => $_ } if $_->{id} == $number;
591 $screen->debug('select_match', 'no match selected');
592 return { match => undef };
595 sub extend_match_regex_left {
596 my ($line, $match, $regex) = @_;
598 my $s = reverse substr $line, 0, $match->{x};
599 if ($s =~ /^($regex)/) {
600 $match->{string} = reverse($1) . $match->{string};
601 $match->{x} -= length $1;
602 $match->{offset} -= length $1;
606 sub extend_match_regex_right {
607 my ($line, $match, $regex) = @_;
609 my $s = substr $line, $match->{x} + length $match->{string};
610 if ($s =~ /^($regex)/) {
611 $match->{string} .= $1;
616 my ($screen, $config, $input, $match) = @_;
618 $screen->debug('extend_match', 'started');
620 return if not defined $match;
622 $screen->prompt(name => 'extend', value => undef);
623 $screen->draw_prompt($config);
625 delete $match->{id}; # don't draw any match ids
626 $screen->draw_matches($config, [], [$match]);
629 my $line = $input->{lines}[$match->{y}];
632 my $match_old = \%{$match};
634 my $char = $screen->getch;
636 or $char eq $config->{setting}{alternative_return}) {
639 } elsif ($char eq 'w') { # select current word (both directions)
640 extend_match_regex_left($line, $match, qr/\w+/);
641 extend_match_regex_right($line, $match, qr/\w+/);
642 } elsif ($char eq 'b') { # select current word (only left)
643 extend_match_regex_left($line, $match, qr/\w+/);
644 } elsif ($char eq 'e') { # select current word (only right)
645 extend_match_regex_right($line, $match, qr/\w+/);
647 } elsif ($char eq 'W') { # select current WORD (both directions)
648 extend_match_regex_left($line, $match, qr/\S+/);
649 extend_match_regex_right($line, $match, qr/\S+/);
650 } elsif ($char eq 'B') { # select current WORD (only left)
651 extend_match_regex_left($line, $match, qr/\S+/);
652 } elsif ($char eq 'E') { # select current WORD (only right)
653 extend_match_regex_right($line, $match, qr/\S+/);
655 } elsif ($char eq '0') { # select to beginning of line
656 extend_match_regex_left($line, $match, qr/.+/);
657 } elsif ($char eq '$') { # select to end of line
658 extend_match_regex_right($line, $match, qr/.+/);
660 # Allow mode changes if not overwritten by local mappings.
661 } elsif (defined $config->{mapping}{mode}{$char}) {
662 $screen->draw_matches($config, [$match_old], []); # clear match
663 return { key => $char };
666 next; # ignore unknown mappings
669 $screen->draw_matches($config, [$match_old], [$match]);
673 $screen->debug('extend_match', 'done');
675 return { match => $match };
680 my ($key, $screen, $config, $input) = @_;
682 $screen->debug('mapping_paste', 'started');
684 $config->{state}{handler} = $config->{handler}{paste};
686 $screen->prompt(flags => 'P'); # paste
687 $screen->draw_prompt($config);
693 my ($key, $screen, $config, $input) = @_;
695 $screen->debug('mapping_yank', 'started');
697 $config->{state}{handler} = $config->{handler}{yank};
699 $screen->prompt(flags => 'Y'); # yank
700 $screen->draw_prompt($config);
709 Normal modes select matches by calling a function which returns them, e.g. by
712 The following normal modes are available:
716 =item B<path mode> select relative/absolute paths
718 =item B<url mode> select URLs
723 sub mapping_mode_path {
724 my ($key, $screen, $config, $input) = @_;
726 $screen->debug('mapping_mode_path', 'started');
728 my @matches = get_regex_matches($input, $config->{regex}{path});
730 select => 'path select',
731 matches => \@matches,
732 handler => $config->{handler}{yank},
735 sub mapping_mode_url {
736 my ($key, $screen, $config, $input) = @_;
738 $screen->debug('mapping_mode_url', 'started');
740 my @matches = get_regex_matches($input, $config->{regex}{url});
742 select => 'url select',
743 matches => \@matches,
744 handler => $config->{handler}{url},
748 =head2 SEARCH MODE (AND EXTEND MODE)
750 Search mode is a special mode which lets you type a search string (a Perl
751 regex) and then select one of the matches. Afterwards you can extend the
752 match. For example select the complete word or to the end of the line. This
753 allows quick selection of arbitrary text.
755 The following mappings are available during the extension mode (not
756 configurable at the moment):
760 =item B<w> select current word
762 =item B<b> extend word to the left
764 =item B<e> extend word to the right
766 =item B<W> select current WORD
768 =item B<B> extend WORD to the left
770 =item B<E> extend WORD to the right
772 =item B<0> extend to beginning of line
774 =item B<$> extend to end of line
778 C<word> includes any characters matching C<\w+>, C<WORD> any non-whitespace
779 characters (C<\S+>), just like in Vim.
782 sub mapping_mode_search {
783 my ($key, $screen, $config, $input) = @_;
785 $screen->debug('mapping_mode_search', 'started');
789 my $search = ''; # encoded
792 # getch doesn't return decoded characters but raw input bytes. Wait
793 # until the input character is complete.
794 my $value = $screen->decode($search);
795 $value = '' unless defined $value; # undef on decode failure
797 $screen->prompt(name => 'search', value => $value);
798 $screen->draw_prompt($config);
801 my $char = $screen->getch;
802 # TODO: readline editing support
805 } elsif ($char eq "\b" or $char eq "\x7f") { # backspace
806 # Remove a character, not a byte.
807 $search = $screen->decode($search);
809 $search = $screen->encode($search);
812 next unless defined $screen->decode($search);
818 if (($config->{setting}{smartcase} and $search eq lc $search)
819 or $config->{setting}{ignorecase}) {
822 # Ignore invalid regexps.
823 # TODO: display warning on error?
825 @matches = get_regex_matches($input, qr/($case$search)/);
828 $screen->draw_matches($config, \@last_matches, \@matches);
829 @last_matches = @matches;
836 matches => \@last_matches,
838 handler => $config->{handler}{yank},
843 my ($key, $screen, $config, $input) = @_;
845 # Key is necessary to fall through to main event loop which then quits.
846 return { key => $key, quit => 1 };
851 my ($screen, $config, $match) = @_;
853 $screen->debug('handler_yank', 'started');
857 # Use a temporary file to prevent leaking the yanked data to other users
858 # with the command line, e.g. ps aux or top.
859 my ($fh, $tmp) = File::Temp::tempfile(); # dies on its own
860 print $fh $screen->encode($match->{value});
863 if ($config->{setting}{multiplexer} eq 'screen') {
864 $screen->debug('handler_yank', 'using screen');
866 # GNU screen displays an annoying "Slurping X characters into buffer".
867 # Use 'msgwait 0' as a hack to disable it.
868 my $msgwait = $config->{setting}{screen_msgwait};
869 run_command($screen, $config, ['screen', '-X', 'msgwait', 0]);
870 run_command($screen, $config, ['screen', '-X', 'readbuf', $tmp]);
871 run_command($screen, $config, ['screen', '-X', 'msgwait', $msgwait]);
872 } elsif ($config->{setting}{multiplexer} eq 'tmux') {
873 $screen->debug('handler_yank', 'using tmux');
875 run_command($screen, $config, ['tmux', 'load-buffer', $tmp]);
877 die 'unsupported multiplexer';
880 unlink $tmp or die $!;
884 my ($screen, $config, $match) = @_;
886 $screen->debug('handler_paste', 'started');
891 if ($config->{setting}{multiplexer} eq 'screen') {
892 $screen->debug('handler_paste', 'using screen');
893 @cmd = qw( screen -X paste . );
894 } elsif ($config->{setting}{multiplexer} eq 'tmux') {
895 $screen->debug('handler_paste', 'using tmux');
896 @cmd = qw( tmux paste-buffer );
898 die 'unsupported multiplexer';
901 run_in_background($screen, sub {
902 # We need to get the data in the paste buffer before we can paste
904 handler_yank($screen, $config, $match);
906 # Sleep until we switch back to the current window.
907 Time::HiRes::usleep($config->{setting}{paste_sleep});
909 run_command($screen, $config, \@cmd);
914 my ($screen, $config, $match) = @_;
916 $screen->debug('handler_url', "opening $match->{value}");
918 run_in_background($screen, sub {
919 my @cmd = ( @{$config->{setting}{browser}}, $match->{value} );
920 run_command($screen, $config, \@cmd);
927 # CONFIGURATION DEFAULTS
931 fcscs is configured through F<~/.fcscsrc> or F<~/.config/fcscs/fcscsrc> which
932 is a normal Perl script with all of Perl's usual features.
934 All configuration values are stored in the hash C<%config>. All manually
935 defined keys overwrite the default settings.
937 A simple F<~/.fcscsrc> could look like this (for details about the used
943 use Curses; # for COLOR_* and A_* constants
947 # Draw matches in blue.
948 $config{attribute}{match_string} = color_pair(COLOR_BLUE, -1);
949 # Enable Vim-like 'smartcase', ignore case until an upper character is
951 $config{setting}{smartcase} = 1;
953 # Use chromium to open URLs if running under X, elinks otherwise.
954 if (defined $ENV{DISPLAY}) {
955 $config{setting}{browser} = ['chromium'];
957 $config{setting}{browser} = ['elinks'];
960 # Let fcscs know the file was loaded successfully.
968 Pod::Usage::pod2usage(2);
972 # Determine terminal encoding from the environment ($ENV{LANG} or similar).
973 my $encoding = I18N::Langinfo::langinfo(I18N::Langinfo::CODESET);
975 my $screen = Screen->init($encoding);
977 # We must restore the screen before exiting.
978 local $SIG{INT} = sub {
982 # Make all warnings fatal to make sure they don't get lost (stderr is normally
984 local $SIG{__WARN__} = sub {
985 $screen->die('warning', @_);
992 I<NOTE>: Mappings are split in two categories: Mode mappings which change the
993 selection and may receive additional input (e.g. a search string) and simple
994 mappings which only change some value. Mode mappings are configured via
995 C<$config{mapping}{mode}>, simple mappings via C<$config{mapping}{simple}>.
997 The following mode mappings are available by default (the function to remap
998 them in parentheses):
1002 =item B<f> select absolute/relative paths (C<\&mapping_mode_path>)
1004 =item B<u> select URLs (C<\&mapping_mode_url>)
1006 =item B</> search for regex to get selection (C<\&mapping_mode_search>)
1008 =item B<q> quit fcscs (C<\&mapping_quit>)
1012 The following simple mappings are available by default:
1016 =item B<p> enable pasting (C<\&mapping_paste>)
1018 =item B<y> enable yanking (copying) (C<\&mapping_yank>)
1022 The following additional mappings are available by default:
1026 =item B<\n> accept current selection (not customizable)
1028 =item B<s> additional key to accept selection (B<alternative_return> option)
1032 All (single-byte) keys except numbers, backspace and return can be mapped.
1034 Unknown mappings are ignored when pressing keys.
1036 To remove a default mapping, delete it from the mapping hash.
1040 # Map 'p' to select paths, 'P' to enable pasting.
1041 $config{mapping}{mode}{p} = \&mapping_mode_path;
1042 $config{mapping}{simple}{P} = \&mapping_paste;
1044 # Disable 'f' mapping.
1045 delete $config{mapping}{mode}{f};
1048 my %mapping_mode = (
1049 f => \&mapping_mode_path,
1050 u => \&mapping_mode_url,
1051 '/' => \&mapping_mode_search,
1052 q => \&mapping_quit,
1054 my %mapping_simple = (
1055 p => \&mapping_paste,
1056 y => \&mapping_yank,
1061 Attributes are used to style the output. They must be Curses attributes.
1062 Defaults in parentheses (foreground, background, attribute).
1066 =item B<match_id> attribute for match numbers (red, default, bold)
1068 =item B<match_string> attribute for matches (yellow, default, normal)
1070 =item B<match_last> attribute for the match selected by return (yellow, default, underline)
1072 =item B<prompt_name> attribute for prompt name (standout)
1074 =item B<prompt_flags> attribute for prompt flags (standout)
1080 # Draw prompt flags in bold red with default background color.
1081 $config{attribute}{prompt_flags}
1083 | color_pair(Curses::COLOR_RED, -1);
1087 match_id => $screen->color_pair(Curses::COLOR_RED, -1)
1089 match_string => $screen->color_pair(Curses::COLOR_YELLOW, -1),
1090 match_last => $screen->color_pair(Curses::COLOR_YELLOW, -1)
1091 | Curses::A_UNDERLINE,
1092 prompt_name => Curses::A_STANDOUT,
1093 prompt_flags => Curses::A_STANDOUT,
1098 Defaults in parentheses.
1102 =item B<debug> enable debug mode, writes to I<~/.config/fcscs/log> (C<0>)
1104 =item B<initial_mode> start in this mode, must be a valid mode mapping (C<\&mapping_mode_url>)
1106 =item B<multiplexer> set multiplexer ("screen" or "tmux") if not autodetected (C<undef>)
1108 =item B<ignorecase> ignore case when searching (C<0>)
1110 =item B<smartcase> ignore case unless one uppercase character is searched (C<1>)
1112 =item B<paste_sleep> sleep x us before running paste command (C<100_000>)
1114 =item B<screen_msgwait> GNU Screen's msgwait variable, used when yanking (C<5>)
1116 =item B<alternative_return> additional accept key like return, set to C<\n> to disable (C<s>)
1118 =item B<browser> browser command as array reference (C<['x-www-browser']>)
1124 # Select paths on startup instead of URLs.
1125 $config{setting}{initial_mode} = \&mapping_mode_path;
1131 initial_mode => \&mapping_mode_url,
1132 multiplexer => undef,
1135 paste_sleep => 100_000,
1136 screen_msgwait => 5,
1138 alternative_return => 's',
1140 browser => ['x-www-browser'],
1147 =item B<url> used by C<\&mapping_mode_url()>
1149 =item B<path> used by C<\&mapping_mode_path()>
1155 # Select all non-whitespace characters when searching for paths.
1156 $config{regex}{path} = qr{(\S+)};
1160 # Taken from urlview's default configuration file, thanks.
1161 url => qr{((?:(?:(?:http|https|ftp|gopher)|mailto):(?://)?[^ <>"\t]*|(?:www|ftp)[0-9]?\.[-a-z0-9.]+)[^ .,;\t\n\r<">\):]?[^, <>"\t]*[^ .,;\t\n\r<">\):])},
1162 path => qr{(~?[a-zA-Z0-9_./-]*/[a-zA-Z0-9_./-]+)},
1167 Handlers are used to perform actions on the selected string.
1169 The following handlers are available, defaults in parentheses.
1173 =item B<yank> used to yank (copy) selection to paste buffer (C<\&handler_yank>)
1175 =item B<paste> used to paste selection into window (C<\&handler_paste>)
1177 =item B<url> used to open URLs (e.g. in a browser) (C<\&handler_url>)
1183 # Download YouTube videos with a custom wrapper, handle all other URLs
1184 # with the default URL handler.
1185 $config{handler}{url} = sub {
1186 my ($screen, $config, $match) = @_;
1188 if ($match->{value} =~ m{^https://www.youtube.com/}) {
1189 return run_in_background($screen, sub {
1190 run_command($screen, $config,
1191 ['youtube-dl-wrapper', $match->{value}]);
1199 yank => \&handler_yank,
1200 paste => \&handler_paste,
1201 url => \&handler_url,
1205 initial => 1, # used by select_match() for 'initial_mode'
1211 # CONFIGURATION "API"
1215 The following functions are available:
1217 color_pair($fg, $bg)
1219 Create a new Curses attribute with the given fore- and background color.
1223 mapping_mode_search()
1229 Used as mappings, see L</MAPPINGS> above.
1235 Used as handler to yank, paste selection or open URL in browser.
1243 Helper functions when writing custom mappings, see the source for details.
1251 # All variables and functions which are usable by ~/.fcscsrc.
1253 our $screen; # "private"
1256 sub color_pair { return $screen->color_pair(@_); }
1258 sub mapping_mode_path { return main::mapping_mode_path(@_); }
1259 sub mapping_mode_url { return main::mapping_mode_url(@_); }
1260 sub mapping_mode_search { return main::mapping_mode_search(@_); }
1262 sub mapping_paste { return main::mapping_paste(@_); }
1263 sub mapping_yank { return main::mapping_yank(@_); }
1264 sub mapping_quit { return main::mapping_quit(@_); }
1266 sub handler_yank { return main::handler_yank(@_); }
1267 sub handler_paste { return main::handler_paste(@_); }
1268 sub handler_url { return main::handler_url(@_); }
1270 sub debug { return main::debug(@_); }
1272 sub get_regex_matches { return main::get_regex_matches(@_); }
1273 sub select_match { return main::select_match(@_); }
1275 sub run_command { return main::run_command(@_); }
1276 sub run_in_background { return main::run_in_background(@_); }
1278 $Fcscs::screen = $screen;
1284 # Alias %config and %Fcscs::config. %config is less to type.
1286 local *config = \%Fcscs::config;
1288 $config{mapping}{mode} = \%mapping_mode;
1289 $config{mapping}{simple} = \%mapping_simple;
1290 $config{attribute} = \%attribute;
1291 $config{setting} = \%setting;
1292 $config{regex} = \%regex;
1293 $config{handler} = \%handler;
1294 $config{state} = \%state;
1297 my @configs = ("$ENV{HOME}/.fcscsrc",
1298 "$ENV{HOME}/.config/fcscs/fcscsrc");
1299 foreach my $path (@configs) {
1300 my $decoded = $screen->decode($path);
1302 # Load configuration file. Checks have a race condition if the home
1303 # directory is writable by an attacker (but then the user is screwed
1305 next unless -e $path;
1307 $screen->die("Config '$decoded' not owned by current user!");
1309 # Make sure the file is not writable by other users. Doesn't handle
1310 # ACLs and see comment above about race conditions.
1311 my @stat = stat $path or die $!;
1312 my $mode = $stat[2];
1313 if (($mode & Fcntl::S_IWGRP) or ($mode & Fcntl::S_IWOTH)) {
1314 die "Config '$decoded' must not be writable by other users.";
1317 my $result = do $path;
1319 $screen->die("Failed to parse '$decoded': $@") if $@;
1320 $screen->die("Failed to do '$decoded': $!") unless defined $result;
1321 $screen->die("Failed to run '$decoded'.");
1324 last; # success, don't load more files
1327 $screen->{debug} = $config{setting}{debug};
1333 # Auto-detect current multiplexer.
1334 if (not defined $config{setting}{multiplexer}) {
1335 if (defined $ENV{STY} and defined $ENV{TMUX}) {
1336 die 'Found both $STY and $TMUX, set $config{setting}{multiplexer}.';
1337 } elsif (defined $ENV{STY}) {
1338 $config{setting}{multiplexer} = 'screen';
1339 } elsif (defined $ENV{TMUX}) {
1340 $config{setting}{multiplexer} = 'tmux';
1342 die 'No multiplexer found.';
1346 my $binmode = $encoding;
1347 # GNU screen stores the screen dump for unknown reasons as ISO-8859-1
1348 # instead of the currently active encoding.
1349 if ($config{setting}{multiplexer} eq 'screen') {
1350 $binmode = 'ISO-8859-1';
1354 open my $fh, '<', $ARGV[0] or die $!;
1355 binmode $fh, ":encoding($binmode)" or die $!;
1358 push @input_lines, $_;
1360 close $fh or die $!;
1362 my $input = prepare_input($screen, \@input_lines);
1364 # Display original screen content.
1366 foreach (@{$input->{lines}}) {
1367 $screen->draw_simple($y++, 0, undef, $_);
1372 my $mapping = $config{setting}{initial_mode};
1376 if (not defined $mapping) {
1377 $key = $screen->getch unless defined $key;
1378 $screen->debug('input', "got key '$key'");
1380 $mapping = $config{mapping}{mode}{$key};
1381 $mapping = $config{mapping}{simple}{$key} unless defined $mapping;
1382 if (not defined $mapping) { # ignore unknown mappings
1388 $screen->debug('input', 'running mapping');
1389 my $result = $mapping->($key, $screen, \%config, $input);
1393 if (defined $result->{quit}) {
1394 $screen->debug('input', 'quitting');
1397 if (defined $result->{key}) {
1398 $key = $result->{key}; # lookup another mapping
1399 $screen->debug('input', "processing new key: '$key'");
1402 if (defined $result->{select}) {
1403 $screen->debug('input', 'selecting match');
1405 $result = select_match($result->{select},
1406 $screen, \%config, $input,
1407 $result->{matches});
1408 $result->{handler} = $tmp->{handler};
1409 $result->{extend} = $tmp->{extend};
1410 goto RESULT; # reprocess special entries in result
1412 if (defined $result->{extend}) {
1413 $screen->debug('input', 'extending match');
1414 $result = extend_match($screen, \%config, $input,
1416 goto RESULT; # reprocess special entries in result
1418 if (defined $result->{match}) {
1419 if (not defined $result->{match}{value}) {
1420 $result->{match}{value} = $result->{match}{string};
1423 $screen->debug('input', 'running handler');
1425 # Choose handler with falling priority.
1427 $config{state}{handler}, # set by user
1428 $result->{match}{handler}, # set by match
1429 $result->{handler}, # set by mapping
1430 $config{handler}{yank}, # fallback
1432 foreach my $handler (@handlers) {
1433 next unless defined $handler;
1435 $handler->($screen, \%config, $result->{match});
1441 $key = undef; # get next key from user
1466 Invalid arguments/options.
1472 Simon Ruderich E<lt>simon@ruderich.orgE<gt>
1474 =head1 LICENSE AND COPYRIGHT
1476 Copyright (C) 2013-2016 by Simon Ruderich
1478 This program is free software: you can redistribute it and/or modify
1479 it under the terms of the GNU General Public License as published by
1480 the Free Software Foundation, either version 3 of the License, or
1481 (at your option) any later version.
1483 This program is distributed in the hope that it will be useful,
1484 but WITHOUT ANY WARRANTY; without even the implied warranty of
1485 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1486 GNU General Public License for more details.
1488 You should have received a copy of the GNU General Public License
1489 along with this program. If not, see E<lt>http://www.gnu.org/licenses/E<gt>.
1493 L<screen(1)>, L<tmux(1)>, L<urlview(1)>