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. To abort without selecting any match either use "q".
107 To change the selection mode (e.g. paths, files, etc.) use one of the mappings
108 explained below. Per default URLs are selected, see options for a way to
111 I<NOTE>: When yanking (copying) a temporary file is used to pass the data to
112 GNU screen/Tmux without exposing it to C<ps aux> or C<top>. However this may
113 leak data if those temporary files are written to disk. To prevent this change
114 your C<$TMP> to point to a memory-only location or encrypted storage.
116 If no window appears, try running B<fcscs> manually to catch the error message
117 and please report the bug:
119 fcscs /path/to/screen-or-tmux-fcscs-file
129 # Helper class for drawing on the screen using Curses.
132 my ($class, $encoding) = @_;
134 # Prefer strict UTF-8 handling (see perldoc Encode); just in case.
135 if (lc $encoding eq 'utf8') {
138 # Get Encode object to speed up decode()/encode().
139 my $encoding_object = Encode::find_encoding($encoding);
140 die "unsupported encoding '$encoding'" unless ref $encoding_object;
142 my $curses = Curses->new or die $!;
145 encoding => $encoding,
146 encoding_object => $encoding_object,
158 # Allow default colors by passing -1 to init_pair. A default color is
159 # not drawn on screen thus allowing terminals with pseudo-transparency
160 # to use the transparent background in place of the default color.
161 Curses::use_default_colors;
180 # Convert between Perl's internal encoding and the terminal's encoding.
182 my ($self, $string) = @_;
183 return $self->{encoding_object}->encode($string);
186 my ($self, $string) = @_;
187 return eval { # returns undef on decode failure
188 $self->{encoding_object}->decode($string, Encode::FB_CROAK);
192 # Create attribute for the given fore-/background colors.
194 my ($self, $fg, $bg) = @_;
196 state $next_color_pair = 1; # must start at 1 for init_pair()
198 Curses::init_pair($next_color_pair, $fg, $bg);
199 return Curses::COLOR_PAIR($next_color_pair++);
202 # Draw a string which must fit in the current line. Wrapping/clipping is
203 # not supported and must be handled by the caller.
205 my ($self, $y, $x, $attributes, $string) = @_;
207 die if $string =~ /\n/;
208 # FIXME: wide characters
209 die if $x + length $string > $self->width;
211 $self->{curses}->attron($attributes) if defined $attributes;
212 $self->{curses}->addstr($y, $x, $self->encode($string));
213 $self->{curses}->attroff($attributes) if defined $attributes;
216 # Like draw_simple(), but the string is automatically clipped.
218 my ($self, $y, $x, $attributes, $string) = @_;
220 # FIXME: wide characters
221 $string = substr $string, 0, $self->width - $x;
222 $self->draw_simple($y, $x, $attributes, $string);
226 my ($self, $y, $x, $attributes, $string) = @_;
228 die unless defined $string;
232 # We must print each line separately. Search for next newline or
233 # line end, whichever is closer.
234 if ($string =~ /\n/) {
237 # FIXME: wide characters
238 if ($x + length $string > $self->width) {
239 my $new_offset = $self->width - $x;
240 if (not defined $offset or $offset > $new_offset) {
241 $offset = $new_offset;
244 last unless defined $offset;
246 # FIXME: wide characters
247 $self->draw_simple($y, $x, $attributes, substr $string, 0, $offset);
249 # Don't draw "\n" itself.
250 if ("\n" eq substr $string, $offset, 1) {
254 $string = substr $string, $offset;
260 $self->draw_simple($y, $x, $attributes, $string);
265 my ($self, $config) = @_;
268 my $y = $self->height - 1;
270 # Clear line for better visibility.
271 $self->draw_simple($y, $x, undef, ' ' x $self->width);
274 if (defined (my $s = $self->{prompt}{flags})) {
276 $self->draw_clipped($y, $x, $config->{attribute}{prompt_flags}, $s);
277 $x += length($s) + 1; # space between next element
280 if (defined (my $s = $self->{prompt}{name})) {
282 $self->draw_clipped($y, $x, $config->{attribute}{prompt_name}, $s);
283 $x += length($s) + 1;
285 # Draw prompt value, e.g. a search field.
286 if (defined (my $s = $self->{prompt}{value})) {
287 $self->draw_clipped($y, $x, undef, $s);
288 $x += length($s) + 1;
294 my ($self, $config, $matches_remove, $matches_add) = @_;
296 foreach (@{$matches_remove}) {
297 $self->draw($_->{y}, $_->{x}, Curses::A_NORMAL, $_->{string});
300 my $attr_id = $config->{attribute}{match_id};
301 my $attr_string = $config->{attribute}{match_string};
303 foreach (@{$matches_add}) {
304 $self->draw($_->{y}, $_->{x}, $attr_string, $_->{string});
305 if (defined $_->{id}) {
306 $self->draw($_->{y}, $_->{x}, $attr_id, $_->{id});
313 my ($self, @args) = @_;
315 my $attr = $self->color_pair(Curses::COLOR_RED, -1) | Curses::A_BOLD;
317 # Clear the screen to improve visibility of the error message.
318 $self->{curses}->clear;
320 my $y = $self->draw(0, 0, $attr, "@args");
322 if ($self->{debug}) {
325 require Devel::StackTrace;
328 $msg = "Devel::StackTrace missing, no stack trace.\n";
330 my $trace = Devel::StackTrace->new;
331 $msg = "Stack trace:\n" . $trace->as_string;
333 $y = $self->draw($y + 1, 0, Curses::A_NORMAL, $msg);
336 $self->draw($y + 1, 0, Curses::A_NORMAL,
337 'Press any key to terminate fcscs.');
345 my ($self, $module, @args) = @_;
347 return if not $self->{debug};
349 state $fh; # only open the file once per run
350 if (not defined $fh) {
351 # Ignore errors if the directory doesn't exist.
352 if (not open $fh, '>', "$ENV{HOME}/.config/fcscs/log") {
353 $fh = undef; # a failed open still writes a value to $fh
359 $_ = $self->encode($_);
361 say $fh "$module: @args";
367 my ($self, %settings) = @_;
369 foreach (keys %settings) {
370 CORE::die if not exists $self->{prompt}{$_};
371 $self->{prompt}{$_} = $settings{$_};
376 # Wrapper for Curses.
377 sub width { return $Curses::COLS; }
378 sub height { return $Curses::LINES; }
379 sub refresh { return $_[0]->{curses}->refresh; }
380 sub getch { return $_[0]->{curses}->getch; }
381 sub cursor { Curses::curs_set($_[1]); return; }
389 my ($screen, $input_ref) = @_;
391 # Make sure the input fits on the screen by removing the top lines if
393 splice @{$input_ref}, 0, -$screen->height;
395 # Pad each line with spaces to the screen width to correctly handle
396 # multi-line regexes.
397 # FIXME: wide characters
398 my @padded = map { sprintf '%-*s', $screen->width, $_ } @{$input_ref};
400 my $string = join "\n", @padded;
404 width => $screen->width + 1,
405 # + 1 = "\n", used in input_match_offset_to_coordinates
409 sub input_match_offset_to_coordinates {
410 my ($width, $offset) = @_;
412 die unless defined $offset;
414 my $y = int($offset / $width);
415 my $x = $offset - $y * $width;
419 sub get_regex_matches {
420 my ($input, $regex) = @_;
423 while ($input->{string} =~ /$regex/g) {
425 die "Match group required in regex '$regex'" if not defined $offset;
427 my ($x, $y) = input_match_offset_to_coordinates($input->{width},
429 push @matches, { x => $x, y => $y, offset => $offset, string => $1 };
436 my ($screen, $config, $cmd) = @_;
438 $screen->debug('run_command', "running @{$cmd}");
441 # Perl's system() combined with a $SIG{__WARN__} which die()s has
442 # issues due to the fork. The die() in the __WARN__ handler doesn't
443 # die but the program continues after the system().
445 # If the forked process fails to exec (e.g. program not found) then
446 # the __WARN__ handler is called (because a warning is about to be
447 # displayed) and the die() should display a message and terminate the
448 # process. But due to the fork it doesn't terminate the parent process
449 # and instead changes the return value of system(); it's no longer -1
450 # which makes it impossible to detect that case.
452 # Perl < 5.18 (found in 5.14) doesn't setup $$ during system() which
453 # makes it impossible to detect if the handler was called from inside
456 # Instead, just ignore any warnings during the system(). Thanks to
457 # mauke in #perl on Freenode (2013-10-29 23:30 CET) for the idea to
458 # use no warnings and anno for testing a more recent Perl version with
462 my @cmd = map { $screen->encode($_) } @{$cmd};
463 system { $cmd[0] } @cmd;
468 $msg = 'failed to execute: ' . $!;
470 $msg = 'killed by signal ' . ($? & 127);
472 $msg = 'exited with code ' . ($? >> 8);
474 die "system(@{$cmd}) $msg.";
478 sub run_in_background {
479 my ($screen, $sub) = @_;
481 $screen->debug('run_in_background', "running $sub");
484 defined $pid or die $!;
487 # The terminal multiplexer sends a SIGHUP to the process when it
488 # closes the window (because the parent process has exited).
489 local $SIG{HUP} = 'IGNORE';
491 # Necessary for GNU screen or it'll keep the window open until the
492 # paste command has run.
493 close STDIN or die $!;
494 close STDOUT or die $!;
495 close STDERR or die $!;
497 # Double-fork to prevent zombies.
499 defined $pid or die $!;
500 if ($pid == 0) { # child
505 waitpid $pid, 0 or die $!;
511 my ($name, $screen, $config, $input, $matches) = @_;
513 $screen->debug('select_match', 'started');
515 return if @{$matches} == 0;
516 # Don't return on initial run to give the user a chance to select another
517 # mode, e.g. to switch from URL selection to search selection.
518 if (@{$matches} == 1 and not $config->{state}{initial}) {
519 return { match => $matches->[0] };
521 $config->{state}{initial} = 0;
523 my @sorted = sort { $b->{y} <=> $a->{y} or $b->{x} <=> $a->{x} } @{$matches};
530 $screen->prompt(name => $name, value => undef);
531 $screen->draw_prompt($config);
533 $screen->draw_matches($config, [], $matches);
538 my $char = $screen->getch;
539 if ($char =~ /^\d$/) {
540 $number = $number * 10 + $char;
541 } elsif ($char eq "\b" or $char eq "\x7f") { # backspace
542 $number = int($number / 10);
543 } elsif ($char eq "\n") {
544 if ($number == 0) { # number without selection matches last entry
549 # Selecting a new mode requires falling through into the main input
550 # loop and then starting the new mode.
551 } elsif (defined $config->{mapping}{mode}{$char}) {
552 $screen->draw_matches($config, $matches, []); # clear matches
553 return { key => $char };
554 # All other mappings stay in the current mode.
555 } elsif (defined (my $m = $config->{mapping}{simple}{$char})) {
556 $m->($char, $screen, $config, $input);
560 next; # ignore unknown mappings
563 last if $number > 0 and $number * 10 > @{$matches}; # unique match
565 my @remaining = $number == 0
567 : grep { $_->{id} =~ /^$number/ } @{$matches};
568 $screen->draw_matches($config, $matches, \@remaining);
572 $screen->draw_matches($config, $matches, []); # remove matches
574 foreach (@{$matches}) {
575 return { match => $_ } if $_->{id} == $number;
577 $screen->debug('select_match', 'no match selected');
578 return { match => undef };
581 sub extend_match_regex_left {
582 my ($line, $match, $regex) = @_;
584 my $s = reverse substr $line, 0, $match->{x};
585 if ($s =~ /^($regex)/) {
586 $match->{string} = reverse($1) . $match->{string};
587 $match->{x} -= length $1;
588 $match->{offset} -= length $1;
592 sub extend_match_regex_right {
593 my ($line, $match, $regex) = @_;
595 my $s = substr $line, $match->{x} + length $match->{string};
596 if ($s =~ /^($regex)/) {
597 $match->{string} .= $1;
602 my ($screen, $config, $input, $match) = @_;
604 $screen->debug('extend_match', 'started');
606 $screen->prompt(name => 'extend', value => undef);
607 $screen->draw_prompt($config);
609 delete $match->{id}; # don't draw any match ids
610 $screen->draw_matches($config, [], [$match]);
613 my $line = $input->{lines}[$match->{y}];
616 my $match_old = \%{$match};
618 my $char = $screen->getch;
619 if ($char eq "\n") { # accept match
622 } elsif ($char eq 'w') { # select current word (both directions)
623 extend_match_regex_left($line, $match, qr/\w+/);
624 extend_match_regex_right($line, $match, qr/\w+/);
625 } elsif ($char eq 'b') { # select current word (only left)
626 extend_match_regex_left($line, $match, qr/\w+/);
627 } elsif ($char eq 'e') { # select current word (only right)
628 extend_match_regex_right($line, $match, qr/\w+/);
630 } elsif ($char eq 'W') { # select current WORD (both directions)
631 extend_match_regex_left($line, $match, qr/\S+/);
632 extend_match_regex_right($line, $match, qr/\S+/);
633 } elsif ($char eq 'B') { # select current WORD (only left)
634 extend_match_regex_left($line, $match, qr/\S+/);
635 } elsif ($char eq 'E') { # select current WORD (only right)
636 extend_match_regex_right($line, $match, qr/\S+/);
638 } elsif ($char eq '^') { # select to beginning of line
639 extend_match_regex_left($line, $match, qr/.+/);
640 } elsif ($char eq '$') { # select to end of line
641 extend_match_regex_right($line, $match, qr/.+/);
643 # Allow mode changes if not overwritten by local mappings.
644 } elsif (defined $config->{mapping}{mode}{$char}) {
645 $screen->draw_matches($config, [$match_old], []); # clear match
646 return { key => $char };
649 next; # ignore unknown mappings
652 $screen->draw_matches($config, [$match_old], [$match]);
656 $screen->debug('extend_match', 'done');
658 return { match => $match };
663 my ($key, $screen, $config, $input) = @_;
665 $screen->debug('mapping_paste', 'started');
667 $config->{state}{handler} = $config->{handler}{paste};
669 $screen->prompt(flags => 'P'); # paste
670 $screen->draw_prompt($config);
676 my ($key, $screen, $config, $input) = @_;
678 $screen->debug('mapping_yank', 'started');
680 $config->{state}{handler} = $config->{handler}{yank};
682 $screen->prompt(flags => 'Y'); # yank
683 $screen->draw_prompt($config);
692 Normal modes select matches by calling a function which returns them, e.g. by
695 The following normal modes are available:
699 =item B<path mode> select relative/absolute paths
701 =item B<url mode> select URLs
706 sub mapping_mode_path {
707 my ($key, $screen, $config, $input) = @_;
709 $screen->debug('mapping_mode_path', 'started');
711 my @matches = get_regex_matches($input, $config->{regex}{path});
713 select => 'path select',
714 matches => \@matches,
715 handler => $config->{handler}{yank},
718 sub mapping_mode_url {
719 my ($key, $screen, $config, $input) = @_;
721 $screen->debug('mapping_mode_url', 'started');
723 my @matches = get_regex_matches($input, $config->{regex}{url});
725 select => 'url select',
726 matches => \@matches,
727 handler => $config->{handler}{url},
731 =head2 SEARCH MODE (AND EXTEND MODE)
733 Search mode is a special mode which lets you type a search string (a Perl
734 regex) and then select one of the matches. Afterwards you can extend the
735 match. For example select the complete word or to the end of the line. This
736 allows quick selection of arbitrary text.
738 The following mappings are available during the extension mode (not
739 configurable at the moment):
743 =item B<w> select current word
745 =item B<b> extend word to the left
747 =item B<e> extend word to the right
749 =item B<W> select current WORD
751 =item B<B> extend WORD to the left
753 =item B<E> extend WORD to the right
755 =item B<^> extend to beginning of line
757 =item B<$> extend to end of line
761 C<word> includes any characters matching C<\w+>, C<WORD> any non-whitespace
762 characters (C<\S+>), just like in Vim.
765 sub mapping_mode_search {
766 my ($key, $screen, $config, $input) = @_;
768 $screen->debug('mapping_mode_search', 'started');
772 my $search = ''; # encoded
775 # getch doesn't return decoded characters but raw input bytes. Wait
776 # until the input character is complete.
777 my $value = $screen->decode($search);
778 $value = '' unless defined $value; # undef on decode failure
780 $screen->prompt(name => 'search', value => $value);
781 $screen->draw_prompt($config);
784 my $char = $screen->getch;
785 # TODO: readline editing support
788 } elsif ($char eq "\b" or $char eq "\x7f") { # backspace
789 # Remove a character, not a byte.
790 $search = $screen->decode($search);
792 $search = $screen->encode($search);
795 next unless defined $screen->decode($search);
801 if (($config->{setting}{smartcase} and $search eq lc $search)
802 or $config->{setting}{ignorecase}) {
805 # Ignore invalid regexps.
806 # TODO: display warning on error?
808 @matches = get_regex_matches($input, qr/($case$search)/);
811 $screen->draw_matches($config, \@last_matches, \@matches);
812 @last_matches = @matches;
819 matches => \@last_matches,
821 handler => $config->{handler}{yank},
826 my ($key, $screen, $config, $input) = @_;
828 # Key is necessary to fall through to main event loop which then quits.
829 return { key => $key, quit => 1 };
834 my ($screen, $config, $match) = @_;
836 $screen->debug('handler_yank', 'started');
840 # Use a temporary file to prevent leaking the yanked data to other users
841 # with the command line, e.g. ps aux or top.
842 my ($fh, $tmp) = File::Temp::tempfile(); # dies on its own
843 print $fh $screen->encode($match->{value});
846 if ($config->{setting}{multiplexer} eq 'screen') {
847 $screen->debug('handler_yank', 'using screen');
849 # GNU screen displays an annoying "Slurping X characters into buffer".
850 # Use 'msgwait 0' as a hack to disable it.
851 my $msgwait = $config->{setting}{screen_msgwait};
852 run_command($screen, $config, ['screen', '-X', 'msgwait', 0]);
853 run_command($screen, $config, ['screen', '-X', 'readbuf', $tmp]);
854 run_command($screen, $config, ['screen', '-X', 'msgwait', $msgwait]);
855 } elsif ($config->{setting}{multiplexer} eq 'tmux') {
856 $screen->debug('handler_yank', 'using tmux');
858 run_command($screen, $config, ['tmux', 'load-buffer', $tmp]);
860 die 'unsupported multiplexer';
863 unlink $tmp or die $!;
867 my ($screen, $config, $match) = @_;
869 $screen->debug('handler_paste', 'started');
874 if ($config->{setting}{multiplexer} eq 'screen') {
875 $screen->debug('handler_paste', 'using screen');
876 @cmd = qw( screen -X paste . );
877 } elsif ($config->{setting}{multiplexer} eq 'tmux') {
878 $screen->debug('handler_paste', 'using tmux');
879 @cmd = qw( tmux paste-buffer );
881 die 'unsupported multiplexer';
884 run_in_background($screen, sub {
885 # We need to get the data in the paste buffer before we can paste
887 handler_yank($screen, $config, $match);
889 # Sleep until we switch back to the current window.
890 Time::HiRes::usleep($config->{setting}{paste_sleep});
892 run_command($screen, $config, \@cmd);
897 my ($screen, $config, $match) = @_;
899 $screen->debug('handler_url', "opening $match->{value}");
901 run_in_background($screen, sub {
902 my @cmd = ( @{$config->{setting}{browser}}, $match->{value} );
903 run_command($screen, $config, \@cmd);
910 # CONFIGURATION DEFAULTS
914 fcscs is configured through F<~/.fcscsrc> or F<~/.config/fcscs/fcscsrc> which
915 is a normal Perl script with all of Perl's usual features.
917 All configuration values are stored in the hash C<%config>. All manually
918 defined keys overwrite the default settings.
920 A simple F<~/.fcscsrc> could look like this (for details about the used
926 use Curses; # for COLOR_* and A_* constants
930 # Draw matches in blue.
931 $config{attribute}{match_string} = color_pair(COLOR_BLUE, -1);
932 # Enable Vim-like 'smartcase', ignore case until an upper character is
934 $config{setting}{smartcase} = 1;
936 # Use chromium to open URLs if running under X, elinks otherwise.
937 if (defined $ENV{DISPLAY}) {
938 $config{setting}{browser} = ['chromium'];
940 $config{setting}{browser} = ['elinks'];
943 # Let fcscs know the file was loaded successfully.
951 Pod::Usage::pod2usage(2);
955 # Determine terminal encoding from the environment ($ENV{LANG} or similar).
956 my $encoding = I18N::Langinfo::langinfo(I18N::Langinfo::CODESET);
958 my $screen = Screen->init($encoding);
960 # We must restore the screen before exiting.
961 local $SIG{INT} = sub {
965 # Make all warnings fatal to make sure they don't get lost (stderr is normally
967 local $SIG{__WARN__} = sub {
968 $screen->die('warning', @_);
975 I<NOTE>: Mappings are split in two categories: Mode mappings which change the
976 selection and may receive additional input (e.g. a search string) and simple
977 mappings which only change some value. Mode mappings are configured via
978 C<$config{mapping}{mode}>, simple mappings via C<$config{mapping}{simple}>.
980 The following mode mappings are available by default (the function to remap
981 them in parentheses):
985 =item B<f> select absolute/relative paths (C<\&mapping_mode_path>)
987 =item B<u> select URLs (C<\&mapping_mode_url>)
989 =item B</> search for regex to get selection (C<\&mapping_mode_search>)
991 =item B<q> quit fcscs (C<\&mapping_quit>)
995 The following simple mappings are available by default:
999 =item B<p> enable pasting (C<\&mapping_paste>)
1001 =item B<y> enable yanking (copying) (C<\&mapping_yank>)
1005 All (single-byte) keys except numbers, backspace and return can be mapped.
1007 Unknown mappings are ignored when pressing keys.
1009 To remove a default mapping, delete it from the mapping hash.
1013 # Map 'p' to select paths, 'P' to enable pasting.
1014 $config{mapping}{mode}{p} = \&mapping_mode_path;
1015 $config{mapping}{simple}{P} = \&mapping_paste;
1017 # Disable 'f' mapping.
1018 delete $config{mapping}{mode}{f};
1021 my %mapping_mode = (
1022 f => \&mapping_mode_path,
1023 u => \&mapping_mode_url,
1024 '/' => \&mapping_mode_search,
1025 q => \&mapping_quit,
1027 my %mapping_simple = (
1028 p => \&mapping_paste,
1029 y => \&mapping_yank,
1034 Attributes are used to style the output. They must be Curses attributes.
1035 Defaults in parentheses (foreground, background, attribute).
1039 =item B<match_id> attribute for match numbers (red, default, bold)
1041 =item B<match_string> attribute for matches (yellow, default, normal)
1043 =item B<prompt_name> attribute for prompt name (standout)
1045 =item B<prompt_flags> attribute for prompt flags (standout)
1051 # Draw prompt flags in bold red with default background color.
1052 $config{attribute}{prompt_flags}
1054 | color_pair(Curses::COLOR_RED, -1);
1058 match_id => $screen->color_pair(Curses::COLOR_RED, -1)
1060 match_string => $screen->color_pair(Curses::COLOR_YELLOW, -1),
1061 prompt_name => Curses::A_STANDOUT,
1062 prompt_flags => Curses::A_STANDOUT,
1067 Defaults in parentheses.
1071 =item B<debug> enable debug mode, writes to I<~/.config/fcscs/log> (C<0>)
1073 =item B<initial_mode> start in this mode, must be a valid mode mapping (C<\&mapping_mode_url>)
1075 =item B<multiplexer> set multiplexer ("screen" or "tmux") if not autodetected (C<undef>)
1077 =item B<ignorecase> ignore case when searching (C<0>)
1079 =item B<smartcase> ignore case unless one uppercase character is searched (C<1>)
1081 =item B<paste_sleep> sleep x us before running paste command (C<100_000>)
1083 =item B<screen_msgwait> GNU Screen's msgwait variable, used when yanking (C<5>)
1085 =item B<browser> browser command as array reference (C<['x-www-browser']>)
1091 # Select paths on startup instead of URLs.
1092 $config{setting}{initial_mode} = \&mapping_mode_path;
1098 initial_mode => \&mapping_mode_url,
1099 multiplexer => undef,
1102 paste_sleep => 100_000,
1103 screen_msgwait => 5,
1105 browser => ['x-www-browser'],
1112 =item B<url> used by C<\&mapping_mode_url()>
1114 =item B<path> used by C<\&mapping_mode_path()>
1120 # Select all non-whitespace characters when searching for paths.
1121 $config{regex}{path} = qr{(\S+)};
1125 # Taken from urlview's default configuration file, thanks.
1126 url => qr{((?:(?:(?:http|https|ftp|gopher)|mailto):(?://)?[^ <>"\t]*|(?:www|ftp)[0-9]?\.[-a-z0-9.]+)[^ .,;\t\n\r<">\):]?[^, <>"\t]*[^ .,;\t\n\r<">\):])},
1127 path => qr{(~?[a-zA-Z0-9_./-]*/[a-zA-Z0-9_./-]+)},
1132 Handlers are used to perform actions on the selected string.
1134 The following handlers are available, defaults in parentheses.
1138 =item B<yank> used to yank (copy) selection to paste buffer (C<\&handler_yank>)
1140 =item B<paste> used to paste selection into window (C<\&handler_paste>)
1142 =item B<url> used to open URLs (e.g. in a browser) (C<\&handler_url>)
1148 # Download YouTube videos with a custom wrapper, handle all other URLs
1149 # with the default URL handler.
1150 $config{handler}{url} = sub {
1151 my ($screen, $config, $match) = @_;
1153 if ($match->{value} =~ m{^https://www.youtube.com/}) {
1154 return run_in_background($screen, sub {
1155 run_command($screen, $config,
1156 ['youtube-dl-wrapper', $match->{value}]);
1164 yank => \&handler_yank,
1165 paste => \&handler_paste,
1166 url => \&handler_url,
1170 initial => 1, # used by select_match() for 'initial_mode'
1176 # CONFIGURATION "API"
1180 The following functions are available:
1182 color_pair($fg, $bg)
1184 Create a new Curses attribute with the given fore- and background color.
1188 mapping_mode_search()
1194 Used as mappings, see L</MAPPINGS> above.
1200 Used as handler to yank, paste selection or open URL in browser.
1208 Helper functions when writing custom mappings, see the source for details.
1216 # All variables and functions which are usable by ~/.fcscsrc.
1218 our $screen; # "private"
1221 sub color_pair { return $screen->color_pair(@_); }
1223 sub mapping_mode_path { return main::mapping_mode_path(@_); }
1224 sub mapping_mode_url { return main::mapping_mode_url(@_); }
1225 sub mapping_mode_search { return main::mapping_mode_search(@_); }
1227 sub mapping_paste { return main::mapping_paste(@_); }
1228 sub mapping_yank { return main::mapping_yank(@_); }
1229 sub mapping_quit { return main::mapping_quit(@_); }
1231 sub handler_yank { return main::handler_yank(@_); }
1232 sub handler_paste { return main::handler_paste(@_); }
1233 sub handler_url { return main::handler_url(@_); }
1235 sub debug { return main::debug(@_); }
1237 sub get_regex_matches { return main::get_regex_matches(@_); }
1238 sub select_match { return main::select_match(@_); }
1240 sub run_command { return main::run_command(@_); }
1241 sub run_in_background { return main::run_in_background(@_); }
1243 $Fcscs::screen = $screen;
1249 # Alias %config and %Fcscs::config. %config is less to type.
1251 local *config = \%Fcscs::config;
1253 $config{mapping}{mode} = \%mapping_mode;
1254 $config{mapping}{simple} = \%mapping_simple;
1255 $config{attribute} = \%attribute;
1256 $config{setting} = \%setting;
1257 $config{regex} = \%regex;
1258 $config{handler} = \%handler;
1259 $config{state} = \%state;
1262 my @configs = ("$ENV{HOME}/.fcscsrc",
1263 "$ENV{HOME}/.config/fcscs/fcscsrc");
1264 foreach my $path (@configs) {
1265 my $decoded = $screen->decode($path);
1267 # Load configuration file. Checks have a race condition if the home
1268 # directory is writable by an attacker (but then the user is screwed
1270 next unless -e $path;
1272 $screen->die("Config '$decoded' not owned by current user!");
1274 # Make sure the file is not writable by other users. Doesn't handle
1275 # ACLs and see comment above about race conditions.
1276 my @stat = stat $path or die $!;
1277 my $mode = $stat[2];
1278 if (($mode & Fcntl::S_IWGRP) or ($mode & Fcntl::S_IWOTH)) {
1279 die "Config '$decoded' must not be writable by other users.";
1282 my $result = do $path;
1284 $screen->die("Failed to parse '$decoded': $@") if $@;
1285 $screen->die("Failed to do '$decoded': $!") unless defined $result;
1286 $screen->die("Failed to run '$decoded'.");
1289 last; # success, don't load more files
1292 $screen->{debug} = $config{setting}{debug};
1298 # Auto-detect current multiplexer.
1299 if (not defined $config{setting}{multiplexer}) {
1300 if (defined $ENV{STY} and defined $ENV{TMUX}) {
1301 die 'Found both $STY and $TMUX, set $config{setting}{multiplexer}.';
1302 } elsif (defined $ENV{STY}) {
1303 $config{setting}{multiplexer} = 'screen';
1304 } elsif (defined $ENV{TMUX}) {
1305 $config{setting}{multiplexer} = 'tmux';
1307 die 'No multiplexer found.';
1311 my $binmode = $encoding;
1312 # GNU screen stores the screen dump for unknown reasons as ISO-8859-1
1313 # instead of the currently active encoding.
1314 if ($config{setting}{multiplexer} eq 'screen') {
1315 $binmode = 'ISO-8859-1';
1319 open my $fh, '<', $ARGV[0] or die $!;
1320 binmode $fh, ":encoding($binmode)" or die $!;
1323 push @input_lines, $_;
1325 close $fh or die $!;
1327 my $input = prepare_input($screen, \@input_lines);
1329 # Display original screen content.
1331 foreach (@{$input->{lines}}) {
1332 $screen->draw_simple($y++, 0, undef, $_);
1337 my $mapping = $config{setting}{initial_mode};
1341 if (not defined $mapping) {
1342 $key = $screen->getch unless defined $key;
1343 $screen->debug('input', "got key '$key'");
1345 $mapping = $config{mapping}{mode}{$key};
1346 $mapping = $config{mapping}{simple}{$key} unless defined $mapping;
1347 if (not defined $mapping) { # ignore unknown mappings
1353 $screen->debug('input', 'running mapping');
1354 my $result = $mapping->($key, $screen, \%config, $input);
1358 if (defined $result->{quit}) {
1359 $screen->debug('input', 'quitting');
1362 if (defined $result->{key}) {
1363 $key = $result->{key}; # lookup another mapping
1364 $screen->debug('input', "processing new key: '$key'");
1367 if (defined $result->{select}) {
1368 $screen->debug('input', 'selecting match');
1370 $result = select_match($result->{select},
1371 $screen, \%config, $input,
1372 $result->{matches});
1373 $result->{handler} = $tmp->{handler};
1374 $result->{extend} = $tmp->{extend};
1375 goto RESULT; # reprocess special entries in result
1377 if (defined $result->{extend}) {
1378 $screen->debug('input', 'extending match');
1379 $result = extend_match($screen, \%config, $input,
1381 goto RESULT; # reprocess special entries in result
1383 if (defined $result->{match}) {
1384 if (not defined $result->{match}{value}) {
1385 $result->{match}{value} = $result->{match}{string};
1388 $screen->debug('input', 'running handler');
1390 # Choose handler with falling priority.
1392 $config{state}{handler}, # set by user
1393 $result->{match}{handler}, # set by match
1394 $result->{handler}, # set by mapping
1395 $config{handler}{yank}, # fallback
1397 foreach my $handler (@handlers) {
1398 next unless defined $handler;
1400 $handler->($screen, \%config, $result->{match});
1406 $key = undef; # get next key from user
1431 Invalid arguments/options.
1437 Simon Ruderich E<lt>simon@ruderich.orgE<gt>
1439 =head1 LICENSE AND COPYRIGHT
1441 Copyright (C) 2013-2016 by Simon Ruderich
1443 This program is free software: you can redistribute it and/or modify
1444 it under the terms of the GNU General Public License as published by
1445 the Free Software Foundation, either version 3 of the License, or
1446 (at your option) any later version.
1448 This program is distributed in the hope that it will be useful,
1449 but WITHOUT ANY WARRANTY; without even the implied warranty of
1450 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1451 GNU General Public License for more details.
1453 You should have received a copy of the GNU General Public License
1454 along with this program. If not, see E<lt>http://www.gnu.org/licenses/E<gt>.
1458 L<screen(1)>, L<tmux(1)>, L<urlview(1)>