From d780757754f710460d7fe2acb010261208c97afa Mon Sep 17 00:00:00 2001 From: Simon Ruderich Date: Sat, 23 Jan 2016 17:14:36 +0100 Subject: [PATCH 1/1] initial commit --- .gitignore | 7 + Build.PL | 43 ++ COPYING | 674 ++++++++++++++++++++++++++++ MANIFEST | 6 + bin/fcscs | 1232 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 1962 insertions(+) create mode 100644 .gitignore create mode 100644 Build.PL create mode 100644 COPYING create mode 100644 MANIFEST create mode 100755 bin/fcscs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..eaa8254 --- /dev/null +++ b/.gitignore @@ -0,0 +1,7 @@ +/Build +/META.json +/META.yml +/MYMETA.json +/MYMETA.yml +/_build/ +/blib/ diff --git a/Build.PL b/Build.PL new file mode 100644 index 0000000..57f0ad4 --- /dev/null +++ b/Build.PL @@ -0,0 +1,43 @@ +#!/usr/bin/perl + +# Copyright (C) 2016 Simon Ruderich +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + + +use strict; +use warnings; + +use Module::Build; + +my $build = Module::Build->new( + module_name => 'fcscs', + dist_author => 'Simon Ruderich ', + dist_version_from => 'bin/fcscs', + license => 'gpl', # gpl_3 is spec 2, not used by Module::Build + requires => { + 'Curses' => 0, + # Bundled with perl. + 'Encode' => 0, + 'Fcntl' => 0, + 'File::Temp' => 0, + 'I18N::Langinfo' => 0, + 'Pod::Usage' => 0, + 'Time::HiRes' => 0, + }, + configure_requires => { + 'Module::Build' => 0, + }, +); +$build->create_build_script; diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/MANIFEST b/MANIFEST new file mode 100644 index 0000000..ec97f27 --- /dev/null +++ b/MANIFEST @@ -0,0 +1,6 @@ +bin/fcscs +Build.PL +COPYING +MANIFEST This list of files +META.json +META.yml diff --git a/bin/fcscs b/bin/fcscs new file mode 100755 index 0000000..054842a --- /dev/null +++ b/bin/fcscs @@ -0,0 +1,1232 @@ +#!/usr/bin/perl + +# fcscs - fast curses screen content select + +# Copyright (C) 2013-2016 Simon Ruderich +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + + +use strict; +use warnings; + +use v5.10; # say, state + +use Encode (); +use Fcntl (); +use I18N::Langinfo (); + +use Curses (); + +our $VERSION = '0.01'; + + +=head1 NAME + +fcscs - fast curses screen content select + +=head1 SYNOPSIS + +B [I] I + +=head1 DESCRIPTION + +B is a small tool which allows quick selection of terminal screen +contents (like URLs, paths, regex matches, etc.) and passes the selection to +GNU Screen's or Tmux's buffer or any other program. The selection can then +quickly be pasted, e.g. in the shell. Requires GNU Screen or Tmux. It's +licensed under the GPL 3 or later. + +=head1 OPTIONS + +None so far. + +=head1 USAGE + +GNU Screen setup (add to F<~/.screenrc>): + + bind ^B eval "hardcopy $HOME/.tmp/screen-fcscs" "screen fcscs $HOME/.tmp/screen-fcscs" + +Tmux setup (add to F<~/.tmux.conf>): + + bind-key C-b capture-pane \; save-buffer ~/.tmp/tmux-fcscs \; delete-buffer \; new-window "fcscs ~/.tmp/tmux-fcscs" + +This requires a writable ~/.tmp directory. Adapt the mapping according to your +preferences. Ensure these files are not readable by others as they can contain +private data (umask or protected directory). B must be in your C<$PATH> +for the above mappings to work. + +Pressing the configured mapping (Prefix Ctrl-B in this example) opens B +in a new GNU screen/Tmux window. After selection, the content is either passed +to external programs (e.g. for URLs) or copied to the paste buffer or directly +pasted in your previous window and the new window is closed. + +To select a match just type its number. If the match is unique, the entry is +automatically selected (e.g. you press 2 and there are only 19 matches). If +there are multiple matches left (e.g. you press 1 and there are more than ten +matches available), press return to select the current match (1 in this case) +or another number to select the longer match. Use backspace to remove the last +entered number. + +Press return before entering a number to select the last (lowest numbered) +match. To abort without selecting any match either use "q". + +To change the selection mode (e.g. paths, files, etc.) use one of the mappings +explained below. Per default URLs are selected, see options for a way to +change this. + +I: When yanking (copying) a temporary file is used to pass the data to +GNU screen/Tmux without exposing it to C or C. However this may +leak data if those temporary files are written to disk. To prevent this change +your C<$TMP> accordingly to point to a memory-only location or encrypted +storage. + +If no window appears, try running B manually to catch the error message +and please report the bug: + + fcscs /path/to/screen-or-tmux-fcscs-file + +=cut + + +# CLASSES + +# Helper class for drawing on the screen using Curses. +package Screen { + sub init { + my ($class, $encoding) = @_; + + # Prefer strict UTF-8 handling (see perldoc Encode); just in case. + if (lc $encoding eq 'utf8') { + $encoding = 'UTF-8'; + } + # Get Encode object to speed up decode()/encode(). + my $encoding_object = Encode::find_encoding($encoding); + die "unsupported encoding '$encoding'" unless ref $encoding_object; + + my $curses = Curses->new or die $!; + + my $self = { + encoding => $encoding, + encoding_object => $encoding_object, + curses => $curses, + debug => 0, + prompt => { + flags => undef, + name => undef, + value => undef, + }, + }; + bless $self, $class; + + Curses::start_color; + # Allow default colors by passing -1 to init_pair. A default color is + # not drawn on screen thus allowing terminals with pseudo-transparency + # to use the transparent background in place of the default color. + Curses::use_default_colors; + + Curses::cbreak; + Curses::noecho; + $self->cursor(0); + + return $self; + } + sub deinit { + my ($self) = @_; + + Curses::nocbreak; + Curses::echo; + $self->cursor(1); + + Curses::endwin; + return; + } + + # Convert between Perl's internal encoding and the terminal's encoding. + sub encode { + my ($self, $string) = @_; + return $self->{encoding_object}->encode($string); + } + sub decode { + my ($self, $string) = @_; + return eval { # returns undef on decode failure + $self->{encoding_object}->decode($string, Encode::FB_CROAK); + }; + } + + # Create attribute for the given fore-/background colors. + sub color_pair { + my ($self, $fg, $bg) = @_; + + state $next_color_pair = 1; # must start at 1 for init_pair() + + Curses::init_pair($next_color_pair, $fg, $bg); + return Curses::COLOR_PAIR($next_color_pair++); + } + + # Draw a string which must fit in the current line. Wrapping/clipping is + # not supported and must be handled by the caller. + sub draw_simple { + my ($self, $y, $x, $attributes, $string) = @_; + + die if $string =~ /\n/; + # FIXME: wide characters + die if $x + length $string > $self->width; + + $self->{curses}->attron($attributes) if defined $attributes; + $self->{curses}->addstr($y, $x, $self->encode($string)); + $self->{curses}->attroff($attributes) if defined $attributes; + return; + } + # Like draw_simple(), but the string is automatically clipped. + sub draw_clipped { + my ($self, $y, $x, $attributes, $string) = @_; + + # FIXME: wide characters + $string = substr $string, 0, $self->width - $x; + $self->draw_simple($y, $x, $attributes, $string); + return; + } + sub draw { + my ($self, $y, $x, $attributes, $string) = @_; + + die unless defined $string; + + while (1) { + my $offset; + # We must print each line separately. Search for next newline or + # line end, whichever is closer. + if ($string =~ /\n/) { + $offset = $-[0]; + } + # FIXME: wide characters + if ($x + length $string > $self->width) { + my $new_offset = $self->width - $x; + if (not defined $offset or $offset > $new_offset) { + $offset = $new_offset; + } + } + last unless defined $offset; + + # FIXME: wide characters + $self->draw_simple($y, $x, $attributes, substr $string, 0, $offset); + + # Don't draw "\n" itself. + if ("\n" eq substr $string, $offset, 1) { + $offset++; + } + + $string = substr $string, $offset; + + $y++; + $x = 0; + } + + $self->draw_simple($y, $x, $attributes, $string); + return $y; + } + + sub draw_prompt { + my ($self, $config) = @_; + + my $x = 0; + my $y = $self->height - 1; + + # Clear line for better visibility. + $self->draw_simple($y, $x, undef, ' ' x $self->width); + + # Draw prompt flags. + if (defined (my $s = $self->{prompt}{flags})) { + $s = "[$s]"; + $self->draw_clipped($y, $x, $config->{attribute}{prompt_flags}, $s); + $x += length($s) + 1; # space between next element + } + # Draw prompt name. + if (defined (my $s = $self->{prompt}{name})) { + $s = "[$s]"; + $self->draw_clipped($y, $x, $config->{attribute}{prompt_name}, $s); + $x += length($s) + 1; + } + # Draw prompt value, e.g. a search field. + if (defined (my $s = $self->{prompt}{value})) { + $self->draw_clipped($y, $x, undef, $s); + $x += length($s) + 1; + } + return; + } + + sub draw_matches { + my ($self, $config, $matches_remove, $matches_add) = @_; + + foreach (@{$matches_remove}) { + $self->draw($_->{y}, $_->{x}, Curses::A_NORMAL, $_->{string}); + } + + my $attr_id = $config->{attribute}{match_id}; + my $attr_string = $config->{attribute}{match_string}; + + foreach (@{$matches_add}) { + $self->draw($_->{y}, $_->{x}, $attr_string, $_->{string}); + if (defined $_->{id}) { + $self->draw($_->{y}, $_->{x}, $attr_id, $_->{id}); + } + } + return; + } + + sub die { + my ($self, @args) = @_; + + my $attr = $self->color_pair(Curses::COLOR_RED, -1) | Curses::A_BOLD; + + # Clear the screen to improve visibility of the error message. + $self->{curses}->clear; + + my $y = $self->draw(0, 0, $attr, "@args"); + + if ($self->{debug}) { + my $msg; + eval { + require Devel::StackTrace; + }; + if ($@) { + $msg = "Devel::StackTrace missing, no stack trace.\n"; + } else { + my $trace = Devel::StackTrace->new; + $msg = "Stack trace:\n" . $trace->as_string; + } + $y = $self->draw($y + 1, 0, Curses::A_NORMAL, $msg); + } + + $self->draw($y + 1, 0, Curses::A_NORMAL, + 'Press any key to terminate fcscs.'); + $self->refresh; + + $self->getch; + $self->deinit; + exit 1; + } + + + sub prompt { + my ($self, %settings) = @_; + + foreach (keys %settings) { + CORE::die if not exists $self->{prompt}{$_}; + $self->{prompt}{$_} = $settings{$_}; + } + return; + } + + # Wrapper for Curses. + sub width { return $Curses::COLS; } + sub height { return $Curses::LINES; } + sub refresh { return $_[0]->{curses}->refresh; } + sub getch { return $_[0]->{curses}->getch; } + sub cursor { Curses::curs_set($_[1]); return; } +} + + + +# FUNCTIONS + +sub debug { + my ($config, $module, @args) = @_; + + say STDERR "$module: @args" if $config->{setting}{debug}; + return; +} + + +sub prepare_input { + my ($screen, $input_ref) = @_; + + # Make sure the input fits on the screen by removing the top lines if + # necessary. + splice @{$input_ref}, 0, -$screen->height; + + # Pad each line with spaces to the screen width to correctly handle + # multi-line regexes. + # FIXME: wide characters + my @padded = map { sprintf '%-*s', $screen->width, $_ } @{$input_ref}; + + my $string = join "\n", @padded; + return { + string => $string, + lines => $input_ref, + width => $screen->width + 1, + # + 1 = "\n", used in input_match_offset_to_coordinates + }; +} + +sub input_match_offset_to_coordinates { + my ($width, $offset) = @_; + + die unless defined $offset; + + my $y = int($offset / $width); + my $x = $offset - $y * $width; + return ($x, $y); +} + +sub get_regex_matches { + my ($input, $regex) = @_; + + my @matches; + while ($input->{string} =~ /$regex/g) { + my ($x, $y) = input_match_offset_to_coordinates($input->{width}, + $-[0]); + push @matches, { x => $x, y => $y, string => $1 }; + } + return @matches; +} + + +sub run_command { + my ($config, $cmd) = @_; + + debug $config, 'run_command', "running @{$cmd}"; + + my $exit = do { + # Perl's system() combined with a $SIG{__WARN__} which die()s has + # issues due to the fork. The die() in the __WARN__ handler doesn't + # die but the program continues after the system(). + # + # If the forked process fails to exec (e.g. program not found) then + # the __WARN__ handler is called (because a warning is about to be + # displayed) and the die() should display a message and terminate the + # process. But due to the fork it doesn't terminate the parent process + # and instead changes the return value of system(); it's no longer -1 + # which makes it impossible to detect that case. + # + # Perl < 5.18 (found in 5.14) doesn't setup $$ during system() which + # makes it impossible to detect if the handler was called from inside + # the child. + # + # Instead, just ignore any warnings during the system(). Thanks to + # mauke in #perl on Freenode (2013-10-29 23:30 CET) for the idea to + # use no warnings and anno for testing a more recent Perl version with + # a working $$. + no warnings; + + system { $cmd->[0] } @{$cmd}; + }; + if ($exit != 0) { + my $msg; + if ($? == -1) { + $msg = 'failed to execute: ' . $!; + } elsif ($? & 127) { + $msg = 'killed by signal ' . ($? & 127); + } else { + $msg = 'exited with code ' . ($? >> 8); + } + die "system(@{$cmd}) $msg."; + } + return; +} +sub run_in_background { + my ($config, $sub) = @_; + + debug $config, 'run_in_background', "running $sub"; + + my $pid = fork; + defined $pid or die $!; + + if ($pid == 0) { + # The terminal multiplexer sends a SIGHUP to the process when it + # closes the window (because the parent process has exited). + local $SIG{HUP} = 'IGNORE'; + + # Necessary for GNU screen or it'll keep the window open until the + # paste command has run. + close STDIN or die $!; + close STDOUT or die $!; + close STDERR or die $!; + + # Double-fork to prevent zombies. + my $pid = fork; + defined $pid or die $!; + if ($pid == 0) { # child + $sub->(); + } + exit; + } + waitpid $pid, 0 or die $!; + return; +} + + +sub select_match { + my ($name, $screen, $config, $input, $matches) = @_; + + debug $config, 'select_match', 'started'; + + return if @{$matches} == 0; + # Don't return on initial run to give the user a chance to select another + # mode, e.g. to switch from URL selection to search selection. + if (@{$matches} == 1 and not $config->{state}->{initial}) { + return { match => $matches->[0] }; + } + $config->{state}{initial} = 0; + + my @sorted = sort { $b->{y} <=> $a->{y} or $b->{x} <=> $a->{x} } @{$matches}; + + my $i = 1; + foreach (@sorted) { + $_->{id} = $i++; + } + + $screen->prompt(name => $name, value => undef); + $screen->draw_prompt($config); + + $screen->draw_matches($config, [], $matches); + $screen->refresh; + + my $number = 0; + while (1) { + my $char = $screen->getch; + if ($char =~ /^\d$/) { + $number = $number * 10 + $char; + } elsif ($char eq "\b" or $char eq "\x7f") { # backspace + $number = int($number / 10); + } elsif ($char eq "\n") { + if ($number == 0) { # number without selection matches last entry + $number = 1; + } + last; + + # Selecting a new mode requires falling through into the main input + # loop and then starting the new mode. + } elsif (defined $config->{mapping}{mode}{$char}) { + $screen->draw_matches($config, $matches, []); # clear matches + return { key => $char }; + # All other mappings stay in the current mode. + } elsif (defined (my $m = $config->{mapping}{simple}{$char})) { + $m->($char, $screen, $config, $input); + next; + + } else { + next; # ignore unknown mappings + } + + last if $number > 0 and $number * 10 > @{$matches}; # unique match + + my @remaining = $number == 0 + ? @{$matches} + : grep { $_->{id} =~ /^$number/ } @{$matches}; + $screen->draw_matches($config, $matches, \@remaining); + $screen->refresh; + } + + foreach (@{$matches}) { + return { match => $_ } if $_->{id} == $number; + } + debug $config, 'select_match', 'no match selected'; + return { match => undef }; +} + + +sub mapping_paste { + my ($key, $screen, $config, $input) = @_; + + debug $config, 'mapping_paste', 'started'; + + $config->{state}{handler} = \&handler_paste; + + $screen->prompt(flags => 'P'); # paste + $screen->draw_prompt($config); + $screen->refresh; + + return {}; +} +sub mapping_yank { + my ($key, $screen, $config, $input) = @_; + + debug $config, 'mapping_yank', 'started'; + + $config->{state}{handler} = \&handler_yank; + + $screen->prompt(flags => 'Y'); # yank + $screen->draw_prompt($config); + $screen->refresh; + + return {}; +} + + +sub mapping_mode_path { + my ($key, $screen, $config, $input) = @_; + + debug $config, 'mapping_mode_path', 'started'; + + my @matches = get_regex_matches($input, $config->{regex}{path}); + return { + select => 'path select', + matches => \@matches, + handler => \&handler_yank, + }; +} +sub mapping_mode_url { + my ($key, $screen, $config, $input) = @_; + + debug $config, 'mapping_mode_url', 'started'; + + my @matches = get_regex_matches($input, $config->{regex}{url}); + return { + select => 'url select', + matches => \@matches, + handler => \&handler_url, + }; +} + +sub mapping_mode_search { + my ($key, $screen, $config, $input) = @_; + + debug $config, 'mapping_mode_search', 'started'; + + $screen->cursor(1); + + my $search = ''; # encoded + my @last_matches; + while (1) { + # getch doesn't return decoded characters but raw input bytes. Wait + # until the input character is complete. + my $value = $screen->decode($search); + $value = '' unless defined $value; # undef on decode failure + + $screen->prompt(name => 'search', value => $value); + $screen->draw_prompt($config); + $screen->refresh; + + my $char = $screen->getch; + # TODO: readline editing support + if ($char eq "\n") { + last; + } elsif ($char eq "\b" or $char eq "\x7f") { # backspace + # Remove a character, not a byte. + $search = $screen->decode($search); + chop $search; + $search = $screen->encode($search); + } else { + $search .= $char; + next unless defined $screen->decode($search); + } + + my @matches; + if ($search ne '') { + my $case = ''; + if (($config->{setting}{smartcase} and $search eq lc $search) + or $config->{setting}{ignorecase}) { + $case = '(?i)'; + } + # Ignore invalid regexps. + # TODO: display warning on error? + eval { + @matches = get_regex_matches($input, qr/($case$search)/); + }; + } + $screen->draw_matches($config, \@last_matches, \@matches); + @last_matches = @matches; + } + + $screen->cursor(0); + + return { + select => 'search', + matches => \@last_matches, + handler => \&handler_yank, + }; +} + +sub mapping_quit { + my ($key, $screen, $config, $input) = @_; + + # Key is necessary to fall through to main event loop which then quits. + return { key => $key, quit => 1 }; +} + + +sub handler_yank { + my ($screen, $config, $match) = @_; + + debug $config, 'handler_yank', 'started'; + + require File::Temp; + + # Use a temporary file to prevent leaking the yanked data to other users + # with the command line, e.g. ps aux or top. + my ($fh, $tmp) = File::Temp::tempfile(); # dies on its own + print $fh $screen->encode($match->{string}); + close $fh or die $!; + + if ($config->{setting}{multiplexer} eq 'screen') { + debug $config, 'handler_yank', 'using screen'; + + # GNU screen displays an annoying "Slurping X characters into buffer". + # Use 'msgwait 0' as a hack to disable it. + my $msgwait = $config->{setting}{screen_msgwait}; + run_command($config, ['screen', '-X', 'msgwait', 0]); + run_command($config, ['screen', '-X', 'readbuf', $tmp]); + run_command($config, ['screen', '-X', 'msgwait', $msgwait]); + } elsif ($config->{setting}{multiplexer} eq 'tmux') { + debug $config, 'handler_yank', 'using tmux'; + + run_command($config, ['tmux', 'load-buffer', $tmp]); + } else { + die 'unsupported multiplexer'; + } + + unlink $tmp or die $!; + return; +} +sub handler_paste { + my ($screen, $config, $match) = @_; + + debug $config, 'handler_paste', 'started'; + + require Time::HiRes; + + my @cmd; + if ($config->{setting}{multiplexer} eq 'screen') { + debug $config, 'handler_paste', 'using screen'; + @cmd = qw( screen -X paste . ); + } elsif ($config->{setting}{multiplexer} eq 'tmux') { + debug $config, 'handler_paste', 'using tmux'; + @cmd = qw( tmux paste-buffer ); + } else { + die 'unsupported multiplexer'; + } + + run_in_background($config, sub { + # We need to get the data in the paste buffer before we can paste + # it. + handler_yank($screen, $config, $match); + + # Sleep until we switch back to the current window. + Time::HiRes::usleep($config->{setting}{paste_sleep}); + + run_command($config, \@cmd); + }); + return; +} +sub handler_url { + my ($screen, $config, $match) = @_; + + debug $config, 'handler_url', 'started'; + + run_in_background($config, sub { + my $url = defined $match->{url} + ? $match->{url} + : $match->{string}; + + my @cmd = map { $screen->encode($_) } ( + @{$config->{setting}{browser}}, + $url, + ); + run_command($config, \@cmd); + }); + return; +} + + + +# CONFIGURATION DEFAULTS + +=head1 CONFIGURATION + +fcscs is configured through F<~/.fcscsrc> or F<~/.config/fcscs/fcscsrc> which +is a normal Perl script with all of Perl's usual features. + +All configuration values are stored in the hash C<%config>. All manually +defined keys overwrite the default settings. + +A simple F<~/.fcscsrc> could look like this (for details about the used +settings see below): + + use strict; + use warnings; + + use Curses; # for COLOR_* and A_* constants + + our %config; + + # Draw matches in blue. + $config{attribute}{match_string} = color_pair(COLOR_BLUE, -1); + # Enable Vim-like 'smartcase', ignore case until an upper character is + # searched. + $config{setting}{smartcase} = 1; + + # Use chromium to open URLs if running under X, elinks otherwise. + if (defined $ENV{DISPLAY}) { + $config{setting}{browser} = ['chromium']; + } else { + $config{setting}{browser} = ['elinks']; + } + + # Let fcscs know the file was loaded successfully. + 1; + +=cut + + +if (@ARGV != 1) { + require Pod::Usage; + Pod::Usage::pod2usage(2); +} + + +# Determine terminal encoding from the environment ($ENV{LANG} or similar). +my $encoding = I18N::Langinfo::langinfo(I18N::Langinfo::CODESET); + +my $screen = Screen->init($encoding); + +# We must restore the screen before exiting. +local $SIG{INT} = sub { + $screen->deinit; + exit 128 + 2; +}; +# Make all warnings fatal to make sure they don't get lost (stderr is normally +# not displayed). +local $SIG{__WARN__} = sub { + $screen->die('warning', @_); +}; + + + +=head2 MAPPINGS + +I: Mappings are split in two categories: Mode mappings which change the +selection and may receive additional input (e.g. a search string) and simple +mappings which only change some value. Mode mappings are configured via +C<$config{mapping}{mode}>, simple mappings via C<$config{mapping}{simple}>. + +The following mode mappings are available by default (the function to remap +them in parentheses): + +=over + +=item B select absolute/relative paths (C<\&mapping_mode_path>) + +=item B select URLs (C<\&mapping_mode_url>) + +=item B search for regex to get selection (C<\&mapping_mode_search>) + +=item B quit fcscs (C<\&mapping_quit>) + +=back + +The following simple mappings are available by default: + +=over + +=item B

enable pasting (C<\&mapping_paste>) + +=item B enable yanking (copying) (C<\&mapping_yank>) + +=back + +All (single-byte) keys except numbers, backspace and return can be mapped. + +Unknown mappings are ignored when pressing keys. + +To remove a default mapping, delete it from the mapping hash. + +Example: + + # Map 'p' to select paths, 'P' to enable pasting. + $config{mapping}{mode}{p} = \&mapping_mode_path; + $config{mapping}{simple}{P} = \&mapping_paste; + + # Disable 'f' mapping. + delete $config{mapping}{mode}{f}; + +=cut +my %mapping_mode = ( + f => \&mapping_mode_path, + u => \&mapping_mode_url, + '/' => \&mapping_mode_search, + q => \&mapping_quit, +); +my %mapping_simple = ( + p => \&mapping_paste, + y => \&mapping_yank, +); + +=head2 ATTRIBUTES + +Attributes are used to style the output. They must be Curses attributes. +Defaults in parentheses (foreground, background, attribute). + +=over + +=item B attribute for match numbers (red, default, bold) + +=item B attribute for matches (yellow, default, normal) + +=item B attribute for prompt name (standout) + +=item B attribute for prompt flags (standout) + +=back + +Example: + + # Draw prompt flags in bold red with default background color. + $config{attribute}{prompt_flags} + = Curses::A_BOLD + | color_pair(Curses::COLOR_RED, -1); + +=cut +my %attribute = ( + match_id => $screen->color_pair(Curses::COLOR_RED, -1) + | Curses::A_BOLD, + match_string => $screen->color_pair(Curses::COLOR_YELLOW, -1), + prompt_name => Curses::A_STANDOUT, + prompt_flags => Curses::A_STANDOUT, +); + +=head2 SETTINGS + +Defaults in parentheses. + +=over + +=item B enable debug mode (redirect stderr when enabling) (C<0>) + +=item B start in this mode, must be a valid mode mapping (C<\&mapping_mode_url>) + +=item B set multiplexer ("screen" or "tmux") if not autodetected (C) + +=item B ignore case when searching (C<0>) + +=item B ignore case unless one uppercase character is searched (C<1>) + +=item B sleep x us before running paste command (C<100_000>) + +=item B GNU Screen's msgwait variable, used when yanking (C<5>) + +=item B browser command as array reference (C<['x-www-browser']>) + +=back + +Example: + + # Select paths on startup instead of URLs. + $config{setting}{initial_mode} = \&mapping_mode_path; + +=cut +my %setting = ( + # options + debug => 0, + initial_mode => \&mapping_mode_url, + multiplexer => undef, + ignorecase => 0, + smartcase => 1, + paste_sleep => 100_000, + screen_msgwait => 5, + # commands + browser => ['x-www-browser'], +); + +=head2 REGEXPS + +=over + +=item B used by C<\&mapping_mode_url()> + +=item B used by C<\&mapping_mode_path()> + +=back + +Example: + + # Select all non-whitespace characters when searching for paths. + $config{regex}{path} = qr{\S+}; + +=cut +my %regex = ( + # Taken from urlview's default configuration file, thanks. + url => qr{((?:(?:(?:http|https|ftp|gopher)|mailto):(?://)?[^ <>"\t]*|(?:www|ftp)[0-9]?\.[-a-z0-9.]+)[^ .,;\t\n\r<">\):]?[^, <>"\t]*[^ .,;\t\n\r<">\):])}, + path => qr{(~?[a-zA-Z0-9_./-]*/[a-zA-Z0-9_./-]+)}, +); + +my %state = ( + initial => 1, # used by select_match() for 'initial_mode' + handler => undef, +); + + + +# CONFIGURATION "API" + +=head2 FUNCTIONS + +The following functions are available: + + color_pair($fg, $bg) + +Create a new Curses attribute with the given fore- and background color. + + mapping_mode_path() + mapping_mode_url() + mapping_mode_search() + + mapping_paste() + mapping_yank() + mapping_quit() + +Used as mappings, see L above. + + handler_yank() + handler_paste() + handler_url() + +Used as handler to yank, paste selection or open URL in browser. They are +either set by the matching mapping function (C, etc.) or +configured by the current mode. + + get_regex_matches() + select_match() + run_command() + run_in_background() + +Helper functions when writing custom mappings, see the source for details. + +Example: + + TODO + +=cut + +# All variables and functions which are usable by ~/.fcscsrc. +package Fcscs { + our $screen; # "private" + our %config; + + sub color_pair { return $screen->color_pair(@_); } + + sub mapping_mode_path { return main::mapping_mode_path(@_); } + sub mapping_mode_url { return main::mapping_mode_url(@_); } + sub mapping_mode_search { return main::mapping_mode_search(@_); } + + sub mapping_paste { return main::mapping_paste(@_); } + sub mapping_yank { return main::mapping_yank(@_); } + sub mapping_quit { return main::mapping_quit(@_); } + + sub handler_yank { return main::handler_yank(@_); } + sub handler_paste { return main::handler_paste(@_); } + sub handler_url { return main::handler_url(@_); } + + sub get_regex_matches { return main::get_regex_matches(@_); } + sub select_match { return main::select_match(@_); } + + sub run_command { return main::run_command(@_); } + sub run_in_background { return main::run_in_background(@_); } +} +$Fcscs::screen = $screen; + + + +# LOAD USER CONFIG + +# Alias %config and %Fcscs::config. %config is less to type. +our %config; +local *config = \%Fcscs::config; + +$config{mapping}{mode} = \%mapping_mode; +$config{mapping}{simple} = \%mapping_simple; +$config{attribute} = \%attribute; +$config{setting} = \%setting; +$config{regex} = \%regex; +$config{state} = \%state; + +package Fcscs { + my @configs = ("$ENV{HOME}/.fcscsrc", + "$ENV{HOME}/.config/fcscs/fcscsrc"); + foreach my $path (@configs) { + my $decoded = $screen->decode($path); + + # Load configuration file. Checks have a race condition if the home + # directory is writable by an attacker (but then the user is screwed + # anyway). + next unless -e $path; + if (not -O $path) { + $screen->die("Config '$decoded' not owned by current user!"); + } + # Make sure the file is not writable by other users. Doesn't handle + # ACLs and see comment above about race conditions. + my @stat = stat $path or die $!; + my $mode = $stat[2]; + if (($mode & Fcntl::S_IWGRP) or ($mode & Fcntl::S_IWOTH)) { + die "Config '$decoded' must not be writable by other users."; + } + + my $result = do $path; + if (not $result) { + $screen->die("Failed to parse '$decoded': $@") if $@; + $screen->die("Failed to do '$decoded': $!") unless defined $result; + $screen->die("Failed to run '$decoded'."); + } + + last; # success, don't load more files + } +} +$screen->{debug} = $config{setting}{debug}; + + +# MAIN + +eval { + # Auto-detect current multiplexer. + if (not defined $config{setting}{multiplexer}) { + if (defined $ENV{STY} and defined $ENV{TMUX}) { + die 'Found both $STY and $TMUX, set $config{setting}{multiplexer}.'; + } elsif (defined $ENV{STY}) { + $config{setting}{multiplexer} = 'screen'; + } elsif (defined $ENV{TMUX}) { + $config{setting}{multiplexer} = 'tmux'; + } else { + die 'No multiplexer found.'; + } + } + + my $binmode = $encoding; + # GNU screen stores the screen dump for unknown reasons as ISO-8859-1 + # instead of the currently active encoding. + if ($config{setting}{multiplexer} eq 'screen') { + $binmode = 'ISO-8859-1'; + } + + my @input_lines; + open my $fh, '<', $ARGV[0] or die $!; + binmode $fh, ":encoding($binmode)" or die $!; + while (<$fh>) { + chomp; + push @input_lines, $_; + } + close $fh or die $!; + + my $input = prepare_input($screen, \@input_lines); + + # Display original screen content. + my $y = 0; + foreach (@{$input->{lines}}) { + $screen->draw_simple($y++, 0, undef, $_); + } + $screen->refresh; + + + my $mapping = $config{setting}{initial_mode}; + + my $key; + while (1) { + if (not defined $mapping) { + $key = $screen->getch unless defined $key; + debug \%config, 'input', "got key '$key'"; + + $mapping = $config{mapping}{mode}{$key}; + $mapping = $config{mapping}{simple}{$key} unless defined $mapping; + if (not defined $mapping) { # ignore unknown mappings + $key = undef; + next; + } + } + + debug \%config, 'input', 'running mapping'; + my $result = $mapping->($key, $screen, \%config, $input); + $mapping = undef; + +RESULT: + if (defined $result->{quit}) { + debug \%config, 'input', 'quitting'; + last; + } + if (defined $result->{key}) { + $key = $result->{key}; # lookup another mapping + debug \%config, 'input', "processing new key: '$key'"; + next; + } + if (defined $result->{select}) { + debug \%config, 'input', 'selecting match'; + my $tmp = $result; + $result = select_match($result->{select}, + $screen, \%config, $input, + $result->{matches}); + $result->{handler} = $tmp->{handler}; + goto RESULT; # reprocess special entries in result + } + if (defined $result->{match}) { + debug \%config, 'input', 'running handler'; + my $handler = $config{state}{handler}; # set by user + $handler = $result->{handler} unless defined $handler; # set by mapping + $handler = \&handler_yank unless defined $handler; # fallback + $handler->($screen, \%config, $result->{match}); + last; + } + + $key = undef; # get next key from user + } +}; +if ($@) { + $screen->die("$@"); +} + +$screen->deinit; + +__END__ + +=head1 EXIT STATUS + +=over 4 + +=item B<0> + +Success. + +=item B<1> + +An error occurred. + +=item B<2> + +Invalid arguments/options. + +=back + +=head1 AUTHOR + +Simon Ruderich Esimon@ruderich.orgE + +=head1 LICENSE AND COPYRIGHT + +Copyright (C) 2013-2016 by Simon Ruderich + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see Ehttp://www.gnu.org/licenses/E. + +=head1 SEE ALSO + +L, L, L + +=cut -- 2.43.2