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#! perl
# this extension implements scrollback buffer search
#:META:RESOURCE:%:string:activation hotkey keysym
=head1 NAME
searchable-scrollback - incremental scrollback search (enabled by default)
=head1 DESCRIPTION
Adds regex search functionality to the scrollback buffer, triggered by
the C<searchable-scrollback:start> action (bound to C<M-s> by
default). While in search mode, normal terminal input/output is
suspended and a regex is displayed at the bottom of the screen.
Inputting characters appends them to the regex and continues incremental
search. In addition, the following bindings are recognized:
=over 4
=item C<BackSpace>
Remove a character from the regex.
=item C<Insert>
Append the value of the PRIMARY selection to the regex.
=item C<Up>
Search for a match upwards.
=item C<Down>
Search for a match downwards.
=item C<Prior>
Scroll up.
=item C<Next>
Scroll down.
=item C<End>
Scroll to the bottom.
=item C<Escape>
Leave the mode and return to the point where search was started.
=item C<Enter> or C<Return>
Leave the mode maintaining the current position in the scrollback.
Additionally, if the C<Shift> modifier is active, store the first
match in the current line into the primary selection.
=back
The regex defaults to "(?i)", resulting in a case-insensitive search. To
get a case-sensitive search you can delete this prefix using C<BackSpace>
or simply use an uppercase character which removes the "(?i)" prefix.
See L<perlre> for more info about perl regular expression syntax.
=cut
sub on_init {
my ($self) = @_;
# only for backwards compatibility
my $hotkey = $self->{argv}[0]
|| $self->x_resource ("%")
|| "M-s";
$self->bind_action ($hotkey, "%:start")
or warn "unable to register '$hotkey' as scrollback search start hotkey\n";
()
}
sub on_user_command {
my ($self, $cmd) = @_;
$cmd eq "searchable-scrollback:start"
and $self->enter;
()
}
sub on_action {
my ($self, $action) = @_;
$action eq "start"
and $self->enter;
()
}
sub msg {
my ($self, $msg) = @_;
$self->{overlay} = $self->overlay (0, -1, $self->ncol, 1, urxvt::OVERLAY_RSTYLE, 0);
$self->{overlay}->set (0, 0, $self->special_encode ($msg));
}
sub enter {
my ($self) = @_;
return if $self->{overlay};
$self->{view_start} = $self->view_start;
$self->{pty_ev_events} = $self->pty_ev_events (urxvt::EV_NONE);
$self->{row} = $self->nrow - 1;
$self->{search} = "(?i)";
$self->enable (
key_press => \&key_press,
tt_write => \&tt_write,
refresh_begin => \&refresh,
refresh_end => \&refresh,
);
$self->{manpage_overlay} = $self->overlay (0, -2, $self->ncol, 1, urxvt::OVERLAY_RSTYLE, 0);
$self->{manpage_overlay}->set (0, 0, "scrollback search, see the ${urxvt::RXVTNAME}perl manpage for details");
$self->idle;
}
sub leave {
my ($self) = @_;
$self->disable ("key_press", "tt_write", "refresh_begin", "refresh_end");
$self->pty_ev_events ($self->{pty_ev_events});
delete $self->{manpage_overlay};
delete $self->{overlay};
delete $self->{search};
delete $self->{found};
}
sub idle {
my ($self) = @_;
$self->msg ("(escape cancels) /$self->{search}█");
}
sub search {
my ($self, $dir, $row) = @_;
my $search = $self->special_encode ($self->{search});
no re 'eval'; # just to be sure
if (my $re = eval { qr/$search/ }) {
while ($self->nrow > $row && $row >= $self->top_row) {
my $line = $self->line ($row)
or last;
my $text = $line->t;
if ($text =~ /$re/g) {
delete $self->{found};
do {
push @{ $self->{found} }, [$line->coord_of ($-[0]), $line->coord_of ($+[0])];
} while $text =~ /$re/g;
$self->{row} = $row;
$self->view_start (List::Util::min 0, $row - ($self->nrow >> 1));
$self->want_refresh;
return;
}
$row = $dir < 0 ? $line->beg - 1 : $line->end + 1;
}
}
$self->scr_bell;
}
sub refresh {
my ($self) = @_;
return unless $self->{found};
my $xor = urxvt::RS_RVid | urxvt::RS_Blink;
for (@{ $self->{found} }) {
$self->scr_xor_span (@$_, $xor);
$xor = urxvt::RS_RVid;
}
()
}
sub key_press {
my ($self, $event, $keysym, $string) = @_;
delete $self->{manpage_overlay};
if ($keysym == 0xff0d || $keysym == 0xff8d) { # enter
if ($self->{found} && $event->{state} & urxvt::ShiftMask) {
my ($br, $bc, $er, $ec) = @{ $self->{found}[0] };
$self->selection_beg ($br, $bc);
$self->selection_end ($er, $ec);
$self->selection_make ($event->{time});
}
$self->leave;
} elsif ($keysym == 0xff1b) { # escape
$self->view_start ($self->{view_start});
$self->leave;
} elsif ($keysym == 0xff57) { # end
$self->{row} = $self->nrow - 1;
$self->view_start (0);
} elsif ($keysym == 0xff52) { # up
my $line = $self->line ($self->{row});
$self->search (-1, $line->beg - 1)
if $line->beg > $self->top_row;
} elsif ($keysym == 0xff54) { # down
my $line = $self->line ($self->{row});
$self->search (+1, $line->end + 1)
if $line->end < $self->nrow;
} elsif ($keysym == 0xff55) { # prior
my $row = $self->view_start - ($self->nrow - 1);
$self->view_start (List::Util::min 0, $row);
} elsif ($keysym == 0xff56) { # next
my $row = $self->view_start + ($self->nrow - 1);
$self->view_start (List::Util::min 0, $row);
} elsif ($keysym == 0xff63) { # insert
$self->selection_request (urxvt::CurrentTime, 1);
} elsif ($keysym == 0xff08) { # backspace
substr $self->{search}, -1, 1, "";
$self->search (+1, $self->{row});
$self->idle;
} elsif ($string !~ /[\x00-\x1f\x80-\xaf]/) {
return; # pass to tt_write
}
1
}
sub tt_write {
my ($self, $data) = @_;
$self->{search} .= $self->locale_decode ($data);
$self->{search} =~ s/^\(\?i\)//
if $self->{search} =~ /^\(.*[[:upper:]]/;
delete $self->{found};
$self->search (-1, $self->{row});
$self->idle;
1
}
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