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#! perl
=head1 NAME
readline - improve readline editing (enabled by default)
=head1 DESCRIPTION
A support package that tries to make editing with readline easier. At
the moment, it reacts to clicking shift-left mouse button by trying to
move the text cursor to this position. It does so by generating as many
cursor-left or cursor-right keypresses as required (this only works
for programs that correctly support wide characters).
To avoid too many false positives, this is only done when:
=over 4
=item - the tty is in ICANON state.
=item - the text cursor is visible.
=item - the primary screen is currently being displayed.
=item - the mouse is on the same (multi-row-) line as the text cursor.
=back
The normal selection mechanism isn't disabled, so quick successive clicks
might interfere with selection creation in harmless ways.
=cut
use POSIX ();
my $termios = new POSIX::Termios;
sub on_init {
my ($self) = @_;
$self->{enabled} = 1;
push @{ $self->{term}{option_popup_hook} }, sub {
("readline" => $self->{enabled}, sub { $self->{enabled} = shift })
};
()
}
sub on_button_press {
my ($self, $event) = @_;
$self->current_screen || $self->hidden_cursor || !$self->{enabled}
and return;
my $mask = $self->ModLevel3Mask | $self->ModMetaMask
| urxvt::ShiftMask | urxvt::ControlMask;
($event->{state} & $mask) == urxvt::ShiftMask
or return;
$termios->getattr ($self->pty_fd)
or return;
$termios->getlflag & &POSIX::ICANON
and return;
my ($row, $col) = $self->screen_cur;
my $line = $self->line ($row);
my $cur = $line->offset_of ($row, $col);
my $ofs = $line->offset_of ($event->{row}, $event->{col});
$ofs >= 0 && $ofs < $line->l
or return;
my $diff = $ofs - $cur;
my $move;
if ($diff < 0) {
($ofs, $cur) = ($cur, $ofs);
$move = "\x1b[D";
} else {
$move = "\x1b[C";
}
my $skipped = substr $line->t, $cur, $ofs - $cur;
$skipped =~ s/\x{ffff}//g;
$self->tt_write ($move x length $skipped);
1
}
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