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#! perl

=head1 NAME

eval - evaluate arbitrary perl code using actions

=head1 EXAMPLES

  URxvt.keysym.M-c: eval:selection_to_clipboard
  URxvt.keysym.M-v: eval:paste_clipboard
  URxvt.keysym.M-V: eval:paste_primary

  URxvt.keysym.M-Up: eval:scroll_up 1
  URxvt.keysym.M-Down: eval:scroll_down 1
  URxvt.keysym.M-Home: eval:scroll_to_top
  URxvt.keysym.M-End:  eval:scroll_to_bottom

=head1 DESCRIPTION

Add support for evaluating arbitrary perl code using actions in keysym
resources. If a keysym I<action> takes the form C<eval:STRING>, the
specified B<STRING> is evaluated as a Perl expression. While the full
urxvt API is available, the following methods are also provided for
users' convenience, as they implement basic actions:

=cut

our ($self);

=over 4

=item scroll_up $count

=item scroll_up_pages $count

=item scroll_down $count

=item scroll_down_pages $count

Scroll up or down by C<$count> lines or pages.

=cut

sub scroll_up ($) {
    my $lines = $_[0];
    $self->view_start ($self->view_start - $lines);
}

sub scroll_up_pages ($) {
    my $lines = $_[0] * ($self->nrow - 1);
    $self->view_start ($self->view_start - $lines);
}

sub scroll_down ($) {
    my $lines = $_[0];
    $self->view_start ($self->view_start + $lines);
}

sub scroll_down_pages ($) {
    my $lines = $_[0] * ($self->nrow - 1);
    $self->view_start ($self->view_start + $lines);
}

=item scroll_to_top

=item scroll_to_bottom

Scroll to the top or bottom of the scrollback.

=cut

sub scroll_to_top () {
    $self->view_start ($self->top_row);
}

sub scroll_to_bottom () {
    $self->view_start (0);
}

=item selection_to_clipboard

Copy the selection to the CLIPBOARD.

=cut

sub selection_to_clipboard () {
    $self->selection ($self->selection, 1);
    $self->selection_grab (urxvt::CurrentTime, 1);
}

=item paste_primary

=item paste_clipboard

Paste the value of the PRIMARY or CLIPBOARD selection.

=cut

sub paste_primary () {
    $self->selection_request (urxvt::CurrentTime, 1);
}

sub paste_clipboard () {
    $self->selection_request (urxvt::CurrentTime, 3);
}

=back

=cut

sub on_action {
    my ($arg_self, $action) = @_;

    local $self  = $arg_self;
    eval "#line 1 \"$action\"\n$action";
    die $@ if $@;

    ()
}