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+A modeline for URxvt.
+
+* Usage
+
+  Download and put it in your ~perl-lib~ (or change your ~perl-lib~ to
+  contain it), add ~modeline~ to your ~perl-ext-common~, and set the
+  ~URxvt.modeline.command~ setting to a shell-executable which produces
+  a single line of output which will be shown in the last line of the
+  terminal.
diff --git a/modeline b/modeline
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+#! perl
+
+#:META:X_RESOURCE:modeline-fg:colour:tab bar foreground colour
+#:META:X_RESOURCE:modeline-bg:colour:tab bar background colour
+#:META:X_RESOURCE:tab-fg:colour:tab foreground colour
+#:META:X_RESOURCE:tab-bg:colour:tab background colour
+#:META:X_RESOURCE:command:string:command
+
+=head1 NAME
+
+modeline - modeline interface to urxvt
+
+=head1 DESCRIPTION
+
+This transforms the terminal into a tabbar with additional terminals, that
+is, it implements what is commonly referred to as "modeline terminal". The topmost line
+displays a "[NEW]" button, which, when clicked, will add a new tab, followed by one
+button per tab.
+
+Clicking a button will activate that tab. Pressing B<Shift-Left> and
+B<Shift-Right> will switch to the tab left or right of the current one,
+while B<Shift-Down> creates a new tab. Pressing B<Ctrl-Left> and
+B<Ctrl-Right> will renumber the current tab by moving it to the left or
+to the right.
+
+The tabbar itself can be configured similarly to a normal terminal, but
+with a resource class of C<URxvt.modeline>. In addition, it supports the
+following four resources (shown with defaults):
+
+   URxvt.modeline.tabbar-fg: <colour-index, default 3>
+   URxvt.modeline.tabbar-bg: <colour-index, default 0>
+   URxvt.modeline.tab-fg:    <colour-index, default 0>
+   URxvt.modeline.tab-bg:    <colour-index, default 1>
+
+See I<COLOR AND GRAPHICS> in the @@RXVT_NAME@@(1) manpage for valid
+indices.
+
+=cut
+
+sub refresh {
+   my ($self) = @_;
+
+   my $ncol = $self->ncol;
+
+   my $text = " " x $ncol;
+   my $rend = [($self->{rs_tabbar}) x $ncol];
+
+   my $output = `$self->{command}`;
+   substr $text, 0, length $output, $output;
+
+   my $idx = 0;
+
+   $self->ROW_t ($self->nrow - 1, $text, 0, 0, $ncol);
+   $self->ROW_r ($self->nrow - 1, $rend, 0, 0, $ncol);
+
+   $self->want_refresh;
+}
+
+sub new_tab {
+   my ($self, @argv) = @_;
+
+   # save a backlink to us, make sure modeline is inactive
+   push @urxvt::TERM_INIT, sub {
+      my ($term) = @_;
+      $term->{parent} = $self;
+
+      for (0 .. urxvt::NUM_RESOURCES - 1) {
+         my $value = $self->{resource}[$_];
+
+         $term->resource ("+$_" => $value)
+            if defined $value;
+      }
+
+      $term->resource (perl_ext_2 => $term->resource ("perl_ext_2") . ",-modeline");
+   };
+
+   push @urxvt::TERM_EXT, urxvt::ext::modeline::tab::;
+
+   my $term = new urxvt::term
+      $self->env, $urxvt::RXVTNAME,
+      -embed => $self->parent,
+      @argv,
+   ;
+}
+
+sub configure {
+   my ($self) = @_;
+
+   my $tab = $self->{cur};
+
+   # this is an extremely dirty way to force a configurenotify, but who cares
+   $tab->XMoveResizeWindow (
+      $tab->parent, 0, 0,
+      $self->width, $self->height - $self->{tabheight}
+   );
+   $tab->XMoveResizeWindow (
+      $tab->parent, 0, 0,
+      $self->width, $self->height - $self->{tabheight}
+   );
+}
+
+sub on_resize_all_windows {
+   my ($self, $width, $height) = @_;
+
+   1
+}
+
+sub copy_properties {
+   my ($self) = @_;
+   my $tab = $self->{cur};
+
+   my $wm_normal_hints = $self->XInternAtom ("WM_NORMAL_HINTS");
+
+   my $current = delete $self->{current_properties};
+
+   # pass 1: copy over properties different or nonexisting
+   for my $atom ($tab->XListProperties ($tab->parent)) {
+      my ($type, $format, $items) = $self->XGetWindowProperty ($tab->parent, $atom);
+
+      # fix up size hints
+      if ($atom == $wm_normal_hints) {
+         my (@hints) = unpack "l!*", $items;
+
+         $hints[$_] += $self->{tabheight} for (4, 6, 16);
+
+         $items = pack "l!*", @hints;
+      }
+
+      my $cur = delete $current->{$atom};
+
+      # update if changed, we assume empty items and zero type and format will not happen
+      $self->XChangeProperty ($self->parent, $atom, $type, $format, $items)
+         if $cur->[0] != $type or $cur->[1] != $format or $cur->[2] ne $items;
+
+      $self->{current_properties}{$atom} = [$type, $format, $items];
+   }
+
+   # pass 2, delete all extraneous properties
+   $self->XDeleteProperty ($self->parent, $_) for keys %$current;
+}
+
+sub make_current {
+   my ($self, $tab) = @_;
+
+   if (my $cur = $self->{cur}) {
+      delete $cur->{activity};
+      $cur->XUnmapWindow ($cur->parent) if $cur->mapped;
+      $cur->focus_out;
+   }
+
+   $self->{cur} = $tab;
+
+   $self->configure;
+   $self->copy_properties;
+
+   $tab->focus_out; # just in case, should be a nop
+   $tab->focus_in if $self->focus;
+
+   $tab->XMapWindow ($tab->parent);
+   delete $tab->{activity};
+   $self->refresh;
+
+   ()
+}
+
+sub on_focus_in {
+   my ($self, $event) = @_;
+
+   $self->{cur}->focus_in;
+   $self->refresh;
+
+   ()
+}
+
+sub on_focus_out {
+   my ($self, $event) = @_;
+
+   $self->{cur}->focus_out;
+   $self->refresh;
+
+   ()
+}
+
+sub on_tt_write {
+    my ($self, $octets) = @_;
+
+    $self->{cur}->tt_write ($octets);
+
+    1
+}
+
+sub on_key_press {
+   my ($self, $event) = @_;
+
+   $self->{cur}->key_press ($event->{state}, $event->{keycode}, $event->{time});
+
+   1
+}
+
+sub on_key_release {
+   my ($self, $event) = @_;
+
+   $self->{cur}->key_release ($event->{state}, $event->{keycode}, $event->{time});
+
+   1
+}
+
+sub on_button_press {
+   1
+}
+
+sub on_button_release {
+   my ($self, $event) = @_;
+
+   if ($event->{row} == 0) {
+      for my $button (@{ $self->{tabofs} }) {
+         $button->[2]->($self, $event)
+            if $event->{col} >= $button->[0]
+               && $event->{col} < $button->[1];
+      }
+   }
+
+   1
+}
+
+sub on_motion_notify {
+   1
+}
+
+sub on_init {
+   my ($self) = @_;
+
+   $self->{resource} = [map $self->resource ("+$_"), 0 .. urxvt::NUM_RESOURCES - 1];
+
+   $self->resource (int_bwidth => 0);
+   $self->resource (name => "URxvt.modeline");
+   $self->resource (pty_fd => -1);
+
+   $self->option ($urxvt::OPTION{scrollBar}, 0);
+
+   my $fg    = $self->x_resource ("fg");
+   my $bg    = $self->x_resource ("bg");
+   my $tabfg = $self->x_resource ("tab-fg");
+   my $tabbg = $self->x_resource ("tab-bg");
+   $self->{command} = $self->x_resource ("command");
+
+   defined $fg    or $fg    = 3;
+   defined $bg    or $bg    = 0;
+   defined $tabfg or $tabfg = 0;
+   defined $tabbg or $tabbg = 1;
+
+   $self->{rs_tabbar} = urxvt::SET_COLOR (urxvt::DEFAULT_RSTYLE, $fg    + 2, $bg    + 2);
+   $self->{rs_tab}    = urxvt::SET_COLOR (urxvt::DEFAULT_RSTYLE, $tabfg + 2, $tabbg + 2);
+
+   ()
+}
+
+sub on_start {
+   my ($self) = @_;
+
+   $self->{tabheight} = $self->int_bwidth + $self->fheight + $self->lineSpace;
+
+   $self->cmd_parse ("\033[?25l");
+
+   my @argv = $self->argv;
+
+   do {
+      shift @argv;
+   } while @argv && $argv[0] ne "-e";
+
+   $self->{overlay} = $self->overlay (-1, 0, 8, 1, urxvt::OVERLAY_RSTYLE, 0);
+   $self->{timer} = urxvt::timer
+                    ->new
+                    ->start (1 + int urxvt::NOW) # make sure we update "on" the second
+                    ->interval (60)
+                    ->cb (sub {
+                        $self->refresh;
+                    });
+
+   $self->new_tab (@argv);
+
+   ()
+}
+
+sub on_configure_notify {
+   my ($self, $event) = @_;
+
+   $self->configure;
+   $self->refresh;
+
+   ()
+}
+
+sub on_wm_delete_window {
+   my ($self) = @_;
+
+   $_->destroy for @{ $self->{tabs} };
+
+   1
+}
+
+sub tab_start {
+   my ($self, $tab) = @_;
+
+   $tab->XChangeInput ($tab->parent, urxvt::PropertyChangeMask);
+
+   push @{ $self->{tabs} }, $tab;
+
+#   $tab->{name} ||= scalar @{ $self->{tabs} };
+   $self->make_current ($tab);
+
+   ()
+}
+
+sub tab_destroy {
+   my ($self, $tab) = @_;
+
+   $self->{tabs} = [ grep $_ != $tab, @{ $self->{tabs} } ];
+
+   if (@{ $self->{tabs} }) {
+      if ($self->{cur} == $tab) {
+         delete $self->{cur};
+         $self->make_current ($self->{tabs}[-1]);
+      } else {
+         $self->refresh;
+      }
+   } else {
+      # delay destruction a tiny bit
+      $self->{destroy} = urxvt::iw->new->start->cb (sub { $self->destroy });
+   }
+
+   ()
+}
+
+sub tab_key_press {
+   my ($self, $tab, $event, $keysym, $str) = @_;
+
+   if ($event->{state} & urxvt::ShiftMask) {
+      if ($keysym == 0xff51 || $keysym == 0xff53) {
+         my ($idx) = grep $self->{tabs}[$_] == $tab, 0 .. $#{ $self->{tabs} };
+
+         --$idx if $keysym == 0xff51;
+         ++$idx if $keysym == 0xff53;
+
+         $self->make_current ($self->{tabs}[$idx % @{ $self->{tabs}}]);
+
+         return 1;
+      } elsif ($keysym == 0xff54) {
+         $self->new_tab;
+
+         return 1;
+      }
+   }
+   elsif ($event->{state} & urxvt::ControlMask) {
+      if ($keysym == 0xff51 || $keysym == 0xff53) {
+         my ($idx1) = grep $self->{tabs}[$_] == $tab, 0 .. $#{ $self->{tabs} };
+         my  $idx2  = ($idx1 + ($keysym == 0xff51 ? -1 : +1)) % @{ $self->{tabs} };
+
+         ($self->{tabs}[$idx1], $self->{tabs}[$idx2]) =
+            ($self->{tabs}[$idx2], $self->{tabs}[$idx1]);
+
+         $self->make_current ($self->{tabs}[$idx2]);
+
+         return 1;
+      }
+   }
+
+   ()
+}
+
+sub tab_property_notify {
+   my ($self, $tab, $event) = @_;
+
+   $self->copy_properties
+      if $event->{window} == $tab->parent;
+
+   ()
+}
+
+sub tab_activity {
+   my ($self, $tab) = @_;
+
+   $self->refresh;
+}
+
+package urxvt::ext::modeline::tab;
+
+# helper extension implementing the subwindows of a modeline terminal.
+# simply proxies all interesting calls back to the modeline class.
+
+{
+    for my $hook (qw(start destroy key_press property_notify)) {
+        eval qq{
+         sub on_$hook {
+             my \$parent = \$_[0]{term}{parent}
+             or return;
+             \$parent->tab_$hook (\@_)
+         }
+      };
+      die if $@;
+   }
+}
+
+sub on_add_lines {
+  $_[0]->{activity}++
+     or $_[0]{term}{parent}->tab_activity ($_[0]);
+  ()
+}