Support SIGWINCH

lib/reline/ansi.rb

@@ -106,6 +106,11 @@ class Reline::ANSI
     print "\e[1;1H"
   end
 
+  @@old_winch_handler = nil
+  def self.set_winch_handler(&handler)
+    @@old_winch_handler = Signal.trap('WINCH', &handler)
+  end
+
   def self.prep
     int_handle = Signal.trap('INT', 'IGNORE')
     otio = `stty -g`.chomp
@@ -123,5 +128,6 @@ class Reline::ANSI
     int_handle = Signal.trap('INT', 'IGNORE')
     `stty #{otio}`
     Signal.trap('INT', int_handle)
+    Signal.trap('WINCH', @@old_winch_handler) if @@old_winch_handler
   end
 end

lib/reline/line_editor.rb

@@ -69,6 +69,10 @@ class Reline::LineEditor
       Reline::IOGate.move_cursor_column(0)
       @old_trap.call if @old_trap.respond_to?(:call) # can also be string, ex: "DEFAULT"
     }
+    Reline::IOGate.set_winch_handler do
+      @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
+      @screen_size = Reline::IOGate.get_screen_size
+    end
   end
 
   def finalize