[patch] Slightly better resize support in TUI mode

[Balazs Kezes <rlblaster@gmail.com>]

Hi,

Resizing doesn't work when in TUI mode (at least on my computer). I now
present a patch which adds a minimal support to it, although there are lots of
issues with it which won't be handled yet. This makes sure that TUI users can
make their terminal a line bigger or smaller without messing up the whole
screen.

First of all we need to make sure that readline works with correct screen
sizes. When readline is not echoing it doesn't update its internal variables
about the screen size. This is an issue because TUI uses curses functions to
echo a character back so readline is in noecho mode. Here's the patch for that:

Changelog

2010-07-19 Balazs Kezes (rlblaster@gmail.com)

	* terminal.c (rl_resize_terminal): Make sure terminal size is updated
	even when readline is not echoing.

Index: terminal.c
===================================================================
RCS file: /cvs/src/src/readline/terminal.c,v
retrieving revision 1.11
diff -c -p -r1.11 terminal.c
*** terminal.c	13 Nov 2006 09:33:30 -0000	1.11
--- terminal.c	19 Jul 2010 20:11:05 -0000
*************** rl_reset_screen_size ()
*** 347,355 ****
  void
  rl_resize_terminal ()
  {
    if (readline_echoing_p)
      {
-       _rl_get_screen_size (fileno (rl_instream), 1);
        if (CUSTOM_REDISPLAY_FUNC ())
  	rl_forced_update_display ();
        else
--- 347,355 ----
  void
  rl_resize_terminal ()
  {
+   _rl_get_screen_size (fileno (rl_instream), 1);
    if (readline_echoing_p)
      {
        if (CUSTOM_REDISPLAY_FUNC ())
  	rl_forced_update_display ();
        else

This is important to make sure readline works even after a resize in
TUI mode when switched back to normal mode.

The other issue is that in TUI's SIGWINCH handler the resize code is not
called at all. In the resize code you need to call resize_term which is
ncurses function in order to update its internal structures. This was placed
into a #ifdef HAVE_RESIZE_TERM but I have not found any references to that
macro so I removed the it. Also it seems to me that wresize is not called for
the command window so I added a call to it too.

Cheers,
Balazs

2010-07-19 Balazs Kezes (rlblaster@gmail.com)

	* tui/tui-win.c (tui_resize_all): Make sure resize_term is called
	and resize the command window after the dimensions are set.
	(tui_sigwinch_handler): Call resize in the SIGWINCH handler but only
	when in TUI mode.

Index: tui-win.c
===================================================================
RCS file: /cvs/src/src/gdb/tui/tui-win.c,v
retrieving revision 1.47
diff -c -p -r1.47 tui-win.c
*** tui-win.c	17 May 2010 22:21:43 -0000	1.47
--- tui-win.c	19 Jul 2010 20:13:08 -0000
*************** tui_resize_all (void)
*** 669,677 ****
        enum tui_win_type win_type;
        int new_height, split_diff, cmd_split_diff, num_wins_displayed = 2;

- #ifdef HAVE_RESIZE_TERM
        resize_term (screenheight, screenwidth);
! #endif
        /* Turn keypad off while we resize.  */
        if (win_with_focus != TUI_CMD_WIN)
  	keypad (TUI_CMD_WIN->generic.handle, FALSE);
--- 669,676 ----
        enum tui_win_type win_type;
        int new_height, split_diff, cmd_split_diff, num_wins_displayed = 2;

        resize_term (screenheight, screenwidth);
!
        /* Turn keypad off while we resize.  */
        if (win_with_focus != TUI_CMD_WIN)
  	keypad (TUI_CMD_WIN->generic.handle, FALSE);
*************** tui_resize_all (void)
*** 804,809 ****
--- 803,812 ----
  	 window.  */
        if (win_with_focus != TUI_CMD_WIN)
  	keypad (TUI_CMD_WIN->generic.handle, TRUE);
+
+       wresize(TUI_CMD_WIN->generic.handle,
+               TUI_CMD_WIN->generic.height,
+               TUI_CMD_WIN->generic.width);
      }
  }

*************** tui_sigwinch_handler (int signal)
*** 817,822 ****
--- 820,831 ----
    /* Say that a resize was done so that the readline can do it later
       when appropriate.  */
    tui_set_win_resized_to (TRUE);
+
+   if (tui_active)
+     {
+       tui_resize_all ();
+       tui_refresh_all_win ();
+     }
  }
  #endif