Enhancement - More keysyms on MacOSX/Aqua

[Benjamin Riefenstahl]

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On MacOSX/Aqua, I was missing the ability to bind <s-escape>.  The
reason was that the escape key sends the ASCII ESC instead of the
keysym <escape>, and ASCII keys can not be combined with the shift key
(there is an exception for SPC in src/keyboard.c, make_lispy_event()).

The attached patch adds generation of keysyms for <tab>, <backspace>
and <escape>.  The current keysym converter does not allow to encode
<space> (and space already has a special exception anyway), so I left
that alone.

I also added some entries in function-key-map for these keys, copied
from the X11 and MS Windows files.  Is there a reason why these
mappings are not in a platform-independent file?  They are not used on
a character terminal but they don't pose a problem there either.  OTOH
they are currently maintained in three separate places for the GUI
systems.

Thirdly I cleaned up the table keycode_to_xkeysym_table a bit and
added more comments.  I can send a patch without that change if you
prefer that.

Finally it would be possible to extend the mentioned SPC exception to
other ASCII special keys, which would achive a similar effect.  That
would probably mean more capabilities on character terminals, so it
may be desirable anyway.

ChangeLog:

2002-12-15  Benjamin Riefenstahl  <address@hidden>

        * src/macterm.c (keycode_to_xkeysym_table): Add <tab>,
        <backspace>, <escape>.
        (keycode_to_xkeysym_table): Reformat and add more comments.
        (XTread_socket): Drop special case for backspace. 

        * lisp/term/mac-win.el: Add entries in function-key-map for
        [tab], [backspace], [escape].

emacs.keysym.diff
Description: Text Data

In GNU Emacs 21.3.50.7 (powerpc-apple-darwin6.2)
 of 2002-12-13 on octavian.benny.turtle-trading.net
configured using `configure '--with-carbon' '--without-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Recent input:
<return> <up> <up> <down> <down> <down> <down> <up> 
<up> <down> <down> <up> <up> <down-mouse-1> <mouse-movement> 
<mouse-1> <down> <down> <up> <up> <down> <up> <up> 
<up> <up> <down> <down> <S-escape> <down> <C-kp-end> 
<up> <return> <kp-next> <kp-next> <kp-prior> <kp-prior> 
<S-escape> <C-kp-end> <C-kp-home> <down> <down> <return> 
<C-kp-home> C-h i t d m e m a c s <return> s b u <backspace> 
<backspace> r e p o r t <return> <kp-home> <right> 
<right> <return> <kp-next> <down> <return> <kp-next> 
<kp-next> <kp-prior> <kp-next> <kp-next> <kp-next> 
<kp-next> <kp-next> <kp-next> <kp-next> <kp-next> <kp-next> 
<kp-next> <kp-next> <kp-next> <kp-next> <C-kp-home> 
C-x o M-x <up> <return>

Recent messages:
Sending...done
line-move: Beginning of buffer [2 times]
Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %; q to quit; ? for help.
Mark set
Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %; q to quit; ? for help.
Mark set [3 times]
Composing main Info directory...
Mark set
Composing main Info directory...done
Mark set