2004-10-28 Will <will@glozer.net>

	* macterm.c: allow user to assign key modifiers to the Mac Option
	key via a 'mac-option-modifier' variable.

2 files changed, 44 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 3b327c24548..8479a0f94ce 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2004-10-28  Will  <will@glozer.net>
+
+        * macterm.c: allow user to assign key modifiers to the Mac Option
+        key via a 'mac-option-modifier' variable.
+
 2004-10-28  Stefan  <monnier@iro.umontreal.ca>
 
         * xselect.c (Vx_lost_selection_functions, Vx_sent_selection_functions):
diff --git a/src/macterm.c b/src/macterm.c
index 3616ac95672..eae892fb7fc 100644
--- a/src/macterm.c
+++ b/src/macterm.c
@@ -228,6 +228,10 @@ extern int errno;
 
 extern int extra_keyboard_modifiers;
 
+/* The keysyms to use for the various modifiers.  */
+
+static Lisp_Object Qalt, Qhyper, Qsuper, Qmodifier_value;
+
 static Lisp_Object Qvendor_specific_keysyms;
 
 #if 0
@@ -6988,6 +6992,9 @@ Lisp_Object Qreverse;
 /* True if using command key as meta key.  */
 Lisp_Object Vmac_command_key_is_meta;
 
+/* Modifier associated with the option key, or nil for normal behavior. */
+Lisp_Object Vmac_option_modifier;
+
 /* True if the ctrl and meta keys should be reversed.  */
 Lisp_Object Vmac_reverse_ctrl_meta;
 
@@ -7069,6 +7076,12 @@ mac_to_emacs_modifiers (EventModifiers mods)
     result |= meta_modifier;
   if (NILP (Vmac_command_key_is_meta) && (mods & macAltKey))
     result |= alt_modifier;
+  if (!NILP (Vmac_option_modifier) && (mods & optionKey)) {
+      Lisp_Object val = Fget(Vmac_option_modifier, Qmodifier_value);
+      if (!NILP(val))
+          result |= XUINT(val);
+  }
+
   return result;
 }
 
@@ -8549,7 +8562,18 @@ XTread_socket (sd, expected, hold_quit)
                     unsigned long some_state = 0;
                     inev.code = KeyTranslate (kchr_ptr, new_keycode,
                                               &some_state) & 0xff;
-                  }
+                  } else if (!NILP(Vmac_option_modifier) && (er.modifiers & optionKey))
+            {
+                /* When using the option key as an emacs modifier, convert
+                   the pressed key code back to one without the Mac option
+                   modifier applied. */
+                int new_modifiers = er.modifiers & ~optionKey;
+                int new_keycode = keycode | new_modifiers;
+                Ptr kchr_ptr = (Ptr) GetScriptManagerVariable (smKCHRCache);
+                unsigned long some_state = 0;
+                inev.code = KeyTranslate (kchr_ptr, new_keycode,
+                                          &some_state) & 0xff;
+            }
                 else
                   inev.code = er.message & charCodeMask;
                 inev.kind = ASCII_KEYSTROKE_EVENT;
@@ -9248,6 +9272,14 @@ syms_of_macterm ()
   x_error_message_string = Qnil;
 #endif
 
+  Qmodifier_value = intern ("modifier-value");
+  Qalt = intern ("alt");
+  Fput (Qalt, Qmodifier_value, make_number (alt_modifier));
+  Qhyper = intern ("hyper");
+  Fput (Qhyper, Qmodifier_value, make_number (hyper_modifier));
+  Qsuper = intern ("super");
+  Fput (Qsuper, Qmodifier_value, make_number (super_modifier));
+
   Fprovide (intern ("mac-carbon"), Qnil);
 
   staticpro (&Qreverse);
@@ -9304,6 +9336,12 @@ to 4.1, set this to nil.  */);
 Otherwise the option key is used.  */);
   Vmac_command_key_is_meta = Qt;
 
+  DEFVAR_LISP ("mac-option-modifier", &Vmac_option_modifier,
+    doc: /* Modifier to use for the Mac alt/option key.  The value can
+be alt, hyper, or super for the respective modifier.  If the value is
+nil then the key will act as the normal Mac option modifier.  */);
+  Vmac_option_modifier = Qnil;
+
   DEFVAR_LISP ("mac-reverse-ctrl-meta", &Vmac_reverse_ctrl_meta,
     doc: /* Non-nil means that the control and meta keys are reversed.  This is
             useful for non-standard keyboard layouts.  */);