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(Vsuggest_key_bindings): New variable.

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(syms_of_keyboard): Set up Lisp variable.
(Fexecute_extended_command): When enabled, show an equivalent key binding.
This commit is contained in:
Richard M. Stallman 1995-10-03 09:17:37 +00:00
parent 68db017386
commit 6526ab49f0
1 changed files with 79 additions and 0 deletions
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79
src/keyboard.c
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@ -172,6 +172,12 @@ Lisp_Object Vprefix_help_command;
/* List of items that should move to the end of the menu bar. */
Lisp_Object Vmenu_bar_final_items;
/* Non-nil means show the equivalent key-binding for
any M-x command that has one.
The value can be a length of time to show the message for.
If the value is non-nil and not a number, we wait 2 seconds. */
Lisp_Object Vsuggest_key_bindings;
/* Character that causes a quit. Normally C-g.
If we are running on an ordinary terminal, this must be an ordinary
@ -6367,8 +6373,75 @@ DEFUN ("execute-extended-command", Fexecute_extended_command, Sexecute_extended_
current_kboard->Vprefix_arg = prefixarg;
this_command = function;
/* If enabled, show which key runs this command. */
if (!NILP (Vsuggest_key_bindings)
&& SYMBOLP (function))
{
Lisp_Object *maps, bindings;
int nmaps, i;
bindings = Qnil;
nmaps = current_active_maps (&maps);
for (i = 0; i < nmaps && NILP (bindings); i++)
bindings = Fwhere_is_internal (function, maps[i], Qt, Qnil);
free (maps);
if (!NILP (bindings))
{
message ("You can run the command `%s' by typing %s",
XSYMBOL (function)->name->data,
XSTRING (Fkey_description (bindings))->data);
Fsit_for ((NUMBERP (Vsuggest_key_bindings)
? Vsuggest_key_bindings : make_number (2)),
Qnil, Qnil);
}
}
return Fcommand_execute (function, Qt);
}
/* Find the set of keymaps now active.
Store into *MAPS_P a vector holding the various maps
and return the number of them. The vector was malloc'd
and the caller should free it. */
int
current_active_maps (maps_p)
Lisp_Object **maps_p;
{
Lisp_Object *tmaps, *maps;
int nmaps;
/* Should overriding-terminal-local-map and overriding-local-map apply? */
if (!NILP (Voverriding_local_map_menu_flag))
{
/* Yes, use them (if non-nil) as well as the global map. */
maps = (Lisp_Object *) xmalloc (3 * sizeof (maps[0]));
nmaps = 0;
if (!NILP (current_kboard->Voverriding_terminal_local_map))
maps[nmaps++] = current_kboard->Voverriding_terminal_local_map;
if (!NILP (Voverriding_local_map))
maps[nmaps++] = Voverriding_local_map;
}
else
{
/* No, so use major and minor mode keymaps. */
nmaps = current_minor_maps (NULL, &tmaps);
maps = (Lisp_Object *) xmalloc ((nmaps + 2) * sizeof (maps[0]));
bcopy (tmaps, maps, nmaps * sizeof (maps[0]));
#ifdef USE_TEXT_PROPERTIES
maps[nmaps++] = get_local_map (PT, current_buffer);
#else
maps[nmaps++] = current_buffer->keymap;
#endif
}
maps[nmaps++] = current_global_map;
*maps_p = maps;
return nmaps;
}
detect_input_pending ()
@ -7407,6 +7480,12 @@ The precise format isn't relevant here; we just check whether it is nil.");
This function is called with no arguments after each command\n\
whenever `deferred-action-list' is non-nil.");
Vdeferred_action_function = Qnil;
DEFVAR_LISP ("suggest-key-bindings", &Vsuggest_key_bindings,
"Non-nil means show the equivalent key-binding when M-x command has one.\n\
The value can be a length of time to show the message for.\n\
If the value is non-nil and not a number, we wait 2 seconds.");
Vsuggest_key_bindings = Qt;
}
keys_of_keyboard ()