Commit ecb7cb34 authored by Karl Heuer's avatar Karl Heuer
Browse files

(Vhelp_event_list): New var.

(syms_of_keyboard): Set up Lisp var.
(help_char_p): New function.
(read_char, echo_char, read_key_sequence): Use help_char_p.
parent 18afd477
......@@ -148,6 +148,9 @@ int immediate_quit;
/* Character to recognize as the help char. */
Lisp_Object Vhelp_char;
/* List of other event types to recognize as meaning "help". */
Lisp_Object Vhelp_event_list;
/* Form to execute when help char is typed. */
Lisp_Object Vhelp_form;
......@@ -563,7 +566,7 @@ echo_char (c)
if (current_kboard->echoptr == current_kboard->echobuf
&& EQ (c, Vhelp_char))
&& help_char_p (c))
strcpy (ptr, " (Type ? for further options)");
ptr += strlen (ptr);
......@@ -2050,7 +2053,7 @@ read_char (commandflag, nmaps, maps, prev_event, used_mouse_menu)
/* Process the help character specially if enabled */
if (EQ (c, Vhelp_char) && !NILP (Vhelp_form))
if (!NILP (Vhelp_form) && help_char_p (c))
Lisp_Object tem0;
count = specpdl_ptr - specpdl;
......@@ -2082,6 +2085,22 @@ read_char (commandflag, nmaps, maps, prev_event, used_mouse_menu)
return c;
/* Return 1 if should recognize C as "the help character". */
help_char_p (c)
Lisp_Object c;
Lisp_Object tail;
if (EQ (c, Vhelp_char))
return 1;
for (tail = Vhelp_event_list; CONSP (tail); tail = XCONS (tail)->cdr)
if (EQ (c, XCONS (tail)->car))
return 1;
return 0;
/* Record the input event C in various ways. */
static void
......@@ -5444,7 +5463,7 @@ read_key_sequence (keybuf, bufsize, prompt, dont_downcase_last,
Lisp_Object head;
head = EVENT_HEAD (key);
if (EQ (head, Vhelp_char))
if (help_char_p (head))
read_key_sequence_cmd = Vprefix_help_command;
keybuf[t++] = key;
......@@ -6965,6 +6984,11 @@ When it is read, do `(eval help-form)', and display result if it's a string.\n\
If the value of `help-form' is nil, this char can be read normally.");
XSETINT (Vhelp_char, Ctl ('H'));
DEFVAR_LISP ("help-event-list", &Vhelp_event_list,
"List of input events to recognize as meaning Help.\n\
These work just like the value of `help-char' (see that).");
Vhelp_event_list = Qnil;
DEFVAR_LISP ("help-form", &Vhelp_form,
"Form to execute when character `help-char' is read.\n\
If the form returns a string, that string is displayed.\n\
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