(Qfunction_documentation): New variable.

(syms_of_doc): Initialize Qfunction_documentation.
(Fdocumentation): If FUNCTION is a symbol with non-nil
`function-documentation' property, return a documentation derived
from that.

diff --git a/src/doc.c b/src/doc.c
index 7f3cea1a2db58ba761e488a488fa6e2092497050..e8751902c11fc3439c974e611d2cfba0a8c95847 100644 (file)
--- a/src/doc.c
+++ b/src/doc.c
@@ -43,6 +43,8 @@ Boston, MA 02111-1307, USA.  */
 
 Lisp_Object Vdoc_file_name, Vhelp_manyarg_func_alist;
 
+Lisp_Object Qfunction_documentation;
+
 extern char *index ();
 
 extern Lisp_Object Voverriding_local_map;
@@ -309,12 +311,17 @@ string is passed through `substitute-command-keys'.")
   Lisp_Object funcar;
   Lisp_Object tem, doc;
 
+  if (SYMBOLP (function)
+      && (tem = Fget (function, Qfunction_documentation),
+         !NILP (tem)))
+    return Fdocumentation_property (function, Qfunction_documentation, raw);
+  
   fun = Findirect_function (function);
-
   if (SUBRP (fun))
     {
-      if (XSUBR (fun)->doc == 0) return Qnil;
-      if ((EMACS_INT) XSUBR (fun)->doc >= 0)
+      if (XSUBR (fun)->doc == 0)
+       return Qnil;
+      else if ((EMACS_INT) XSUBR (fun)->doc >= 0)
        doc = build_string (XSUBR (fun)->doc);
       else
        doc = get_doc_string (make_number (- (EMACS_INT) XSUBR (fun)->doc),
@@ -787,6 +794,9 @@ thus, \\=\\=\\=\\= puts \\=\\= into the output, and \\=\\=\\=\\[ puts \\=\\[ int
 void
 syms_of_doc ()
 {
+  Qfunction_documentation = intern ("function-documentation");
+  staticpro (&Qfunction_documentation);
+  
   DEFVAR_LISP ("internal-doc-file-name", &Vdoc_file_name,
     "Name of file containing documentation strings of built-in symbols.");
   Vdoc_file_name = Qnil;