(help-function-cmacro): New button.

1 files changed, 16 insertions, 0 deletions

diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 91fb4f99257..7c032b81cf2 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -202,6 +202,22 @@ The format is (FUNCTION ARGS...).")
                        (message "Unable to find location in file"))))
   'help-echo (purecopy "mouse-2, RET: find function's definition"))
 
+(define-button-type 'help-function-cmacro
+  :supertype 'help-xref
+  'help-function (lambda (fun file)
+                   (setq file (locate-library file t))
+                   (if (and file (file-readable-p file))
+                       (progn
+                         (pop-to-buffer (find-file-noselect file))
+                         (goto-char (point-min))
+                         (if (re-search-forward
+                              (format "^[ \t]*(define-compiler-macro[ \t]+%s"
+                                      (regexp-quote (symbol-name fun))) nil t)
+                             (forward-line 0)
+                           (message "Unable to find location in file")))
+                     (message "Unable to find file")))
+  'help-echo (purecopy "mouse-2, RET: find function's compiler macro"))
+
 (define-button-type 'help-variable-def
   :supertype 'help-xref
   'help-function (lambda (var &optional file)