Set add-log-current-defun-function (clojure-emacs#629)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Changes
+
+* [#629](https://github.com/clojure-emacs/clojure-mode/pull/629): Set `add-log-current-defun-function` to new function `clojure-current-defun-name` (this is used by which-function-mode and easy-kill).
+
 ### Bugs fixed
 
 * [#581](https://github.com/clojure-emacs/clojure-mode/issues/581): Fix font locking not working for keywords starting with a number

clojure-mode.el

@@ -524,6 +524,37 @@ replacement for `cljr-expand-let`."
                  #'clojure-space-for-delimiter-p)
     (advice-add 'paredit-convolute-sexp :after #'clojure--replace-let-bindings-and-indent)))
 
+(defun clojure-current-defun-name ()
+  "Return the name of the defun at point, or nil.
+
+`add-log-current-defun-function' is set to this, for use by `which-func'."
+  (save-excursion
+    (let ((location (point)))
+      ;; If we are now precisely at the beginning of a defun, make sure
+      ;; beginning-of-defun finds that one rather than the previous one.
+      (or (eobp) (forward-char 1))
+      (beginning-of-defun)
+      ;; Make sure we are really inside the defun found, not after it.
+      (when (and (looking-at "\\s(")
+		 (progn (end-of-defun)
+			(< location (point)))
+		 (progn (forward-sexp -1)
+			(>= location (point))))
+	(if (looking-at "\\s(")
+	    (forward-char 1))
+	;; Skip the defining construct name, e.g. "defn" or "def".
+	(forward-sexp 1)
+	;; The second element is usually a symbol being defined.  If it
+	;; is not, use the first symbol in it.
+	(skip-chars-forward " \t\n'(")
+        ;; Skip metadata
+        (while (looking-at "\\^")
+          (forward-sexp 1)
+          (skip-chars-forward " \t\n'("))
+	(buffer-substring-no-properties (point)
+					(progn (forward-sexp 1)
+					       (point)))))))
+
 (defun clojure-mode-variables ()
   "Set up initial buffer-local variables for Clojure mode."
   (add-to-list 'imenu-generic-expression '(nil clojure-match-next-def 0))
@@ -552,6 +583,7 @@ replacement for `cljr-expand-let`."
   (setq-local parse-sexp-ignore-comments t)
   (setq-local prettify-symbols-alist clojure--prettify-symbols-alist)
   (setq-local open-paren-in-column-0-is-defun-start nil)
+  (setq-local add-log-current-defun-function #'clojure-current-defun-name)
   (setq-local beginning-of-defun-function #'clojure-beginning-of-defun-function))
 
 (defsubst clojure-in-docstring-p ()