* lisp/progmodes/sh-script.el: Implement `sh-mode' own

`add-log-current-defun-function'.
(sh-current-defun-name): New function.
(sh-mode): Use the function.

Fixes: debbugs:14112

lisp/ChangeLog

@@ -1,3 +1,10 @@
+2013-04-10  Masatake YAMATO  <yamato@redhat.com>
+
+	* progmodes/sh-script.el: Implement `sh-mode' own
+	`add-log-current-defun-function' (bug#14112).
+	(sh-current-defun-name): New function.
+	(sh-mode): Use the function.
+
 2013-04-09  Bastien Guerry  <bzg@gnu.org>
 
 	* simple.el (choose-completion-string): Fix docstring (bug#14163).

lisp/progmodes/sh-script.el

@@ -353,6 +353,28 @@ See `sh-feature' and `imenu-generic-expression'."
   :group 'sh-script
   :version "20.4")
 
+(defun sh-current-defun-name ()
+  "Find the name of function or variable at point.
+For use in `add-log-current-defun-function'."
+  (save-excursion
+    (end-of-line)
+    (when (re-search-backward
+	   (concat "\\(?:"
+		   ;; function FOO
+		   ;; function FOO()
+		   "^\\s-*function\\s-+\\\([[:alpha:]_][[:alnum:]_]*\\)\\s-*\\(?:()\\)?"
+		   "\\)\\|\\(?:"
+		   ;; FOO()
+		   "^\\s-*\\([[:alpha:]_][[:alnum:]_]*\\)\\s-*()"
+		   "\\)\\|\\(?:"
+		   ;; FOO=
+		   "^\\([[:alpha:]_][[:alnum:]_]*\\)="
+		   "\\)")
+	   nil t)
+      (or (match-string-no-properties 1)
+	  (match-string-no-properties 2)
+	  (match-string-no-properties 3)))))
+
 (defvar sh-shell-variables nil
   "Alist of shell variable names that should be included in completion.
 These are used for completion in addition to all the variables named
@@ -1533,6 +1555,7 @@ with your script for an edit-interpret-debug cycle."
   (setq-local skeleton-newline-indent-rigidly t)
   (setq-local defun-prompt-regexp
 	      (concat "^\\(function[ \t]\\|[[:alnum:]]+[ \t]+()[ \t]+\\)"))
+  (setq-local add-log-current-defun-function #'sh-current-defun-name)
   ;; Parse or insert magic number for exec, and set all variables depending
   ;; on the shell thus determined.
   (sh-set-shell