bug#11856: 24.0.97; Improve imenu expression of sh-script mode to handle "function FOO"

[Masatake YAMATO]

This is not a bug report. This is a request for reviwing and merging a
patch.

With this patch foo in following shell script can be captured
as an imenu entry.

    function foo
    {
      ...

(Even witohut this patch

     function foo()
     {
       ...

and

     foo()
     {
      ...

can be captured.)


2012-07-04  Masatake YAMATO  <yamato@redhat.com>

        * progmodes/sh-script.el (sh-imenu-generic-expression): Capture
        a function with `function' keyword and without parentheses like
        "function FOO".

=== modified file 'lisp/progmodes/sh-script.el'
--- lisp/progmodes/sh-script.el 2012-05-11 14:24:50 +0000
+++ lisp/progmodes/sh-script.el 2012-07-04 03:57:10 +0000
@@ -327,8 +327,15 @@
 (defcustom sh-imenu-generic-expression
   `((sh
      . ((nil
-         "^\\s-*\\(function\\s-+\\)?\\([[:alpha:]_][[:alnum:]_]+\\)\\s-*()"
-         2))))
+        ;; function FOO
+        ;; function FOO()
+         "^\\s-*function\\s-+\\\([[:alpha:]_][[:alnum:]_]+\\)\\s-*\\(?:()\\)?"
+         1)
+       ;; FOO()
+       (nil
+        "^\\s-*\\([[:alpha:]_][[:alnum:]_]+\\)\\s-*()"
+        1)
+       )))
   "Alist of regular expressions for recognizing shell function definitions.
 See `sh-feature' and `imenu-generic-expression'."
   :type '(alist :key-type (symbol :tag "Shell")