Make subword.el easier to customize (tiny change)

* lisp/progmodes/subword.el (subword-forward-function)
(subword-backward-function, subword-forward-regexp, subword-backward-regexp):
New variables.
(subword-forward, subword-forward-internal, subword-backward-internal):
Use new variables, eg so that different "word" definitions can be easily used.

Fixes: debbugs:11411

2 files changed, 27 insertions, 10 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index cc42b1493ee..2202b4c7632 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,12 @@
+2012-08-16  Phil Sainty  <psainty@orcon.net.nz>  (tiny change)
+
+        * progmodes/subword.el (subword-forward-function)
+        (subword-backward-function, subword-forward-regexp)
+        (subword-backward-regexp): New variables.
+        (subword-forward, subword-forward-internal, subword-backward-internal):
+        Use new variables, eg so that different "word" definitions
+        can be easily used.  (Bug#11411)
+
 2012-08-15  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * vc/vc-mtn.el (vc-mtn-revision-completion-table): Handle completion
diff --git a/lisp/progmodes/subword.el b/lisp/progmodes/subword.el
index 7d8dd4301a2..e541aed8867 100644
--- a/lisp/progmodes/subword.el
+++ b/lisp/progmodes/subword.el
@@ -80,6 +80,20 @@
 
 ;;; Code:
 
+(defvar subword-forward-function 'subword-forward-internal
+  "Function to call for forward subword movement.")
+
+(defvar subword-backward-function 'subword-backward-internal
+  "Function to call for backward subword movement.")
+
+(defvar subword-forward-regexp
+  "\\W*\\(\\([[:upper:]]*\\W?\\)[[:lower:][:digit:]]*\\)"
+  "Regexp used by `subword-forward-internal'.")
+
+(defvar subword-backward-regexp
+  "\\(\\(\\W\\|[[:lower:][:digit:]]\\)\\([[:upper:]]+\\W*\\)\\|\\W\\w+\\)"
+  "Regexp used by `subword-backward-internal'.")
+
 (defvar subword-mode-map
   (let ((map (make-sparse-keymap)))
     (dolist (cmd '(forward-word backward-word mark-word kill-word
@@ -138,10 +152,10 @@ Optional argument ARG is the same as for `forward-word'."
   (cond
    ((< 0 arg)
     (dotimes (i arg (point))
-      (subword-forward-internal)))
+      (funcall subword-forward-function)))
    ((> 0 arg)
     (dotimes (i (- arg) (point))
-      (subword-backward-internal)))
+      (funcall subword-backward-function)))
    (t
     (point))))
 
@@ -249,9 +263,7 @@ Optional argument ARG is the same as for `capitalize-word'."
   (if (and
        (save-excursion
          (let ((case-fold-search nil))
-           (re-search-forward
-            (concat "\\W*\\(\\([[:upper:]]*\\W?\\)[[:lower:][:digit:]]*\\)")
-            nil t)))
+           (re-search-forward subword-forward-regexp nil t)))
        (> (match-end 0) (point)))
       (goto-char
        (cond
@@ -265,11 +277,7 @@ Optional argument ARG is the same as for `capitalize-word'."
 (defun subword-backward-internal ()
   (if (save-excursion
         (let ((case-fold-search nil))
-          (re-search-backward
-           (concat
-            "\\(\\(\\W\\|[[:lower:][:digit:]]\\)\\([[:upper:]]+\\W*\\)"
-            "\\|\\W\\w+\\)")
-           nil t)))
+          (re-search-backward subword-backward-regexp nil t)))
       (goto-char
        (cond
         ((and (match-end 3)