Re: syntax table in minibuffer

[Masatake YAMATO]

From: Stefan Monnier <address@hidden>
Date: Fri, 09 Sep 2011 21:44:19 -0400
>> When emacs reading file name, I'd like to make the point in minibuffer
>> to "/", the file name separator, with \M-\C-b and \M-\C-f.
>> Do you want, too?
> 
> I'm not sure I'd want that, but it does sound like a reasonable
> desire, yes.
> 
>> In my knowledge, I have to modify syntax table for minibuffer for
>> doing that. However, I cannot find something link
>> `minibuffer-local-filename-syntax-table'.
> 
>> Could you give me hints for that?
> 
> I think you'll need to use minibuffer-with-setup-hook around the
> relevant completing-read so as to setup the syntax-table with
> set-syntax-table.

Thank you. I've implemented base on your hit. 
New behaviors of \M-\C-f and \M-\C-b in \C-x\C-f are nice.
I'd like you to include this into the offcial emacs source tree.
We are in feature-freeze stage. What shoud I do?
Should I submit this to bug tracking system?

2011-09-12  Masatake YAMATO  <address@hidden>

        * minibuffer.el (minibuffer-local-filename-syntax): New variable.
        (read-file-name-default): Install the syntax table.

=== modified file 'lisp/minibuffer.el'
--- lisp/minibuffer.el  2011-09-02 00:36:58 +0000
+++ lisp/minibuffer.el  2011-09-12 07:38:03 +0000
@@ -1997,6 +1997,24 @@
   (funcall (or read-file-name-function #'read-file-name-default)
            prompt dir default-filename mustmatch initial predicate))
 
+
+(defvar minibuffer-local-filename-syntax 
+  (let ((table (make-syntax-table)))
+    (mapc
+     (lambda (c)
+       (modify-syntax-entry c "_" table))
+     '(?~ ?` ?! ?@ ?# ?$ ?% ?^ ?& ?* ?( ?) ?- ?_ ?= ?+ 
+         ?{ ?} ?[ ?] ?| ?\; ?\" ?'
+         ?, ?< ?. ?> ??))
+    (mapc
+     (lambda (c)
+       (modify-syntax-entry c "." table))
+     '(?/
+       ?: ?\\
+       ))
+    table)
+  "Syntax table to be used in minibuffer for reading file name.")
+
 ;; minibuffer-completing-file-name is a variable used internally in minibuf.c
 ;; to determine whether to use minibuffer-local-filename-completion-map or
 ;; minibuffer-local-completion-map.  It shouldn't be exported to Elisp.
@@ -2065,7 +2083,9 @@
                                (lambda ()
                                  (with-current-buffer
                                      (window-buffer 
(minibuffer-selected-window))
-                                  (read-file-name--defaults dir initial)))))
+                                  (read-file-name--defaults dir initial))))
+                         (set-syntax-table minibuffer-local-filename-syntax)
+                         )
                       (completing-read prompt 'read-file-name-internal
                                        pred mustmatch insdef
                                        'file-name-history default-filename)))