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vc directory mode confused by Japanese date string.


From: ishikawa
Subject: vc directory mode confused by Japanese date string.
Date: Sun, 24 Nov 2002 14:51:48 +0900 (JST)

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In GNU Emacs 21.2.1 (i686-pc-linux-gnu, X toolkit)
 of 2002-04-06 on duron
Important settings:
  value of $LC_ALL: ja_JP.ujis
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ja_JP.ujis
  locale-coding-system: japanese-iso-8bit
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hi,

I recently tried to use CVS mode extensively in Emacs 21.2
and I noticed a potential CVS mode problem in vc.el.

When I tried to use vc-directory mode invoked
from the "Tools" menu,
the vc directory mode refuses my attempt to mark
a file or anything claiming there is not a file on
the line or with some such message.

This rings a bell.  I have seen similar bugs
with the standard dired.el (acutally electric-buffer mode) 
before.

I use Emacs on Linux (and Sun Solaris at the office)
and use Japanese locale for some time now.

The localized/Japanized output of "ls" command
puts a Japanese date string in its output
and, in the past, it confused Emacs directory mode 
until proper regular expression was put into lisp library
to match the Japanese date that appears on the ls output.

That is, the Japanese date string broke 
the handling of dired mode
and the proper file name was not recognized until the fix
was put into place. This only surfaced when many OS vendors
Sun Microsystems, HP, DEC and others began offering I18N/L10N
binaries.

So I checked the source file, dired.el and vc.el and 
tried to see if there is a difference in the matching/handling of
the Japanese date string in the ls output lines.

Indeed, there seems to be a difference between
the two. 

The following pieces of code
are what I think the relevant code (acutally
the regular expression) to catch Japanese date string.
The former is from dired.el
and the latter is from vc.el.

You can see that there is a subtle difference between the two
regarding how the regular expression for Japanese date is created. I
think this is the cause of the vc directory mode failing due to
Japanese date string on the ls output line.

The relevant lines are marked with "-->" at the
beginning of line below.

May I suggest that you modify the "(japanese ...)" in vc.el
line to match the line from dired.el?
(The dired.el works just fine and has been
working since the localization issues surfaced several
years ago.)


(1) From dired.el

(defvar dired-move-to-filename-regexp
  (let* ((l "\\([A-Za-z]\\|[^\0-\177]\\)")
         ;; In some locales, month abbreviations are as short as 2 letters,
         ;; and they can be padded on the right with spaces.
         ;; weiand: changed: month ends potentially with . or , or .,
;;old    (month (concat l l "+ *"))
         (month (concat l l "+[.]?,? *"))
         ;; Recognize any non-ASCII character.
         ;; The purpose is to match a Kanji character.
         (k "[^\0-\177]")
         ;; (k "[^\x00-\x7f\x80-\xff]")
         (s " ")
         (yyyy "[0-9][0-9][0-9][0-9]")
         (mm "[ 0-1]?[0-9]")
;;old    (dd "[ 0-3][0-9]")
         (dd "[ 0-3][0-9][.]?")
         (HH:MM "[ 0-2][0-9]:[0-5][0-9]")
         (seconds "[0-6][0-9]\\([.,][0-9]+\\)?")
         (zone "[-+][0-2][0-9][0-5][0-9]")
         (iso-mm-dd "[01][0-9]-[0-3][0-9]")
         (iso-time (concat HH:MM "\\(:" seconds "\\( ?" zone "\\)?\\)?"))
         (iso (concat "\\(\\(" yyyy "-\\)?" iso-mm-dd "[ T]" iso-time
                      "\\|" yyyy "-" iso-mm-dd " ?\\)"))
         (western (concat "\\(" month s dd "\\|" dd s month "\\)"
         ;; weiand: changed: year potentially unaligned
;;old                     s "\\(" HH:MM "\\|" s yyyy "\\|" yyyy s "\\)"))
                          s "\\(" HH:MM
                                  "\\|" yyyy s s "?"
                                  "\\|" s "?" yyyy
                             "\\)"))
--->     (japanese
--->      (concat mm k "?" s dd k "?" s "+"
--->              "\\(" HH:MM "\\|" yyyy k "?" "\\)")))
         ;; The "[0-9]" below requires the previous column to end in a digit.
         ;; This avoids recognizing `1 may 1997' as a date in the line:
         ;; -r--r--r--   1 may      1997        1168 Oct 19 16:49 README
         ;; The "[kMGTPEZY]?" below supports "ls -alh" output.
         ;; The ".*" below finds the last match if there are multiple matches.
         ;; This avoids recognizing `jservice  10  1024' as a date in the line:
         ;; drwxr-xr-x  3 jservice  10  1024 Jul  2  1997 esg-host
    (concat ".*[0-9][kMGTPEZY]?" 
            s "\\(" western "\\|" japanese "\\|" iso "\\)" s))
  "Regular expression to match up to the file name in a directory listing.
The default value is designed to recognize dates and times
regardless of the language.")


|CI's comment: The above will produce something like the following.
|
|   mm k "?" s dd k "?" s "+" ( "HH:MM" | yyyy k "?" )



(2) From vc.el.


(define-derived-mode vc-dired-mode dired-mode "Dired under VC"
  "The major mode used in VC directory buffers.

It works like Dired, but lists only files under version control, with
the current VC state of each file being indicated in the place of the
file's link count, owner, group and size.  Subdirectories are also
listed, and you may insert them into the buffer as desired, like in
Dired.

All Dired commands operate normally, with the exception of `v', which
is redefined as the version control prefix, so that you can type
`vl', `v=' etc. to invoke `vc-print-log', `vc-diff', and the like on
the file named in the current Dired buffer line.  `vv' invokes
`vc-next-action' on this file, or on all files currently marked.
There is a special command, `*l', to mark all files currently locked."
  ;; define-derived-mode does it for us in Emacs-21, but not in Emacs-20.
  ;; We do it here because dired might not be loaded yet
  ;; when vc-dired-mode-map is initialized.
  (set-keymap-parent vc-dired-mode-map dired-mode-map)
  (make-local-hook 'dired-after-readin-hook)
  (add-hook 'dired-after-readin-hook 'vc-dired-hook nil t)
  ;; The following is slightly modified from dired.el,
  ;; because file lines look a bit different in vc-dired-mode.
  (set (make-local-variable 'dired-move-to-filename-regexp)
       (let*
          ((l "\\([A-Za-z]\\|[^\0-\177]\\)")
           ;; In some locales, month abbreviations are as short as 2 letters,
           ;; and they can be padded on the right with spaces.
           (month (concat l l "+ *"))
           ;; Recognize any non-ASCII character.
           ;; The purpose is to match a Kanji character.
           (k "[^\0-\177]")
           ;; (k "[^\x00-\x7f\x80-\xff]")
           (s " ")
           (yyyy "[0-9][0-9][0-9][0-9]")
           (mm "[ 0-1][0-9]")
           (dd "[ 0-3][0-9]")
           (HH:MM "[ 0-2][0-9]:[0-5][0-9]")
           (western (concat "\\(" month s dd "\\|" dd s month "\\)"
                            s "\\(" HH:MM "\\|" s yyyy"\\|" yyyy s "\\)"))
--->       (japanese (concat mm k s dd k s "\\(" s HH:MM "\\|" yyyy k "\\)")))
         ;; the .* below ensures that we find the last match on a line
         (concat ".*" s "\\(" western "\\|" japanese "\\)" s)))
  (and (boundp 'vc-dired-switches)
       vc-dired-switches
       (set (make-local-variable 'dired-actual-switches)
            vc-dired-switches))
  (set (make-local-variable 'vc-dired-terse-mode) vc-dired-terse-display)
  (setq vc-dired-mode t))

========================================

The above will produce something like the following.

           mm k s dd k s ( s HH:MM |  yyyy k )

This differs from the one in dired.el mentioned above.
       >   mm k "?" s dd k "?" s "+" ( "HH:MM" | yyyy k "?" )

I think you may even want to simply re-use the value of 
"(defvar dired-move-to-filename-regexp ..." in dired.el
without definining a new variable locally here since
I suspect that the dired.el is more likely to be changed 
according to the need of I18N/L10N issues and
if you simply re-use the value, then you don't have to worry
about the issue yourself.

[end of message]




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I recently tried to use CVS mode e"
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