Re: ange-ftp caching problems for remote nndir groups

Re: ange-ftp caching problems for remote nndir groups

[Lars Magne Ingebrigtsen]

Andy Norman <ange@hplb.hpl.hp.com> writes:

> Call ange-ftp-re-read-dir on the given directory if it is an ange-ftp
> filename.  That will nuke ange-ftp's cache of that directory.

What is the canonical way to check whether a given filename is an
ange-ftp filename or not?  I can think of some heuristics to use, but
is there a fail-safe method?

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@ifi.uio.no * Lars Ingebrigtsen

Re: ange-ftp caching problems for remote nndir groups

[William Perry]

Lars Magne Ingebrigtsen writes:
>Andy Norman <ange@hplb.hpl.hp.com> writes:
>
>> Call ange-ftp-re-read-dir on the given directory if it is an ange-ftp
>> filename.  That will nuke ange-ftp's cache of that directory.
>
>What is the canonical way to check whether a given filename is an
>ange-ftp filename or not?  I can think of some heuristics to use, but
>is there a fail-safe method?

  Calling it on a non-ange-ftp path doesn't do any harm, at least in XEmacs
19.14, so I would say just do it regardless (if ange-ftp is loaded of
course).  What is the equivalent for EFS?

-Bill P.

Re: ange-ftp caching problems for remote nndir groups

[Andy Norman]

Lars writes:

> What is the canonical way to check whether a given filename is an
> ange-ftp filename or not?  I can think of some heuristics to use, but
> is there a fail-safe method?

Something yukky like:

(defun remote-filename-p (path)
  (if (boundp 'ange-ftp-path-format)
      (save-match-data
	(string-match (car ange-ftp-path-format) path))
    (if (boundp 'efs-path-regexp)
	(save-match-data
	  (string-match efs-path-regexp path)))))

or some similar variant might work OK.
					-- ange -- <><

					ange@hplb.hpl.hp.com

Re: ange-ftp caching problems for remote nndir groups

[Andy Norman]

Bill writes:

> Lars Magne Ingebrigtsen writes:
>> Andy Norman <ange@hplb.hpl.hp.com> writes:
>> 
>>> Call ange-ftp-re-read-dir on the given directory if it is an ange-ftp
>>> filename.  That will nuke ange-ftp's cache of that directory.
>> 
>> What is the canonical way to check whether a given filename is an
>> ange-ftp filename or not?  I can think of some heuristics to use, but
>> is there a fail-safe method?

>   Calling it on a non-ange-ftp path doesn't do any harm, at least in XEmacs
> 19.14, so I would say just do it regardless (if ange-ftp is loaded of
> course).  What is the equivalent for EFS?

efs-re-read-dir.

					-- ange -- <><

					ange@hplb.hpl.hp.com

Re: ange-ftp caching problems for remote nndir groups

[Lars Balker Rasmussen]

William Perry <wmperry@monolith.spry.com> writes:
>   Calling it on a non-ange-ftp path doesn't do any harm, at least in XEmacs
> 19.14, so I would say just do it regardless (if ange-ftp is loaded of
> course).

Hmm, isn't ange-ftp always loaded?  On my emacs-19.31/linux, if I try
to expand an absolute filename, ange-ftp is (auto-)loaded.  I tend to
expand a lot of absolute filenames...
-- 
Lars Balker Rasmussen
<URL:http://www.daimi.aau.dk/~gnort/>  <URL:mailto:lars@rasmussen.org>

Re: ange-ftp caching problems for remote nndir groups

[Andy Norman]

Lars writes:

> Hmm, isn't ange-ftp always loaded?  On my emacs-19.31/linux, if I try
> to expand an absolute filename, ange-ftp is (auto-)loaded.  I tend to
> expand a lot of absolute filenames...

I belive that with GNU Emacs 19.x the whole of ange-ftp isn't loaded until you
start using pathnames that look like ange-ftp-style pathnames.

					-- ange -- <><

					ange@hplb.hpl.hp.com

Re: ange-ftp caching problems for remote nndir groups

[Jan Vroonhof]

Andy Norman <ange@hplb.hpl.hp.com> writes:

> Something yukky like:
> 
> (defun remote-filename-p (path)
>   (if (boundp 'ange-ftp-path-format)
>       (save-match-data
> 	(string-match (car ange-ftp-path-format) path))
>     (if (boundp 'efs-path-regexp)
> 	(save-match-data
> 	  (string-match efs-path-regexp path)))))
> 
> or some similar variant might work OK.
> 					-- ange -- <><

On my prebuild XEmacs 19.14 the variable ange-ftp-path-format is
defined without the ange-ftp package being loaded. Since I am using
efs ange-ftp.el never gets loaded, so I think this should be changed
to:


(defun nnheader-re-read-dir (path)
  "Re-read directory PATH if PATH is on a remote system."
    (if (or (fboundp 'efs-re-read-dir) (boundp 'efs-path-regexp))
	(when (string-match efs-path-regexp path)
	  (efs-re-read-dir path))
     (if (or (fboundp 'ange-ftp-re-read-dir) (boundp 'ange-ftp-path-format))
      (when (string-match (car ange-ftp-path-format) path)
	(ange-ftp-re-read-dir path)))
     ))

With the assumption that efs is always prefered over ange-ftp.

Jan

-- 
Jan Vroonhof                    http://www.math.ethz.ch/~vroonhof/
Mathematik,                                  vroonhof@math.ethz.ch
HG E16, ETH-Zentrum,                      Tel: +41-1-6325456/25154
Raemistrasse 101, CH-8092 Zuerich.              Fax: +41-1-6321085

Re: ange-ftp caching problems for remote nndir groups

[Andy Norman]

Jan writes:

> On my prebuild XEmacs 19.14 the variable ange-ftp-path-format is
> defined without the ange-ftp package being loaded. Since I am using
> efs ange-ftp.el never gets loaded, so I think this should be changed
> to:


> (defun nnheader-re-read-dir (path)
>   "Re-read directory PATH if PATH is on a remote system."
>     (if (or (fboundp 'efs-re-read-dir) (boundp 'efs-path-regexp))
> 	(when (string-match efs-path-regexp path)
> 	  (efs-re-read-dir path))
>      (if (or (fboundp 'ange-ftp-re-read-dir) (boundp 'ange-ftp-path-format))
>       (when (string-match (car ange-ftp-path-format) path)
> 	(ange-ftp-re-read-dir path)))
>      ))

> With the assumption that efs is always prefered over ange-ftp.

Agreed totally!  ;-)

					-- ange -- <><

					ange@hplb.hpl.hp.com

Re: ange-ftp caching problems for remote nndir groups

[Lars Magne Ingebrigtsen]

William Perry <wmperry@monolith.spry.com> writes:

>   Calling it on a non-ange-ftp path doesn't do any harm, at least in XEmacs
> 19.14, so I would say just do it regardless (if ange-ftp is loaded of
> course). 

So I could do something like:

(when (featurep 'ange-ftp) 
  (ange-ftp-re-read-dir dir))

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@ifi.uio.no * Lars Ingebrigtsen

Re: ange-ftp caching problems for remote nndir groups

[Andy Norman]

Joe writes:

> [ Sent to both Gnus and Ange-FTP mailing lists.  Please send replies to
>   both lists. ]

OK.

> In Gnus, scanning for new articles in a remote nndir group never finds new
> articles unless you kill the corresponding "*ftp ftp@foo.bar.dom*" buffer
> first.  This is because determining the "active file" information is done
> by listing the directory and ange-ftp caches the directory listing.

Yep.

> Any suggestions for a good solution?  The best solution would keep the
> internals of Gnus and Ange-FTP separated.

Call ange-ftp-re-read-dir on the given directory if it is an ange-ftp
filename.  That will nuke ange-ftp's cache of that directory.

					-- ange -- <><

					ange@hplb.hpl.hp.com

ange-ftp caching problems for remote nndir groups

[Joe Wells]

[ Sent to both Gnus and Ange-FTP mailing lists.  Please send replies to
  both lists. ]

In Gnus, scanning for new articles in a remote nndir group never finds new
articles unless you kill the corresponding "*ftp ftp@foo.bar.dom*" buffer
first.  This is because determining the "active file" information is done
by listing the directory and ange-ftp caches the directory listing.

Any suggestions for a good solution?  The best solution would keep the
internals of Gnus and Ange-FTP separated.

-- 
Joe Wells <jbw@cs.bu.edu>