[elisp] Look for function that create safe file name from string...

[elisp] Look for function that create safe file name from string...

[Oleksandr Gavenko]

I decide store my message after sending it to mail/news.

As file name I use date and message header.

But message header may contain danger symbol. One of errors I get when '/'
char present in file name...

So I look for function that safely escape string to get file name in portable
for Emacs way...

-- 
Best regards!

Re: [elisp] Look for function that create safe file name from string...

[Pascal J. Bourguignon]

Oleksandr Gavenko <gavenkoa@gmail.com> writes:

> I decide store my message after sending it to mail/news.
>
> As file name I use date and message header.
>
> But message header may contain danger symbol. One of errors I get when '/'
> char present in file name...
>
> So I look for function that safely escape string to get file name in portable
> for Emacs way...

(defun alphanumericp (ch)
  (find ch "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"))
                                                                
    
(defun clean-filename (name)
  (remove-if-not (lambda (ch) (or (alphanumericp ch) (find ch "-_.")))
                 (substitute ?- 32 name)))

(clean-filename "Subject: Re: [elisp] Look for function that create
safe file name from string...")
--> "Subject-Re-elisp-Look-for-function-that-createsafe-file-name-from-string..."


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.

Re: [elisp] Look for function that create safe file name from string...

[Eli Zaretskii]

> From: Oleksandr Gavenko <gavenkoa@gmail.com>
> Date: Mon, 09 Jul 2012 22:12:07 +0300
> 
> I decide store my message after sending it to mail/news.
> 
> As file name I use date and message header.
> 
> But message header may contain danger symbol. One of errors I get when '/'
> char present in file name...
> 
> So I look for function that safely escape string to get file name in portable
> for Emacs way...

I think you will find a few ideas in make-auto-save-file-name.

Re: [elisp] Look for function that create safe file name from string...

[Oleksandr Gavenko]

From Eli Zaretskii:
> I think you will find a few ideas in make-auto-save-file-name.
>
I look sources and most useful thing I find (for me) is replacement of '/'
with '!'. Also this piece are good:

  ;; Restrict the characters used in the file name to those which
  ;; are known to be safe on all filesystems, url-encoding the
  ;; rest.
  ...
  (while (string-match "[^A-Za-z0-9-_.~#+]" buffer-name limit)
  ...

But I lose Russian chars...

On 2012-07-09, Pascal J. Bourguignon wrote:
> Oleksandr Gavenko <gavenkoa@gmail.com> writes:
>
>> I decide store my message after sending it to mail/news.
>>
>> As file name I use date and message header.
>>
>> But message header may contain danger symbol. One of errors I get when '/'
>> char present in file name...
>>
>> So I look for function that safely escape string to get file name in portable
>> for Emacs way...
>
> (defun alphanumericp (ch)
>   (find ch "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"))
>
> (defun clean-filename (name)
>   (remove-if-not (lambda (ch) (or (alphanumericp ch) (find ch "-_.")))
>                  (substitute ?- 32 name)))
>
I like your solution. But as I need Russian/Ukrainian chars I write another
code (without cl dependency):

  (defconst my-safe-filename-char-regex "[[:alnum:]-_!.@]"
    "Safe file names.")

  (defun my-clean-filename (filename)
    (mapconcat
     (lambda (ch) (or (when (string-match my-safe-filename-char-regex (char-to-string ch)) (char-to-string ch)) "-"))
     filename "") )

Resulted file name does not contain spaces, so I can easy write sh scripts on
these files.

Thanks for help to both!

-- 
Best regards!