From: Marcin Borkowski <mbork@wmi.amu.edu.pl>
To: "help-gnu-emacs\@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: How to check whether a character (or one-character string) is a letter?
Date: Sun, 05 Oct 2014 02:08:38 +0200 [thread overview]
Message-ID: <874mvjml89.fsf@wmi.amu.edu.pl> (raw)
In-Reply-To: <CAP_d_8V7itX8shGC3enP4-B91_vjRdtR36MyhGB-AW96uYy4aw@mail.gmail.com>
On 2014-10-04, at 06:08, Yuri Khan wrote:
> On Sat, Oct 4, 2014 at 7:29 AM, Marcin Borkowski <mbork@wmi.amu.edu.pl> wrote:
>
>> The reason I'm asking is that I'm writing a function which converts an
>> arbitrary string to a valid (and nice) filename (e.g., only letters and
>> hyphens) - so basically I want to walk a string character by character
>> and convert any space to a hyphen and omit any other non-letter. Am I
>> reinventing the wheel?
>
> What are your assumptions about input string arbitrariness, your
> requirements about output filename niceness, and your requirements
> about the properties of the mapping?
>
> Because these may be in conflict.
>
> For example, if you assume any arbitrary strings, want only
> [-0-9A-Za-z_] characters, and want reasonably different strings to map
> into different filenames, then you will end up having to preserve
> non-nice characters as ugly character encodings (in the spirit of
> urlencode, XML character references, or Punycode). Otherwise, whole
> words or sentences in Russian, Japanese or Greek will map into an
> empty filename.
Good point. However, I intend to keep a list of filenames, and in case
some of them is already taken, append a number to it. (This is an
extremely primitive hashing function, but it will suffice for my needs.)
Regards,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Adam Mickiewicz University
next prev parent reply other threads:[~2014-10-05 0:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-04 0:29 How to check whether a character (or one-character string) is a letter? Marcin Borkowski
2014-10-04 1:38 ` Thorsten Jolitz
[not found] ` <CAOj2CQQsnNxtUPzPV8Vw_DgfGFXUUkZExHbArAu_zDjQn-prvw@mail.gmail.com>
2014-10-04 2:47 ` Fwd: " John Mastro
2014-10-05 0:11 ` Marcin Borkowski
2014-10-04 2:58 ` Eric Abrahamsen
2014-10-04 4:08 ` Yuri Khan
2014-10-05 0:08 ` Marcin Borkowski [this message]
2014-10-04 7:29 ` Eli Zaretskii
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