Re: Changes in mapconv

[Kenichi Handa <handa@m17n.org>]

In article <E1MFJRT-00076Q-Ti@fencepost.gnu.org>, Eli Zaretskii <eliz@gnu.org> writes:

> > Date: Fri, 12 Jun 2009 03:31:00 -0400
> > From: emacs-diffs-request@gnu.org
> > Reply-To: emacs-diffs@gnu.org
> > 
> > RCS file: /cvsroot/emacs/emacs/admin/charsets/mapconv,v
> > retrieving revision 1.5
> > retrieving revision 1.6
> > diff -u -b -r1.5 -r1.6
> > --- mapconv	8 Jan 2009 04:24:45 -0000	1.5
> > +++ mapconv	12 Jun 2009 07:22:48 -0000	1.6
> > @@ -30,34 +30,42 @@
> >  #   $1: source map file
> >  #   $2: address pattern for sed (optionally with substitution command)
> >  #   $3: format of source map file
> > -#	GLIBC-1 GLIBC-2 GLIBC-2-7 CZYBORRA IANA UNICODE YASUOKA MICROSOFT
> > +#	GLIBC-1 GLIBC-2 GLIBC-2-7 CZYBORRA IANA UNICODE YASUOKA
> > [...]
> >      YASUOKA)
> > -	SOURCE="http://kanji.zinbun.kyoto-u.ac.jp/~yasuoka/.../${BASE}";;
> > -    MICROSOFT)
> > -	SOURCE="http://www.microsoft.com/globaldev/reference/oem/${BASE}";;
> > +	BASE="$BASE.Z";
> > +	SOURCE="http://kanji.zinbun.kyoto-u.ac.jp/~yasuoka/ftp/CJKtable/${BASE}";;
> >      KANJI-DATABASE)

> Why were the MICROSOFT parts removed?  The log message does not reveal
> any reason, nor even tells about the removal.

The map files for CP720 and CP858 are now not available in
Microsoft's page.  So, I made them manually based on the
information in Wikipedia as written in
admin/charsets/mapfiles/README.  As a result,
admin/charset/Makefile doesn't call mapconv with MICROSOFT
as an arg, so I deleted that path from mapconv.

> Btw, is there any documentation on how to add support for character
> maps not in the current CVS?  The only information I see is this
> comment in the Makefile:

>     #  If your system doesn't have the directory /usr/share/i18n/charmaps,
>     #  get the source of the latest glibc, gzip all the charmap files in
>     #  the directory "localedate/charmaps", and set the variable
>     #  GLIBC_CHARMAPS to that directory.

> This has two disadvantages:

>   . You have no way of adding a charmap that is not in the glibc
>     sources.

You can do that by modifying Makefile, and the recent
changes don't change that aspect.

>   . Downloading the humongous glibc distro just to get a small part of
>     it is not my idea of fun.

> Suppose I wanted to add codepage 853 support to Emacs: how would I go
> about doing that?

(1) The most direct way is to add a define-charset call with
    a vector as the value of :map property.

(2) The 2nd direct way is to add a map file in etc/charsets.

(3) Create a file admin/charsets/mapfiles/CP853.map.gz manyally,
    and modify Makefile as these:
	Add CP853.map in CODEPAGE.
	Add these lines:

CP853.map: mapfiles/CP853.map.gz
	# Generating $@...
	@zcat $< > $@

(4) Store a freely available source file in
    admin/charset/mapfiles, and modify Makefile somehow to
    generate CP853.map from that file.

And, after any of (2)..(4), add define-charset call in
lisp/international/mule-conf to define a charset that use
that map file.

---
Kenichi Handa
handa@m17n.org