re2c should install unicode_categories.re somewhere

[terpstra]

Firstly, re2c v1.2 is great!

I am now using more than half of the new feature included in that release:

• the new EOF rule made it easy to be 8-bit clean (before I terminated on nulls)
• using include files let me shared unicode definitions between files
• i ditched all my \uxxxx escapes and now use input-encoding utf8
• the new difference operator on utf8 charsets saved me several very large classes
• i eliminated my 're2c; mv' work-arounds for 're2c -o'

My only complaint: because re2c does not install 'unicode_categories.re', I had to copy that file into my own source repository. I would have preferred to just include re2c's installed copy in my build flow.

[skvadrik]

@terpstra , you should really thank yourself for asking for all those features. :D

I'm a bit uncertain whether re2c should install unicode_categories.re in the usual include path like /usr/include. If yes, then it is only a matter of adding the file to include_HEADERS Automake variable, as described here.

[terpstra]

If you're asking my opinion, then I think you should put it into /usr/share/re2c/stdlib.

From the manual of automake:

pkgdatadir

The directory for installing idiosyncratic read-only architecture-independent data files for this program. This is usually the same place as ‘datarootdir’, but we use the two separate variables so that you can move these program-specific files without altering the location for Info files, man pages, etc.

The default is $(datarootdir).

The definition of ‘datadir’ is the same for all packages, so you should install your data in a subdirectory thereof. Most packages install their data under $(datadir)/package-name/.

[terpstra]

To do this, you need:

 pkgstdlibdir = $(pkgdatadir)/re2c/stdlib
 dist_pkgstdlib_DATA = $(srcdir)/include/*.re

[terpstra]

As a bonus feature, you could/should automatically search this 'stdlib' directory when processing re2c include directives. Otherwise, you would need a mechanism (like pkg-config) to inform the user about where re2c was installed (/usr, /usr/local, /opt/local, ...) in order to set the correct '-I' when invoking re2c.

[skvadrik]

@terpstra I did as you suggested (c3880fc), except that I used $(datadir)/re2c/stdlib instead of $(pkgdatadir)/re2c/stdlib --- the latter implicitly adds /re2c. Special thanks for reminding me to use this location when looking for include files.

[skvadrik]

Released re2c-1.2.1 with the fix. Closing the bug for now.