Re: [Caml-list] camlp4 & OCaml 4.08

[Sylvain Le Gall <sylvain@le-gall.net>]

AFAIR, it only extracts "s_ STRING". You just need something that will
pattern match a function name ("s_") and a string.

I don't know enough PPX to decide if it is easy to port or not. I'll
gladly integrate anything that will replace campl5/campl4 by PPX.

Feel free to send me PR on this.
Regards
Sylvain

Le sam. 29 juin 2019 à 12:52, Richard W.M. Jones <rich@annexia.org> a écrit :
>
> On Sat, Jun 29, 2019 at 10:17:02AM +0000, David Allsopp wrote:
> > > On 29 Jun 2019, at 10:44, Richard W.M. Jones <rich@annexia.org> wrote:
> > >
> > >> On Sat, Jun 29, 2019 at 10:06:15AM +0100, Anil Madhavapeddy wrote:
> > >>> On 27 Jun 2019, at 14:45, Richard W.M. Jones <rich@annexia.org> wrote:
> > >>>
> > >>>
> > >>> I know camlp4 is dead and all that, but we've got some software which
> > >>> still uses it.  I will probably port it to camlp5 when I have the
> > >>> time, but has anyone got the patch to make camlp4 work with 4.08?
> > >>
> > >>
> > >> To fork the thread slightly,  how big are the camlp4 dependencies remaining
> > >> in your codebase, and is there anything we can do to help migrate?
> > >
> > > The dependencies that I care about run through ocaml-gettext.  Gettext
> > > is a specific method to make code internationalized and by its nature
> > > it involves deep changes throughout our codebase, so porting away from
> > > ocaml-gettext isn't an option any time soon.  However porting
> > > ocaml-gettext to use something else might be.
> > >
> > > ocaml-gettext has a tool which runs over the OCaml source code and
> > > extracts the magic translatable strings, and it's my understanding
> > > that this is the only reason it uses camlp4.  AIUI this cannot be done
> > > using ppx's (maybe I'm wrong about that?) but could be done using
> > > camlp5.  In fact it was me who did the original port of ocaml-gettext
> > > from old camlp4 (ie. camlp5) to camlp4(!)
> >
> > It’s not instantly clear to my (non-expert) eyes why this can’t be done with PPX. If I read the camlp4 script correctly, it doesn’t introduce any new syntax, it just matches on particular function calls and rewrites them?
>
> Actually I believe it simply extracts the string parameters into a
> separate file (from where they get translated).  However it's a
> separate tool, it doesn't run as part of ordinary compilation.
>
> Rich.
>
> --
> Richard Jones