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From: Joel Reymont <joelr1@gmail.com>
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Date: Mon, 21 Mar 2011 20:17:52 +0000
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To: caml-list@inria.fr
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Subject: [Caml-list] oasis and thrift

I'm trying to use Apache Thrift with Oasis. 

Suppose I have a project directory structure that looks like this:

protocol\
    message1.thrift
    message2.thrift
    ...
ocaml\
    project1
    project2
    ...

OCaml projects use Oasis and automatically generate *.ml from *.thrift using a custom rule in ocamlbuild, e.g.

    open Ocamlbuild_plugin;;
    open Command;;
    
    let thrift = A"thrift";;
    
    rule "thrift: %.thrift -> %_types.ml"
      ~prods:["%.ml";"%_consts.ml";"%_types.ml";"%_types.mli"]
      ~deps:["%.thrift"]
      begin 
        fun env build ->
          Cmd(S[thrift; A"-gen"; A"ocaml"; P(env "%.thrift")])
      end
    ;;

I'm skipping the issue of parsing dependencies by looking at Thrift "include" directives for now but do want to define path to protocol in the Oasis file for each project. This is so that I can pass -I to thrift above.

How can this be done with Oasis?

	Thanks, Joel 

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