Added automated interface generation rule

.gitlab-ci.yml

@@ -12,6 +12,7 @@ tests:
   - if [ ! -d _opam ]; then echo "no local switch in the CI cache, we setup a new switch"; opam switch create --yes --no-install . ocaml-base-compiler.4.11.1; fi
   - eval $(opam env)
   - sudo apt-get update
+  - sudo apt install -y protobuf-compiler
   - opam repository add remote https://opam.ocaml.org
   - opam depext --yes ocplib-endian base fmt alt-ergo.2.4.0
   - opam install . --deps-only --with-test --yes

lib/onnx/dune

 (library
- (name onnx)
- (public_name onnx)
- (libraries base csv piqirun.pb)
- (synopsis "ONNX parser"))
+  (name onnx)
+  (public_name onnx)
+  (libraries base csv piqirun.pb)
+  (synopsis "ONNX parser"))
+(rule
+  (targets onnx_piqi.ml onnx_piqi.mli)
+  (action
+    (run ./generate_onnx_interface.sh)
+    )
+  (deps
+    onnx.proto
+    generate_onnx_interface.sh)
+  (mode
+    promote))

lib/onnx/generate_onnx_interface.sh

+#!/bin/sh
+
+piqi of-proto onnx.proto
+sed -ie 's/-START-VERSION/START-VERSION/' onnx.proto.piqi
+piqic-ocaml onnx.proto.piqi
+sed -ie 's/external/externall/g' onnx_piqi.ml
+ocamlfind ocamlc -package piqirun.pb -i onnx_piqi.ml > onnx_piqi.mli