feat: Add OCaml Binding

[Ranxy]

ref #2756

Added a simple OCaml binding to implement the blocking operator.

[Xuanwo]

Woooooooooooow

[Ranxy]

It seems that ocaml/setup-ocaml@v2 cannot be used directly in CI

[oowl]

It seems that ocaml/setup-ocaml@v2 cannot be used directly in CI

Maybe it's related to #2693 (comment), I think you can directly use shell command to install ocaml enviroment.

[Xuanwo]

As mentioned by @oowl, we require approval from ASF Infra for this action. The action appears to be maintained by ocaml.org, which is a trustworthy source. I have submitted a ticket at https://issues.apache.org/jira/browse/INFRA-24856 and now we need to wait for their response.

[Ranxy]

In order to package this project with ocaml's package manager opam, it seems that the files bindings/ocaml/dune-project and bindings/ocaml/opendal.opam need to be moved to the top level directory of the project. Will this be a problem?

[Ranxy]

In order to package this project with ocaml's package manager opam, it seems that the files bindings/ocaml/dune-project and bindings/ocaml/opendal.opam need to be moved to the top level directory of the project. Will this be a problem?

This is because opam will take the directory of dune-project as the root directory of the project, and copy this directory to a separate directory for compilation and packaging. If dune-project is in bindings/ocaml, then it cannot be built after copying this directory alone. Because this is part of the entire workspace in the rust project and cannot be compiled separately.

[Xuanwo]

Will this be a problem?

Yes, it's better to avoid such things from happening. Does the link core/ work here?

[Ranxy]

Will this be a problem?

Yes, it's better to avoid such things from happening. Does the link core/ work here?

It is not very clear at the moment, let me try to find an alternative solution to solve this problem.

[Xuanwo]

It is not very clear at the moment, let me try to find an alternative solution to solve this problem.

Thanks for the research. I don't think there's a block preventing us from merging this PR, so we can continue working on this binding and address any package issues later.

[Xuanwo]

Hi, setup-ocaml has been approved. Please add some new commits to have a try.

[Xuanwo]

Mostly LGTM! It's quiet intereting to see opendal on OCaml.

[Xuanwo]

Great, mostly LGTM!

Would you like to start a tracking issue for the future issues of ocaml binding?

[Ranxy]

Great, mostly LGTM!

Would you like to start a tracking issue for the future issues of ocaml binding?

Of course it's exciting.