Adapt the tool to projects compiled with dune

[krizex]

After compiling project with dune, it will generates the *.cmi/*.cmt files in a separate folder named .<name>.objs or .<name>.eobjs. Refer to: https://github.com/ocaml/dune/blob/master/src/utils.ml#L111 and https://github.com/ocaml/dune/blob/master/src/utils.ml#L116

For example:
When compiling https://github.com/xapi-project/xen-api project (Of course I haved added the flag -keep-locs and -bin-annot), the cmi and cmt files will be put into _build/default/ocaml/xapi/.xapi_internal.objs/ while the corresponding mli and ml files are in _build/default/ocaml/xapi.

So this patch aims to fix the search path when searching source files.

P.S. It also contains the fix of #8 as a separate small commit.

[alainfrisch]

Thanks!

The project is used in a context where the Str library is not available. Would you be as kind as to replace the single use of it by a more manual string analysis?

[krizex]

@alainfrisch Sure, changes updated.

1. Remove the Str dependency
2. Consider folder name both .<name>.objs and .<name>.eobjs
   Refer to dune code:
   https://github.com/ocaml/dune/blob/master/src/utils.ml#L111
   https://github.com/ocaml/dune/blob/master/src/utils.ml#L116

[alainfrisch]

Thanks!

[krizex]

Thanks @alainfrisch . BTW, as the release on opam is quite out of date, do you have a plan to release a new version so that we can use this tool with compiler 4.04.x ?