Add CMake modules for finding and and executing Fusion

[msteinbeck]

Note that the CMake modules are licensed under the same terms as those modules shipped with CMake (the BSD 3-Clause License). I know that Fusion is licensed under the terms of the GPLv3 license, but I'm not sure what the implications are if these modules are included in other projects.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.39%. Comparing base (850a29f) to head (cad2da2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #206   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files           2        2           
  Lines       18430    18433    +3     
=======================================
+ Hits        17766    17769    +3     
  Misses        546      546           
  Partials      118      118           

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[pfusik]

Thank you very much for your contribution! Sorry for late review.
I think it's okay license-wise, as your CMake modules are clearly a separate work from the transpiler itself. This is similar to e.g. GCC and other GNU tools.

[pfusik]

Suggested change

	[RESOURCES <file1.fu> <file2.fu> ...]
	[REFERENCE <file1.fu> <file2.fu> ...]

Or perhaps REFERENCES ?
This option should be named similarily to the C# compiler's -r option. Does csc have a CMake package?

[msteinbeck]

Done.

Does csc have a CMake package?

As far as I know, you can build C# projects with CMake. However, I'm not aware of a CMake package for csc.

[pfusik]

If it's SOURCES, it should be REFERENCES with an S.
It looks like CMake 3.8 has C# support, and the property is called VS_DOTNET_REFERENCES.

[msteinbeck]

I extended the example with Lua bindings generated via SWIG from the Fusion-transpiled C++ library. This could serve as an indication that additional languages can be targeted through the C/C++ output.

[msteinbeck]

Thank you very much for your contribution! Sorry for late review.

No worries! Thank you for this awesome project!

[pfusik]

I extended the example with Lua bindings generated via SWIG from the Fusion-transpiled C++ library. This could serve as an indication that additional languages can be targeted through the C/C++ output.

That's an interesting idea! I'm just afraid this could be confusing for people just starting with Fusion. I'd prefer to document it instead.
BTW. Fusion might get transpiled to Lua some day: #98.

[pfusik]

Feel free to add GitHub Actions and/or Travis CI configuration to test these CMake modules, starting with fut's make install.

[pfusik]

I don't like this native { #include }. Let's remove it and move fibonacci.fu from REFERENCES to SOURCES.
This way this test source could be reused for different languages.