[Feature Request] elm 0.19 support

[mariohuizar]

Any plans to update for elm0.19?

[RavenDream]

@zwilias My plan is to modify elm-coverage in 4 ways:

1. Copy the ./elm.json file to .coverage/instrumented/elm.json
   • Convert the source directory paths into absolute paths except for the src folder that elm-instrument modified
   • copy the ./tests folder into `.coverage/instrumented/tests
   • Add the Coverage.elm file to the elm.json source directories, stop using native code and return () instead of never
2. Add a fake-elm script to the elm coverage package that passes arguments along to elm make. When elm-coverage invokes elm-test I will add the argument --compiler=fake-elm. The fake elm script will call elm make normally, then after elm make finishes successfully, look at the --output flag passed to elm make to modify the generated js code (In the current version of elm-test this file is called elmTestOutput.js). I will insert the old Native.Coverage.js impl by regex replacing the JS function definition corresponding to Coverage.track.
3. Run elm-test in the .coverage/instrumented directory instead of project root.
4. Read the generated coverage log files from the .coverage/instrumented/ directory instead of from .coverage.

[zwilias]

@RavenDream Awesome, that would be really cool. Some questions, though!

copy the ./tests folder into `.coverage/instrumented/tests

Any particular reason this would be required?

Run elm-test in the .coverage/instrumented directory instead of project root.

I think this already happens, doesn't it?

Read the generated coverage log files from the .coverage/instrumented/ directory instead of from .coverage.

Is there a specific reason for wanting to do this?

[zwilias]

Elm 0.19 support was just released as a beta - npm i elm-coverage@beta should get you the goods.

Some notes!

• huge thanks to @RavenDream for doing the bulk of the work on this repo. Much appreciated!
• no Windows support for now. I'll try to come up with a solution, but it's as of yet unclear what this will involve exactly
• I also updated elm-instrument to build on the latest elm-format so it can actually handle 0.19 syntax
• If you find anything that doesn't work but used to work before, please do let me know! (by opening issues 😉)