Re-try parsing files

[miniBill]

Sometimes, especially when using elm-codegen the files may temporarily be invalid Elm code. My suggestion is that if a file fails to parse, try to read it again from disk after a small while, and - if it's different - try parsing again.

[jfmengels]

Do you mean in --watch mode?
I have seen cases where files would not get re-updated, but I haven't investigated yet.

Do you have any clue as to the cause in your situation? In the sense, do you think it's because the file is very large and takes a while to be written completely to disk? I don't know if our file watcher triggers when a file starts being written, or when it's done writing. I was hoping it would be the latter but it could be the former.

[miniBill]

Yeah, this is relevant in --watch mode.

I think it might be that the file is large? To detect when the file is done writing you could wait for a close on it? But I'm not sure if editors do that or just keep the file open

[jfmengels]

Alright, there's apparently a bunch of settings we can use in chokidar to better configure the watching. And that includes an option to wait until something is done writing. So that's encounraging 👍

[jfmengels]

Note to self, this is what node-test-runner is doing: https://github.com/rtfeldman/node-test-runner/blob/0.19.1-revision17/lib/RunTests.js#L153-L167