Add linting

[jnfeinstein]

I've added org.jmailen.kotlinter plugin, which is my go-to ktlint plugin for gradle (org.jlleitschuh.gradle.ktlint uses gradle features that are being deprecated in 7.0). The only manual changes are found in the root build.gradle.kts and .editorconfig. The rest of the changes are autogenerated using the linter.

The linter is executed using ./gradlew lintKotlin to check styling, and ./gradlew formatKotlin to auto-correct styling.

[jnfeinstein]

@Tapac these were the only changes I had to make manually, the linter did not like moving the = sign to the previous line. Ideally in this case I would use brackets and return, but the list of generics is long and it is useful to have them computed transparently in this case.

[jnfeinstein]

@Tapac just updated this branch.

[hfhbd]

How about adding this to the CI?

[jnfeinstein]

@hfhbd 99% certain that the plugin adds lintKotlin to the test or check phase. If not then I am not opposed to adding in a separate PR. I figured this one would install the plugin and baseline the code, which is a process unto itself.

[Tapac]

Your PR was squashed to master manually, so I'll close the PR.

[BorzdeG]

Why did you use kotliner? why not https://github.com/arturbosch/detekt/?

[jnfeinstein]

Kotlinter is a gradle plugin wrapper for ktlint. I've used it before, it's easy and works well. Please submit a PR if you think the project could benefit from using detekt. 🙂