MatchingDeclarationName rule to match single declaration to file name

[vanniktech]

If the file is named Foo.kt and there's only one declaration (object, class, enum or interface) this file name should match the declaration name.

Positive case:

Something.kt

object Something

Negative case:

Something.kt

object Somethin

Also I'd expect this check to work when there are top level variables declared:

Something.kt

const val MEANING_OF_LIFE = 42

object Something

What do you think?

[egor-n]

The rule would mark this file, for example:
https://github.com/arturbosch/detekt/blob/994c732c5f45ebdbb50a917b272f87a9c0f5916f/detekt-rules/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/complexity/ComplexConditionSpek.kt#L12

[arturbosch]

I want this rule too :D. Selfassigned.

[lock]

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