A linter to help you avoid wildcard pattern matching.
This rule prevents you from unintentionally adding a case to a pattern match that would match everything. The Scala compiler can do exhaustive checking of pattern match in certain condition. Having a catch all case in the pattern match will make the compiler happy when in reality some cases would be better handled by a specific case.
The rule looks for:
- case where the
_wild card is used with no guards - case where the pattern is just a variable that does not start with
_with no guards
You can disable the rule in a given scope using the @SuppressWarnings("MatchAll") annotation.
Currently, this rule is not published on maven central, as such, the only way to run it is from source. See the scalafix website for more info.
scalafix --rules=https://raw.githubusercontent.com/daddykotex/scalafix-matchall/main/rules/src/main/scala/fix/MatchAll.scala
To develop rule:
sbt ~tests/test
# edit rules/src/main/scala/fix/MatchAll.scala