Simplify TASTy-MiMa support: handle Scala 2 via tlIsScala3 and remove redundant tlTastyMima

Author: the-ivii

docs/customization.md

@@ -27,7 +27,6 @@ Instead of using the super-plugins, for finer-grained control you can always add
 
 - `tlVersionIntroduced` (setting): A map `scalaBinaryVersion -> version` e.g. `Map("2.13" -> "1.5.2", "3" -> "1.7.1")` used to indicate that a particular `crossScalaVersions` value was introduced in a given version (default: empty).
 - `tlMimaPreviousVersions` (setting): A set of previous versions to compare binary-compatibility against.
-- `tlTastyMima` (setting): Enable TASTy-MiMa (default: `false`).
 
 ### sbt-typelevel-sonatype
 `TypelevelSonatypePlugin`: Sets up publishing to Sonatype/Maven.

mima/src/main/scala/org/typelevel/sbt/TypelevelMimaPlugin.scala

@@ -25,10 +25,11 @@ import sbttastymima.TastyMiMaPlugin
 import Keys._
 import MimaPlugin.autoImport._
 import TastyMiMaPlugin.autoImport._
+import TypelevelKernelPlugin.autoImport._
 
 object TypelevelMimaPlugin extends AutoPlugin {
 
-  override def requires = MimaPlugin && TastyMiMaPlugin
+  override def requires = TypelevelKernelPlugin && MimaPlugin && TastyMiMaPlugin
 
   override def trigger = allRequirements
 
@@ -38,7 +39,6 @@ object TypelevelMimaPlugin extends AutoPlugin {
         "A map scalaBinaryVersion -> version e.g. Map('2.13' -> '1.5.2', '3' -> '1.7.1') used to indicate that a particular crossScalaVersions value was introduced in a given version (default: empty).")
     lazy val tlMimaPreviousVersions = settingKey[Set[String]](
       "A set of previous versions to compare binary-compatibility against (default: auto-populated from git tags and the tlVersionIntroduced setting)")
-    lazy val tlTastyMima = settingKey[Boolean]("Enable TASTy-MiMa (default: false)")
   }
 
   import autoImport._
@@ -89,13 +89,12 @@ object TypelevelMimaPlugin extends AutoPlugin {
       else
         Set.empty
     },
-    tlTastyMima := false,
     tastyMiMaReportIssues := {
-      if (tlTastyMima.value && publishArtifact.value) tastyMiMaReportIssues.value
+      if (tlIsScala3.value && publishArtifact.value) tastyMiMaReportIssues.value
       else ()
     },
     tastyMiMaPreviousArtifacts := {
-      if (tlTastyMima.value && publishArtifact.value) {
+      if (tlIsScala3.value && publishArtifact.value) {
         tlMimaPreviousVersions
           .value
           .flatMap(v => V(v))