Add Gradle test fixtures migrator CLI (#181)

* Add Gradle test fixtures migrator CLI

* detekt issues

* Add a playground

* update API

* Spotless

Author: ZacSweers

api/kotlin-cli-util.api

@@ -25,6 +25,8 @@ public final class slack/cli/CliUtilKt {
 	public static synthetic fun filterByName$default (Lkotlin/sequences/Sequence;Ljava/lang/String;ZILjava/lang/Object;)Lkotlin/sequences/Sequence;
 	public static final fun filterByNamePath (Lkotlin/sequences/Sequence;Ljava/lang/String;Z)Lkotlin/sequences/Sequence;
 	public static synthetic fun filterByNamePath$default (Lkotlin/sequences/Sequence;Ljava/lang/String;ZILjava/lang/Object;)Lkotlin/sequences/Sequence;
+	public static final fun multipleSet (Lcom/github/ajalt/clikt/parameters/options/OptionWithValues;Ljava/util/Set;Z)Lcom/github/ajalt/clikt/parameters/options/OptionWithValues;
+	public static synthetic fun multipleSet$default (Lcom/github/ajalt/clikt/parameters/options/OptionWithValues;Ljava/util/Set;ZILjava/lang/Object;)Lcom/github/ajalt/clikt/parameters/options/OptionWithValues;
 	public static final fun skipBuildAndCacheDirs (Lkotlin/io/FileTreeWalk;)Lkotlin/io/FileTreeWalk;
 	public static final fun skipBuildAndCacheDirs (Lkotlin/io/path/FileVisitorBuilder;)V
 	public static final fun walkEachFile (Ljava/nio/file/Path;IZLkotlin/jvm/functions/Function1;)Lkotlin/sequences/Sequence;
@@ -49,6 +51,11 @@ public final class slack/cli/CommandFactoryKt {
 	public static synthetic fun runCommand$default ([Ljava/lang/String;ZILjava/lang/Object;)V
 }
 
+public final class slack/cli/Playground {
+	public static final fun main ()V
+	public static synthetic fun main ([Ljava/lang/String;)V
+}
+
 public final class slack/cli/Toml {
 	public static final field INSTANCE Lslack/cli/Toml;
 	public final fun parseVersion (Ljava/io/File;)Ljava/util/Map;
@@ -3463,6 +3470,21 @@ public final class slack/cli/gradle/GradleSettingsVerifierCli$Factory : slack/cl
 	public fun getKey ()Ljava/lang/String;
 }
 
+public final class slack/cli/gradle/GradleTestFixturesMigratorCli : com/github/ajalt/clikt/core/CliktCommand {
+	public static final field ANDROID_TEST_FIXTURES_BLOCK Ljava/lang/String;
+	public static final field DESCRIPTION Ljava/lang/String;
+	public static final field JAVA_FIXTURES_BLOCK Ljava/lang/String;
+	public fun <init> ()V
+	public fun run ()V
+}
+
+public final class slack/cli/gradle/GradleTestFixturesMigratorCli$Factory : slack/cli/CommandFactory {
+	public fun <init> ()V
+	public fun create ()Lcom/github/ajalt/clikt/core/CliktCommand;
+	public fun getDescription ()Ljava/lang/String;
+	public fun getKey ()Ljava/lang/String;
+}
+
 public final class slack/cli/lint/LintBaselineMergerCli : com/github/ajalt/clikt/core/CliktCommand {
 	public static final field DESCRIPTION Ljava/lang/String;
 	public fun <init> ()V

src/main/kotlin/slack/cli/CliUtil.kt

@@ -17,6 +17,10 @@
 
 package slack.cli
 
+import com.github.ajalt.clikt.core.MissingOption
+import com.github.ajalt.clikt.parameters.options.NullableOption
+import com.github.ajalt.clikt.parameters.options.OptionWithValues
+import com.github.ajalt.clikt.parameters.options.transformAll
 import java.io.File
 import java.nio.file.FileVisitResult
 import java.nio.file.Path
@@ -127,3 +131,31 @@ private fun List<String>.padNewline(): List<String> {
   val noEmpties = dropLastWhile { it.isBlank() }
   return noEmpties + ""
 }
+
+/**
+ * Make the option return a set of calls; each item in the set is the value of one call.
+ *
+ * If the option is never called, the set will be empty. This must be applied after all other
+ * transforms.
+ *
+ * ### Example:
+ * ```
+ * val opt: Set<Pair<Int, Int>> by option().int().pair().multipleSet()
+ * ```
+ *
+ * @param default The value to use if the option is not supplied. Defaults to an empty set.
+ * @param required If true, [default] is ignored and [MissingOption] will be thrown if no instances
+ *   of the option are present on the command line.
+ */
+public fun <EachT, ValueT> NullableOption<EachT, ValueT>.multipleSet(
+  default: Set<EachT> = emptySet(),
+  required: Boolean = false,
+): OptionWithValues<Set<EachT>, EachT, ValueT> {
+  return transformAll(showAsRequired = required) {
+    when {
+      it.isEmpty() && required -> throw MissingOption(option)
+      it.isEmpty() && !required -> default
+      else -> it
+    }.toSet()
+  }
+}