Introduce Scalafmt (#2562)

.scalafmt.conf

@@ -0,0 +1,6 @@
+maxColumn = 120
+continuationIndent.defnSite = 2
+assumeStandardLibraryStripMargin = true
+danglingParentheses = true
+rewrite.rules = [AvoidInfix, SortImports, RedundantBraces, RedundantParens, SortModifiers]
+docstrings = JavaDoc

alleycats-core/src/main/scala/alleycats/ConsK.scala

@@ -17,4 +17,3 @@ object ConsK extends ConsK0 {
 
 @imports[ConsK]
 trait ConsK0
-

alleycats-core/src/main/scala/alleycats/std/map.scala

@@ -9,21 +9,25 @@ trait MapInstances {
 
   // toList is inconsistent. See https://github.com/typelevel/cats/issues/1831
   implicit def alleycatsStdInstancesForMap[K]: Traverse[Map[K, ?]] =
-    new Traverse[Map[K, ?]]  {
+    new Traverse[Map[K, ?]] {
 
       def traverse[G[_], A, B](fa: Map[K, A])(f: A => G[B])(implicit G: Applicative[G]): G[Map[K, B]] = {
         val gba: Eval[G[Map[K, B]]] = Always(G.pure(Map.empty))
-        val gbb = Foldable.iterateRight(fa, gba){ (kv, lbuf) =>
-          G.map2Eval(f(kv._2), lbuf)({ (b, buf) => buf + (kv._1 -> b)})
-        }.value
+        val gbb = Foldable
+          .iterateRight(fa, gba) { (kv, lbuf) =>
+            G.map2Eval(f(kv._2), lbuf)({ (b, buf) =>
+              buf + (kv._1 -> b)
+            })
+          }
+          .value
         G.map(gbb)(_.toMap)
       }
 
       override def map[A, B](fa: Map[K, A])(f: A => B): Map[K, B] =
         fa.map { case (k, a) => (k, f(a)) }
 
       def foldLeft[A, B](fa: Map[K, A], b: B)(f: (B, A) => B): B =
-        fa.foldLeft(b) { case (x, (k, a)) => f(x, a)}
+        fa.foldLeft(b) { case (x, (k, a)) => f(x, a) }
 
       def foldRight[A, B](fa: Map[K, A], lb: Eval[B])(f: (A, Eval[B]) => Eval[B]): Eval[B] =
         Foldable.iterateRight(fa.values, lb)(f)
@@ -45,11 +49,13 @@ trait MapInstances {
 
       override def toList[A](fa: Map[K, A]): List[A] = fa.values.toList
 
-      override def collectFirst[A, B](fa: Map[K, A])(pf: PartialFunction[A, B]): Option[B] = fa.collectFirst(new PartialFunction[(K, A), B] {
-        override def isDefinedAt(x: (K, A)) = pf.isDefinedAt(x._2)
-        override def apply(v1: (K, A)) = pf(v1._2)
-      })
+      override def collectFirst[A, B](fa: Map[K, A])(pf: PartialFunction[A, B]): Option[B] =
+        fa.collectFirst(new PartialFunction[(K, A), B] {
+          override def isDefinedAt(x: (K, A)) = pf.isDefinedAt(x._2)
+          override def apply(v1: (K, A)) = pf(v1._2)
+        })
 
-      override def collectFirstSome[A, B](fa: Map[K, A])(f: A => Option[B]): Option[B] = collectFirst(fa)(Function.unlift(f))
+      override def collectFirstSome[A, B](fa: Map[K, A])(f: A => Option[B]): Option[B] =
+        collectFirst(fa)(Function.unlift(f))
     }
 }

alleycats-core/src/main/scala/alleycats/std/set.scala

@@ -80,15 +80,15 @@ object SetInstances {
 
       override def get[A](fa: Set[A])(idx: Long): Option[A] = {
         @tailrec
-        def go(idx: Int, it: Iterator[A]): Option[A] = {
+        def go(idx: Int, it: Iterator[A]): Option[A] =
           if (it.hasNext) {
-            if (idx == 0) Some(it.next) else {
+            if (idx == 0) Some(it.next)
+            else {
               it.next
               go(idx - 1, it)
             }
           } else None
-        }
-        if (idx < Int.MaxValue && idx >= 0L)  go(idx.toInt, fa.toIterator) else None
+        if (idx < Int.MaxValue && idx >= 0L) go(idx.toInt, fa.toIterator) else None
       }
 
       override def size[A](fa: Set[A]): Long = fa.size.toLong

alleycats-core/src/main/scala/alleycats/std/try.scala

@@ -42,7 +42,8 @@ object TryInstances {
       def coflatMap[A, B](fa: Try[A])(f: Try[A] => B): Try[B] = Try(f(fa))
       def extract[A](p: Try[A]): A = p.get
 
-      def tailRecM[A, B](a: A)(f: (A) => Try[Either[A, B]]): Try[B] = cats.instances.try_.catsStdInstancesForTry.tailRecM(a)(f)
+      def tailRecM[A, B](a: A)(f: (A) => Try[Either[A, B]]): Try[B] =
+        cats.instances.try_.catsStdInstancesForTry.tailRecM(a)(f)
     }
 }
 

alleycats-core/src/main/scala/alleycats/syntax/all.scala

@@ -1,5 +1,3 @@
 package alleycats.syntax
 
-object all
-    extends EmptySyntax
-    with FoldableSyntax
+object all extends EmptySyntax with FoldableSyntax

alleycats-core/src/main/scala/alleycats/syntax/foldable.scala

@@ -9,6 +9,8 @@ object foldable extends FoldableSyntax
 trait FoldableSyntax {
   implicit class ExtraFoldableOps[F[_]: Foldable, A](fa: F[A]) {
     def foreach(f: A => Unit): Unit =
-      fa.foldLeft(()) { (_, a) => f(a) }
+      fa.foldLeft(()) { (_, a) =>
+        f(a)
+      }
   }
 }

alleycats-laws/src/main/scala/alleycats/laws/discipline/FlatMapRecTests.scala

@@ -7,20 +7,18 @@ import org.scalacheck.Arbitrary
 import org.scalacheck.Prop._
 import org.typelevel.discipline.Laws
 
-
 trait FlatMapRecTests[F[_]] extends Laws {
   def laws: FlatMapLaws[F]
 
   def tailRecM[A: Arbitrary](implicit
                              ArbFA: Arbitrary[F[A]],
                              ArbAFA: Arbitrary[A => F[A]],
-                             EqFA: Eq[F[A]]
-                            ): RuleSet = {
+                             EqFA: Eq[F[A]]): RuleSet =
     new DefaultRuleSet(
       name = "flatMapTailRec",
       parent = None,
-      "tailRecM consistent flatMap" -> forAll(laws.tailRecMConsistentFlatMap[A] _))
-  }
+      "tailRecM consistent flatMap" -> forAll(laws.tailRecMConsistentFlatMap[A] _)
+    )
 }
 
 object FlatMapRecTests {

alleycats-tests/src/test/scala/alleycats/tests/AlleycatsSuite.scala

@@ -1,7 +1,6 @@
 package alleycats
 package tests
 
-
 import alleycats.std.MapInstances
 import catalysts.Platform
 import cats._
@@ -25,7 +24,8 @@ trait TestSettings extends Configuration with Matchers {
       maxDiscardedFactor = if (Platform.isJvm) PosZDouble(5.0) else PosZDouble(50.0),
       minSize = PosZInt(0),
       sizeRange = if (Platform.isJvm) PosZInt(10) else PosZInt(5),
-      workers = PosInt(1))
+      workers = PosInt(1)
+    )
 
   lazy val slowCheckConfiguration: PropertyCheckConfiguration =
     if (Platform.isJvm) checkConfiguration
@@ -36,7 +36,17 @@ trait TestSettings extends Configuration with Matchers {
  * An opinionated stack of traits to improve consistency and reduce
  * boilerplate in Alleycats tests. Derived from Cats.
  */
-trait AlleycatsSuite extends FunSuite with Matchers with GeneratorDrivenPropertyChecks with Discipline with TestSettings with AllInstances with AllSyntax with TestInstances with StrictCatsEquality with MapInstances {
+trait AlleycatsSuite
+    extends FunSuite
+    with Matchers
+    with GeneratorDrivenPropertyChecks
+    with Discipline
+    with TestSettings
+    with AllInstances
+    with AllSyntax
+    with TestInstances
+    with StrictCatsEquality
+    with MapInstances {
   implicit override val generatorDrivenConfig: PropertyCheckConfiguration =
     checkConfiguration
 
@@ -48,7 +58,5 @@ trait AlleycatsSuite extends FunSuite with Matchers with GeneratorDrivenProperty
 sealed trait TestInstances {
   // To be replaced by https://github.com/rickynils/scalacheck/pull/170
   implicit def arbitraryTry[A: Arbitrary]: Arbitrary[Try[A]] =
-    Arbitrary(Gen.oneOf(
-      arbitrary[A].map(Success(_)),
-      arbitrary[Throwable].map(Failure(_))))
+    Arbitrary(Gen.oneOf(arbitrary[A].map(Success(_)), arbitrary[Throwable].map(Failure(_))))
 }

alleycats-tests/src/test/scala/alleycats/tests/IterableTests.scala

@@ -6,18 +6,20 @@ import alleycats.std.all._
 
 class IterableTests extends AlleycatsSuite {
 
-  test("foldLeft sum == sum"){
+  test("foldLeft sum == sum") {
     val it = Iterable(1, 2, 3)
-    Foldable[Iterable].foldLeft(it, 0){
+    Foldable[Iterable].foldLeft(it, 0) {
       case (b, a) => a + b
-    } shouldEqual(it.sum)
+    } shouldEqual (it.sum)
   }
 
-  test("foldRight early termination"){
-      Foldable[Iterable].foldRight(Iterable(1, 2, 3), Eval.now("KO")){
+  test("foldRight early termination") {
+    Foldable[Iterable]
+      .foldRight(Iterable(1, 2, 3), Eval.now("KO")) {
         case (2, _) => Eval.now("OK")
         case (a, b) => b
-      }.value shouldEqual(Eval.now("OK").value)
-    }
+      }
+      .value shouldEqual (Eval.now("OK").value)
+  }
 
 }

alleycats-tests/src/test/scala/alleycats/tests/SetSuite.scala

@@ -11,6 +11,3 @@ class SetSuite extends AlleycatsSuite {
 
   checkAll("Foldable[Set]", SerializableTests.serializable(Foldable[Set]))
 }
-
-
-