SCALA-455 Add code for scalafix article

Author: Matteo Di Pirro

scala-sbt/scalafix/.scalafix.conf

@@ -0,0 +1,8 @@
+rules = [
+  DisableSyntax,
+  RemoveUnused,
+]
+
+DisableSyntax.noVars = true
+DisableSyntax.noThrows = true
+DisableSyntax.noNulls = true

scala-sbt/scalafix/build.sbt

@@ -0,0 +1,9 @@
+lazy val root = (project in file("."))
+  .settings(
+    name := "scalafix",
+    scalaVersion := "3.4.2",
+    version := "1.0.0",
+    semanticdbEnabled := true,
+    semanticdbVersion := scalafixSemanticdb.revision,
+    scalacOptions += "-Wunused:all"
+  )

scala-sbt/scalafix/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.10.0

scala-sbt/scalafix/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.12.1")

scala-sbt/scalafix/src/main/scala/com/baeldung/scala/scalafix/DisableSyntaxDemo.scala

@@ -0,0 +1,15 @@
+package com.baeldung.scala.scalafix
+
+object DisableSyntaxDemo:
+  var myVariable = null
+
+  def validateMyVariable(): Boolean =
+    if (myVariable == null) throw Exception("myVariable Is Null")
+
+    return true
+
+object DisableSyntaxDemoRewritten:
+  val myVariable = Option.empty[Unit]
+
+  def validateMyVariable(): Either[String, Unit] =
+    myVariable.toRight("myVariable Is Null")

scala-sbt/scalafix/src/main/scala/com/baeldung/scala/scalafix/RemoveUnusedDemo.scala

@@ -0,0 +1,21 @@
+package com.baeldung.scala.scalafix
+
+import scala.List
+
+object RemoveUnusedDemo:
+  val myNumber = 10
+
+  def greeting(name: String): String = {
+    val newName = s"$name $myNumber"
+    s"Hello, $name!"
+  }
+
+/* Rewritten:
+object RemoveUnusedDemo:
+  val myNumber = 10
+
+  def greeting(name: String): String = {
+    s"$name $myNumber"
+    s"Hello, $name!"
+  }
+ */