Add scalafmt (close #112)

.scalafmt.conf

@@ -0,0 +1,23 @@
+version = "2.6.1"
+style = default
+align.preset = none
+align.openParenCallSite = true
+align.arrowEnumeratorGenerator = true
+maxColumn = 140
+docstrings = JavaDoc
+optIn.breakChainOnFirstMethodDot = true
+spaces.afterKeywordBeforeParen = true
+continuationIndent.callSite = 2
+continuationIndent.defnSite = 2
+verticalMultiline.atDefnSite = true
+verticalMultiline.arityThreshold = 3
+verticalMultiline.newlineAfterOpenParen = true
+verticalMultiline.newlineBeforeImplicitKW = true
+verticalMultiline.excludeDanglingParens = []
+importSelectors = noBinPack
+rewrite.rules = [
+  AsciiSortImports,
+  RedundantBraces,
+  RedundantParens,
+  PreferCurlyFors
+]

build.sbt

@@ -27,6 +27,7 @@ lazy val root = project.in(file("."))
   .settings(BuildSettings.mimaSettings)
   .settings(BuildSettings.scoverageSettings)
   .settings(BuildSettings.sbtSiteSettings)
+  .settings(BuildSettings.formattingSettings)
   .settings(Seq(
     shellPrompt := { _ => name.value + " > " }
   ))

project/BuildSettings.scala

@@ -31,6 +31,8 @@ import com.typesafe.sbt.site.SiteScaladocPlugin.autoImport._
 import com.typesafe.sbt.SbtGit.GitKeys.{gitBranch, gitRemoteRepo}
 import com.typesafe.sbt.site.preprocess.PreprocessPlugin.autoImport._
 
+import org.scalafmt.sbt.ScalafmtPlugin.autoImport._
+
 object BuildSettings {
 
   // Basic settings for our app
@@ -100,4 +102,9 @@ object BuildSettings {
     siteSubdirName in SiteScaladoc := s"${version.value}",
     preprocessVars in Preprocess := Map("VERSION" -> version.value)
   )
+
+  lazy val formattingSettings = Seq(
+    scalafmtConfig    := file(".scalafmt.conf"),
+    scalafmtOnCompile := false
+  )
 }

project/plugins.sbt

@@ -5,3 +5,4 @@ addSbtPlugin("com.typesafe.sbt" % "sbt-site" % "1.4.0")
 addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.0")
 addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.2")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.0")

src/main/scala/com.snowplowanalytics.snowplow.analytics.scalasdk/Data.scala

@@ -20,8 +20,8 @@ import com.snowplowanalytics.iglu.core.SchemaKey
 object Data {
 
   /**
-    * The type (contexts/derived_contexts/unstruct_event) and Iglu URI of a shredded type
-    */
+   * The type (contexts/derived_contexts/unstruct_event) and Iglu URI of a shredded type
+   */
   case class ShreddedType(shredProperty: ShredProperty, schemaKey: SchemaKey)
 
   /**
@@ -43,6 +43,7 @@ object Data {
    * Field types of enriched event that can be shredded (self-describing JSONs)
    */
   sealed trait ShredProperty {
+
     /**
      * Canonical field name
      */