Add scalafmt configuration

.scalafmt.conf

@@ -0,0 +1,9 @@
+continuationIndent.defnSite = 2
+docstrings = JavaDoc
+includeCurlyBraceInSelectChains = false
+maxColumn = 120
+newlines.alwaysBeforeElseAfterCurlyIf = false
+newlines.alwaysBeforeMultilineDef = false
+optIn.breakChainOnFirstMethodDot = false
+spaces.inImportCurlyBraces = true
+

build.sbt

@@ -561,14 +561,16 @@ lazy val CompileTime = config("compile-time")
 val jvmTestProjects = jvmProjects.filterNot(Set(core, jawn, parser))
 val jsTestProjects = jsProjects.filterNot(Set(core, parser, scalajs))
 
+val formatCommands = ";scalafmtCheck;test:scalafmtCheck;scalafmtSbtCheck;scalastyle"
+
 addCommandAlias("buildJVM", jvmProjects.map(";" + _.id + "/compile").mkString)
 addCommandAlias(
   "validateJVM",
-  ";buildJVM" + jvmTestProjects.map(";" + _.id + "/test").mkString + ";scalastyle"
+  ";buildJVM" + jvmTestProjects.map(";" + _.id + "/test").mkString + formatCommands
 )
 addCommandAlias("buildJS", jsProjects.map(";" + _.id + "/compile").mkString)
 addCommandAlias(
   "validateJS",
-  ";buildJS" + jsTestProjects.map(";" + _.id + "/test").mkString + ";scalastyle"
+  ";buildJS" + jsTestProjects.map(";" + _.id + "/test").mkString + formatCommands
 )
 addCommandAlias("validate", ";validateJVM;validateJS")

project/plugins.sbt

@@ -2,6 +2,7 @@ addSbtCoursier
 addSbtPlugin("com.47deg" % "sbt-microsites" % "0.7.24")
 addSbtPlugin("com.dwijnand" % "sbt-travisci" % "1.1.3")
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.2")
+addSbtPlugin("com.geirsson" % "sbt-scalafmt" % "1.6.0-RC4")
 addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.10")
 addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.2")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.3.0")