From dd36f97a82746cec0b25b94651581fe799e24579 Mon Sep 17 00:00:00 2001
From: Jiuyang Liu
Date: Mon, 10 Jan 2022 10:37:17 -0800
Subject: Add scalafmt config, SBT plugin, and mill support

Can be run in two ways:
* sbt scalaFmtAll
* mill mill.scalalib.scalafmt.ScalafmtModule/reformatAll __.sources
---
 .scalafmt.conf      | 26 ++++++++++++++++++++++++++
 build.sc            |  3 ++-
 project/plugins.sbt |  2 ++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 .scalafmt.conf

diff --git a/.scalafmt.conf b/.scalafmt.conf
new file mode 100644
index 00000000..f74e5504
--- /dev/null
+++ b/.scalafmt.conf
@@ -0,0 +1,26 @@
+version = 2.6.4
+
+maxColumn = 120
+align = most
+continuationIndent.defnSite = 2
+assumeStandardLibraryStripMargin = true
+docstrings = ScalaDoc
+lineEndings = preserve
+includeCurlyBraceInSelectChains = false
+danglingParentheses = true
+
+align.tokens.add = [
+  {
+    code = ":"
+  }
+]
+
+newlines.alwaysBeforeCurlyBraceLambdaParams = false
+newlines.alwaysBeforeMultilineDef = false
+newlines.implicitParamListModifierForce = [before]
+
+verticalMultiline.atDefnSite = true
+
+optIn.annotationNewlines = true
+
+rewrite.rules = [SortImports, PreferCurlyFors, AvoidInfix]
diff --git a/build.sc b/build.sc
index 1bf17ae3..1e665a9f 100644
--- a/build.sc
+++ b/build.sc
@@ -1,6 +1,7 @@
 import mill._
 import mill.scalalib._
 import mill.scalalib.publish._
+import mill.scalalib.scalafmt._
 import coursier.maven.MavenRepository
 import $ivy.`com.lihaoyi::mill-contrib-buildinfo:$MILL_VERSION`
 import mill.contrib.buildinfo.BuildInfo
@@ -29,7 +30,7 @@ def getTestVersion(dep: String, org: String = "edu.berkeley.cs") = {
 }
 
 // Since chisel contains submodule core and macros, a CommonModule is needed
-trait CommonModule extends CrossSbtModule with PublishModule {
+trait CommonModule extends CrossSbtModule with PublishModule with ScalafmtModule {
   def firrtlModule: Option[PublishModule] = None
 
   def firrtlIvyDeps = if (firrtlModule.isEmpty) Agg(
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 8c19290c..f09e1a1b 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -24,5 +24,7 @@ addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.0.1")
 
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")
 
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
+
 // From FIRRTL for building from source
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.33")
-- 
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