From 306db4d78873e571827f40625496cdc7098864ce Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Wed, 19 Apr 2017 20:23:40 -0400
Subject: [PATCH] Check for git diff at Travis CI

---
 .travis.yml | 2 +-
 build.sbt   | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index c39d887fa..59cb0e286 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ matrix:
 
 env:
   matrix:
-    - SBT_CMD=";test:compile;scalariformCheck"
+    - SBT_CMD=";test:compile;scalafmtCheck"
     - SBT_CMD="mimaReportBinaryIssues"
     - SBT_CMD="safeUnitTests"
     - SBT_CMD="otherUnitTests"
diff --git a/build.sbt b/build.sbt
index 9e29538bf..61a2df4f9 100644
--- a/build.sbt
+++ b/build.sbt
@@ -361,6 +361,13 @@ def customCommands: Seq[Setting[_]] = Seq(
   otherUnitTests := {
     test.all(otherProjects).value
   },
+  commands += Command.command("scalafmtCheck") { state =>
+    sys.process.Process("git diff --name-only --exit-code").! match {
+      case 0 => // ok
+      case x => sys.error("git diff detected! Did you compile before committing?")
+    }
+    state
+  },
   commands += Command.command("release-sbt-local") { state =>
     "clean" ::
     "so compile" ::