Add noFailOnViolated option for SpotlessConfig

If this option is set `true`, a Spotless task won't fail even if the task
detects any format violation.

Author: moznion

plugin/src/main/scala-sbt-0.13/net/moznion/sbt/SbtSpotless.scala

@@ -147,9 +147,12 @@ object SbtSpotless extends AutoPlugin {
           .reduce((acc, taskResult) => acc && taskResult)
 
         if (!succeeded) {
-          throw new MessageOnlyException(
-            s"Failed to run $taskName, please refer to the above logs."
-          )
+          if (!config.noFailOnViolated) {
+            throw new MessageOnlyException(
+              s"Failed to run $taskName, please refer to the above logs."
+            )
+          }
+          logger.info(s"Some violations occur on $taskName, please refer to the above logs. `noFailOnViolated` is set true, so the task doesn't fail.")
         }
       }
   }

plugin/src/main/scala-sbt-1.0/net/moznion/sbt/SbtSpotless.scala

@@ -157,8 +157,13 @@ object SbtSpotless extends AutoPlugin {
           .reduce((acc, taskResult) => acc && taskResult)
 
         if (!succeeded) {
-          throw new MessageOnlyException(
-            s"Failed to run $taskName, please refer to the above logs."
+          if (!config.noFailOnViolated) {
+            throw new MessageOnlyException(
+              s"Failed to run $taskName, please refer to the above logs."
+            )
+          }
+          logger.info(
+            s"Some violations occur on $taskName, please refer to the above logs. `noFailOnViolated` is set true, so the task doesn't fail."
           )
         }
       }

plugin/src/main/scala/net/moznion/sbt/spotless/config/SpotlessConfig.scala

@@ -44,7 +44,8 @@ case class SpotlessConfig(
     paddedCellWorkingDir: Target = null,
     paddedCellDiagnoseDir: Target = null,
     checkOnCompile: Boolean = false,
-    applyOnCompile: Boolean = false
+    applyOnCompile: Boolean = false,
+    noFailOnViolated: Boolean = false
 ) {
   private[sbt] def toPathConfig(
       defaultBaseDir: File,

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/.gitignore

@@ -0,0 +1,4 @@
+src/main/java/*
+!src/main/java/.gitkeep
+src/test/java/*
+!src/test/java/.gitkeep

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/build.sbt

@@ -0,0 +1,15 @@
+import net.moznion.sbt.spotless.config._
+
+lazy val root = (project in file("."))
+  .settings(
+    version := "0.1",
+    scalaVersion := "2.12.11",
+    spotless := SpotlessConfig(
+      noFailOnViolated = true,
+      dynamicDependencyWorkingDir = file(System.getProperty("plugin.scriptedTestDepDir")),
+      dynamicDependencyCacheDir = file(System.getProperty("plugin.scriptedTestDepDir") + "/.spotless"),
+    ),
+    spotlessJava := JavaConfig(
+      googleJavaFormat = GoogleJavaFormatConfig(version = "1.7")
+    ),
+  )

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/fixtures/InvalidIndentMain.java

@@ -0,0 +1,3 @@
+public class Main {
+public void method() {}
+}

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/fixtures/InvalidIndentTest.java

@@ -0,0 +1,3 @@
+public class Test {
+public void method() {}
+}

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/fixtures/ValidIndentMain.java

@@ -0,0 +1,3 @@
+public class Main {
+  public void method() {}
+}

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/fixtures/ValidIndentTest.java

@@ -0,0 +1,3 @@
+public class Test {
+  public void method() {}
+}

plugin/src/sbt-test/sbt-spotless/noFailOnViolated/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.3.9