Run the experimental rules by default

There is no need for a separate build task to run the experimental rules. The
experimental rules can be executed by default in the "ktlint" task. Also, the
baseline has been fixed so there is no longer a need to use extension "_kt"
for the baseline test files.

Closes pinterest#1222

build.gradle

@@ -42,17 +42,12 @@ dependencies {
 }
 
 task ktlint(type: JavaExec, group: LifecycleBasePlugin.VERIFICATION_GROUP) {
-  description = "Check Kotlin code style."
+  description = "Check Kotlin code style including experimental rules."
   classpath = configurations.ktlint
   main = 'com.pinterest.ktlint.Main'
-  args '**/src/**/*.kt', '--baseline=ktlint-baseline.xml', '--verbose'
-}
-
-task ktlint_experimental(type: JavaExec, group: LifecycleBasePlugin.VERIFICATION_GROUP) {
-  description = "Check Kotlin code style with experimental rules."
-  classpath = configurations.ktlint
-  main = 'com.pinterest.ktlint.Main'
-  args '**/src/**/*.kt', '--verbose', '--experimental'
+  // Experimental rules run by default run on the ktlint code base itself. Experimental rules should not be released if
+  // we are not pleased ourselves with the results on the ktlint code base.
+  args '**/src/**/*.kt', '--baseline=ktlint/src/test/resources/ktlint-test-baseline.xml', '--experimental', '--verbose'
 }
 
 /**

ktlint/src/test/resources/ktlint-test-baseline.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<baseline version="1.0">
+	<file name="ktlint/src/test/resources/TestBaselineExtraErrorFile.kt">
+		<error line="3" column="34" source="no-empty-class-body" />
+		<error line="4" column="1" source="no-blank-line-before-rbrace" />
+	</file>
+	<file name="ktlint/src/test/resources/TestBaselineFile.kt">
+		<error line="3" column="24" source="no-empty-class-body" />
+		<error line="4" column="1" source="no-blank-line-before-rbrace" />
+	</file>
+</baseline>