Scalafmt plugin implementation (#156)

* scalariform: improve logging, declare tasks final

* scalafmt plugin implementation

* add scalafmt and scalariform plugins and examples to tests

* fix logging guarded logging behaviour

* add notes about formatting check to README

* fix compilation error in examples

7 files changed, 93 insertions, 6 deletions

diff --git a/examples/scalafmt-example/README.md b/examples/scalafmt-example/README.md
new file mode 100644
index 0000000..0a59f96
--- /dev/null
+++ b/examples/scalafmt-example/README.md
@@ -0,0 +1,16 @@
+This example shows integration with scalafmt plugin.
+
+Reformat executed on every `cbt compile` call, and affects only *.scala source files.
+
+You can provide your custom scalfmt preferences in build via `scalafmtConfig`.
+
+To see formatting in action: execute `cbt breakFormatting` to break formatting and then execute`cbt scalafmt` to get formatting back.
+
+To check if your code is properly formatted(for example as part of CI validation), you can execute:
+
+```
+cbt scalafmt
+git diff --exit-code
+```
+
+Last command will return non-zero code, if your code isn't properly formatted.
diff --git a/examples/scalafmt-example/build/build.scala b/examples/scalafmt-example/build/build.scala
new file mode 100644
index 0000000..6f77108
--- /dev/null
+++ b/examples/scalafmt-example/build/build.scala
@@ -0,0 +1,29 @@
+import cbt._
+import org.scalafmt.ScalafmtStyle
+
+class Build(val context: Context) extends BuildBuild with Scalafmt {
+  override def compile = {
+    scalafmt
+    super.compile
+  }
+
+  override def scalafmtConfig: ScalafmtStyle = ScalafmtStyle.defaultWithAlign
+
+  def breakFormatting = {
+    import java.nio.file._
+    import java.nio.charset.Charset
+    import scala.collection.JavaConverters._
+    val utf8 = Charset.forName("UTF-8")
+    sourceFiles foreach { file =>
+      try {
+        val path = file.toPath
+        val fileLines = Files.readAllLines(path, utf8).asScala
+        val brokenLines = fileLines map (_.dropWhile(_ ==' '))
+        Files.write(path, brokenLines.asJava, utf8)
+      } catch {
+        case e: Exception => System.err.print(s"Error happend when breaking formatting: ${e}")
+      }
+    }
+    System.err.println("Done breaking formatting")
+  }
+}
diff --git a/examples/scalafmt-example/build/build/build.scala b/examples/scalafmt-example/build/build/build.scala
new file mode 100644
index 0000000..aa70f36
--- /dev/null
+++ b/examples/scalafmt-example/build/build/build.scala
@@ -0,0 +1,5 @@
+import cbt._
+
+class Build(val context: Context) extends BuildBuild {
+  override def dependencies = super.dependencies :+ plugins.scalafmt
+}
diff --git a/examples/scalafmt-example/resources/reference.conf b/examples/scalafmt-example/resources/reference.conf
new file mode 100644
index 0000000..f3e122d
--- /dev/null
+++ b/examples/scalafmt-example/resources/reference.conf
@@ -0,0 +1,8 @@
+// should not reformat this, cause it is not in source files
+some {
+  inside {
+    foo: 22
+    bar: false
+    baz: "hello"
+  }
+}
diff --git a/examples/scalafmt-example/src/Main.scala b/examples/scalafmt-example/src/Main.scala
new file mode 100644
index 0000000..595cede
--- /dev/null
+++ b/examples/scalafmt-example/src/Main.scala
@@ -0,0 +1,16 @@
+import scala.concurrent.{Await, Future}
+import scala.concurrent.duration._
+
+object Main extends App {
+  println("fooo")
+  val futureRes = Await.result(Future.successful(1), 5.seconds)
+  List(1, 2, 4, 5, 6) match {
+    case h :: _ => println("not empty list")
+    case Nil    => println("empty list")
+  }
+
+  List(1 -> 2, 2 -> 3, 3 -> 4) match {
+    case (1, 2) :: _   => 90 -> 1
+    case (22, 44) :: _ => 1  -> 150
+  }
+}
diff --git a/examples/scalariform-example/README.md b/examples/scalariform-example/README.md
index e599b5b..28ad226 100644
--- a/examples/scalariform-example/README.md
+++ b/examples/scalariform-example/README.md
@@ -1,5 +1,16 @@
 This example shows integration with scalariform plugin.
+
 Reformat executed on every `cbt compile` call, and affects only *.scala source files.
+
 You can provide your custom scalariform preferences in build via `scalariformPreferences`.
-To test formatting in action you can execute: `cbt breakFormatting` to break formatting
-and `cbt scalariformReformat` to get formatting back.
+
+To see formatting in action: execute `cbt breakFormatting` to break formatting and then execute `cbt scalariformFormat` to get formatting back.
+
+To check if your code is properly formatted(for example as part of CI validation), you can execute:
+
+```
+cbt scalariformFormat
+git diff --exit-code
+```
+
+Last command will return non-zero code, if your code isn't properly formatted.
diff --git a/examples/scalariform-example/build/build.scala b/examples/scalariform-example/build/build.scala
index b9caa59..5f7b7ff 100644
--- a/examples/scalariform-example/build/build.scala
+++ b/examples/scalariform-example/build/build.scala
@@ -1,7 +1,7 @@
 import cbt._
 import scalariform.formatter.preferences._
 
-class Build(val context: Context) extends BuildBuild with Scalariform {
+class Build(val context: Context) extends BaseBuild with Scalariform {
   override def compile = {
     scalariformFormat
     super.compile
@@ -13,15 +13,17 @@ class Build(val context: Context) extends BuildBuild with Scalariform {
       .setPreference(DoubleIndentClassDeclaration, true)
       .setPreference(RewriteArrowSymbols, true)
 
-  def breakFormatting = {
+  final def breakFormatting = {
     import java.nio.file._
+    import java.nio.charset.Charset
     import scala.collection.JavaConverters._
+    val utf8 = Charset.forName("UTF-8")
     sourceFiles foreach { file =>
       try {
         val path = file.toPath
-        val fileLines = Files.readAllLines(path).asScala
+        val fileLines = Files.readAllLines(path, utf8).asScala
         val brokenLines = fileLines map (_.dropWhile(_ ==' '))
-        Files.write(path, brokenLines.asJava)
+        Files.write(path, brokenLines.asJava, utf8)
       } catch {
         case e: Exception => System.err.print(s"Error happend when breaking formatting: ${e}")
       }