Add excludeFilter support to GitBook generator

It excludes hidden files by default and thus `.git` and `.gitignore`.
The test case does not match exactly the issue described in #67 (namely
use of submodules) but instead tests a similar situation where the
source directory is the project's base directory.

Fixes #67

src/main/scala/com/typesafe/sbt/site/gitbook/GitBookPlugin.scala

@@ -26,11 +26,13 @@ object GitBookPlugin extends AutoPlugin {
     inConfig(config)(
       Seq(
         includeFilter := AllPassFilter,
+        excludeFilter := HiddenFileFilter,
         gitbookInstallDir := None,
         mappings := generate(
           sourceDirectory.value,
           target.value,
           includeFilter.value,
+          excludeFilter.value,
           gitbookInstallDir.value,
           streams.value
         ),
@@ -42,7 +44,7 @@ object GitBookPlugin extends AutoPlugin {
       SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
 
   /** Run gitbook commands. */
-  private[sbt] def generate(src: File, target: File, inc: FileFilter, installDir: Option[File], s: TaskStreams): Seq[(File, String)] = {
+  private[sbt] def generate(src: File, target: File, inc: FileFilter, exc: FileFilter, installDir: Option[File], s: TaskStreams): Seq[(File, String)] = {
     val runEnv = installDir.map("HOME" -> _.getAbsolutePath).toSeq
     def run(cmd: String*) =
       Process(cmd.toSeq, Some(src), runEnv: _*) ! s.log match {
@@ -81,9 +83,8 @@ object GitBookPlugin extends AutoPlugin {
     }
 
     // Figure out what was generated.
-    for {
-      (file, name) <- (target ** inc --- target pair relativeTo(target))
-    } yield file -> name
+    val files = (target ** inc) --- (target ** exc) --- target
+    files pair relativeTo(target)
   }
 
   private[sbt] def bookJson(src: File): File = src / "book.json"

src/sbt-test/gitbook/ignore-dot-files/.bookignore

@@ -0,0 +1,5 @@
+project/
+target/
+boot/
+global/
+*.sbt

src/sbt-test/gitbook/ignore-dot-files/.gitignore

@@ -0,0 +1 @@
+_book

src/sbt-test/gitbook/ignore-dot-files/README.md

@@ -0,0 +1,12 @@
+# Hello, GitBook!
+
+The SBT site plugin can build your http://gitbook.com[GitBook] documentation.
+
+## First Section
+
+ - item 1
+ - item 2
+
+```scala
+case class User(name: String, age: Int)
+```

src/sbt-test/gitbook/ignore-dot-files/SUMMARY.md

@@ -0,0 +1 @@
+# Summary

src/sbt-test/gitbook/ignore-dot-files/book.json

@@ -0,0 +1,3 @@
+{
+  "gitbook": "3.x.x"
+}  

src/sbt-test/gitbook/ignore-dot-files/build.sbt

@@ -0,0 +1,30 @@
+name := "test"
+
+enablePlugins(GitBookPlugin)
+
+sourceDirectory in GitBook := baseDirectory.value
+siteSubdirName in GitBook := "docs"
+
+val gitHeadPath = ".git/HEAD"
+
+initialize := {
+  // Create .git test file before running makeSite
+  IO.write(baseDirectory.value / gitHeadPath, "test")
+}
+
+TaskKey[Unit]("checkContent") := {
+  val dest = (target in makeSite).value / (siteSubdirName in GitBook).value
+
+  val generatedGitFile = baseDirectory.value / gitHeadPath
+  assert(generatedGitFile.exists, s"${generatedGitFile.getAbsolutePath} did not exist")
+
+  for (path <- Seq("index.html")) {
+    val file = dest / path
+    assert(file.exists, s"${file.getAbsolutePath} did not exist")
+  }
+
+  for (path <- Seq(gitHeadPath, ".gitignore", ".bookignore", "target", "project")) {
+    val file = dest / path
+    assert(!file.exists, s"${file.getAbsolutePath} should not exist")
+  }
+}

src/sbt-test/gitbook/ignore-dot-files/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.typesafe.sbt" % "sbt-site" % sys.props("project.version"))

src/sbt-test/gitbook/ignore-dot-files/test

@@ -0,0 +1,2 @@
+> make-site
+> checkContent