Add support for git dependencies

pair coded with @chavxo

1 files changed, 49 insertions, 0 deletions

diff --git a/stage2/GitDependency.scala b/stage2/GitDependency.scala
new file mode 100644
index 0000000..c3e38b6
--- /dev/null
+++ b/stage2/GitDependency.scala
@@ -0,0 +1,49 @@
+package cbt
+import java.io._
+import java.net._
+import scala.collection.immutable.Seq
+import org.eclipse.jgit.api._
+import org.eclipse.jgit.lib.Ref
+
+case class GitDependency(
+  url: String, ref: String // example: git://github.com/cvogt/cbt.git#<some-hash>
+)(implicit val logger: Logger) extends Dependency{
+  override def lib = new Lib(logger)
+
+  // TODO: add support for authentication via ssh and/or https
+  // See http://www.codeaffine.com/2014/12/09/jgit-authentication/
+
+  private val GitUrl = "(git|https)://([^/]+)/(.+)".r
+  private val GitUrl( _, domain, path ) = url
+  
+  private object dependenciesCache extends Cache[Seq[Dependency]]
+  def dependencies = dependenciesCache{
+    val checkoutDirectory = paths.cbtHome ++ s"/cache/git/$domain/$path/$ref"
+    if(checkoutDirectory.exists){
+      logger.git(s"Found existing checkout of $url#$ref in $checkoutDirectory")
+    } else {
+
+      logger.git(s"Cloning $url into $checkoutDirectory")
+      val git =
+        Git.cloneRepository()
+          .setURI(url)
+          .setDirectory(checkoutDirectory)
+          .call()
+      
+      logger.git(s"Checking out ref $ref")
+      git.checkout()
+          .setName(ref)
+          .call()
+
+    }
+    val managedBuild = lib.loadDynamic(
+      Context( cwd = checkoutDirectory, args = Seq(), logger )
+    )    
+    Seq( managedBuild )
+  }
+
+  def exportedClasspath = ClassPath(Seq())
+  def exportedJars = Seq()
+  private[cbt] def targetClasspath = exportedClasspath
+  def updated: Boolean = false
+}