From 4a8d10e3ce8d6ad93317c6aee0fd6a87d2388f4c Mon Sep 17 00:00:00 2001
From: Ivan Topolnjak <ivantopo@gmail.com>
Date: Thu, 7 Feb 2019 00:18:05 +0100
Subject: shade extra dependencies and publish the shaded jar

---
 build.sbt           | 38 +++++++++++++++++++++++++++++++++++---
 project/plugins.sbt |  3 ++-
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/build.sbt b/build.sbt
index b5b06ee5..5bd86895 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,3 +1,6 @@
+import scala.xml.Node
+import scala.xml.transform.{RewriteRule, RuleTransformer}
+
 /* =========================================================================================
  * Copyright © 2013-2018 the kamon project <http://kamon.io/>
  *
@@ -42,8 +45,9 @@ val commonSettings = Seq(
 
 lazy val core = (project in file("kamon-core"))
   .enablePlugins(BuildInfoPlugin)
-  .settings(moduleName := "kamon-core")
+  .enablePlugins(AssemblyPlugin)
   .settings(commonSettings: _*)
+  .settings(moduleName := "kamon-core")
   .settings(
     buildInfoKeys := Seq[BuildInfoKey](version),
     buildInfoPackage := "kamon.status",
@@ -51,10 +55,38 @@ lazy val core = (project in file("kamon-core"))
       "com.typesafe"     %  "config"              % "1.3.1",
       "org.hdrhistogram" %  "HdrHistogram"        % "2.1.9",
       "org.jctools"      %  "jctools-core"        % "2.1.1",
-      "org.nanohttpd"    %  "nanohttpd-nanolets"  % "2.3.1",
+      "org.nanohttpd"    %  "nanohttpd"           % "2.3.1",
       "com.grack"        %  "nanojson"            % "1.1",
       "org.slf4j"        %  "slf4j-api"           % "1.7.25"
-    )
+    ),
+    assembleArtifact in assemblyPackageScala := false,
+    assemblyShadeRules in assembly := Seq(
+      ShadeRule.rename("org.HdrHistogram.**"    -> "kamon.lib.@0").inAll,
+      ShadeRule.rename("com.grack.nanojson.**"  -> "kamon.lib.@0").inAll,
+      ShadeRule.rename("org.jctools.**"         -> "kamon.lib.@0").inAll,
+      ShadeRule.rename("fi.iki.elonen.**"       -> "kamon.lib.@0").inAll,
+    ),
+    assemblyExcludedJars in assembly := {
+      val cp = (fullClasspath in assembly).value
+      val excludedPackages = Seq("slf4j-api","config")
+      cp filter { file => excludedPackages.exists(file.data.getName.startsWith(_))}
+    },
+    packageBin in Compile := assembly.value,
+    assemblyJarName in assembly := s"${moduleName.value}_${scalaBinaryVersion.value}-${version.value}.jar",
+    pomPostProcess := { originalPom => {
+      val shadedGroups = Seq("org.hdrhistogram", "org.jctools", "org.nanohttpd", "com.grack")
+      val filterShadedDependencies = new RuleTransformer(new RewriteRule {
+        override def transform(n: Node): Seq[Node] = {
+          if(n.label == "dependency") {
+            val group = (n \ "groupId").text
+            if (shadedGroups.find(eo => eo.equalsIgnoreCase(group)).nonEmpty) Seq.empty else n
+          } else n
+        }
+      })
+
+      filterShadedDependencies(originalPom)
+    }}
+
   )
 
 lazy val testkit = (project in file("kamon-testkit"))
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 9e8819fa..d9c70803 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,3 +1,4 @@
 lazy val root: Project = project in file(".") dependsOn(RootProject(uri("git://github.com/kamon-io/kamon-sbt-umbrella.git")))
 
-addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.9.0")
\ No newline at end of file
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.9.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.9")
\ No newline at end of file
-- 
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