How could I convert a pom xml to sbt dependencies? - sbt

Question

I have some projects that have all the dependencies stored inside pom.xml files.
How could I retrieve the dependencies from inside so I could easily place them to a project that uses sbt?
Copy pasting all of them is just time consuming..

Answer 1

This scala script, which runs from command line, takes care of that, converting the pom.xml file to sbt dependencies printed on screen. Then you only need to copy paste once for each pom.xml file.
Note: the pom.xml must be in the same folder as the script. Then from command line you execute: scala scriptname.scala
import scala.xml._
(XML.load("pom.xml") \\ "dependencies") \ "dependency" foreach ((dependency: Node) => {
val groupId = (dependency \ "groupId").text
val artifactId = (dependency \ "artifactId").text
val version = (dependency \ "version").text
val scope = (dependency \ "scope").text
val classifier = (dependency \ "classifier").text
val artifactValName: String = artifactId.replaceAll("[-\\.]", "_")
print("val %s = \"%s\" %% \"%s\" %% \"%s\"".format(artifactValName, groupId, artifactId, version))
scope match {
case "" => print("\n")
case _ => print(" %% \"%s\"\n".format(scope))
}
None
});

Answer 2

I've enhanced George Pligor's answer (and fixed a few bugs) so a complete build.sbt file is created that incorporates the dependencies from pom.xml. To convert a Maven pom.xml to build.sbt:
Place this code into a file called PomToSbt.scala next to pom.xml
Type scala PomToSbt.scala > build.sbt
The dependencies from pom.xml will be extracted and placed into a complete build.sbt file.
Here is the code:
import scala.xml._
val lines = (XML.load("pom.xml") \\ "dependencies") \ "dependency" map { dependency =>
val groupId = (dependency \ "groupId").text
val artifactId = (dependency \ "artifactId").text
val version = (dependency \ "version").text
val scope = (dependency \ "scope").text
val classifier = (dependency \ "classifier").text
val artifactValName: String = artifactId.replaceAll("[-\\.]", "_")
val scope2 = scope match {
case "" => ""
case _ => s""" % "$scope""""
}
s""" "$groupId" %% "$artifactId" % "$version"$scope2"""
}
val buildSbt = io.Source.fromURL("https://raw.githubusercontent.com/mslinn/sbtTemplate/master/build.sbt").mkString
val libText = "libraryDependencies ++= Seq("
val buildSbt2 = buildSbt.replace(libText, libText + lines.mkString("\n", ",\n", ""))
println(buildSbt2)
I made a gist; if any updates are required I will make them there.

Answer 3

Mike, here's the code that works with Scala 11 at least:
import scala.xml._
//build.sbt file
val lines = (XML.load("pom.xml") \\ "dependencies") \ "dependency" map { dependency =>
val groupId = (dependency \ "groupId").text
val artifactId = (dependency \ "artifactId").text
val version = (dependency \ "version").text
val scope = (dependency \ "scope").text
val classifier = (dependency \ "classifier").text
val artifactValName: String = artifactId.replaceAll("[-\\.]", "_")
val scope2 = scope match {
case "" => ""
case _ => s""" % "$scope""""
}
s""" "$groupId" %% "$artifactId" % "$version"$scope2"""
}
val buildSbt: String = io.Source.fromURL("https://raw.githubusercontent.com/mslinn/sbtTemplate/master/build.sbt").mkString
val libText = "libraryDependencies ++= Seq\\("
val buildSbt2 = buildSbt.replaceFirst(libText, libText + lines.mkString("\n", ",\n", ""))
println(buildSbt2)

Answer 4

This blog entry explains one possible way. There's a comment pointing to a plugin that handles more complex cases.

Answer 5

import scala.xml._
// To convert a Maven pom.xml to build.sbt:
// 1) Place this code into a file called PomToSbt.scala next to pom.xml
// 2) Type scala PomtoSbt.scala > build.sbt
// The dependencies from pom.xml will be extracted and place into a complete build.sbt file
// Because most pom.xml files only refernence non-Scala dependencies, I did not use %%
val lines = (XML.load("pom.xml") \\ "dependencies") \ "dependency" map { dependency =>
val groupId = (dependency \ "groupId").text
val artifactId = (dependency \ "artifactId").text
val version = (dependency \ "version").text
val scope = (dependency \ "scope").text
val classifier = (dependency \ "classifier").text
val artifactValName: String = artifactId.replaceAll("[-\\.]", "_")
val scope2 = scope match {
case "" => ""
case _ => s""" % "$scope""""
}
s""" "$groupId" % "$artifactId" % "$version"$scope2"""
}
val buildSbt = io.Source.fromURL("https://raw.githubusercontent.com/mslinn/sbtTemplate/master/build.sbt").mkString
val libText = "libraryDependencies ++= Seq("
val buildSbt2 = buildSbt.replace(libText, libText + lines.mkString("\n", ",\n", ""))
println(buildSbt2)