Convert your pom xml to build sbt

Jan 15, 2022 · 2 min read

Aren't you at your limits dealing with XML? If so why still bother using a build tool that still uses an outdated format like the XML? Why use Maven when you can be friends with sbt? Here is a small script that helps you to convert your pom.xml to a build.sbt. The generated build.sbt is rusty, and you need to adapt it after it is converted.

 1#!/bin/sh
 2exec /opt/softwares/scala-2.12.2/bin/scala "$0" "$@"
 3!#
 4
 5/***
 6scalaVersion := "2.12.2"
 7
 8libraryDependencies ++= Seq(
 9  "org.scala-lang.modules" %% "scala-xml" % "2.0.0"
10)
11*/
12
13import scala.xml._
14
15val lines = (XML.load("pom.xml") \\ "dependencies") \ "dependency" map { dependency =>
16  val groupId = (dependency \ "groupId").text
17  val artifactId = (dependency \ "artifactId").text
18  val version = (dependency \ "version").text
19  val scope = (dependency \ "scope").text
20  val classifier = (dependency \ "classifier").text
21  val artifactValName: String = artifactId.replaceAll("[-\\.]", "_")
22
23  val scope2 = scope match {
24    case "" => ""
25    case _ => s""" % "$scope""""
26  }
27
28  s"""  "$groupId" %  "$artifactId" % "$version"$scope2"""
29}
30
31val buildSbt = io.Source.fromURL("https://gist.githubusercontent.com/joesan/59d36606f0529af148000d54202eb370/raw/f854aa443686051637068667401d1e9a412ad192/build.sbt").mkString
32val libText = "libraryDependencies ++= Seq("
33val buildSbt2 = buildSbt.replace(libText, libText + lines.mkString("\n", ",\n", ""))

Save this file as convert.sh in the same location where your pom.xml is located

Calling it is pretty simple!

1./convert.sh > build.sbt

One thing that is worth mentioning that XML support for Scala was dropped with Scala versions 2.13 and up, so to be able to run this script, you need to have Scala 2.12 installed. I have Scala 2.12.2 in my path, and you can see that in this line here:

1exec /opt/softwares/scala-2.12.2/bin/scala "$0" "$@"

For now ignore the two parameters, "$0" "$@" as they are there if you need to pass parameters from outside. So there you have it. Instant conversion of pom.xml to build.sbt. If you need to pass in additional parameters, use these placeholders to inject them into the Scala code.