Prevent tags to be split in generated Ivy XML

build.sbt

@@ -219,7 +219,10 @@ lazy val doc = project
 
 lazy val `sbt-coursier` = project
   .dependsOn(coreJvm, cache, extra)
-  .settings(plugin)
+  .settings(
+    plugin,
+    utest
+  )
 
 lazy val `sbt-pgp-coursier` = project
   .dependsOn(`sbt-coursier`)

sbt-coursier/src/main/scala/coursier/IvyXml.scala

@@ -10,6 +10,23 @@ import SbtCompatibility._
 
 object IvyXml {
 
+  def rawContent(
+    currentProject: Project,
+    shadedConfigOpt: Option[(String, String)]
+  ): String = {
+
+    // Important: width = Int.MaxValue, so that no tag gets truncated.
+    // In particular, that prevents things like <foo /> to be split to
+    // <foo>
+    // </foo>
+    // by the pretty-printer.
+    // See https://github.com/sbt/sbt/issues/3412.
+    val printer = new scala.xml.PrettyPrinter(Int.MaxValue, 2)
+
+    """<?xml version="1.0" encoding="UTF-8"?>""" + '\n' +
+      printer.format(content(currentProject, shadedConfigOpt.map(_._2)))
+  }
+
   // These are required for publish to be fine, later on.
   def writeFiles(
     currentProject: Project,
@@ -32,10 +49,7 @@ object IvyXml {
     val cacheIvyFile = ivyCacheManager.getResolvedIvyFileInCache(ivyModule)
     val cacheIvyPropertiesFile = ivyCacheManager.getResolvedIvyPropertiesInCache(ivyModule)
 
-    val printer = new scala.xml.PrettyPrinter(80, 2)
-
-    val content0 = """<?xml version="1.0" encoding="UTF-8"?>""" + '\n' +
-      printer.format(content(currentProject, shadedConfigOpt.map(_._2)))
+    val content0 = rawContent(currentProject, shadedConfigOpt)
     cacheIvyFile.getParentFile.mkdirs()
     log.info(s"Writing Ivy file $cacheIvyFile")
     FileUtil.write(cacheIvyFile, content0.getBytes("UTF-8"))

sbt-coursier/src/test/scala/coursier/IvyXmlTests.scala

@@ -0,0 +1,35 @@
+package coursier
+
+import utest._
+
+object IvyXmlTests extends TestSuite {
+
+  val tests = TestSuite {
+    "no truncation" - {
+
+      val project = Project(
+        Module("org", "name"),
+        "ver",
+        Nil,
+        Map(
+          "foo" -> (1 to 80).map("bar" + _) // long list of configurations -> no truncation any way
+        ),
+        None,
+        Nil,
+        Nil,
+        Nil,
+        None,
+        None,
+        None,
+        None,
+        Nil,
+        Info.empty
+      )
+
+      val content = IvyXml.rawContent(project, None)
+
+      assert(!content.contains("</conf>"))
+    }
+  }
+
+}