[base-2] Correctly render the doc-root-content subheader

Author: rayrobdod

build.sbt

@@ -36,7 +36,7 @@ lazy val sharedSettings = Seq(
 		case "2.12" | "2.13" => Seq(
 			"-doc-title", name.value,
 			"-doc-version", (if ("-SNAPSHOT" == version.value) {"SNAPSHOT"} else {version.value}),
-			"-doc-root-content", ((Compile / scalaSource).value / "rootdoc.md").toString,
+			"-doc-root-content", ((Compile / docRootContentToWikidoc).value).toString,
 			"-doc-source-url", s"https://github.com/${githubId}/tree/${if (version.value.endsWith("-SNAPSHOT")) {git.gitHeadCommit.value.get} else {version.value}}€{FILE_PATH}.scala",
 			"-implicits",
 			"-groups",

project/DocRootContentToWikidoc.scala

@@ -0,0 +1,56 @@
+package name.rayrobdod.stringContextParserCombinator.build
+
+import sbt._
+import sbt.Keys._
+
+object DocRootContentToWikidoc extends AutoPlugin {
+	override def requires = sbt.plugins.JvmPlugin
+	override def trigger = allRequirements
+
+	object autoImport {
+		val markdownSource = settingKey[File]("")
+		val docRootContentToWikidoc = taskKey[File]("Convert the doc-root-content file from scala-3's markdown to scala-2's wikidoc")
+	}
+	import autoImport._
+
+	override val globalSettings = Seq(
+	)
+
+	private def unscopedSettings = Seq(
+	)
+
+	object HeaderLine {
+		def unapply(s:String): Option[(String, Int)] = {
+			val (hashes, rest) = s.span(_ == '#')
+			if (hashes.size != 0 && rest.head == ' ') {
+				Some((rest.tail, hashes.size))
+			} else {
+				None
+			}
+		}
+	}
+
+	private def perScopeSettings(config:sbt.librarymanagement.Configuration) = Seq(
+		config / docRootContentToWikidoc / target := (target.value / s"${config.name}-rootdoc.wikidoc"),
+		config / docRootContentToWikidoc / markdownSource := ((config / scalaSource).value / "rootdoc.md"),
+		config / docRootContentToWikidoc := {
+			val in = (config / docRootContentToWikidoc / markdownSource).value
+			val out = (config / docRootContentToWikidoc / target).value
+
+			if (in.exists()) {
+				sbt.io.IO.writeLines(
+					out,
+					sbt.io.IO.readLines(in)	.map{(line) => line match {
+						case HeaderLine(title, level) => s"${"=" * level} $title ${"=" * level}"
+						case other => other
+					}}
+				)
+			} else {
+				sbt.io.IO.delete(out)
+			}
+			out
+		},
+	)
+
+	override lazy val projectSettings = unscopedSettings ++ perScopeSettings(Compile) ++ perScopeSettings(Test)
+}