From 9ba4cb69331386dfde9bac69dc2d5b22401face3 Mon Sep 17 00:00:00 2001
From: Li Haoyi <haoyi.sg@gmail.com>
Date: Wed, 12 Dec 2018 16:56:02 -0800
Subject: collapse boilerplate folder structure within src/ folders (#505)

* collapse boilerplate folder structure within src/ folders

* .
---
 contrib/tut/src/TutModule.scala | 131 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 contrib/tut/src/TutModule.scala

(limited to 'contrib/tut/src/TutModule.scala')

diff --git a/contrib/tut/src/TutModule.scala b/contrib/tut/src/TutModule.scala
new file mode 100644
index 00000000..e51a8d7b
--- /dev/null
+++ b/contrib/tut/src/TutModule.scala
@@ -0,0 +1,131 @@
+package mill
+package contrib.tut
+
+import coursier.MavenRepository
+import mill.scalalib._
+import scala.util.matching.Regex
+
+/**
+  * Tut is a documentation tool which compiles and evaluates Scala code in documentation files and provides various options for configuring how the results will be displayed in the compiled documentation.
+  *
+  * Extending this trait declares a Scala module which compiles markdown, HTML and `.txt` files in the `tut` folder of the module with Tut.
+  *
+  * By default the resulting documents are simply placed in the Mill build output folder but they can be placed elsewhere by overriding the [[mill.contrib.tut.TutModule#tutTargetDirectory]] task.
+  *
+  * For example:
+  *
+  * {{{
+  * // build.sc
+  * import mill._, scalalib._, contrib.tut.__
+  *
+  * object example extends TutModule {
+  *   def scalaVersion = "2.12.6"
+  *   def tutVersion = "0.6.7"
+  * }
+  * }}}
+  *
+  * This defines a project with the following layout:
+  *
+  * {{{
+  * build.sc
+  * example/
+  *     src/
+  *     tut/
+  *     resources/
+  * }}}
+  *
+  * In order to compile documentation we can execute the `tut` task in the module:
+  *
+  * {{{
+  * sh> mill example.tut
+  * }}}
+  */
+trait TutModule extends ScalaModule {
+  /**
+    * This task determines where documentation files must be placed in order to be compiled with Tut. By default this is the `tut` folder at the root of the module.
+    */
+  def tutSourceDirectory = T.sources { millSourcePath / 'tut }
+
+  /**
+    * A task which determines where the compiled documentation files will be placed. By default this is simply the Mill build's output folder for this task,
+    * but this can be reconfigured so that documentation goes to the root of the module (e.g. `millSourcePath`) or to a dedicated folder (e.g. `millSourcePath / 'docs`)
+    */
+  def tutTargetDirectory: T[os.Path] = T { T.ctx().dest }
+
+  /**
+    * A task which determines what classpath is used when compiling documentation. By default this is configured to use the same inputs as the [[mill.contrib.tut.TutModule#runClasspath]],
+    * except for using [[mill.contrib.tut.TutModule#tutIvyDeps]] rather than the module's [[mill.contrib.tut.TutModule#runIvyDeps]].
+    */
+  def tutClasspath: T[Agg[PathRef]] = T {
+    // Same as runClasspath but with tut added to ivyDeps from the start
+    // This prevents duplicate, differently versioned copies of scala-library ending up on the classpath which can happen when resolving separately
+    transitiveLocalClasspath() ++
+    resources() ++
+    localClasspath() ++
+    unmanagedClasspath() ++
+    tutIvyDeps()
+  }
+
+  /**
+    * A task which determines the scalac plugins which will be used when compiling code examples with Tut. The default is to use the [[mill.contrib.tut.TutModule#scalacPluginIvyDeps]] for the module.
+    */
+  def tutScalacPluginIvyDeps: T[Agg[Dep]] = scalacPluginIvyDeps()
+
+  /**
+    * A [[scala.util.matching.Regex]] task which will be used to determine which files should be compiled with tut. The default pattern is as follows: `.*\.(md|markdown|txt|htm|html)`.
+    */
+  def tutNameFilter: T[Regex] = T { """.*\.(md|markdown|txt|htm|html)""".r }
+
+  /**
+    * The scalac options which will be used when compiling code examples with Tut. The default is to use the [[mill.contrib.tut.TutModule#scalacOptions]] for the module,
+    * but filtering out options which are problematic in the REPL, e.g. `-Xfatal-warnings`, `-Ywarn-unused-imports`.
+    */
+  def tutScalacOptions: T[Seq[String]] =
+    scalacOptions().filterNot(Set(
+      "-Ywarn-unused:imports",
+      "-Ywarn-unused-import",
+      "-Ywarn-dead-code",
+      "-Xfatal-warnings"
+    ))
+
+  /**
+    * The version of Tut to use.
+    */
+  def tutVersion: T[String]
+
+  /**
+    * A task which determines how to fetch the Tut jar file and all of the dependencies required to compile documentation for the module and returns the resulting files.
+    */
+  def tutIvyDeps: T[Agg[PathRef]] = T {
+    Lib.resolveDependencies(
+      repositories :+ MavenRepository(s"https://dl.bintray.com/tpolecat/maven"),
+      Lib.depToDependency(_, scalaVersion()),
+      compileIvyDeps() ++ transitiveIvyDeps() ++ Seq(
+        ivy"org.tpolecat::tut-core:${tutVersion()}"
+      )
+    )
+  }
+
+  /**
+    * A task which performs the dependency resolution for the scalac plugins to be used with Tut.
+    */
+  def tutPluginJars: T[Agg[PathRef]] = resolveDeps(tutScalacPluginIvyDeps)()
+
+  /**
+    * Run Tut using the configuration specified in this module. The working directory used is the [[mill.contrib.tut.TutModule#millSourcePath]].
+    */
+  def tut: T[os.CommandResult] = T {
+    val in = tutSourceDirectory().head.path.toIO.getAbsolutePath
+    val out = tutTargetDirectory().toIO.getAbsolutePath
+    val re = tutNameFilter()
+    val opts = tutScalacOptions()
+    val pOpts = tutPluginJars().map(pathRef => "-Xplugin:" + pathRef.path.toIO.getAbsolutePath)
+    val tutArgs = List(in, out, re.pattern.toString) ++ opts ++ pOpts
+    os.proc(
+      'java,
+      "-cp", tutClasspath().map(_.path.toIO.getAbsolutePath).mkString(java.io.File.pathSeparator),
+      "tut.TutMain",
+      tutArgs
+    ).call(millSourcePath)
+  }
+}
-- 
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