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aria-hidden="true"></i></a></div></div><h2 id="common-project-layouts" class="Styles-hoverBox">Common Project Layouts<a href="#common-project-layouts" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h2>
<p>Earlier, we have shown how to work with the Mill default Scala module layout. Here we will explore some other common project layouts that you may want in your Scala build:</p><h3 id="java-project-with-test-suite" class="Styles-hoverBox">Java Project with Test Suite<a href="#java-project-with-test-suite" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">trait JUnitTests extends TestModule {
def testFrameworks = Seq("com.novocode.junit.JUnitFramework")
def ivyDeps = Agg(ivy"com.novocode:junit-interface:0.11")
}
object core extends JavaModule {
object test extends Tests with JUnitTests
}
object app extends JavaModule {
def moduleDeps = Seq(core)
object test extends Tests with JUnitTests
}
</code></pre>
<p>This build is a two-module Java project with junit test suites. It expects the following filesystem layout:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">build.sc
app/
src/hello/
Main.java
test/src/hello/
MyAppTests.java
core/
src/hello/
Core.java
test/src/hello/
MyCoreTests.java
</code></pre>
<p>You can then run the junit tests using <code>mill app.test</code> or <code>mill core.test</code>, and configure which exact tests you want to run using the flags defined on the <a href="https://github.com/sbt/junit-interface#junit-interface">JUnit Test Interface</a>.</p>
<p>For a more more complex, real-world example of a Java build, check out our example build for the popular <a href="https://github.com/ben-manes/caffeine">Caffeine</a> project:</p>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/caffeine/build.sc">Example Build</a></li>
</ul><h3 id="cross-scala-version-modules" class="Styles-hoverBox">Cross Scala-Version Modules<a href="#cross-scala-version-modules" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._
import mill.scalalib._
object foo extends Cross[FooModule]("2.10.6", "2.11.11", "2.12.4")
class FooModule(val crossScalaVersion: String) extends CrossScalaModule {
...
object test extends Tests {
...
}
}
</code></pre>
<p>Mill provides a <code>CrossScalaModule</code> template, which can be used with <code>Cross</code> to cross-build Scala modules across different versions of Scala. The default configuration for <code>CrossScalaModule</code> expects a filesystem layout as follows:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">build.sc
foo/
src/
src-2.10/
src-2.11/
src-2.12/
test/
src/
src-2.10/
src-2.11/
src-2.12/
</code></pre>
<p>Code common to all Scala versions lives in <code>src</code>, while code specific to one version lives in <code>src-x.y</code>.</p><h3 id="scalajs-modules" class="Styles-hoverBox">Scala.js Modules<a href="#scalajs-modules" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._
import mill.scalajslib._
object foo extends ScalaJSModule {
def scalaVersion = "2.12.4"
def scalaJSVersion = "0.6.22"
}
</code></pre>
<p><code>ScalaJSModule</code> is a variant of <code>ScalaModule</code> that builds your code using Scala.js. In addition to the standard <code>foo.compile</code> and <code>foo.run</code> commands (the latter of which runs your code on Node.js, which must be pre-installed) <code>ScalaJSModule</code> also exposes the <code>foo.fastOpt</code> and <code>foo.fullOpt</code> tasks for generating the optimized Javascript file.</p><h3 id="scala-native-modules" class="Styles-hoverBox">Scala Native Modules<a href="#scala-native-modules" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._, scalalib._, scalanativelib._
object hello extends ScalaNativeModule {
def scalaVersion = "2.11.12"
def scalaNativeVersion = "0.3.8"
def logLevel = NativeLogLevel.Info // optional
def releaseMode = ReleaseMode.Debug // optional
}
</code></pre>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">.
├── build.sc
└── hello
├── src
│ └── hello
│ └── Hello.scala
</code></pre>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">// hello/src/hello/Hello.scala
package hello
import scalatags.Text.all._
object Hello{
def main(args: Array[String]): Unit = {
println("Hello! " + args.toList)
println(div("one"))
}
}
</code></pre>
<p>The normal commands <code>mill hello.compile</code>, <code>mill hello.run</code>, all work. If you want to build a standalone executable, you can use <code>mill show hello.nativeLink</code> to create it.</p>
<p><code>ScalaNativeModule</code> builds scala sources to executable binaries using <a href="http://www.scala-native.org">Scala Native</a>. You will need to have the <a href="http://www.scala-native.org/en/latest/user/setup.html">relevant parts</a> of the LLVM toolchain installed on your system. Optimized binaries can be built by setting <code>releaseMode</code> (see above) and more verbose logging can be enabled using <code>logLevel</code>. Currently two test frameworks are supported <a href="https://github.com/lihaoyi/utest">utest</a> and <a href="http://www.scalatest.org/">scalatest</a>. Support for <a href="https://www.scalacheck.org/">scalacheck</a> should be possible when the relevant artifacts have been published for scala native.</p>
<p>Here's a slightly larger example, demonstrating how to use third party dependencies (note the two sets of double-colons <code>::</code> necessary) and a test suite:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._, scalalib._, scalanativelib._
object hello extends ScalaNativeModule {
def scalaNativeVersion = "0.3.8"
def scalaVersion = "2.11.12"
def ivyDeps = Agg(ivy"com.lihaoyi::scalatags::0.6.7")
object test extends Tests{
def ivyDeps = Agg(ivy"com.lihaoyi::utest::0.6.3")
def testFrameworks = Seq("utest.runner.Framework")
}
}
</code></pre>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">.
├── build.sc
└── hello
├── src
│ └── hello
│ └── Hello.scala
└── test
└── src
└── HelloTests.scala
</code></pre>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">// hello/test/src/HelloTests.scala
package hello
import utest._
import scalatags.Text.all._
object HelloTests extends TestSuite{
val tests = Tests{
'pass - {
assert(div("1").toString == "<div>1</div>")
}
'fail - {
assert(123 == 1243)
}
}
}
</code></pre>
<p>The same <code>mill hello.compile</code> or <code>mill hello.run</code> still work, as does `<code>mill
hello.test</code> to run the test suite defined here.</p><h3 id="sbt-compatible-modules" class="Styles-hoverBox">SBT-Compatible Modules<a href="#sbt-compatible-modules" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._
import mill.scalalib._
object foo extends SbtModule {
def scalaVersion = "2.12.4"
}
</code></pre>
<p>These are basically the same as normal <code>ScalaModule</code>s, but configured to follow the SBT project layout:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">build.sc
foo/
src/
main/
scala/
test/
scala/
</code></pre>
<p>Useful if you want to migrate an existing project built with SBT without having to re-organize all your files</p><h3 id="sbt-compatible-cross-scala-version-modules" class="Styles-hoverBox">SBT-Compatible Cross Scala-Version Modules<a href="#sbt-compatible-cross-scala-version-modules" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._
import mill.scalalib._
object foo extends Cross[FooModule]("2.10.6", "2.11.11", "2.12.4")
class FooModule(val crossScalaVersion: String) extends CrossSbtModule {
...
object test extends Tests {
...
}
}
</code></pre>
<p>A <code>CrossSbtModule</code> is a version of <code>CrossScalaModule</code> configured with the SBT project layout:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="text">build.sc
foo/
src/
main/
scala/
scala-2.10/
scala-2.11/
scala-2.12/
test/
scala/
scala-2.10/
scala-2.11/
scala-2.12/
</code></pre><h3 id="publishing" class="Styles-hoverBox">Publishing<a href="#publishing" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="scala">import mill._
import mill.scalalib._
import mill.scalalib.publish._
object foo extends ScalaModule with PublishModule {
def scalaVersion = "2.12.4"
def publishVersion = "0.0.1"
def pomSettings = PomSettings(
description = "My first library",
organization = "com.lihaoyi",
url = "https://github.com/lihaoyi/mill",
licenses = Seq(License.MIT),
versionControl = VersionControl.github("lihaoyi", "mill"),
developers = Seq(
Developer("lihaoyi", "Li Haoyi","https://github.com/lihaoyi")
)
)
}
</code></pre>
<p>You can make a module publishable by extending <code>PublishModule</code>.</p>
<p><code>PublishModule</code> then needs you to define a <code>publishVersion</code> and <code>pomSettings</code>. The <code>artifactName</code> defaults to the name of your module (in this case <code>foo</code>) but can be overriden. The <code>organization</code> is defined in <code>pomSettings</code>.</p>
<p>Once you've mixed in <code>PublishModule</code>, you can publish your libraries to maven central via:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="bash">mill mill.scalalib.PublishModule/publishAll \
lihaoyi:$SONATYPE_PASSWORD \
$GPG_PASSWORD \
foo.publishArtifacts
</code></pre>
<p>This uploads them to <code>oss.sonatype.org</code> where you can log-in and stage/release them manually. You can also pass in the <code>--release true</code> flag to perform the staging/release automatically:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="bash">mill mill.scalalib.PublishModule/publishAll \
lihaoyi:$SONATYPE_PASSWORD \
$GPG_PASSWORD \
foo.publishArtifacts \
--release true
</code></pre>
<p>If you want to publish/release multiple modules, you can use the <code>_</code> or <code>__</code> wildcard syntax:</p>
<pre style="background-color: #f8f8f8"><code style="white-space:pre; background-color: #f8f8f8" class="bash">mill mill.scalalib.PublishModule/publishAll \
lihaoyi:$SONATYPE_PASSWORD \
$GPG_PASSWORD \
__.publishArtifacts \
--release true
</code></pre><h2 id="example-builds" class="Styles-hoverBox">Example Builds<a href="#example-builds" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h2>
<p>Mill comes bundled with example builds for existing open-source projects, as integration tests and examples:</p><h3 id="acyclic" class="Styles-hoverBox">Acyclic<a href="#acyclic" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/acyclic/build.sc#L1">Mill Build</a></li>
</ul>
<p>A small single-module cross-build, with few sources, minimal dependencies, and wired up for publishing to Maven Central.</p><h3 id="better-files" class="Styles-hoverBox">Better-Files<a href="#better-files" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/better-files/build.sc#L1">Mill Build</a></li>
</ul>
<p>A collection of small modules compiled for a single Scala version.</p>
<p>Also demonstrates how to define shared configuration in a <code>trait</code>, enable Scala compiler flags, and download artifacts as part of the build.</p><h3 id="jawn" class="Styles-hoverBox">Jawn<a href="#jawn" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/jawn/build.sc#L1">Mill Build</a></li>
</ul>
<p>A collection of relatively small modules, all cross-built across the same few versions of Scala.</p><h3 id="upickle" class="Styles-hoverBox">Upickle<a href="#upickle" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/upickle/build.sc#L1">Mill Build</a></li>
</ul>
<p>A single cross-platform Scala.js/Scala-JVM module cross-built against multiple versions of Scala, including the setup necessary for publishing to Maven Central.</p><h3 id="ammonite" class="Styles-hoverBox">Ammonite<a href="#ammonite" class=" Styles-hoverLink"><i class="fa fa-link" aria-hidden="true"></i></a></h3>
<ul>
<li><a href="https://github.com/lihaoyi/mill/blob/master/integration/test/resources/ammonite/build.sc#L1">Mill Build</a></li>
</ul>
<p>A relatively complex build with numerous submodules, some cross-built across Scala major versions while others are cross-built against Scala minor versions.</p>
<p>Also demonstrates how to pass one module's compiled artifacts to the <code>run</code>/<code>test</code> commands of another, via their <code>forkEnv</code>.</p><hr /><p><b>About the Author:</b><i> Haoyi is a software engineer, an early contributor to <a href="http://www.scala-js.org/">Scala.js</a>, and the author of many open-source Scala tools such as Mill, the <a href="http://lihaoyi.com/Ammonite">Ammonite REPL</a> and <a href="https://github.com/lihaoyi/fastparse">FastParse</a>. </i></p><p><i>If you've enjoy using Mill, or enjoyed using Haoyi's other open source libraries, please chip in (or get your Company to chip in!) via <a href="https://www.patreon.com/lihaoyi">Patreon</a> so he can continue his open-source work</i></p><hr /><div style="display: flex;flex-direction: row;justify-content: space-between;"><a href="configuring-mill.html"><i class="fa fa-arrow-left" aria-hidden="true"></i> Configuring Mill</a><a href="tasks.html">Tasks <i class="fa fa-arrow-right" aria-hidden="true"></i></a></div></div></body></html>
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