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597 lines
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HTML
597 lines
20 KiB
HTML
<html>
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<head>
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<title>
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Kobalt, by Cedric Beust
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</title>
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<script type="text/javascript" src="../sh/scripts/shCore.js"></script>
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</script>
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</head>
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<body>
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<div class="container">
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<!-- Static navbar -->
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<nav id="kobalt-navbar" class="navbar navbar-default">
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</nav>
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<!-- Main component for a primary marketing message or call to action -->
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<div class="jumbotron">
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<h1>Kobalt</h1>
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<p>A universal build system for the exigent developer.</p>
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<img src="../pics/auto-completion.png" class="img-rounded"/>
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<!--
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<p>
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<a class="btn btn-lg btn-primary" href="../../components/#navbar" role="button">Download »</a>
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</p>
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-->
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</div>
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<div class="col-md-9">
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<h2 class="section" id="downloading">Downloading and installing Kobalt</h2>
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<p>
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<a href="https://github.com/cbeust/kobalt/releases/latest">Download the zip file</a> then unzip it in a location we'll call <code>KOBALT_HOME</code>:
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</p>
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<pre class="brush:plain">
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cd $KOBALT_HOME
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unzip kobalt-xxx.zip
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</pre>
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<p>
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Change to your project directory and call the <code>kobaltw</code> command with <code>--init</code>:
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</p>
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<pre class="brush:plain">
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cd ~/java/project
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$KOBALT_HOME/kobaltw --init
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</pre>
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<p>
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This command will do two things:
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</p>
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<ol>
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<li>Create a default <code>Build.kt</code> file in your current directory based on what was found there.
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<li>Install the Kobalt Wrapper in your current directory (script `kobaltw`) and in the <code>kobalt/</code> directory. From now on, you can just use <code>./kobaltw</code> to build and you can ignore <code>$KOBALT_HOME</code>.
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</ol>
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<p>
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You can now attempt to build your project with Kobalt:
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</p>
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<pre class="brush:plain">
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./kobaltw assemble
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</pre>
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If your project follows a regular build structure (e.g. Maven's hierarchy), this should compile your file and create a .jar file. If not, you will have to make a few edits to your <code>Build.kt</code>.
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As of this writing, Kobalt supports Java and Kotlin projects.
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<h2 class="section" id="structure">Structure of a build file</h2>
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<h3 class="section" indent="1" id="general-concepts">General concepts</h3>
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<p>
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The build file is typically called <code>Built.kt</code> and it is a valid Kotlin file. It contains imports, the declaration of one or more projects and the declaration of additional configurations (e.g. packaging, publishing, etc...). Since it's a Kotlin file, it can also contain any class or function you need:
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</p>
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<pre class="brush:java">
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import com.beust.kobalt.*
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import com.beust.kobalt.plugin.kotlin.kotlinProject
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val kobalt = kotlinProject {
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name = "kobalt"
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group = "com.beust"
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artifactId = name
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version = "0.62"
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directory = homeDir("kotlin/kobalt")
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}
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</pre>
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Here are a few noteworthy details about this small build file:
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<ul>
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<li>You have now declared a variable called <code>kobalt</code> which you can reuse further in your build file, should you ever need to.
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<li>You can specify the directory of the project, which means that one build file can be used to build multiple projects.
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<li>The functions <code>kotlinProject</code> and <code>homeDir</code> are supplied by Kobalt and are referred to as "directives"
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</ul>
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<p>
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In terms of syntax, there are basically three different ways to specify values in a build file:
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</p>
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<ul>
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<li>Individual values for primitives (numbers, strings) are a straight equals sign:
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<pre class="brush:java">
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name = "kobalt"</pre>
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</li>
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<li>
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Parameters that can receive multiple values are usually captured by function calls, so you use parentheses, as usual in Kotlin:
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<pre class="brush:java">
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compile("dep1", "dep2", "dep2")</pre>
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</li>
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<li>
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Complex objects are passed as closures, so you use curly braces to define them:
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<pre class="brush:java">
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dependencies {
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...
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}</pre>
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</li>
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</ul>
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<p>
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Remember that a build file is a valid Kotlin source, so you can use function calls instead of literal values, or any other correct Kotlin code in your build file:
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</p>
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<pre class="brush:java">
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version = readVersion()</pre>
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<h3 class="section" indent="1" id="directives">Directives</h3>
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<p>
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Now that we have declared a project, we can use it to configure additional steps of our build, such as how to assemble it (creating jar and other files):
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</p>
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<pre class="brush:java;highlight=5,6,7,8">
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import com.beust.kobalt.plugin.packaging.assemble
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val kobalt = kotlinProject {
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// ...
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assemble {
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jar {
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}
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}
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}
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</pre>
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<p>
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This is the simplest jar declaration you can have. You can trigger the creation of this jar file by invoking the task <code>"assemble"</code> from the command line. Note the presence of the corresponding <code>import</code>: without it, your build file will not compile. Another interesting details is that the <code>assemble</code> function we just imported is an extension function on the <code>Project</code> class, which is how the import makes it legal to call <code>assemble</code> in the middle of our project. If you remove the import, that line will no longer compile.
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</p>
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<p>
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The <code>jar</code> directive accepts various settings, so let's be a bit more specific. And let's add a zip file too:
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</p>
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<pre class="brush:java">
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assemble {
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jar {
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fatJar = true
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manifest {
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attributes("Main-Class", "com.beust.kobalt.KobaltPackage")
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}
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}
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zip {
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include("kobaltw")
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include(from("$buildDirectory/libs"), to("kobalt/wrapper"),
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"$projectName-$version.jar")
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include(from("modules/wrapper/$buildDirectory/libs"), to("kobalt/wrapper"),
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"$projectName-wrapper.jar")
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}
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</pre>
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<p>
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Our jar file is now declared to be a "fat jar" (which means it will include all its dependencies) and we specified a <code>Main-Class</code> to the jar Manifest, which means we will be able to invoke it with <code>java -jar kobalt-0.61.jar</code>. If you don't like this name, you can override it with a <code>name = "myName.jar"</code> statement.
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</p>
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<p>
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The zip directive follows a similar structure, although here we are specifying which file we want to include. For more details on the <code>packaging</code> plug-in, please see its documentation.
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</p>
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<h3 class="section" indent="1" id="dependencies">Dependencies</h3>
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<p>
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You can declare compile and test dependencies as follows:
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</p>
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<pre class="brush:java">
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dependencies {
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compile("com.beust:jcommander:1.48",
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"com.beust:klaxon:0.14")
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}
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dependenciesTest {
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compile("org.testng:testng:6.9.5")
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}
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</pre>
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<p>
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You can also specify local dependencies with the <code>file</code> directive:
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</p>
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<pre class="brush:java">
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dependencies {
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compile(file("libs/async-http.jar"))
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}
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</pre>
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<h2 class="section" id="maven-repos">Maven repos</h2>
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<h3 class="section" indent="1" id="maven-repos-unauthenticated">Unauthenticated repos</h3>
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<p>
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Kobalt already knows the location of the most popular Maven repos (Maven Central, JCenter, JBoss) but you can add repos with the <code>repos()</code> directive:
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</p>
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<pre class="brush:plain">
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val repos = repos("https://dl.bintray.com/cbeust/maven/")</pre>
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<p>
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By default, this directive takes URL's as strings, but you can also use local
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files with the <code>files</code> directive:
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</p>
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<pre class="brush:plain">
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val repos = repos(file("/some/local/directory"))</pre>
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<p>
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The <code>homeDir()</code> directive can also come in handy when you want
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to specify a directory starting at your home directory:
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</p>
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<pre class="brush:plain">
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val repos = repos(file(homeDir("some/directory/in/your/home")))</pre>
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<h3 class="section" indent="1" id="maven-repos-authenticated">Authenticated repos</h3>
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<p>
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If one of your repos requires basic authentication, you can supply its credentials
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in your <code>local.properties</code> file by specifying keys and values following the format:
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</p>
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<pre class="brush:plain">
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authUrl.{host}.username=xxx
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authUrl.{host}.password=xxx
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</pre>
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<p>
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Note that the host is just the host name portion of the URL (excluding "http://",
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port number, slash and path). For example, for the repo
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<code>"https://dl.bintray.com/cbeust/maven/"</code>, the credentials would be:
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</p>
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<pre class="brush:plain">
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authUrl.dl.bintray.com.username=xxx
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authUrl.dl.bintray.com.password=xxx
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</pre>
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<p>
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If only one of <code>username</code> or <code>password</code> is specified,
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the build will abort with an error.
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</p>
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<h2 class="section" id="using-plug-ins">Using plug-ins</h2>
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<p>
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Kobalt comes with a few preconfigured plug-ins but you will want to include external ones as well, which can be downloaded either from a Maven repository (Sonatype, JCenter, ...) or from a local file.
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</p>
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<p>
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First of all, let's take a quick look at the tasks available in the default distribution (your actual output might differ somewhat):
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</p>
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<pre class="brush:plain">
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$ ./kobaltw --tasks
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===== java =====
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compile Compile the project
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compileTest Compile the tests
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test Run the tests
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clean Clean the project
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===== publish =====
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generatePom Generate the .pom file
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uploadJcenter Upload the artifacts to JCenter
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===== packaging =====
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assemble Package the artifacts
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</pre>
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<p>
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Let's modify our build to include a plug-in. We do this by adding a call to the <code>plugins</code> directive on top of the build file:
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</p>
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<pre class="brush:java">
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val repos = repos("https://dl.bintray.com/cbeust/maven/")
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val p = plugins("com.beust:kobalt-example-plugin:0.42")
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</pre>
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<p>
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Now, run the <code>--tasks</code> command again:
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</p>
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<pre class="brush:plain">
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$ ./kobaltw --tasks
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===== java =====
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compile Compile the project
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===== publish =====
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generatePom Generate the .pom file
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uploadJcenter Upload the artifacts to JCenter
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===== kobalt-example-plugin =====
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coverage Run coverage
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===== packaging =====
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assemble Package the artifacts
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</pre>
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Notice the new <code>"coverage"</code> task, provided by the plug-in <code>kobalt-example-plugin</code> that we just included. With the simple action of declaring the plug-in, it is now fully loaded and available right away. Of course, such plug-ins can allow or require additional configuration with their own directives. Please read the plug-in developer documentation for more details.
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<h2 class="section" id="multiple-projects">Multiple projects</h2>
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<p>
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You can specify more than one project in a build file, simply by declaring them:
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</p>
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<pre class="brush:java">
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val p1 = javaProject { ... }
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val p2 = kotlinProject { ... }
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</pre>
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<p>
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If some of your projects need to be built in a certain order, you can specify dependencies when you create your project. For example:
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</p>
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<pre class="brush:java">
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val p2 = kotlinProject(p1) { ... }
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</pre>
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<p>
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This declares that the Kotlin project <code>p2</code> depends on <code>p1</code>, which means that the project <code>p1</code> will be built first.
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</p>
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<p>
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You can also run tasks for a specific project only as follows:
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</p>
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<pre class="brush:plain">
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./kobaltw p2:assemble
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</pre>
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This will run the <code>assemble</code> task only for the <code>p2</code>, instead of running it for all projects.
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<h2 class="section" id="command-line">Command line</h2>
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<p>
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Here are the options that you can pass to <code>./kobaltw</code>:
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</p>
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<table style="font-size: 14px" class="table table-striped">
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<colgroup>
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<col span="1" style="width: 25%;">
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<col span="1" style="width: 10%;">
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<col span="1" style="width: 10%;">
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<col span="1" style="width: 20%;">
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<col span="1" style="width: 40%;">
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</colgroup>
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<thead>
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<tr>
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<td>Name</td>
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<td>Type</td>
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<td>Default</td>
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<td>Description</td>
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<td>Details</td>
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</tr>
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</thead>
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<tr>
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<td><code>--buildFile</code></td>
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<td>File</td>
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<td>Build.kt</td>
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<td>Specify a build file.</td>
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<td>Use this option if you are trying to build a project that's not in the current directory.</td>
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</tr>
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<tr>
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<td><code>--checkVersions</code></td>
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<td>Boolean</td>
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<td>false</td>td>
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<td>Display all the new versions of your dependencies.</td>
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<td>This option looks at all the dependencies found in your build file and then contacts all the Maven repositories in order to find out if any of these repos contains a newer version. If any are found, they are displayed:
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<pre class="brush:plain">
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$ ./kobaltw --checkVersions
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New versions found:
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com.beust:klaxon:0.14
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org.testng:testng:6.9.5
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</pre>
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</td>
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</tr>
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<tr>
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<td><code>--dryRun</code></td>
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<td>Boolean</td>
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<td>false</td>
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<td>Display the tasks about to be run without actually running them.</td>
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<td>Use this option to get an idea of what the build will run without actually building anything.</td>
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</tr>
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<tr>
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<td><code>--init</code></td>
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<td>Boolean</td>
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<td>false</td>
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<td>Initialize a project for Kobalt.</td>
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<td>This option will create a build file in the current directory (unless one already exists) and will install the Kobalt wrapper.</td>
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</tr>
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<tr>
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<td><code>--log</code></td>
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<td>Integer (0..3)</td>
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<td>1</td>
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<td>Specify the log level.</td>
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<td>The default level is 1. Level 0 will quiet everything and 2 and 3 will display increasingly verbose output.</td>
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</tr>
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<tr>
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<td><code>--resolve</code></td>
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<td>Maven id<br/>(e.g. <code>"com.beust:kobalt:0.228"</code>)</td>
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<td>N/A</td>
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<td>Display information about the given id.</td>
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<td>Display which repo this artifact can be found in and the whole graph of its dependencies.</td>
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</tr>
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<tr>
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<td><code>--tasks</code></td>
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<td>Boolean</td>
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<td>false</td>
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<td>List the tasks available.</td>
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<td>Note that the available tasks will vary depending on which projects are in your build file.</td>
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</tr>
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<tr>
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<td><code>--update</code></td>
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<td>Boolean</td>
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<td>false</td>
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<td>Update Kobalt to the latest version available.</td>
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<td>Use this flag if Kobalt just notified you that a new version is available and you want to update. Another way of doing this is to edit <code>kobalt/wrapper/kobalt-wrapper.properties</code> manually.</td>
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</tr>
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</table>
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<h2 class="section" id="publishing">Publishing</h2>
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<p>
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Kobalt supports JCenter natively so you can upload your project and make it available on JCenter very easily.
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</p>
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<p>
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First of all, make sure you specified the group, artifactId and version of your project, as required by Maven:
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</p>
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<pre class="brush:java">
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val kobalt = kotlinProject {
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group = "com.beust"
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artifactId = "kobalt"
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version = "0.72"
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</pre>
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<p>
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Next, create a file <code>local.properties</code> in the root directory of your project with the following keys:
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</p>
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<pre class="brush:plain">
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bintray.user=...
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bintray.apikey=...
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</pre>
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<p>
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The values for the <code>user</code> and <code>apikey</code> keys can be found in your bintray profile, as described <a href="https://bintray.com/docs/usermanual/interacting/interacting_editingyouruserprofile.html#anchorAPIKEY">here</a>. Note that you should <b>not</b> check this <code>local.properties</code> file into your source control (so add it to <code>.gitignore</code>). Next, make sure that your build creates a jar file (using the <code>packaging</code> directive, as explained above).
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</p>
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<p>
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Now, all you need to do is to upload your package:
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</p>
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<pre class="brush:plain">
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./kobaltw uploadJcenter
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</pre>
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|
<h2 class="section" id="profiles">Profiles</h2>
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<p>
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Profiles allow you to run altered versions of your build file by using command
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|
line parameters.
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|
</p>
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|
<p>
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You start by defining boolean values initialized to <code>false</code> in your build file:
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|
</p>
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<pre class="brush:java">
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|
val experimental = false
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val premium = false
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</pre>
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<p>
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Then you use this variable wherever you need it in your build file:
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</p>
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|
<pre class="brush:java">
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|
val p = javaProject {
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name = if (experimental) "project-exp" else "project"
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version = "1.3"
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|
</pre>
|
|
<p>
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|
Finally, you invoke <code>./kobaltw</code> with the <code>--profiles</code> parameter followed by the profiles you want to activate, separated by a comma:
|
|
</p>
|
|
<pre class="brush:plain">
|
|
./kobaltw -profiles experimental,premium assemble
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</pre>
|
|
<p>
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Keep in mind that since your build file is a real Kotlin source file,
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|
you can use these profile variables pretty much anywhere, e.g.:
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|
</p>
|
|
<pre class="brush:java">
|
|
dependencies {
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|
if (experimental)
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|
"com.squareup.okhttp:okhttp:2.4.0"
|
|
else
|
|
"com.squareup.okhttp:okhttp:2.5.0",
|
|
</pre>
|
|
|
|
<h2 class="section" id="sources">Sources and license</h2>
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|
|
|
<p>
|
|
Kobalt is <a href="https://github.com/cbeust/kobalt/blob/master/LICENSE.txt">licensed under Apache 2.0</a> and is <a href="http://github.com/cbeust/kobalt">currently hosted on github.</a>
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|
</p>
|
|
|
|
<h2 class="section" id="discuss">Discuss Kobalt</h2>
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|
|
|
<p>
|
|
If you are interested in discussing Kobalt related topics with other fellow users or developers, you have several options:
|
|
</p>
|
|
|
|
<ul>
|
|
<li>Live discussions are happening on Kotlin's Slack Channel, managed by JetBrains. You can get an automated invitation <a href="http://kotlinslackin.herokuapp.com/">here</a> and then, just join the <code>#kobalt</code> channel.
|
|
</li>
|
|
<li><a href="https://groups.google.com/forum/#!forum/kobalt-users">Join <code>kobalt-users</code>, the mailing-list for Kobalt users.</a></li>
|
|
<li><a href="https://groups.google.com/forum/#!forum/kobalt-dev">Join <code>kobalt-dev</code>, the mailing-list for Kobalt developers</a>. This mailing-list is for people interested in writing code for Kobalt, either the core, or writing plug-ins, or just to follow various technical discussions about Kobalt's internals.</li>
|
|
</ul>
|
|
|
|
<p>
|
|
</p>
|
|
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|
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|
</div>
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<!-- Table of contents -->
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<div class="col-md-3" id="table-of-contents">
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|
</div>
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</div> <!-- /container -->
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<script src="../bootstrap/dist/js/bootstrap.min.js"></script>
|
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<script src="../js/kobalt.js"></script>
|
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<script>generateKobalt(1);</script>
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