However, it is more succinct than the delegated properties syntax and can reasonably be used if you only need to set the value of an extra property without referencing it later. To activate the Kotlin DSL, simply use the .gradle.kts extension for your build scripts in place of .gradle. The maven{..} function is defined in Kotlin DSL too. org.gradle.api.artifacts.dsl. DSL is a computer language devoted to … Mixing Kotlin DSL scripts with Groovy-based scripts. The general idea is to use statically-typed user-provided function literals which modify the query builder state when invoked.After all of them are called, the builder's state is verified and the resulting SQL string is generated. Specify the version in yout gradle-wrapper.properties: The Kotlin DSL provides the withConvention(T::class) {} extension function to do this: This technique is most commonly required for source sets that are added by language plugins other than the Java Plugin, e.g. If the above isn’t enough to pinpoint the problem, you can enable the org.gradle.kotlin.dsl.logging.tapi system property in your IDE. The goal is to extract common configurations as much as possible so … We discuss both topics in more detail in the following sections. After a lot of pain trying to migrate from Gradle's Groovy to Kotlin DSL on Android Studio, I developed this tool to solve most migration issues and … To demonstrate, the following sample adds the google() repository — where the Android plugin is published — to the repository search list, and uses a resolutionStrategy {} block to map the com.android.application plugin ID to the com.android.tools.build:gradle: artifact available in the google() repository: In fact, the above sample will work for all com.android. E.g. Other IDEs do not yet provide helpful tools for editing Kotlin DSL files, but you can still import Kotlin-DSL-based builds and work with them as usual. The Gradle Kotlin DSL leverages the Kotlin language and its tooling to provide just this. For our example, we'll create a simple tool for constructing SQL queries, just big enough to illustrate the concept. As an example, given the following hypothetical Kotlin function with a Java SAM parameter type: SAM conversion for Kotlin functions enables the following usage of the function: Without SAM conversion for Kotlin functions one would have to explicitly convert the passed lambda: Enables method references to synthetic Java Bean properties. Kotlin Expertise Blog - In this article, I am taking a look at the Gradle Kotlin DSL as an alternative to the classic Groovy approach: It offeres much better support in IDEs as it is backed by a statically typed … I was introduced to Gradle with Kotlin accidentally. Configures the Kotlin compiler with the same settings that are used for Kotlin DSL scripts, ensuring consistency between your build logic and those scripts. As for project extensions and conventions themselves, you can discover what elements are present in any container by either looking at the documentation of the applied plugins or by running gradle kotlinDslAccessorsReport. For example, Gradle 4.3 ships with the Kotlin DSL v0.12.1 that includes Kotlin 1.1.51 versions of these modules. Note that it’s necessary to specify the type of the task explicitly, otherwise the script won’t compile because the inferred type will be Task, not Test, and the testLogging property is specific to the Test task type. Here’s an example that defines a new myNewTaskProperty on the test task and then uses that property to initialize another task: If you’re happy to use eager configuration rather than the configuration avoidance APIs, you could use a single, "global" property for the report type, like this: There is one last syntax for extra properties that we should cover, one that treats extra as a map. If you are among those people who has no idea of how to write Gradle in groovy then kotlin DSL is the one for you. If some plugin makes heavy use of Groovy metaprogramming, then using it from Kotlin or Java or any statically-compiled language can be very cumbersome. The simplest way to interact with containers is through these interfaces. You can unsubscribe at any time. Note that accessors for elements of containers such as configurations, tasks and sourceSets leverage Gradle’s configuration avoidance APIs. Gradle Kotlin DSL. In our sample build script, we want to configure a source set named main within the source set container, which we can do by using the named() method in place of an accessor, like so: All elements within a container-based project extension have a name, so you can use this technique in all such cases. The following example uses a combination of type-safe accessors, the container API and Kotlin delegated properties: Gradle has two main sources of properties that are defined at runtime: project properties and extra properties. If you run into trouble or discover a suspected bug, please report the issue in the Gradle issue tracker.

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