{}, using delegateClosureOf {} これはQiita Kotlin Advent Calendar 2019 7日目の記事です。6日目は @yt8492 さんのKotlin向けgRPC/protobufライブラリKroto+を使ってみよう、8日目は@nnao45さんのkotlin製ORM Exposed小技集です。 どうも、株式会社 justInCaseの開発担当の子会社であるjustInCase TechnologiesでバイトとしてAWS CDKのラッパーライブラリを自動生成する奴を作ってるトリナーと申します。 Gradle Kotlin DSLはGradle 5.0で正式版になった、GradleのビルドスクリプトをKotlinで書ける機能です。 従来のビルドス … ", which then is put into the id (plugin: String) … I was introduced to Gradle with Kotlin accidentally. The script was made to convert build.gradle in build.gradle.kts, but it can also help in the migration if you paste something that is not in Kotlin DSL formatand you want it converted. Calling a Kotlin extension from Groovy, Example 19. As the following sample shows for the sourceSets {} and java {} blocks from the original example build script, you can use the configure() function with the corresponding type to do that: Note that sourceSets is a Gradle extension on Project of type SourceSetContainer and java is an extension on Project of type JavaPluginExtension. The Gradle build model makes heavy use of container objects (or just "containers"). Cross project configuration is a mechanism by which you can configure a project from another project’s build script. Enables the experimental Kotlin compiler inference engine (required for SAM conversion for Kotlin functions). For example, Task extends ExtensionAware, so you can attach extra properties to tasks as well. 1 Kotlin syntax highlighting in Gradle Kotlin DSL scripts We recommend against enabling the incubating configuration on demand feature as it can lead to very hard-to-diagnose problems. Nur Rohman. Reason to use kotlin scripts. without the package name part. If you run into trouble or discover a suspected bug, please report the issue in the Gradle issue tracker. Using an unexpected version of the kotlin-dsl plugin in a build will emit a warning and can cause hard to diagnose problems. For example, the Android Plugin for Gradle is not published to the Gradle Plugin Portal and — at least up to version 3.2.0 of the plugin — the metadata required to resolve the artifacts for a given plugin identifier is not published to the Google repository. Note that you can’t use this technique if you want to apply such a plugin either to the root project build script of a multi-project build (rather than solely to its subprojects) or to a single-project build. The Gradle Kotlin DSL provides support for writing Gradle build scripts using JetBrains' Kotlin language. We are also using standard APIs instead of type-safe accessors to configure tasks, extensions and conventions — an approach that we discussed in more detail elsewhere. org.gradle.api.artifacts. These guides and references help you have the best experience building your Kotlin libraries and applications with Gradle: Kotlin itself is built with Gradle Kotlin DSL, Gradle is the official build tool for Android, guide to migrating build scripts to Kotlin, best practices on organizing Gradle projects. Mixing Kotlin DSL scripts with Groovy-based scripts. Groovy DSL script files use the .gradle file name extension. Configures the Kotlin compiler with the same settings that are used for Kotlin DSL scripts, ensuring consistency between your build logic and those scripts. Enables SAM (Single Abstract Method) conversion for Kotlin functions in order to allow Kotlin build logic to expose and consume org.gradle.api.Action based APIs. Welcome! In addition, Kotlin delegated properties can easily be renamed via IDE refactoring. Kotlin + Gradle: a technology combination sure to foster developer happiness and productivity. 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. Edit Page Using Gradle. More generally, between any plugin that transitively depends on kotlin-stdlib and its version shipped with Gradle. Some of the Gradle core plugins expose configurability with the help of a so-called convention object. When configuring several elements of a container one can group interactions in a block in order to avoid repeating the container’s name on each interaction. As a last resort, you can also check a plugin’s source code, but that shouldn’t be necessary in the majority of cases. Taking this approach means that you won’t be able to use type-safe accessors for model elements contributed by the plugins. In addition, IntelliJ IDEA and Android Studio might spawn up to 3 Gradle daemons when editing Gradle scripts — one for each type of script: build scripts, settings files and initialization scripts. You accomplish both steps by configuring a pluginManagement {} block in the build’s settings script. If you are interested in migrating an existing Gradle build to the Kotlin DSL, please also check out the dedicated migration section. After a little Google-ing, everything was clear. We discuss both topics in more detail in the following sections. Many of the objects, functions and properties you use in your build scripts come from the Gradle API and the APIs of the applied plugins. As mentioned in the limitations, you must import your project from the Gradle model to get content-assist and refactoring tools for Kotlin DSL scripts in IntelliJ IDEA. Think named configurations, named source sets, and so on. It is checked periodically (at most every 24 hours) and log files are deleted if they haven’t been used for 7 days. The following example demonstrates several features of the method on the object target: The maven-plugin sample demonstrates the use of the withGroovyBuilder() utility extensions for configuring the uploadArchives task to deploy to a Maven repository with a custom POM using Gradle’s core Maven Plugin. DSL is a computer language devoted to … The Kotlin DSL is fully supported by IntelliJ IDEA and Android Studio. having build.gradle of one module written with Groovy, and another module — with Kotlin DSL; Update Gradle version. Kotlin DSL for the root build.gradle.kts. they are declared on the Task interface. Kotlin DSL for the app build.gradle.kts. Kotlin DSL allows you to access extra properties and create new ones via delegated properties, using any of the by extra forms demonstrated in the following sample: This approach works for all Gradle scripts: project build scripts, script plugins, settings scripts and initialization scripts. This means that you can use type-safe accessors for the model elements that they contribute. Each Gradle release is meant to be used with a specific version of the kotlin-dsl plugin and compatibility between arbitrary Gradle releases and kotlin-dsl plugin versions is not guaranteed. It aims to provide Gradle users with a rich, flexible and statically-typed approach to developing build logic in conjunction with the best IDE and tooling experience possible. To call a Kotlin function that has named arguments from Groovy, just use a normal method call with positional parameters. Long story short, I removed groovy from my Gradle build tool in my Android project, and replaced it with Kotlin. will resolve the problem. 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. Open source has a … This makes it easier to keep plugin versions consistent across projects within a build. The Kotlin Multiplatform Gradle plugin is a tool for creating Kotlin multiplatform projects. Kotlin is a type safe language which means that we need to be more strict now on our scripts, specially when migrating Groovy ones. Another consideration with multi-project builds is that you won’t be able to use type-safe accessors when configuring subprojects within the root build script or with other forms of cross configuration between projects. org.gradle.api. The KotlinClosure0 to KotlinClosure2 types allows adapting Kotlin functions to Groovy closures with more flexibility. Plugins fetched from a source other than the Gradle Plugin Portal may or may not be usable with the plugins {} block. In order to build a Kotlin project with Gradle, you should apply the Kotlin Gradle plugin to your project and configure dependencies.. Plugin and versions. You can use the official Kotlin Gradle Plugin from JetBrains to compile your Kotlin code to target JVM, Android, and JS. 在 Gradle 5.0 之後就可以開始支援在 *.gradle 檔案裡面使用 Kotlin DSL，這篇文章將會講解如何把 Android 專案的 Gradle build script 轉換為使用 Kotlin DSL，讓你可以直接無痛使用 Kotlin 撰寫 *.gradle，而捨棄（超難用）的 Groovy 語法。 Gradle’s Kotlin DSL provides an alternative syntax to the traditional Groovy DSL with an enhanced editing experience in supported IDEs, with superior content assist, refactoring, documentation, and more. What follows is an example of this approach using three subprojects and three plugins. Gradle的Kotlin DSL提供了传统Groovy DSL的替代语法，并在受支持的IDE中提供了增强的编辑体验，并具有出色的内容辅助，重构，文档等功能，这是官方给出的一些定义，当然，他也是有限制的，所以尽可能的保证Gradle和Android版本为最新版本是很有必要的，当然，JDK的版本至少是在8或者以上，有了这些铺垫之后，我们就可以开始着手来改造一个项目了 s1m0nw1. Kotlin DSL brings the simplicity of the Kotlin language syntax and rich API set right into the script files on top of that code completion makes it perfect to work with Gradle script files. 2 code completion, navigation to sources, documentation, refactorings etc…​ in Gradle Kotlin DSL scripts. You also can not use type-safe accessors in Binary Gradle plugins implemented in Kotlin. Swag is coming back! The main reason for this is the slower script compilation for Kotlin DSL. You can unsubscribe at any time. However, this approach does mean that you can use type-safe accessors for any model elements that are contributed by plugins that are applied by parent projects. As long as the combination is compatible everything should work. You can bring the elegance and type-safety of Kotlin to your automation. If your build is a multi-project build and you don’t need to apply such a plugin to your root project, then you can get round this issue using the technique described above. The Kotlin DSL currently supports type-safe model accessors for any of the following that are contributed by plugins: Dependency and artifact configurations (such as implementation and runtimeOnly contributed by the Java Plugin), Project extensions and conventions (such as sourceSets), Elements in the tasks and configurations containers, Elements in project-extension containers (for example the source sets contributed by the Java Plugin that are added to the sourceSets container). If so, in my case the issue was that I accidentally included the user / password into the systemProp.http.proxyHost URL instead of splitting them out into the systemProp.http.proxyUser and … I just created a new Spring project and the built file looked kind of strange. May 15, ... One of them is support for writing domain-specific language or DSL. Some of them can contain objects of different types and implement PolymorphicDomainObjectContainer. Existing Java code can be called from Kotlin in a natural way, and Kotlin code can be used from Java rather smoothly as well. Here’s an example: Both the Groovy and Kotlin languages support named function parameters and default arguments, although they are implemented very differently. The builder has the url property, but the type of it is java.net.URI and not String.I do not like to create a URI class instance in my Gradle scripts manually. If you can run the build successfully from the command line but your script editor is complaining, then you should try restarting your IDE and invalidating its caches. You can use string literals for configuration names in dependency declarations and within the configurations {} block. Here are some examples that illustrate the situations in which configuration avoidance applies: For all other containers than tasks, accessors for elements are of type NamedDomainObjectProvider and provide the same behavior. I am a tester a nd have been coding for a living for the past couple of years now. Example 1. To call a Kotlin extension function from Groovy, call it as a static function, passing the receiver as the first parameter: Kotlin extension functions are package-level functions and you can learn how to locate the name of the type declaring a given Kotlin extension in the Package-Level Functions section of the Kotlin reference documentation. That section also describes which containers support type-safe accessors. Gradle’s Kotlin DSL provides an alternative syntax to the traditional Groovy DSL with an enhanced editing experience in supported IDEs, with superior content assist, refactoring, documentation, and more. Project extensions and conventions have both a name and a unique type, but the Kotlin DSL only needs to know the type in order to configure them. Both the Groovy and Kotlin languages support extending existing classes via Groovy Extension modules and Kotlin extensions. We will use the lates Gradle version, as it includes the latest Kotlin DSL version. org.gradle. By default, the plugin warns about using experimental features of the Kotlin compiler. Declare plugin dependencies in the root build script using the, Example 12. We recommend that you apply the following conventions to get better IDE support: Name settings scripts (or any script that is backed by a Gradle Settings object) according to the pattern *.settings.gradle.kts — this includes script plugins that are applied from settings scripts. Gradle’s Kotlin DSL comes with a change of mindset when writing your build script. 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. Kotlin DSL script files use the .gradle.kts file name extension. Step by step Android groovy to kotlin DSL. Configuring source set conventions, Example 8. Gradle Kotlin DSL. Initialization scripts, settings scripts, script plugins do not. And as a last resort, you may be able to view the plugin’s source code to find out what it does, but that shouldn’t be necessary in the majority of cases. The level of support varies based on the versions of each. Extra properties are available on any object that implements the ExtensionAware interface. Kotlin itself is built with Gradle Kotlin DSL and Note that you can also use the the() function if you only need a reference to the extension or convention without configuring it, or if you want to perform a one-line configuration, like so: The snippet above also demonstrates one way of configuring the elements of a project extension that is a container. The Gradle Kotlin DSL Primer user manual chapter is the best place to start learning more: it will cover all the basics and answer most of your questions. There is a simple workaround for this, based on this advice from the Kotlin DSL primer. If you can’t find a type-safe accessor, fall back to using the normal API for the corresponding types. 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. org.gradle.api.artifacts.dsl. Consider the sample build script shown above that demonstrates the use of type-safe accessors. The Kotlin Gradle plugin 1.4.21 works with Gradle 5.4 and later. There’s also a Kotlin DSL for Gradle available: Gradle-Script-Kotlin . That way you get early feedback while editing Gradle scripts and control over when the whole build setup gets synchronized with your IDE. To call a Groovy function with named arguments from Kotlin, you need to pass a Map, as shown in this example: To call a Groovy function with default arguments from Kotlin, always pass values for all the parameters. 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kotlin dsl gradle

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It automates the publication of the metadata necessary to make your plugins usable with the plugins {} block. This means that you can configure tasks in the same way as you do for source sets, as you can see in this example: We are using the Gradle API to refer to the tasks by name and type, rather than using accessors. In this case, there’s no need to import the Test task type as it is part of the Gradle API and is therefore imported implicitly. Only the main project build scripts and precompiled project script plugins have type-safe model accessors. You can also access extra properties on a root project from a subproject using the following syntax: Extra properties aren’t just limited to projects. It’s not really different from any other new API in Gradle. Create a file, fabric.gradle , in the module where you apply the io.fabric plugin. It depends on how they have been published and, specifically, whether they have been published with the necessary plugin marker artifacts. These serve a similar purpose to — and have now been superseded by — extensions. Browse other questions tagged android android-studio build.gradle gradle-kotlin-dsl kotlin-multiplatform or ask your own question. This will become less of an issue as the language matures. May 15, ... One of them is support for writing domain-specific language or DSL. Gradle has features you cannot get from other build tools: A highly-customizable dependency resolution engine, visual build inspection and debugging tools, and many work avoidance mechanisms. These and other reasons are why This will happen both at the top level of your build scripts — most plugin extensions are added to the Project object — and within the blocks that configure an extension. Saran saya, gunakan Gradle versi 5.0 karena sudah mendukung Kotlin DSL 1.0.. Di sini kita akan fokus pada 3 (tiga) file yang terdapat pada proyek tersebut yaitu settings.gradle, build.gradle (project), dan build.gradle (app).Ketiga file tersebut merupakan Gradle scripts yang secara default dituliskan dengan Groovy. The goal is to extract common configurations as much as possible so … The following project build script demonstrates how you can access various configurations, extensions and other elements using type-safe accessors: Your IDE knows about the type-safe accessors, so it will include them in its suggestions. Kotlin DSL is fully supported in Intellij IDEA and Android Studio. If you are working with an existing build using the Gradle Groovy DSL you’ll be interested in the Migrating build logic from Groovy to Kotlin guide. The following sample demonstrates how to reference and configure artifact configurations without type accessors: The code looks similar to that for the type-safe accessors, except that the configuration names are string literals in this case. The Groovy DSL allows you to reference many elements of the build model by name, even when they are defined at runtime. Please avoid using convention objects when writing new plugins. You can declare your plugins within the subprojects to which they apply, but we recommend that you also declare them within the root project build script. As an example, let’s modify the Java/Ratpack sample build to fully configure its subprojects from the root project build script: Note how we’re using the apply() method to apply the plugins since the plugins {} block doesn’t work in this context. Project extensions and conventions, Example 5. The embedded Kotlin compiler is known to work on Linux, macOS, Windows, Cygwin, FreeBSD and Solaris on x86-64 architectures. The same mostly applies to interoperability with Groovy code. This will cause the Gradle Daemon to log extra information in its log file located in $HOME/.gradle/daemon. 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 … The static nature of Kotlin enables both compile time checking and authoring assistance from your IDE, from auto-completion to refactoring and everything in-between. All containers in Gradle implement NamedDomainObjectContainer. To call a Kotlin function that has default arguments from Groovy, always pass values for all the function parameters. Name initialization scripts according to the pattern *.init.gradle.kts or simply init.gradle.kts. To call a Groovy extension method from Kotlin, the same approach applies: call it as a static function passing the receiver as the first parameter. That includes buildSrc projects, included builds and Gradle plugins. The maven{..} function is defined in Kotlin DSL too. Gradle has features you cannot get from other build tools: A highly-customizable dependency resolution engine, visual build inspection and debugging tools, and many work avoidance mechanisms. In IntelliJ IDEA this can be done by opening Help > Edit Custom VM Options…​ and adding -Dorg.gradle.kotlin.dsl.logging.tapi=true. The Kotlin DSL will not support the model {} block, which is part of the discontinued Gradle Software Model. However, you can apply model rules from scripts — see the model rules sample for more information. When applying on build.gradle, the script will create, for example, build.gradle.kts.When applyi… Most importantly, the Kotlin Gradle plugin for JVM applications is included, which we can do with the DSL-specific function kotlin (module: String), that takes its module argument and appends it to "org.jetbrains.kotlin. The Overflow Blog Ciao Winter Bash 2020! You can find all the details on the source code. And if you’re using gradle with kotlin dsl build scripts then chances are documentation will be even sparser. For example, both configurations and tasks are container objects that contain Configuration and Task objects respectively. Playing Gradle Script with Kotlin DSL in Android Project. Note that the recommended Maven Publish Plugin provides a type-safe and Kotlin-friendly DSL that allows you to easily do the same and more without resorting to withGroovyBuilder(). We recommend against using this in general as you lose the benefits of Kotlin’s type checking and it prevents IDEs from providing as much support as they could. For example, this includes any configurations you might define in your own build script. Any model elements contributed after that point do not work with type-safe model accessors. 멀티 프로젝트를 빌드할 때는 각 모듈별로 각각 Groovy DSL 과 Kotlin DSL 을 작성하여 사용가능하다. Elements of project extensions that are containers, Example 7. Kotlin has fully-fledged support for both, as described in the Kotlin language reference under named arguments and default arguments. Usually, if you get a NullPointerException with closureOf {}, using delegateClosureOf {} これはQiita Kotlin Advent Calendar 2019 7日目の記事です。6日目は @yt8492 さんのKotlin向けgRPC/protobufライブラリKroto+を使ってみよう、8日目は@nnao45さんのkotlin製ORM Exposed小技集です。 どうも、株式会社 justInCaseの開発担当の子会社であるjustInCase TechnologiesでバイトとしてAWS CDKのラッパーライブラリを自動生成する奴を作ってるトリナーと申します。 Gradle Kotlin DSLはGradle 5.0で正式版になった、GradleのビルドスクリプトをKotlinで書ける機能です。 従来のビルドス … ", which then is put into the id (plugin: String) … I was introduced to Gradle with Kotlin accidentally. The script was made to convert build.gradle in build.gradle.kts, but it can also help in the migration if you paste something that is not in Kotlin DSL formatand you want it converted. Calling a Kotlin extension from Groovy, Example 19. As the following sample shows for the sourceSets {} and java {} blocks from the original example build script, you can use the configure() function with the corresponding type to do that: Note that sourceSets is a Gradle extension on Project of type SourceSetContainer and java is an extension on Project of type JavaPluginExtension. The Gradle build model makes heavy use of container objects (or just "containers"). Cross project configuration is a mechanism by which you can configure a project from another project’s build script. Enables the experimental Kotlin compiler inference engine (required for SAM conversion for Kotlin functions). For example, Task extends ExtensionAware, so you can attach extra properties to tasks as well. 1 Kotlin syntax highlighting in Gradle Kotlin DSL scripts We recommend against enabling the incubating configuration on demand feature as it can lead to very hard-to-diagnose problems. Nur Rohman. Reason to use kotlin scripts. without the package name part. If you run into trouble or discover a suspected bug, please report the issue in the Gradle issue tracker. Using an unexpected version of the kotlin-dsl plugin in a build will emit a warning and can cause hard to diagnose problems. For example, the Android Plugin for Gradle is not published to the Gradle Plugin Portal and — at least up to version 3.2.0 of the plugin — the metadata required to resolve the artifacts for a given plugin identifier is not published to the Google repository. Note that you can’t use this technique if you want to apply such a plugin either to the root project build script of a multi-project build (rather than solely to its subprojects) or to a single-project build. The Gradle Kotlin DSL provides support for writing Gradle build scripts using JetBrains' Kotlin language. We are also using standard APIs instead of type-safe accessors to configure tasks, extensions and conventions — an approach that we discussed in more detail elsewhere. org.gradle.api.artifacts. These guides and references help you have the best experience building your Kotlin libraries and applications with Gradle: Kotlin itself is built with Gradle Kotlin DSL, Gradle is the official build tool for Android, guide to migrating build scripts to Kotlin, best practices on organizing Gradle projects. Mixing Kotlin DSL scripts with Groovy-based scripts. Groovy DSL script files use the .gradle file name extension. Configures the Kotlin compiler with the same settings that are used for Kotlin DSL scripts, ensuring consistency between your build logic and those scripts. Enables SAM (Single Abstract Method) conversion for Kotlin functions in order to allow Kotlin build logic to expose and consume org.gradle.api.Action based APIs. Welcome! In addition, Kotlin delegated properties can easily be renamed via IDE refactoring. Kotlin + Gradle: a technology combination sure to foster developer happiness and productivity. 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. Edit Page Using Gradle. More generally, between any plugin that transitively depends on kotlin-stdlib and its version shipped with Gradle. Some of the Gradle core plugins expose configurability with the help of a so-called convention object. When configuring several elements of a container one can group interactions in a block in order to avoid repeating the container’s name on each interaction. As a last resort, you can also check a plugin’s source code, but that shouldn’t be necessary in the majority of cases. Taking this approach means that you won’t be able to use type-safe accessors for model elements contributed by the plugins. In addition, IntelliJ IDEA and Android Studio might spawn up to 3 Gradle daemons when editing Gradle scripts — one for each type of script: build scripts, settings files and initialization scripts. You accomplish both steps by configuring a pluginManagement {} block in the build’s settings script. If you are interested in migrating an existing Gradle build to the Kotlin DSL, please also check out the dedicated migration section. After a little Google-ing, everything was clear. We discuss both topics in more detail in the following sections. Many of the objects, functions and properties you use in your build scripts come from the Gradle API and the APIs of the applied plugins. As mentioned in the limitations, you must import your project from the Gradle model to get content-assist and refactoring tools for Kotlin DSL scripts in IntelliJ IDEA. Think named configurations, named source sets, and so on. It is checked periodically (at most every 24 hours) and log files are deleted if they haven’t been used for 7 days. The following example demonstrates several features of the method on the object target: The maven-plugin sample demonstrates the use of the withGroovyBuilder() utility extensions for configuring the uploadArchives task to deploy to a Maven repository with a custom POM using Gradle’s core Maven Plugin. DSL is a computer language devoted to … The Kotlin DSL is fully supported by IntelliJ IDEA and Android Studio. having build.gradle of one module written with Groovy, and another module — with Kotlin DSL; Update Gradle version. Kotlin DSL for the root build.gradle.kts. they are declared on the Task interface. Kotlin DSL for the app build.gradle.kts. Kotlin DSL allows you to access extra properties and create new ones via delegated properties, using any of the by extra forms demonstrated in the following sample: This approach works for all Gradle scripts: project build scripts, script plugins, settings scripts and initialization scripts. This means that you can use type-safe accessors for the model elements that they contribute. Each Gradle release is meant to be used with a specific version of the kotlin-dsl plugin and compatibility between arbitrary Gradle releases and kotlin-dsl plugin versions is not guaranteed. It aims to provide Gradle users with a rich, flexible and statically-typed approach to developing build logic in conjunction with the best IDE and tooling experience possible. To call a Kotlin function that has named arguments from Groovy, just use a normal method call with positional parameters. Long story short, I removed groovy from my Gradle build tool in my Android project, and replaced it with Kotlin. will resolve the problem. 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. Open source has a … This makes it easier to keep plugin versions consistent across projects within a build. The Kotlin Multiplatform Gradle plugin is a tool for creating Kotlin multiplatform projects. Kotlin is a type safe language which means that we need to be more strict now on our scripts, specially when migrating Groovy ones. Another consideration with multi-project builds is that you won’t be able to use type-safe accessors when configuring subprojects within the root build script or with other forms of cross configuration between projects. org.gradle.api. The KotlinClosure0 to KotlinClosure2 types allows adapting Kotlin functions to Groovy closures with more flexibility. Plugins fetched from a source other than the Gradle Plugin Portal may or may not be usable with the plugins {} block. In order to build a Kotlin project with Gradle, you should apply the Kotlin Gradle plugin to your project and configure dependencies.. Plugin and versions. You can use the official Kotlin Gradle Plugin from JetBrains to compile your Kotlin code to target JVM, Android, and JS. 在 Gradle 5.0 之後就可以開始支援在 *.gradle 檔案裡面使用 Kotlin DSL，這篇文章將會講解如何把 Android 專案的 Gradle build script 轉換為使用 Kotlin DSL，讓你可以直接無痛使用 Kotlin 撰寫 *.gradle，而捨棄（超難用）的 Groovy 語法。 Gradle’s Kotlin DSL provides an alternative syntax to the traditional Groovy DSL with an enhanced editing experience in supported IDEs, with superior content assist, refactoring, documentation, and more. What follows is an example of this approach using three subprojects and three plugins. Gradle的Kotlin DSL提供了传统Groovy DSL的替代语法，并在受支持的IDE中提供了增强的编辑体验，并具有出色的内容辅助，重构，文档等功能，这是官方给出的一些定义，当然，他也是有限制的，所以尽可能的保证Gradle和Android版本为最新版本是很有必要的，当然，JDK的版本至少是在8或者以上，有了这些铺垫之后，我们就可以开始着手来改造一个项目了 s1m0nw1. Kotlin DSL brings the simplicity of the Kotlin language syntax and rich API set right into the script files on top of that code completion makes it perfect to work with Gradle script files. 2 code completion, navigation to sources, documentation, refactorings etc…​ in Gradle Kotlin DSL scripts. You also can not use type-safe accessors in Binary Gradle plugins implemented in Kotlin. Swag is coming back! The main reason for this is the slower script compilation for Kotlin DSL. You can unsubscribe at any time. However, this approach does mean that you can use type-safe accessors for any model elements that are contributed by plugins that are applied by parent projects. As long as the combination is compatible everything should work. You can bring the elegance and type-safety of Kotlin to your automation. If your build is a multi-project build and you don’t need to apply such a plugin to your root project, then you can get round this issue using the technique described above. The Kotlin DSL currently supports type-safe model accessors for any of the following that are contributed by plugins: Dependency and artifact configurations (such as implementation and runtimeOnly contributed by the Java Plugin), Project extensions and conventions (such as sourceSets), Elements in the tasks and configurations containers, Elements in project-extension containers (for example the source sets contributed by the Java Plugin that are added to the sourceSets container). If so, in my case the issue was that I accidentally included the user / password into the systemProp.http.proxyHost URL instead of splitting them out into the systemProp.http.proxyUser and … I just created a new Spring project and the built file looked kind of strange. May 15, ... One of them is support for writing domain-specific language or DSL. Some of them can contain objects of different types and implement PolymorphicDomainObjectContainer. Existing Java code can be called from Kotlin in a natural way, and Kotlin code can be used from Java rather smoothly as well. Here’s an example: Both the Groovy and Kotlin languages support named function parameters and default arguments, although they are implemented very differently. The builder has the url property, but the type of it is java.net.URI and not String.I do not like to create a URI class instance in my Gradle scripts manually. If you can run the build successfully from the command line but your script editor is complaining, then you should try restarting your IDE and invalidating its caches. You can use string literals for configuration names in dependency declarations and within the configurations {} block. Here are some examples that illustrate the situations in which configuration avoidance applies: For all other containers than tasks, accessors for elements are of type NamedDomainObjectProvider and provide the same behavior. I am a tester a nd have been coding for a living for the past couple of years now. Example 1. To call a Kotlin extension function from Groovy, call it as a static function, passing the receiver as the first parameter: Kotlin extension functions are package-level functions and you can learn how to locate the name of the type declaring a given Kotlin extension in the Package-Level Functions section of the Kotlin reference documentation. That section also describes which containers support type-safe accessors. Gradle’s Kotlin DSL provides an alternative syntax to the traditional Groovy DSL with an enhanced editing experience in supported IDEs, with superior content assist, refactoring, documentation, and more. Project extensions and conventions have both a name and a unique type, but the Kotlin DSL only needs to know the type in order to configure them. Both the Groovy and Kotlin languages support extending existing classes via Groovy Extension modules and Kotlin extensions. We will use the lates Gradle version, as it includes the latest Kotlin DSL version. org.gradle. By default, the plugin warns about using experimental features of the Kotlin compiler. Declare plugin dependencies in the root build script using the, Example 12. We recommend that you apply the following conventions to get better IDE support: Name settings scripts (or any script that is backed by a Gradle Settings object) according to the pattern *.settings.gradle.kts — this includes script plugins that are applied from settings scripts. Gradle’s Kotlin DSL comes with a change of mindset when writing your build script. 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. Kotlin DSL script files use the .gradle.kts file name extension. Step by step Android groovy to kotlin DSL. Configuring source set conventions, Example 8. Gradle Kotlin DSL. Initialization scripts, settings scripts, script plugins do not. And as a last resort, you may be able to view the plugin’s source code to find out what it does, but that shouldn’t be necessary in the majority of cases. The level of support varies based on the versions of each. Extra properties are available on any object that implements the ExtensionAware interface. Kotlin itself is built with Gradle Kotlin DSL and Note that you can also use the the() function if you only need a reference to the extension or convention without configuring it, or if you want to perform a one-line configuration, like so: The snippet above also demonstrates one way of configuring the elements of a project extension that is a container. The Gradle Kotlin DSL Primer user manual chapter is the best place to start learning more: it will cover all the basics and answer most of your questions. There is a simple workaround for this, based on this advice from the Kotlin DSL primer. If you can’t find a type-safe accessor, fall back to using the normal API for the corresponding types. 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. org.gradle.api.artifacts.dsl. Consider the sample build script shown above that demonstrates the use of type-safe accessors. The Kotlin Gradle plugin 1.4.21 works with Gradle 5.4 and later. There’s also a Kotlin DSL for Gradle available: Gradle-Script-Kotlin . That way you get early feedback while editing Gradle scripts and control over when the whole build setup gets synchronized with your IDE. To call a Groovy function with named arguments from Kotlin, you need to pass a Map, as shown in this example: To call a Groovy function with default arguments from Kotlin, always pass values for all the parameters.

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