如何在插件应用中使用gradle插件配置？

Question

我正在编写一个自定义 Gradle 插件，它需要将特定的依赖项添加到子项目中。此依赖项需要用户提供版本信息，因此我决定创建一个 Extension。但是，由于我的属性在我的插件的 apply 方法中被引用，所以在它们被引用之前我不能真正改变它们。我的插件看起来像这样：

class MyPluginExtension {
  abstract String scalaLibraryVersion
  abstract String macroParadiseVersion
}

class MyPlugin implements Plugin<Project> {
  void apply(Project project) {
    project.extensions.create("myConfig", PluginExtension)

    project.configure(project) {
      apply plugin: 'scala'
    }

    String pluginConfiguration = 'myPluginConfiguration'
    project.configurations.create(pluginConfiguration)

    String scalaLib = project.myConfig.scalaLibraryVersion
    String paradise = project.myConfig.macroParadiseVersion
    String paradiseDependency = "org.scalamacros:paradise_${scalaLib}:${paradise}"

    project.dependencies.add(pluginConfiguration, paradiseDependency)

    project.tasks.withType(ScalaCompile) {
      scalaCompileOptions.additionalParameters += [
          "-Xplugin:" + project.configurations.getByName(pluginConfiguration).asPath,
          "-Xplugin-require:macroparadise"
      ]
    }
  }
}

它将像这样应用：

project("incorrect-subproject-1") {
  apply plugin: "carter.my-plugin"
  myConfig.scalaLibraryVersion = "2.11.12" // This is too late. The library version is already set to null
}

project("incorrect-subproject-2") {
  myConfig.scalaLibraryVersion = "2.11.12" // This is too early. myConfig references nothing
  apply plugin: "carter.my-plugin"
}

有更好的方法吗？此插件将供其他开发人员使用，因此我非常希望尽可能保持 API 的良好状态。理想情况下，我想要这样的东西：

project("incorrect-module-1") {
  apply plugin: "carter.my-plugin" {
    scalaLibraryVersion = "2.11.12"
    macroParadiseVersion = "2.1.1"
  }

  // rest of this subproject's configuration
}

我已尝试在 this Gradle support thread 中所述的生命周期回调之一期间添加依赖项。但是，我发现 beforeResolve 回调发生得太早，我的扩展配置没有被使用，而 afterEvaluate 回调发生得太晚，我得到：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':incorrect-subproject-1'.
> Cannot change dependencies of configuration ':incorrect-subproject-1:myPluginConfiguration' after it has been resolved.

当然，如果beforeResolve还不够晚，那么这种事情是不可能的？有没有办法将依赖项解析延迟到项目 "evaluated"?

之后

顺便说一下，我使用的是 Gradle 5.1 版

Answer 1

您应该可以通过参考 project.beforeEvaluate 中的这些设置来实现此目的。举个例子：

void apply(Project project) {
    super.apply(project)

    project.extensions.create("myConfig", Configuration)

    project.beforeEvaluate {
        String scalaLib = project.myConfig.scalaLibraryVersion
        String paradise = project.myConfig.macroParadiseVersion
        String paradiseDependency = "org.scalamacros:paradise_${scalaLib}:${paradise}"

        project.dependencies.add(pluginConfiguration, paradiseDependency)

        project.tasks.withType(ScalaCompile) {
          scalaCompileOptions.additionalParameters += [
            "-Xplugin:" + project.configurations.getByName(pluginConfiguration).asPath,
            "-Xplugin-require:macroparadise"
          ]
        }

    }
}

如何在插件应用中使用gradle插件配置？

How to use gradle plugin configuration in the plugin apply?

gradle

gradle-plugin