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我正在编写一个自定义 Gradle 插件，它需要将某个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apply方法中被引用，所以在它们被引用之前，我实际上无法改变它们。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"
}

有一个更好的方法吗？这个插件将被其他开发人员使用，所以我真的很想保持 API 尽可能好。理想情况下，我想要类似的东西：

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

  // rest of this subproject's configuration
}


我已尝试在此 Gradle 支持线程中所述的生命周期回调之一中添加依赖项。但是，我发现beforeResolve回调发生得太早，我的扩展配置没有使用，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.

想必如果beforeResolve还不够晚的话，这种事情是不可能的吧？有没有办法将依赖解决延迟到项目“评估”之后？

顺便说一句，我使用的是 Gradle 5.1 版

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1 回答 1

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您应该能够通过在 project.beforeEvaluate 中引用这些设置来实现这一点。给你举个例子：

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"
          ]
        }

    }
}
于 2019-09-03T10:56:49.463 回答