gradle - configure custom plugin using params from extension

Question

Hi i'm trying to dynamically create and configure task based on plugin extension values, problem seems to be evaluation order, is there any way to work around it?

apply plugin: SetupPlugin 

setup {
     destDir = 'some directory set per project in build.gradle'
     sourceFile = 'some file set per project in build.gradle' 
}


class PluginExtension {
    String destDir
    String sourceFile
}

class SetupPlugin implements Plugin<Project> {
    def placeholders

    void apply(Project project) {
        project.extensions.create("setup", PluginExtension)

        project.task ("setupEnvironment", type: Copy) {
            doFirst() {
                //computes placeholders <-- project.setup has value here
            }

            into (project.setup.destDir){ //<-- project.setup is null
                from project.setup.sourceFile
            }
            filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: placeholders)
        }   
    }
}

Answer 1

将此移动到 doFirst 块可能会导致一些副作用，因为 gradle up to date 任务可能会遇到问题，因为在执行时而不是配置时重新配置复制任务的参数。一个可以解决问题的快速修复是通过使用闭包来推迟评估：

...
void apply(Project project) {
        project.extensions.create("setup", PluginExtension)

        project.task ("setupEnvironment", type: Copy) {
            doFirst() {
                //computes placeholders <-- project.setup has value here
            }

            into {project.setup.destDir}
            from { project.setup.sourceFile }
            filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: placeholders)
        }   
}
...

希望有帮助！

干杯，勒内

Answer 2

原来我问了一个我认为与这个问题非常相似的问题。我可能会遗漏一个细微的区别，但如果它有帮助：就是这样。

Answer 3

这是因为apply在应用设置设置之前调用。

它之所以有效，是doFirst因为它apply在构建期间调用。也许你可以把你的副本包装成doLast?