File: overlappingTaskOutputsStatsInit.gradle

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/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.gradle.api.internal.tasks.*

def taskInfos = []

class TaskOutputInfo {
    Class type
    String path
    Map<String, File> outputs
}

gradle.addListener(new TaskExecutionAdapter() {
    @Override
    void afterExecute(Task task, TaskState state) {
        def type = task.getClass()
        if (type.name.endsWith("_Decorated")) {
            type = type.superclass
        }
        def outputs = task.outputs.fileProperties
            .findAll { it instanceof CacheableTaskOutputFilePropertySpec }
            .findAll {
                try {
                    it.outputFile != null
                } catch (Exception ignored) {
                    // Sometimes for some non-cacheable tasks some non-optional outputs can be null
                    // and throw an error when tried to be resolved
                    return false
                }
            }
            .collectEntries { [it.propertyName, it.outputFile] }

        def info = new TaskOutputInfo(
            type: type,
            path: task.path,
            outputs: outputs
        )
        taskInfos.add info
    }
})
gradle.addListener(new BuildAdapter() {
    @Override
    void buildFinished(BuildResult result) {
        println ""
        println "Overlapping task outputs while executing '${gradle.startParameter.taskNames.join(" ")}':"
        println ""
        taskInfos.sort { a, b ->
            a.path <=> b.path
        }
        def byPath = [:].withDefault { [:].withDefault { [] } }
        def root = rootProject.projectDir
        taskInfos.each { taskInfo ->
            taskInfo.outputs.each { outputName, outputFile ->
                byPath[outputFile][outputName].add(taskInfo)
            }
        }
        taskInfos.each { taskInfo ->
            taskInfo.outputs.each { outputName, outputFile ->
                def path = outputFile
                while (true) {
                    path = path.parentFile
                    if (path == null || path == root) {
                        break;
                    }
                    if (byPath.containsKey(path)) {
                        byPath[path][outputName].add(taskInfo)
                    }
                }
            }
        }
        def tasksAffected = []
        byPath.each { path, byName ->
            if (byName.values().flatten()*.path.unique().size() > 1) {
                println "  - ${relPath(root, path)} has overlap between:"
                byName.each { outputName, tasks ->
                    tasks.each { task ->
                        println "      - ${task.path}.$outputName ($task.type.name)"
                    }
                    tasksAffected.addAll tasks
                }
            }
        }
        if (tasksAffected.empty) {
            println "  No tasks with overlapping outputs found"
        } else {
            println ""
            println "  Tasks affected by type:"
            println ""
            tasksAffected*.type.unique().sort { a, b -> a.name <=> b.name }.each { type ->
                println "    - ${type.name}"
                tasksAffected.findAll { task -> task.type == type }.unique { it.path }.each { task ->
                    println "      - ${task.path}"
                }
            }
        }
    }
})

def relPath(File root, File full) {
    root.toURI().relativize(full.toURI()).toString()
}