Track execution time per task in gradle script?

Question

What is the most elegant way to track the execution times on how long a task took in a gradle build script? In an optimal case log the time directly same or next line to the tas

Answer 1

I have tried with @Jilevys solution but was getting error in finding the class org.gradle.util.Clock()

I have modified it to use Java8 classes. Put below code on top of the build.gradle

    import java.time.LocalDateTime

class TimingsListener implements TaskExecutionListener, BuildListener {
    private LocalDateTime taskStartTime

    @Override
    void beforeExecute(Task task) {
        taskStartTime = LocalDateTime.now();
    }

    @Override
    void afterExecute(Task task, TaskState taskState) {
        LocalDateTime taskEndTime = LocalDateTime.now();
        def seconds = Duration.between(taskStartTime, taskEndTime).toSeconds();
        task.project.logger.warn "${task.path} took ${seconds} seconds."
    }

    @Override
    void buildStarted(Gradle gradle) {
        project.logger.warn "Build started on "+LocalDateTime.now()
    }

    @Override
    void settingsEvaluated(Settings settings) {

    }

    @Override
    void projectsLoaded(Gradle gradle) {

    }

    @Override
    void projectsEvaluated(Gradle gradle) {

    }

    @Override
    void buildFinished(BuildResult result) {
        project.logger.warn "Build finished on "+LocalDateTime.now()

    }
}
gradle.addListener new TimingsListener()

It produces output similar to given below.

: took 10 seconds.