Gradle Task Tree

Gradle plugin that adds a taskTree task that prints task dependency tree report to the console.

The task dependency tree is printed with a similar format to that of the built-in dependencies task.

Installation

The plugin can be configured in the build script or in an init script.

The plugin is published on Gradle Plugin Portal.

Build Script Snippet

buildscript {
  repositories {
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }
  dependencies {
    classpath "gradle.plugin.com.dorongold.plugins:task-tree:1.5"
  }
}

apply plugin: "com.dorongold.task-tree"

Alternative Build Script Snippet (using the incubating "plugins" mechanism ):

plugins {
    id "com.dorongold.task-tree" version "1.5"
}

Init Script Snippet

To use this plugin in all your projects, put the following in a file named init.gradle in the $USER_HOME/.gradle/ directory, or any file ending in .gradle in the $USER_HOME/.gradle/init.d/ directory. See here for more information on initialization scripts.

initscript {
    repositories {
        maven { url "https://plugins.gradle.org/m2" }
    }
    dependencies {
	classpath "gradle.plugin.com.dorongold.plugins:task-tree:1.5"
    }
}
rootProject {
    apply plugin: com.dorongold.gradle.tasktree.TaskTreePlugin
}

Usage

gradle <task 1>...<task N> taskTree

When one of the tasks given to the gradle command is taskTree, execution of all the other tasks on that line is skipped. Instead, their task dependency tree is printed.

Examples

gradle build taskTree

:build
+--- :assemble
|    \--- :jar
|         \--- :classes
|              +--- :compileJava
|              \--- :processResources
\--- :check
     \--- :test
          +--- :classes
          |    +--- :compileJava
          |    \--- :processResources
          \--- :testClasses
               +--- :compileTestJava
               |    \--- :classes
               |         +--- :compileJava
               |         \--- :processResources
               \--- :processTestResources

gradle compileJava taskTree

:compileJava
No task dependencies

gradle taskTree javadoc test check

:javadoc
\--- :classes
     +--- :compileJava
     \--- :processResources

:test
+--- :classes
|    +--- :compileJava
|    \--- :processResources
\--- :testClasses
     +--- :compileTestJava
     |    \--- :classes
     |         +--- :compileJava
     |         \--- :processResources
     \--- :processTestResources

:check
\--- :test
     +--- :classes
     |    +--- :compileJava
     |    \--- :processResources
     \--- :testClasses
          +--- :compileTestJava
          |    \--- :classes
          |         +--- :compileJava
          |         \--- :processResources
          \--- :processTestResources

Configuration

When running the taskTree task from command-line, you can add the flag: --no-repeat.
This prevents sections of the tree from being printed more than once.
For a large task-tree it has the effect of reducing the size of output without loosing information.
To limit the depth of the printed tree add the command-line option: --task-depth <number>.

You may add a configuration block for taskTree in your build.gradle (or, in case you take the Init Script approach, your init.gradle). In the configuration block you can set:

• noRepeat = true has the same effect as passing --no-repeat to taskTree at command-line.
• impliesSubProjects = true in a multi-project, taskTree will print the task-tree of the current project only (the default is to print the task-tree of current and child projects). This can reduce the size of output.
• taskDepth = <number> e.g: taskDepth = 3 limits the depth of the printed tree.

//optional configuration
taskTree{
    noRepeat = true  //do not print a sub-tree in the task-tree more than once
    impliesSubProjects = true  //do not print task-tree for child projects in a multi-project
    taskDepth = 3 // limit tree depth to 3. Equivalent to running with the --task-depth option.
}

Note:

In a multi-project, it is recommended to apply the plugin on the root project only. The taskTree task will automatically be added to child projects.
I.e. it is unnecessary to apply this plugin under allprojects or subprojects.

Version Compatibility

Gradle 2.3+
Java 1.7+

Acknowledgements

Some functionality is based on gradle-visteg plugin - a plugin that creates an image with a DAG representation of the task tree.