Using Gradle

Gradle is a build automation tool. It can automate build-related tasks such as:

• Running tests
• Managing library dependencies
• Analyzing code for style compliance
  

The gradle configuration for this project is defined in the build script build.gradle.

To learn more about gradle build scripts, read up on Build Scripts Basics.

Running Gradle Commands

To run a Gradle command, open a command window on the project folder and enter the Gradle command.
Gradle commands look like this:

• On Windows : gradlew <task1> <task2> ... e.g. gradlew clean allTests
• On Mac/Linux: ./gradlew <task1> <task2>... e.g. ./gradlew clean allTests
  

If you do not specify any tasks, Gradle will run the default tasks clean headless allTests coverage.

Cleaning the Project

• clean
  Deletes the files created during the previous build tasks (e.g. files in the build folder).
  e.g. ./gradlew clean
  

  Tip clean to force Gradle to execute a task:
  When running a Gradle task, Gradle will try to figure out if the task needs running at all. If Gradle determines that the output of the task will be same as the previous time, it will not run the task. For example, it will not build the JAR file again if the relevant source files have not changed since the last time the JAR file was built. If we want to force Gradle to run a task, we can combine that task with clean. Once the build files have been cleaned, Gradle has no way to determine if the output will be same as before, so it will be forced to execute the task.

Creating the JAR file

• shadowJar
  Creates the addressbook.jar file in the build/jar folder, if the current file is outdated.
  e.g. ./gradlew shadowJar
  

  To force Gradle to create the JAR file even if the current one is up-to-date, you can ‘clean’ first.
  e.g. ./gradlew clean shadowJar
  

Note: Why do we create a fat JAR?

If we package only our own class files into the JAR file, it will not work properly unless the user has all the other JAR files (i.e. third party libraries) our classes depend on, which is rather inconvenient. Therefore, we package all dependencies into a single JAR files, creating what is also known as a fat JAR file. To create a fat JAR fil, we use the Gradle plugin shadow jar.

Running the application

• run
  Builds and runs the application.

• runShadow
  Builds the application as a fat JAR, and then runs it.

Running code style checks

• checkstyleMain
  Runs the code style check for the main code base

• checkstyleTest
  Runs the code style check for the test code base

The set of code style rules implemented can be found in config/checkstyle/checkstyle.xml. To enable exceptions to code styles, add in the comment //CODESTYLE.OFF: RuleName at the start of the section and //CODESTYLE.ON: RuleName at the end of the section.

Running Tests

• allTests
  Runs all tests.

• guiTests
  Runs all tests in the guitests package

• nonGuiTests
  Runs all non-GUI tests in the seedu.address package

• headless
  Sets the test mode as headless. The mode is effective for that Gradle run only so it should be combined with other test tasks.

Here are some examples:

• ./gradlew headless allTests – Runs all tests in headless mode
• ./gradlew clean nonGuiTests – Cleans the project and runs non-GUI tests

Updating Dependencies

There is no need to run these Gradle tasks manually as they are called automatically by other relevant Gradle tasks.

• compileJava
  Checks whether the project has the required dependencies to compile and run the main program, and download any missing dependencies before compiling the classes.
  See build.gradle -> allprojects -> dependencies -> compile for the list of dependencies required.

• compileTestJava
  Checks whether the project has the required dependencies to perform testing, and download any missing dependencies before compiling the test classes.
  See build.gradle -> allprojects -> dependencies -> testCompile for the list of dependencies required.