mada-style-gradle

A Gradle plugin that enables and configures a number of code style and quality plugins for java development.

This plugin is a low-friction way of improving you code quality:

• enables a range of plugins with no clutter added to the build file (assuming the convention configurations are agreeable)
• configured entirely via entries in gradle.properties, so disabling/removing the plugin does not break the build file

Using the Plugin

Add plugin activation to the build file header (substitute the relevant version):

plugins {
    ...
    id 'dk.mada.style' version '1.n.n'
}

And make sure the plugin can be fetched from MavenCentral:

pluginManagement {
    repositories {
        gradlePluginPortal()
        mavenCentral()
    }
}

Null-checking

For null-checker annotations, you should add the JSpecify dependency:

compileOnly    "org.jspecify:jspecify:1.0.0"

Note that the annotations are not as easy to remove as the plugin (since they will be spread out over various source files).

Removing the Plugin

Just remove the apply-line in build.gradle to disable or remove all plugin activity.

Remove all the dk.mada.style.-prefixed entries in gradle.properties if you want to the remove the plugin for good.

Sub-plugins

• Checkstyle: Style checking framework
• ErrorProne: Error checking framework
• NullAway: ErrorProne plugin
• Sonar: SonarScanner
• Spotless: Enforces the eclipse-base dk.mada code formatter

Configuration

Properties in gradle.properties allow configuration of the sub-plugins.

Using properties (instead of DSL) allows the plugin (and sub-plugins) to be removed without breaking the build. (Assuming that you do not add sub-plugin DSL configuration elements to the build file.)

The options are (shows here with their default value).

Checkstyle

By default uses this configuration and these suppressions

• dk.mada.style.checkstyle.enabled = true
  Boolean flag allowing the checkstyle checker to be disabled
• dk.mada.style.checkstyle.includes =
  Comma-separated Ant-style include patterns for files to check
• dk.mada.style.checkstyle.excludes =
  Comma-separated Ant-style exclude patterns for files to not check
• dk.mada.style.checkstyle.ignore-generated-source = false
  Boolean flag to control scanning of test source files
• dk.mada.style.checkstyle.ignore-test-source = false
  Boolean flag to control scanning of generated source files
• dk.mada.style.checkstyle.config-path = null
  Optional path to an alternative checkstyle configuration file
  This can be a URL; the content will be downloaded and cached (so if you want to update the content, you must change the URL) Note that the configDir is set to the folder where the mada config and suppressions files are stored.

The suppressions file is hardwired for now, matching files dk/.*/(accept|fixture|unit)/.*java and checks (Javadoc|LineLength|MagicNumber).

ErrorProne

• dk.mada.style.errorprone.enabled = true
  Boolean flag allowing the error prone checker to be disabled
• dk.mada.style.errorprone.ignore-generated-source = false
  Boolean flag to control scanning of generated source files
  Note: works poorly with Immutable generated sources (as they cannot be referenced from the main sources when enabled)
• dk.mada.style.errorprone.ignore-test-source = false
  Boolean flag to control scanning of test source files
• dk.mada.style.errorprone.excluded-paths-regexp =
  Optional regular expression used to exclude files from scanning

Formatter (Spotless)

By default uses this configuration

• dk.mada.style.formatter.enabled = true
  Boolean flag allowing the formatter to be disabled
• dk.mada.style.formatter.include = src/main/java/**/*.java, src/test/java/**/*.java
  Comma-separated Ant-style include patterns for files to format
• dk.mada.style.formatter.exclude =
  Comma-separated Ant-style exclude patterns for files to not format
• dk.mada.style.formatter.eclipse-config-path = null
  Optional path to an alternative eclipse formatter configuration file This can be a URL; the content will be downloaded and cached (so if you want to update the content, you must change the URL)
• dk.mada.style.formatter.eclipse-432-p2-url = null Optional URL to a P2 update repository containing Eclipse 4.32 (aka 2024.06) plugins.

Null-checker

Note that this is a plugin to ErrorProne, so is also affected by errorprone configuration keys.

• dk.mada.style.null-checker.enabled = true
  Boolean flag allowing the null-checker to be disabled
• dk.mada.style.null-checker.include-packages = dk
  Comma-separated list of packages to be scanned (will include sub-packages)
• dk.mada.style.null-checker.exclude-packages =
  Comma-separated list of packages to be excluded from scanning
• dk.mada.style.null-checker.exclude-field-annotations = javafx.fxml.FXML, org.junit.jupiter.api.io.TempDir
  Comma-separated list of classes that are assumed to inject (non-null) value into fields

Sonar

All properties (except enabled) are simply passed on to the Sonar plugin, thus allowing configuration without DSL.

• dk.mada.style.sonar.enabled = true
  Boolean flag allowing sonar to be disabled
• dk.mada.style.sonar.host.url = https://sonarcloud.io
  The sonar cloud host address
• dk.mada.style.sonar.sourceEncoding = UTF-8
  The source encoding

Development

For testing snapshot builds in other projects:

$ ./gradlew -t publishToMavenLocal -Pversion=0.0.1