Run checkstyle checks in workflow

Author: AB-xdev

.config/checkstyle/checkstyle.xml

@@ -9,7 +9,7 @@
 	<property name="tabWidth" value="4"/>
 
 	<module name="SuppressionFilter">
-		<property name="file" value=".config/checkstyle/suppressions.xml"/>
+		<property name="file" value="${config_loc}/suppressions.xml"/>
 	</module>
 
 	<module name="FileLength"/>

.github/workflows/checkBuild.yml

@@ -64,3 +64,24 @@ jobs:
         name: plugin-files-java-${{ matrix.java }}
         path: build/libs/intellij-plugin-save-actions-*.jar
         if-no-files-found: error
+
+  code-style:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [17]
+        distribution: [temurin]
+
+    steps:
+    - uses: actions/checkout@v4
+      
+    - name: Set up JDK
+      uses: actions/setup-java@v4
+      with:
+        distribution: ${{ matrix.distribution }}
+        java-version: ${{ matrix.java }}
+        cache: 'gradle'
+
+    - name: Run Checkstyle
+      run: ./gradlew checkstyleMain checkstyleTest -PcheckstyleEnabled=true

build.gradle

@@ -1,10 +1,15 @@
 plugins {
     id 'java'
     id 'idea'
+    id 'checkstyle'
     id 'org.jetbrains.intellij' version '1.17.1'
     id 'org.sonarqube' version '4.4.1.3373'
 }
 
+ext {
+    checkstyleVersion = '10.13.0'
+}
+
 def properties(String key) {
     return providers.gradleProperty(key)
 }
@@ -15,6 +20,7 @@ def environment(String key) {
 
 apply plugin: 'org.jetbrains.intellij'
 apply plugin: 'java'
+apply plugin: 'checkstyle'
 
 // Add plugin group and version
 group = properties("pluginGroup").get()
@@ -25,8 +31,16 @@ repositories {
     mavenCentral()
 }
 
+// https://github.com/gradle/gradle/issues/27035
+configurations.checkstyle {
+    resolutionStrategy.capabilitiesResolution.withCapability("com.google.collections:google-collections") {
+        select("com.google.guava:guava:0")
+    }
+}
+
 // Add dependencies to test, junit5 api (annotations) and engine (runtime)
 dependencies {
+    checkstyle "com.puppycrawl.tools:checkstyle:${checkstyleVersion}"
     testImplementation platform('org.junit:junit-bom:5.10.2'),
             'org.junit.jupiter:junit-jupiter',
             'org.junit.jupiter:junit-jupiter-engine',
@@ -57,6 +71,17 @@ listProductsReleases {
     sinceBuild = "223.*"
 }
 
+checkstyle {
+    configDirectory = file("$rootProject.projectDir/.config/checkstyle")
+    ignoreFailures false
+    showViolations true
+    toolVersion = checkstyleVersion
+}
+
+tasks.withType(Checkstyle).configureEach {
+    enabled = project.hasProperty("checkstyleEnabled");
+}
+
 // Configure compileJava AND compileTestJava
 // https://docs.gradle.org/current/dsl/org.gradle.api.tasks.compile.JavaCompile.html
 tasks.withType(JavaCompile).configureEach {