Adding gradle support

.gitignore

@@ -1 +1,8 @@
 /target
+.idea
+.settings
+.circleci
+mpl.iml
+.factorypath
+.gradle/**
+build/**

build.gradle

@@ -0,0 +1,80 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ */
+
+apply plugin: 'groovy'
+apply plugin: 'java'
+apply plugin: 'jacoco'
+
+repositories {
+    mavenCentral()
+    jcenter()
+    maven { url 'http://repo.jenkins-ci.org/releases/' }
+    maven { url 'http://repo.jenkins-ci.org/public/' }
+}
+
+dependencies {
+    compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '3.0.3'
+    compile group: 'com.cloudbees', name: 'groovy-cps', version: '1.24'
+    compile 'org.kohsuke.stapler:stapler:1.257.2@jar'
+    compile 'org.jenkins-ci.main:jenkins-core:2.107.3@jar'
+    compile 'org.jenkins-ci.plugins.workflow:workflow-api:2.40@jar'
+    compile 'org.jenkins-ci.plugins.workflow:workflow-basic-steps:2.20@jar'
+    compile 'org.jenkins-ci.plugins.workflow:workflow-cps:2.81@jar'
+    compile 'org.jenkins-ci.plugins.workflow:workflow-cps-global-lib:2.16@jar'
+    compile 'org.jenkins-ci.plugins.workflow:workflow-step-api:2.22@jar'
+    compile group: 'com.lesfurets', name: 'jenkins-pipeline-unit', version: '1.1'
+
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testCompile group: 'org.mockito', name: 'mockito-core', version: '2.+'
+}
+
+sourceSets {
+    main {
+        groovy {
+            // all code files will be in either of the folders
+            srcDirs = ['src', 'vars', 'resources']
+        }
+    }
+    test {
+        groovy {
+            srcDirs = ['test', 'src', 'resources', 'vars']
+        }
+    }
+}
+
+jacocoTestReport {
+    reports {
+        xml.enabled false
+        csv.enabled false
+        html.enabled true
+    }
+}
+
+group = 'com.griddynamics.devops'
+description = 'Modular Pipeline Library'
+sourceCompatibility = '1.8'
+
+task prepareForTests(type: Copy) {
+    from(projectDir) {
+        include 'src/**/*.*'
+        include 'vars/**/*.*'
+        include 'resources/**/*.*'
+        include 'build.gradle'
+        include 'settings.gradle'
+    }
+    // TODO: try to come up with a more elegant way of doing this - it's like that to avoid completely breaking maven support
+    into "${buildDir}/classes/groovy/test/${project.name}@snapshot"
+}
+
+test {
+    dependsOn prepareForTests
+    // using grape causes issues with missing classpaths
+    // as gradle does not use ivy by default.
+    systemProperty 'groovy.grape.enable', 'false'
+
+    // show more info on failing tests
+    testLogging {
+        exceptionFormat = 'full'
+    }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

resources/com/griddynamics/devops/mpl/modules/Build/Build.groovy

@@ -2,7 +2,11 @@
  * Common build module
  */
 
-MPLModule('Maven Build', CFG)
+if ( fileExists('build.gradle')) {
+  MPLModule('Gradle Build', CFG)
+} else {
+  MPLModule('Maven Build', CFG)
+}
 
 if( fileExists('openshift') ) {
   MPLModule('Openshift Build', CFG)