[gradle] Add spotless plugin

Makefile

@@ -1,7 +1,7 @@
 GRADLE ?= ./gradlew
 
 .PHONY: all
-all: check jacocoRootReport javadocAll sinttest
+all: check format jacocoRootReport javadocAll sinttest
 
 .PHONY: codecov
 codecov:
@@ -12,6 +12,10 @@ codecov:
 check:
 	$(GRADLE) $@
 
+.PHONY: format
+format:
+	$(GRADLE) spotlessApply
+
 .PHONY: eclipse
 eclipse:
 	$(GRADLE) $@

build-logic/build.gradle

@@ -12,4 +12,5 @@ dependencies {
 	implementation "net.ltgt.gradle:gradle-errorprone-plugin:4.0.1"
 	implementation "gradle.plugin.org.kt3k.gradle.plugin:coveralls-gradle-plugin:2.12.2"
 	implementation "ru.vyarus:gradle-animalsniffer-plugin:1.7.1"
+	implementation "com.diffplug.spotless:spotless-plugin-gradle:7.0.0.BETA2"
 }

build-logic/src/main/groovy/org.igniterealtime.smack.java-common-conventions.gradle

@@ -11,6 +11,7 @@ plugins {
 	id 'maven-publish'
 	id 'net.ltgt.errorprone'
 	id 'signing'
+	id 'com.diffplug.spotless'
 
 	id 'jacoco-report-aggregation'
 	id 'test-report-aggregation'
@@ -335,6 +336,13 @@ coveralls {
 	jacocoReportPath 'build/reports/jacoco/testCodeCoverageReport/testCodeCoverageReport.xml'
 }
 
+spotless {
+	java {
+		eclipse().configFile("${rootDir}/resources/eclipse/smack_formatter.xml")
+		importOrderFile("${rootDir}/resources/eclipse/smack.importorder")
+	}
+}
+
 def getGitCommit() {
 	def projectDirFile = new File("$projectDir")