Initial git info work

Add Jenkinsfile and use Gradle 7.0.2
Licenser currently doesn't have a functional release for Gradle 7.1

Author: SizableShrimp

.gitignore

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+# gradle
+.gradle
+build
+repo
+
+# eclipse
+.settings
+.metadata
+.classpath
+.project
+bin
+
+# intellij
+out
+*.idea
+*.iml
+
+# src
+src/main/groovy/**/*.groovy

HEADER

@@ -0,0 +1,17 @@
+${name}
+Copyright (C) ${year} ${fullname}
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+USA

Jenkinsfile

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+@Library('forge-shared-library')_
+
+pipeline {
+    agent {
+        docker {
+            image 'gradle:jdk8'
+            args '-v forgespigc:/home/gradle/.gradle/'
+        }
+    }
+    environment {
+        GRADLE_ARGS = '-Dorg.gradle.daemon.idletimeout=5000'
+        DISCORD_WEBHOOK = credentials('forge-discord-jenkins-webhook')
+        DISCORD_PREFIX = "Job: GradleUtils Branch: ${BRANCH_NAME} Build: #${BUILD_NUMBER}"
+        JENKINS_HEAD = 'https://wiki.jenkins-ci.org/download/attachments/2916393/headshot.png'
+    }
+
+    stages {
+        stage('notify_start') {
+            when {
+                not {
+                    changeRequest()
+                }
+            }
+            steps {
+                discordSend(
+                    title: "${DISCORD_PREFIX} Started",
+                    successful: true,
+                    result: 'ABORTED', //White border
+                    thumbnail: JENKINS_HEAD,
+                    webhookURL: DISCORD_WEBHOOK
+                )
+            }
+        }
+        stage('buildandtest') {
+            steps {
+                sh './gradlew ${GRADLE_ARGS} --refresh-dependencies --continue build test'
+                script {
+                    gradleVersion(this)
+                }
+            }
+        }
+        stage('publish') {
+            when {
+                not {
+                    changeRequest()
+                }
+            }
+            steps {
+                withCredentials([usernamePassword(credentialsId: 'maven-forge-user', usernameVariable: 'MAVEN_USER', passwordVariable: 'MAVEN_PASSWORD')]) {
+                    withGradle {
+                        sh './gradlew ${GRADLE_ARGS} publish'
+                    }
+                }
+            }
+            post {
+                success {
+                    build job: 'filegenerator', parameters: [string(name: 'COMMAND', value: "promote ${env.MYGROUP}:${env.MYARTIFACT} ${env.MYVERSION} latest")], propagate: false, wait: false
+                }
+            }
+        }
+    }
+    post {
+        always {
+            script {
+                if (env.CHANGE_ID == null) { // This is unset for non-PRs
+                    discordSend(
+                        title: "${DISCORD_PREFIX} Finished ${currentBuild.currentResult}",
+                        description: '```\n' + getChanges(currentBuild) + '\n```',
+                        successful: currentBuild.resultIsBetterOrEqualTo("SUCCESS"),
+                        result: currentBuild.currentResult,
+                        thumbnail: JENKINS_HEAD,
+                        webhookURL: DISCORD_WEBHOOK
+                    )
+                }
+            }
+        }
+    }
+}

build.gradle

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+import net.minecraftforge.gradleutils.GradleUtils
+
+plugins {
+    id 'groovy'
+    id 'maven-publish'
+}
+
+ext {
+    GIT_INFO = GradleUtils.gitInfo(file('.'))
+}
+
+group 'net.minecraftforge'
+version GradleUtils.getSimpleVersion(GIT_INFO)
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.codehaus.groovy:groovy-all:3.0.5'
+    implementation 'org.eclipse.jgit:org.eclipse.jgit:5.10.0.202012080955-r'
+}
+
+task copyGradleUtils(type: Sync) {
+    outputs.upToDateWhen { false }
+    into 'src/main/groovy'
+    from('buildSrc/src/main/groovy') {
+        include '**/*.groovy'
+    }
+}
+
+compileGroovy.dependsOn(copyGradleUtils)
+
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            from components.java
+
+            pom {
+                name = 'Gradle Utils'
+                description = 'Used by MinecraftForge projects as a util library for Gradle buildscripts'
+                url = 'https://github.com/MinecraftForge/GradleUtils'
+                scm {
+                    url = 'https://github.com/MinecraftForge/GradleUtils'
+                    connection = 'scm:git:git://github.com/MinecraftForge/GradleUtils.git'
+                    developerConnection = 'scm:git:[email protected]:MinecraftForge/GradleUtils.git'
+                }
+                issueManagement {
+                    system = 'github'
+                    url = 'https://github.com/MinecraftForge/GradleUtils/issues'
+                }
+
+                licenses {
+                    license {
+                        name = 'LGPLv2.1'
+                        url = 'https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt'
+                    }
+                }
+
+                developers {
+                    developer {
+                        id = 'LexManos'
+                        name = 'Lex Manos'
+                    }
+                    developer {
+                        id = 'SizableShrimp'
+                        name = 'SizableShrimp'
+                    }
+                }
+            }
+        }
+    }
+    repositories {
+        maven {
+            if (System.env.MAVEN_USER) {
+                url 'https://maven.minecraftforge.net/'
+                authentication {
+                    basic(BasicAuthentication)
+                }
+                credentials {
+                    username = System.env.MAVEN_USER ?: 'not'
+                    password = System.env.MAVEN_PASSWORD ?: 'set'
+                }
+            } else {
+                url 'file://' + rootProject.file('repo').getAbsolutePath()
+            }
+        }
+    }
+}

buildSrc/build.gradle

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+plugins {
+    id 'org.cadixdev.licenser' version '0.5.0'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.eclipse.jgit:org.eclipse.jgit:5.10.0.202012080955-r'
+}
+
+license {
+    header = new File(projectDir.parentFile, 'HEADER')
+    ext {
+        name = 'GradleUtils'
+        year = 2021
+        fullname = 'Forge Development LLC'
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/gradleutils/GradleUtils.groovy

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+/*
+ * GradleUtils
+ * Copyright (C) 2021 Forge Development LLC
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+ * USA
+ */
+
+package net.minecraftforge.gradleutils
+
+import org.eclipse.jgit.api.Git
+import org.eclipse.jgit.errors.RepositoryNotFoundException
+import org.eclipse.jgit.lib.ObjectId
+import org.eclipse.jgit.lib.Repository
+
+class GradleUtils {
+    static {
+        String.metaClass.rsplit = { String del, int limit = -1 ->
+            def lst = new ArrayList()
+            def x = 0, idx
+            def tmp = delegate
+            while ((idx = tmp.lastIndexOf(del)) != -1 && (limit == -1 || x++ < limit)) {
+                lst.add(0, tmp.substring(idx + del.length(), tmp.length()))
+                tmp = tmp.substring(0, idx)
+            }
+            lst.add(0, tmp)
+            return lst
+        }
+    }
+
+    static gitInfo(dir) {
+        def git = null
+        try {
+            git = Git.open(dir)
+        } catch (RepositoryNotFoundException e) {
+            return [
+                    tag: '0.0',
+                    offset: '0',
+                    hash: '00000000',
+                    branch: 'master',
+                    commit: '0000000000000000000000',
+                    abbreviatedId: '00000000'
+            ]
+        }
+        def desc = git.describe().setLong(true).setTags(true).call().rsplit('-', 2)
+        def head = git.repository.exactRef('HEAD')
+        def longBranch = head.symbolic ? head?.target?.name : null // matches Repository.getFullBranch() but returning null when on a detached HEAD
+
+        def ret = [:]
+        ret.tag = desc[0]
+        ret.offset = desc[1]
+        ret.hash = desc[2]
+        ret.branch = longBranch != null ? Repository.shortenRefName(longBranch) : null
+        ret.commit = ObjectId.toString(head.objectId)
+        ret.abbreviatedId = head.objectId.abbreviate(8).name()
+
+        return ret
+    }
+
+    static String getSimpleVersion(info) {
+        return "${info.tag}.${info.offset}"
+    }
+}

gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists