Set up Hangar publishing

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Publish to Hangar
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish:
+    if: github.repository_owner == 'ViaVersion'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: Set up JDK 8
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: 8
+          check-latest: true
+      - name: Publish
+        env:
+          HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+        run: ./gradlew build publishAllPublicationsToHangar

build.gradle

@@ -1,6 +1,9 @@
+import io.papermc.hangarpublishplugin.model.Platforms
+
 plugins {
     id "java-library"
     id "maven-publish"
+    id "io.papermc.hangar-publish-plugin" version "0.1.0"
 }
 
 repositories {
@@ -55,3 +58,54 @@ tasks.withType(JavaCompile) {
 tasks.withType(Javadoc) {
     options.encoding = "UTF-8"
 }
+
+// -----------------------------------------------------
+// Publishing
+
+def latestCommitHash() {
+    def byteOut = new ByteArrayOutputStream()
+    exec {
+        commandLine 'git', 'rev-parse', '--short', 'HEAD'
+        standardOutput = byteOut
+    }
+    return byteOut.toString('UTF-8').trim()
+}
+
+def latestCommitMessage() {
+    def byteOut = new ByteArrayOutputStream()
+    exec {
+        commandLine 'git', 'log', '-1', '--pretty=%B'
+        standardOutput = byteOut
+    }
+    return byteOut.toString('UTF-8').trim()
+}
+
+def baseVersion = project.maven_version
+def isRelease = !baseVersion.contains('-')
+def suffixedVersion = isRelease ? baseVersion : baseVersion + "+" + System.getenv("GITHUB_RUN_NUMBER")
+def commitHash = latestCommitHash()
+def changelogContent = "[${commitHash}](https://github.com/ViaVersion/iaRewind-Legacy-Support/commit/${commitHash}) ${latestCommitMessage()}"
+hangarPublish {
+    publications.register("plugin") {
+        version.set(suffixedVersion)
+        id.set("ViaRewindLegacySupport")
+        channel.set(isRelease ? "Release" : "Snapshot")
+        changelog.set(changelogContent)
+        apiKey.set(System.getenv("HANGAR_TOKEN"))
+        platforms {
+            register(Platforms.PAPER) {
+                jar.set(tasks.jar.archiveFile)
+                platformVersions.set([property('mcVersionRange') as String])
+                dependencies.hangar("ViaVersion") {
+                    required.set(true)
+                }
+                dependencies.hangar("ViaBackwards") {
+                    required.set(false)
+                }
+                dependencies.hangar("ViaRewind") {
+                    required.set(false)
+                }
+            }
+        }
+    }
+}

gradle.properties

@@ -6,3 +6,5 @@ org.gradle.parallel=true
 # project
 maven_version=1.5.0-SNAPSHOT
 maven_group=com.viaversion
+
+mcVersionRange=1.8-1.20.2