Add crossdoc conventions

build.gradle.kts

@@ -10,6 +10,7 @@ plugins {
 dependencies {
     api(libs.indra.common)
     api(libs.indra.publishing.sonatype)
+    api(libs.indra.crossdoc)
     api(libs.errorprone.gradle)
     api(libs.spotless)
     implementation(libs.palantir.baseline)

gradle/libs.versions.toml

@@ -8,6 +8,7 @@ spotless = "6.25.0"
 
 [libraries]
 indra-common = { module = "net.kyori:indra-common", version.ref = "indra" }
+indra-crossdoc = { module = "net.kyori:indra-crossdoc", version.ref = "indra" }
 indra-publishing-sonatype = { module = "net.kyori:indra-publishing-sonatype", version.ref = "indra" }
 errorprone-gradle = { module = "net.ltgt.gradle:gradle-errorprone-plugin", version.ref = "gradleErrorprone" }
 spotless = { module = "com.diffplug.spotless:spotless-plugin-gradle", version.ref = "spotless" }

src/main/kotlin/org/incendo/cloudbuildlogic/BasePlugin.kt

@@ -15,6 +15,7 @@ class BasePlugin : Plugin<Project> {
         target.plugins.apply("net.kyori.indra.checkstyle")
         target.plugins.apply(BaselineImmutables::class)
         target.plugins.apply(IncludeImmutablesSources::class)
+        target.plugins.apply(CrossdocConventions::class)
 
         target.extensions.configure(IndraExtension::class) {
             javaVersions {

src/main/kotlin/org/incendo/cloudbuildlogic/CrossdocConventions.kt

@@ -0,0 +1,22 @@
+package org.incendo.cloudbuildlogic
+
+import net.kyori.indra.crossdoc.CrossdocExtension
+import net.kyori.indra.crossdoc.CrossdocPlugin
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.apply
+import org.gradle.kotlin.dsl.getByType
+
+class CrossdocConventions : Plugin<Project> {
+    override fun apply(target: Project) {
+        target.plugins.withId("java-library") {
+            target.plugins.apply(CrossdocPlugin::class)
+
+            target.afterEvaluate {
+                target.extensions.getByType(CrossdocExtension::class).apply {
+                    baseUrl("https://javadoc.io/${target.group}/")
+                }
+            }
+        }
+    }
+}