From 3b47ec75bbd201e5f3f0ee6485a060fe3efee5f4 Mon Sep 17 00:00:00 2001
From: Logan Gorence <logan@gorence.io>
Date: Wed, 22 Dec 2021 06:55:47 +0000
Subject: [PATCH] Initial update manifest generation.

---
 .gitlab-ci.yml   |  3 ++-
 build.gradle.kts | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a46dae5..6b6f795 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ variables:
 
 build:
   stage: build
-  script: gradle --build-cache shadowJar
+  script: gradle --build-cache assemble
   cache:
     key: "$CI_COMMIT_REF_NAME"
     policy: push
@@ -14,4 +14,5 @@ build:
       - .gradle
   artifacts:
     paths:
+      - "build/manifests/update.json"
       - "**/build/libs/*-plugin.jar"
diff --git a/build.gradle.kts b/build.gradle.kts
index 2b18632..ba359e5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,4 +1,6 @@
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import org.jetbrains.kotlin.com.google.gson.Gson
+import java.io.FileWriter
 
 plugins {
   java
@@ -24,6 +26,40 @@ allprojects {
   }
 }
 
+val manifestsDir = buildDir.resolve("manifests")
+manifestsDir.mkdirs()
+val gson = Gson()
+
+tasks.create("updateManifests") {
+  // TODO: not using task dependencies, outputs, blah blah blah.
+  doLast {
+    val updateFile = manifestsDir.resolve("update.json")
+    val writer = FileWriter(updateFile)
+    writer.use {
+      val rootPath = rootProject.rootDir.toPath()
+      val updateManifest = subprojects.mapNotNull { project ->
+        val files = project.tasks.getByName("shadowJar").outputs
+        val paths = files.files.map { rootPath.relativize(it.toPath()).toString() }
+
+        if (paths.isNotEmpty()) project.name to mapOf(
+          "version" to project.version,
+          "artifacts" to paths,
+        )
+        else null
+      }.toMap()
+
+      gson.toJson(
+        updateManifest,
+        writer
+      )
+    }
+  }
+}
+
+tasks.assemble {
+  dependsOn("updateManifests")
+}
+
 subprojects {
   plugins.apply("org.jetbrains.kotlin.jvm")
   plugins.apply("org.jetbrains.kotlin.plugin.serialization")
@@ -70,4 +106,8 @@ subprojects {
   tasks.withType<ShadowJar> {
     archiveClassifier.set("plugin")
   }
+
+  tasks.assemble {
+    dependsOn("shadowJar")
+  }
 }