From 77ca6176fd6bd42d2239f60912092ec482ad7fc4 Mon Sep 17 00:00:00 2001
From: Martin Bonnin <martin@mbonnin.net>
Date: Wed, 8 May 2024 00:08:32 +0200
Subject: [PATCH] Support configuration cache

---
 build.gradle.kts                              |  2 +-
 .../maven/sympathy/MavenSympathyPlugin.kt     |  1 -
 .../maven/sympathy/SympathyForMrMavenTask.kt  | 39 ++++++++++++-------
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/build.gradle.kts b/build.gradle.kts
index 99e4f86..16fc2e9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -23,7 +23,7 @@ gradlePlugin {
 }
 
 group = "com.gradleup.maven-sympathy"
-version = "0.0.1"
+version = "0.0.2"
 
 tasks.withType(JavaCompile::class.java) {
     options.release.set(8)
diff --git a/src/main/kotlin/com/gradleup/maven/sympathy/MavenSympathyPlugin.kt b/src/main/kotlin/com/gradleup/maven/sympathy/MavenSympathyPlugin.kt
index 1a487d6..a5fc102 100644
--- a/src/main/kotlin/com/gradleup/maven/sympathy/MavenSympathyPlugin.kt
+++ b/src/main/kotlin/com/gradleup/maven/sympathy/MavenSympathyPlugin.kt
@@ -8,7 +8,6 @@ class MavenSympathyPlugin: Plugin<Project> {
         val taskProvider = target.tasks.register("sympathyForMrMaven", SympathyForMrMaven::class.java) {
             it.group = "verification"
             it.description = "Checks that your project dependencies play nice with Maven resolution strategy. See https://jakewharton.com/nonsensical-maven-is-still-a-gradle-problem/ for more details."
-            it.configurations = target.project.configurations
         }
 
         target.tasks.named("check") {
diff --git a/src/main/kotlin/com/gradleup/maven/sympathy/SympathyForMrMavenTask.kt b/src/main/kotlin/com/gradleup/maven/sympathy/SympathyForMrMavenTask.kt
index e8f1b3e..5adbb6b 100644
--- a/src/main/kotlin/com/gradleup/maven/sympathy/SympathyForMrMavenTask.kt
+++ b/src/main/kotlin/com/gradleup/maven/sympathy/SympathyForMrMavenTask.kt
@@ -6,29 +6,44 @@ import org.gradle.api.artifacts.ConfigurationContainer
 import org.gradle.api.artifacts.component.ModuleComponentSelector
 import org.gradle.api.artifacts.result.ResolvedComponentResult
 import org.gradle.api.artifacts.result.ResolvedDependencyResult
-import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.TaskAction
+import org.gradle.internal.serialization.Cached
 import org.gradle.work.DisableCachingByDefault
 
 @DisableCachingByDefault
 abstract class SympathyForMrMaven : DefaultTask() {
-    @get:Internal
-    abstract var configurations: ConfigurationContainer
+    private val model = Cached.of(::calculateReport)
 
     @TaskAction
     fun taskAction() {
-        configurations.filter {
+        var fail = false
+        model.get().upgrades.forEach {
+            logger.error("e: direct dependency ${it.requested} of configuration '${it.configuration}' was changed to ${it.selectedVersion}")
+            fail = true
+        }
+        if (fail) {
+            throw IllegalStateException("Declared dependencies were upgraded transitively. See task output above. Please update their versions.")
+        }
+    }
+
+    class Upgrade(val configuration: String, val requested: String, val selectedVersion: String)
+    class Report(val upgrades: List<Upgrade>)
+
+    private fun calculateReport(): Report {
+        return project.configurations.filter {
             it.isCanBeResolved
-        }.forEach {
-            checkConfiguration(it)
+        }.flatMap {
+            findUpgrades(it)
+        }.let {
+            Report(it)
         }
     }
 
     /**
      * See https://jakewharton.com/nonsensical-maven-is-still-a-gradle-problem/
      */
-    private fun checkConfiguration(configuration: Configuration) {
-        var fail = false
+    private fun findUpgrades(configuration: Configuration): List<Upgrade> {
+        val upgrades = mutableListOf<Upgrade>()
         val root = configuration.incoming.resolutionResult.rootComponent.get()
         (root as ResolvedComponentResult).dependencies.forEach {
             if (it is ResolvedDependencyResult) {
@@ -39,14 +54,12 @@ abstract class SympathyForMrMaven : DefaultTask() {
                     val requestedVersion = requested.version
                     val selectedVersion = selected.moduleVersion?.version
                     if (requestedVersion != selectedVersion) {
-                        logger.error("e: ${rdr.requested} changed to $selectedVersion")
-                        fail = true
+                        upgrades.add(Upgrade(configuration.name, rdr.requested.toString(), selectedVersion.toString()))
                     }
                 }
             }
         }
-        if (fail) {
-            throw IllegalStateException("Declared dependencies were upgraded transitively. See task output above. Please update their versions.")
-        }
+
+        return upgrades
     }
 }
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