From da4aec90cc8ea446a244e4757b6bab5cff5332de Mon Sep 17 00:00:00 2001
From: Guillermo Mazzola <gmazzo65@gmail.com>
Date: Sun, 7 Jan 2024 21:33:56 +0100
Subject: [PATCH] Task has `SKIPPED` state if there are no fields to generate

---
 .../gmazzo/buildconfig/BuildConfigTask.kt     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/plugin/src/main/kotlin/com/github/gmazzo/buildconfig/BuildConfigTask.kt b/plugin/src/main/kotlin/com/github/gmazzo/buildconfig/BuildConfigTask.kt
index 557df53..d0df70b 100644
--- a/plugin/src/main/kotlin/com/github/gmazzo/buildconfig/BuildConfigTask.kt
+++ b/plugin/src/main/kotlin/com/github/gmazzo/buildconfig/BuildConfigTask.kt
@@ -1,15 +1,20 @@
+@file:Suppress("LeakingThis")
+
 package com.github.gmazzo.buildconfig
 
 import com.github.gmazzo.buildconfig.generators.BuildConfigGenerator
 import com.github.gmazzo.buildconfig.generators.BuildConfigGeneratorSpec
 import org.gradle.api.DefaultTask
+import org.gradle.api.Task
 import org.gradle.api.file.DirectoryProperty
 import org.gradle.api.provider.Property
 import org.gradle.api.provider.SetProperty
+import org.gradle.api.specs.Spec
 import org.gradle.api.tasks.CacheableTask
 import org.gradle.api.tasks.Nested
 import org.gradle.api.tasks.OutputDirectory
 import org.gradle.api.tasks.TaskAction
+import org.gradle.util.GradleVersion
 import java.io.File
 
 @CacheableTask
@@ -24,6 +29,15 @@ abstract class BuildConfigTask : DefaultTask() {
     @get:OutputDirectory
     abstract val outputDir: DirectoryProperty
 
+    init {
+        if (GradleVersion.current() >= GradleVersion.version("7.6")) {
+            onlyIf("There are build config fields to generate", HasFields)
+
+        } else {
+            onlyIf(HasFields)
+        }
+    }
+
     @TaskAction
     fun generateBuildConfigFile() {
         val dir = outputDir.get().asFile
@@ -59,4 +73,9 @@ abstract class BuildConfigTask : DefaultTask() {
         }
     }
 
+    private object HasFields : Spec<Task> {
+        override fun isSatisfiedBy(task: Task): Boolean =
+            (task as BuildConfigTask).specs.get().any { fields -> fields.buildConfigFields.isNotEmpty() }
+    }
+
 }