Add build-plugin

build-plugin/build.gradle.kts

@@ -0,0 +1,11 @@
+plugins {
+    `kotlin-dsl`
+}
+
+dependencies {
+    implementation(files(libs.javaClass.superclass.protectionDomain.codeSource.location))
+}
+
+fun plugin(provider: Provider<PluginDependency>) = with(provider.get()) {
+    "$pluginId:$pluginId.gradle.plugin:$version"
+}

build-plugin/settings.gradle.kts

@@ -0,0 +1,21 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+
+dependencyResolutionManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+
+    versionCatalogs.create("libs") {
+        from(files("../gradle/libs.versions.toml"))
+    }
+}
+
+rootProject.name = "build-plugin"

build-plugin/src/main/kotlin/ProjectExtension.kt

@@ -0,0 +1,6 @@
+import org.gradle.accessors.dm.LibrariesForLibs
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.getByName
+
+val Project.libs: LibrariesForLibs
+    get() = extensions.getByName<LibrariesForLibs>("libs")

settings.gradle.kts

@@ -15,6 +15,8 @@ dependencyResolutionManagement {
     }
 }
 
+includeBuild("build-plugin")
+
 include(":app:k9mail")
 include(":app:ui:base")
 include(":app:ui:setup")