Ensure that all kotlin files have a license header

Author: pynicolas

.github/workflows/ci.yml

@@ -31,4 +31,4 @@ jobs:
             ${{ runner.os }}-gradle-
 
       - name: Build Debug APK
-        run: ./gradlew clean check assembleRelease --no-daemon
+        run: ./gradlew clean license check assembleRelease --no-daemon

LICENSE_HEADER

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */

build.gradle.kts

@@ -3,4 +3,23 @@ plugins {
     alias(libs.plugins.android.application) apply false
     alias(libs.plugins.kotlin.android) apply false
     alias(libs.plugins.kotlin.compose) apply false
-}
+    alias(libs.plugins.license)
+}
+
+license {
+    header = rootProject.file("LICENSE_HEADER")
+    exclude("**/*.xml")
+    //strictCheck = true
+    mapping("java", "SLASHSTAR_STYLE")
+    mapping("kt", "SLASHSTAR_STYLE")
+}
+
+// See https://github.com/hierynomus/license-gradle-plugin/issues/155
+tasks.register("licenseCheckForKotlin", com.hierynomus.gradle.license.tasks.LicenseCheck::class) {
+    source = fileTree(project.projectDir) { include("**/*.kt") }
+}
+tasks["license"].dependsOn("licenseCheckForKotlin")
+tasks.register("licenseFormatForKotlin", com.hierynomus.gradle.license.tasks.LicenseFormat::class) {
+    source = fileTree(project.projectDir) { include("**/*.kt") }
+}
+tasks["licenseFormat"].dependsOn("licenseFormatForKotlin")

gradle/libs.versions.toml

@@ -1,6 +1,7 @@
 [versions]
 agp = "8.9.2"
 kotlin = "2.1.0"
+license = "0.16.1"
 coreKtx = "1.16.0"
 junit = "4.13.2"
 junitVersion = "1.2.1"
@@ -50,4 +51,5 @@ assertj =  { group="org.assertj", name="assertj-core", version.ref = "assertj" }
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
+license =  { id = "com.github.hierynomus.license", version.ref = "license" }