Add configuration to disable unused license warnings

src/main/kotlin/app/cash/licensee/plugin.kt

@@ -51,6 +51,7 @@ class LicenseePlugin : Plugin<Project> {
       it.dependencyConfig.convention(extension.toDependencyTreeConfig())
       it.validationConfig.convention(extension.toLicenseValidationConfig())
       it.violationAction.convention(extension.violationAction)
+      it.unusedAction.convention(extension.unusedAction)
 
       it.outputDir.convention(
         project.extensions.getByType(ReportingExtension::class.java).baseDirectory.dir(

src/main/kotlin/app/cash/licensee/pluginExtension.kt

@@ -192,6 +192,28 @@ interface LicenseeExtension {
    */
   fun violationAction(level: ViolationAction)
 
+  /**
+   * Build behavior when a declared license is not found in any dependencies of the project.
+   *
+   * This is intended for the case where you have a restricted list of allowed licenses for your
+   * organisation, so you can simply list them all in the Licensee config block and not have to
+   * fish through unnecessary warnings in your Gradle logs.
+   *
+   * ```
+   * licensee {
+   *   unusedAction(IGNORE)
+   * }
+   * ```
+   *
+   * The default behavior is to [warn][UnusedAction.WARN].
+   *
+   * Note: Setting this to [ignore][UnusedAction.IGNORE] does not affect the contents of the
+   * `validation.txt` file which always contains all artifacts and their validation status.
+   *
+   * @see UnusedAction
+   */
+  fun unusedAction(level: UnusedAction)
+
   interface AllowUrlOptions {
     fun because(reason: String)
   }
@@ -213,6 +235,12 @@ enum class ViolationAction {
   IGNORE,
 }
 
+@Suppress("unused") // Public API.
+enum class UnusedAction {
+  WARN,
+  IGNORE,
+}
+
 internal abstract class IgnoredCoordinate : Named {
   abstract val ignoredDatas: MapProperty<String, IgnoredData>
 }
@@ -223,10 +251,12 @@ internal abstract class MutableLicenseeExtension : LicenseeExtension {
   internal abstract val allowedDependencies: MapProperty<DependencyCoordinates, Optional<String>>
   internal abstract val ignoredGroupIds: MapProperty<String, IgnoredData>
   internal abstract val ignoredCoordinates: NamedDomainObjectContainer<IgnoredCoordinate>
-
   internal abstract val violationAction: Property<ViolationAction>
+  internal abstract val unusedAction: Property<UnusedAction>
+
   init {
     violationAction.convention(ViolationAction.FAIL)
+    unusedAction.convention(UnusedAction.WARN)
   }
 
   fun toDependencyTreeConfig(): Provider<DependencyConfig> {
@@ -346,6 +376,10 @@ internal abstract class MutableLicenseeExtension : LicenseeExtension {
   override fun violationAction(level: ViolationAction) {
     violationAction.set(level)
   }
+
+  override fun unusedAction(level: UnusedAction) {
+    unusedAction.set(level)
+  }
 }
 
 private fun <T, L, R, V> Provider<T>.zip(left: Provider<L>, right: Provider<R>, merge: (T, L, R) -> V): Provider<V> {

src/main/kotlin/app/cash/licensee/task.kt

@@ -15,8 +15,8 @@
  */
 package app.cash.licensee
 
-import app.cash.licensee.ViolationAction.FAIL
-import app.cash.licensee.ViolationAction.IGNORE
+import app.cash.licensee.ViolationAction
+import app.cash.licensee.UnusedAction
 import java.io.File
 import java.io.Serializable
 import kotlinx.serialization.builtins.ListSerializer
@@ -39,6 +39,7 @@ import org.gradle.api.artifacts.result.ResolvedComponentResult
 import org.gradle.api.artifacts.result.ResolvedVariantResult
 import org.gradle.api.attributes.Attribute
 import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.logging.LogLevel
 import org.gradle.api.logging.LogLevel.ERROR
 import org.gradle.api.logging.LogLevel.INFO
 import org.gradle.api.logging.LogLevel.LIFECYCLE
@@ -65,6 +66,9 @@ abstract class LicenseeTask : DefaultTask() {
   @get:Input
   internal abstract val violationAction: Property<ViolationAction>
 
+  @get:Input
+  internal abstract val unusedAction: Property<UnusedAction>
+
   @get:Input
   internal abstract val coordinatesToPomInfo: MapProperty<DependencyCoordinates, PomInfo>
 
@@ -270,22 +274,27 @@ abstract class LicenseeTask : DefaultTask() {
     val validationReport = StringBuilder()
 
     val violationAction = violationAction.get()
-    val errorLevel = if (violationAction == IGNORE) INFO else ERROR
-    val warningLevel = if (violationAction == IGNORE) INFO else WARN
-    val lifecycleLevel = if (violationAction == IGNORE) INFO else LIFECYCLE
+    val violationErrorLevel = if (violationAction == ViolationAction.IGNORE) INFO else ERROR
+    val violationWarningLevel = if (violationAction == ViolationAction.IGNORE) INFO else WARN
+
+    val unusedAction = unusedAction.get()
+    val unusedErrorLevel = if (unusedAction == UnusedAction.IGNORE) INFO else ERROR
+    val unusedWarningLevel = if (unusedAction == UnusedAction.IGNORE) INFO else WARN
+
+    val lifecycleLevel = if (violationAction == ViolationAction.IGNORE) INFO else LIFECYCLE
 
-    fun logResult(configResult: ValidationResult, prefix: String = "") {
+    fun logResult(configResult: ValidationResult, error: LogLevel, warning: LogLevel, prefix: String = "") {
       when (configResult) {
         is ValidationResult.Error -> {
           val message = prefix + "ERROR: " + configResult.message
           validationReport.appendLine(message)
-          logger.log(errorLevel, message)
+          logger.log(error, message)
         }
 
         is ValidationResult.Warning -> {
           val message = prefix + "WARNING: " + configResult.message
           validationReport.appendLine(message)
-          logger.log(warningLevel, message)
+          logger.log(warning, message)
         }
 
         is ValidationResult.Info -> {
@@ -296,7 +305,7 @@ abstract class LicenseeTask : DefaultTask() {
       }
     }
     for (configResult in validationResult.configResults) {
-      logResult(configResult)
+      logResult(configResult, unusedErrorLevel, unusedWarningLevel)
     }
     if (validationResult.configResults.isNotEmpty() && validationResult.artifactResults.isNotEmpty()) {
       validationReport.appendLine()
@@ -320,15 +329,15 @@ abstract class LicenseeTask : DefaultTask() {
         logger.info(coordinateHeader)
       }
       for (result in results) {
-        logResult(result, prefix = " - ")
+        logResult(result, violationErrorLevel, violationWarningLevel, prefix = " - ")
       }
     }
 
     val validationReportFile = File(outputDir, "validation.txt")
     validationReportFile.parentFile.mkdirs()
     validationReportFile.writeText(validationReport.toString())
 
-    if (violationAction == FAIL && validationResult.containsErrors) {
+    if (violationAction == ViolationAction.FAIL && validationResult.containsErrors) {
       throw RuntimeException("Artifacts failed validation. See output above.")
     }
   }

src/test/fixtures/coordinate-allow-unused-ignored-kts/build.gradle.kts

@@ -0,0 +1,16 @@
+import app.cash.licensee.UnusedAction.IGNORE
+
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation("com.example:example:1.0.0")
+}
+
+licensee {
+  allowDependency("com.example", "example", "1.0.0")
+  allowDependency("com.example", "example2", "1.0.0")
+  unusedAction(IGNORE)
+}

src/test/fixtures/coordinate-allow-unused-ignored-kts/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,5 @@
+WARNING: Allowed dependency 'com.example:example2:1.0.0' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' is NOT allowed
+ - Coordinate version is allowed

src/test/fixtures/coordinate-allow-unused-ignored-kts/repo/com/example/example/1.0.0/example-1.0.0.pom

@@ -0,0 +1,12 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0.0</version>
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+</project>

src/test/fixtures/coordinate-allow-unused-ignored-kts/settings.gradle.kts

@@ -0,0 +1,7 @@
+pluginManagement {
+  includeBuild("../../test-build-logic")
+}
+
+plugins {
+  id("licenseeTests")
+}

src/test/fixtures/coordinate-allow-unused-ignored/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation 'com.example:example:1.0.0'
+}
+
+licensee {
+  allowDependency('com.example', 'example', '1.0.0')
+  allowDependency('com.example', 'example2', '1.0.0')
+  unusedAction("IGNORE")
+}

src/test/fixtures/coordinate-allow-unused-ignored/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,5 @@
+WARNING: Allowed dependency 'com.example:example2:1.0.0' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' is NOT allowed
+ - Coordinate version is allowed

src/test/fixtures/coordinate-allow-unused-ignored/repo/com/example/example/1.0.0/example-1.0.0.pom

@@ -0,0 +1,12 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0.0</version>
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+</project>

src/test/fixtures/coordinate-allow-unused-ignored/settings.gradle

@@ -0,0 +1,7 @@
+pluginManagement {
+  includeBuild("../../test-build-logic")
+}
+
+plugins {
+  id("licenseeTests")
+}

src/test/fixtures/coordinate-allow-unused-warn-kts/build.gradle.kts

@@ -0,0 +1,16 @@
+import app.cash.licensee.UnusedAction.WARN
+
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation("com.example:example:1.0.0")
+}
+
+licensee {
+  allowDependency("com.example", "example", "1.0.0")
+  allowDependency("com.example", "example2", "1.0.0")
+  unusedAction(WARN)
+}

src/test/fixtures/coordinate-allow-unused-warn-kts/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,5 @@
+WARNING: Allowed dependency 'com.example:example2:1.0.0' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' is NOT allowed
+ - Coordinate version is allowed

src/test/fixtures/coordinate-allow-unused-warn-kts/repo/com/example/example/1.0.0/example-1.0.0.pom

@@ -0,0 +1,12 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0.0</version>
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+</project>

src/test/fixtures/coordinate-allow-unused-warn-kts/settings.gradle.kts

@@ -0,0 +1,7 @@
+pluginManagement {
+  includeBuild("../../test-build-logic")
+}
+
+plugins {
+  id("licenseeTests")
+}

src/test/fixtures/coordinate-allow-unused-warn/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation 'com.example:example:1.0.0'
+}
+
+licensee {
+  allowDependency('com.example', 'example', '1.0.0')
+  allowDependency('com.example', 'example2', '1.0.0')
+  unusedAction("WARN")
+}

src/test/fixtures/coordinate-allow-unused-warn/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,5 @@
+WARNING: Allowed dependency 'com.example:example2:1.0.0' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' is NOT allowed
+ - Coordinate version is allowed

src/test/fixtures/coordinate-allow-unused-warn/repo/com/example/example/1.0.0/example-1.0.0.pom

@@ -0,0 +1,12 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0.0</version>
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+</project>

src/test/fixtures/coordinate-allow-unused-warn/settings.gradle

@@ -0,0 +1,7 @@
+pluginManagement {
+  includeBuild("../../test-build-logic")
+}
+
+plugins {
+  id("licenseeTests")
+}

src/test/fixtures/spdx-allow-unused-ignored/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation 'com.example:example:1.0.0'
+}
+
+licensee {
+  allow('Apache-2.0')
+  allow('MIT')
+  unusedAction("IGNORE")
+}

src/test/fixtures/spdx-allow-unused-ignored/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,4 @@
+WARNING: Allowed SPDX identifier 'MIT' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' allowed

src/test/fixtures/spdx-allow-unused-ignored/repo/com/example/example/1.0.0/example-1.0.0.pom

@@ -0,0 +1,12 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0.0</version>
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+</project>

src/test/fixtures/spdx-allow-unused-ignored/settings.gradle

@@ -0,0 +1,7 @@
+pluginManagement {
+  includeBuild("../../test-build-logic")
+}
+
+plugins {
+  id("licenseeTests")
+}

src/test/fixtures/spdx-allow-unused-warn/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+  id("java-library")
+  alias(libs.plugins.licensee)
+}
+
+dependencies {
+  implementation 'com.example:example:1.0.0'
+}
+
+licensee {
+  allow('Apache-2.0')
+  allow('MIT')
+  unusedAction("WARN")
+}

src/test/fixtures/spdx-allow-unused-warn/expected/build/reports/licensee/validation.txt

@@ -0,0 +1,4 @@
+WARNING: Allowed SPDX identifier 'MIT' is unused
+
+com.example:example:1.0.0
+ - SPDX identifier 'Apache-2.0' allowed