don't crash if Anvil isn't in the buildScript classpath

This is something of a band-aid, because it means that if the plugin is only applied to a sub-project, it won't be parsed at all.

Author: RBusarow

modulecheck-gradle/plugin/src/main/kotlin/modulecheck/gradle/internal/GradleProjectProvider.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2022 Rick Busarow
+ * Copyright (C) 2021-2023 Rick Busarow
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -206,18 +206,25 @@ class GradleProjectProvider @Inject constructor(
     `kotlinCompilerPluginClasspathMain`, `kotlinCompilerPluginClasspathTest`, etc.
      */
     val version = configurations
-      .filter { it.name.startsWith("kotlinCompilerPluginClasspath") }
       .asSequence()
+      .filter { it.name.startsWith("kotlinCompilerPluginClasspath") }
       .flatMap { it.dependencies }
       .firstOrNull { it.group == "com.squareup.anvil" }
       ?.version
       ?.let { versionString -> SemVer.parse(versionString) }
       ?: return null
 
-    val enabled = extensions
-      .findByType(AnvilExtension::class.java)
-      ?.generateDaggerFactories
-      ?.get() == true
+    // TODO This is something of a band-aid, because it means that if the plugin is only applied to
+    //  a sub-project, it won't be parsed at all.  Anvil should probably be shaded, unless/until
+    //  classpath isolation with the Worker API is working.
+    @Suppress("SwallowedException")
+    val enabled = try {
+      extensions.findByType(AnvilExtension::class.java)
+        ?.generateDaggerFactories
+        ?.get() == true
+    } catch (e: NoClassDefFoundError) {
+      return null
+    }
 
     return AnvilGradlePlugin(version, enabled)
   }

modulecheck-gradle/plugin/src/test/kotlin/modulecheck/gradle/AnvilPluginParsingTest.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2021-2023 Rick Busarow
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package modulecheck.gradle
+
+import modulecheck.testing.replaceOrFail
+import org.junit.jupiter.api.TestFactory
+
+class AnvilPluginParsingTest : BaseGradleTest() {
+
+  @TestFactory
+  fun `anvil may be added to the root project buildScript classpath`() = anvil {
+    rootBuild {
+      DEFAULT_BUILD_FILE.replaceOrFail(
+        """(\s*buildscript\s*\{\s*dependencies\s*\{)(\s*)""".toRegex(),
+        "$1$2classpath(\"com.squareup.anvil:gradle-plugin:$anvilVersion\")$2"
+      )
+    }
+
+    kotlinProject(":lib1") {
+      buildFile {
+        """
+        plugins {
+          kotlin("jvm")
+          id("com.squareup.anvil")
+        }
+        """
+      }
+
+      addKotlinSource(
+        """
+          package com.modulecheck.lib1
+
+          class Lib1Class
+          """,
+        sourceDirName = "kotlin"
+      )
+    }
+
+    shouldSucceed("moduleCheck")
+  }
+
+  @TestFactory
+  fun `anvil may be added directly to a subproject only`() = anvil {
+
+    kotlinProject(":lib1") {
+      buildFile {
+        """
+        plugins {
+          kotlin("jvm")
+          id("com.squareup.anvil") version "$anvilVersion"
+        }
+        """
+      }
+
+      addKotlinSource(
+        """
+          package com.modulecheck.lib1
+
+          class Lib1Class
+          """,
+        sourceDirName = "kotlin"
+      )
+    }
+
+    shouldSucceed("moduleCheck")
+  }
+}

modulecheck-gradle/plugin/src/test/kotlin/modulecheck/gradle/TestVersions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2022 Rick Busarow
+ * Copyright (C) 2021-2023 Rick Busarow
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -71,6 +71,19 @@ interface VersionsMatrixTest : DynamicTests, ResetManager {
     )
   }
 
+  fun anvil(
+    filter: (String) -> Boolean = { true },
+    action: (String) -> Unit
+  ): List<DynamicTest> {
+
+    return anvilVersions.dynamic(
+      filter = { filter(this) },
+      testName = { "anvil $it" },
+      setup = { anvilVersion = it },
+      action = action
+    )
+  }
+
   fun kotlin(
     filter: (String) -> Boolean = { true },
     action: (String) -> Unit

modulecheck-internal-testing/src/main/kotlin/modulecheck/testing/FancyShould.kt

@@ -49,11 +49,21 @@ fun <T, U : T> T.trimmedShouldBe(expected: U?, vararg excludeFromStack: KClass<*
   }
 }
 
+/**
+ * returns the output of [assertion], or cleans up the stacktrace of any assertion errors before rethrowing
+ *
+ * @since 0.12.4
+ */
 fun <R> trimmedAssert(
   vararg excludeFromStack: KClass<*>,
   assertion: suspend () -> R
 ): R = Unit.trimmedAssert(*excludeFromStack) { assertion() }
 
+/**
+ * returns the output of [assertion], or cleans up the stacktrace of any assertion errors before rethrowing
+ *
+ * @since 0.12.4
+ */
 fun <T, R> T.trimmedAssert(
   vararg excludeFromStack: KClass<*>,
   assertion: suspend T.() -> R

modulecheck-internal-testing/src/main/kotlin/modulecheck/testing/asserts.kt

@@ -63,6 +63,7 @@ private fun assertChanged(
 ) = newString.also { new ->
   trimmedAssert {
 
+    @Suppress("MagicNumber")
     val tokenName = (if (token is Regex) "regex" else "oldValue").padStart(9)
 
     """