Maven: Make compiler plugin option reporting more user-friendly

libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/expected.log

@@ -1,15 +1,17 @@
 [INFO] Kotlin Compiler version @snapshot@
 [INFO] Compiling Kotlin sources from [/test-extension/src/main/kotlin]
 [INFO] Module name is test-extension
+[WARNING] Some JAR files in the classpath have the Kotlin Runtime library bundled into them. This may cause difficult to debug problems if there's a different version @snapshot@ the Kotlin Runtime library in the classpath. Consider removing these libraries from the classpath or use '-Xskip-runtime-version-check' to suppress this warning
+[WARNING] /local-repo/org/jetbrains/kotlin/kotlin-compiler/1.1-SNAPSHOT/kotlin-compiler-1.1-SNAPSHOT.jar: (-1, -1) Library has Kotlin runtime bundled into it
 [INFO] Kotlin Compiler version @snapshot@
 [WARNING] No sources found skipping Kotlin compile
 [INFO] Kotlin Compiler version @snapshot@
 [INFO] Compiling Kotlin sources from [/use-test-extension/src/main/kotlin]
 [INFO] Module name is use-test-extension
 [INFO] Applicability test for project use-test-extension
+[INFO] Applied plugin: 'test-me'
 [INFO] Configuring test plugin with arguments
-[INFO] Options for plugin test-me: [plugin:org.jetbrains.kotlin.test.test-plugin:test-option=my-special-value]
 [INFO] Plugin applied
 [INFO] Option value: my-special-value
 [INFO] Kotlin Compiler version @snapshot@
-[WARNING] No sources found skipping Kotlin compile
+[WARNING] No sources found skipping Kotlin compile

libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.jetbrains.kotlin</groupId>
     <artifactId>kotlin-compiler-extensions-test</artifactId>
-    <version>1.1-SNAPSHOT</version>
+    <version>1.0-SNAPSHOT</version>
     <modules>
         <module>test-extension</module>
         <module>use-test-extension</module>

libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/test-extension/pom.xml

@@ -5,16 +5,12 @@
     <parent>
         <artifactId>kotlin-compiler-extensions-test</artifactId>
         <groupId>org.jetbrains.kotlin</groupId>
-        <version>1.1-SNAPSHOT</version>
+        <version>1.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>test-extension</artifactId>
 
-    <properties>
-        <kotlin.version>1.1-SNAPSHOT</kotlin.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>

libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/test-extension/src/main/kotlin/org/jetbrains/kotlin/test/MavenPluginComponent.kt

@@ -23,6 +23,7 @@ class MavenPluginComponent : KotlinMavenPluginExtension {
         logger.info("Configuring test plugin with arguments")
 
         return listOf(PluginOption(
+                "test-me",
                 TestCommandLineProcessor.TestPluginId,
                 TestCommandLineProcessor.MyTestOption.name,
                 "my-special-value"))

libraries/tools/kotlin-maven-plugin-test/src/it/test-plugins/use-test-extension/pom.xml

@@ -5,17 +5,12 @@
     <parent>
         <artifactId>kotlin-compiler-extensions-test</artifactId>
         <groupId>org.jetbrains.kotlin</groupId>
-        <version>1.1-SNAPSHOT</version>
+        <version>1.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>use-test-extension</artifactId>
 
-
-    <properties>
-        <kotlin.version>1.1-SNAPSHOT</kotlin.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>

libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java

@@ -328,10 +328,13 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
             String pluginName = pluginEntry.getKey();
             KotlinMavenPluginExtension plugin = pluginEntry.getValue();
 
+            // applied plugin (...) to info()
             if (plugin.isApplicable(project, mojoExecution)) {
+                getLog().info("Applied plugin: '" + pluginName + "'");
                 List<PluginOption> optionsForPlugin = plugin.getPluginOptions(project, mojoExecution);
-                getLog().info("Options for plugin " + pluginName + ": " + optionsForPlugin);
-                pluginOptions.addAll(optionsForPlugin);
+                if (!optionsForPlugin.isEmpty()) {
+                    pluginOptions.addAll(optionsForPlugin);
+                }
             }
         }
 
@@ -339,6 +342,34 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
             pluginOptions.addAll(parseUserProvidedPluginOptions(this.pluginOptions, plugins));
         }
 
+        Map<String, List<PluginOption>> optionsByPluginName = new LinkedHashMap<String, List<PluginOption>>();
+        for (PluginOption option : pluginOptions) {
+            List<PluginOption> optionsForPlugin = optionsByPluginName.get(option.pluginName);
+            if (optionsForPlugin == null) {
+                optionsForPlugin = new ArrayList<PluginOption>();
+                optionsByPluginName.put(option.pluginName, optionsForPlugin);
+            }
+
+            optionsForPlugin.add(option);
+        }
+
+        for (Map.Entry<String, List<PluginOption>> entry : optionsByPluginName.entrySet()) {
+            assert !entry.getValue().isEmpty();
+
+            String pluginName = entry.getValue().get(0).pluginName;
+
+            StringBuilder renderedOptions = new StringBuilder("[");
+            for (PluginOption option : entry.getValue()) {
+                if (renderedOptions.length() > 1) {
+                    renderedOptions.append(", ");
+                }
+                renderedOptions.append(option.key).append(": ").append(option.value);
+            }
+            renderedOptions.append("]");
+
+            getLog().debug("Options for plugin " + pluginName + ": " + renderedOptions);
+        }
+
         return pluginOptions;
     }
 
@@ -363,7 +394,7 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
                 throw new PluginNotFoundException(pluginName);
             }
 
-            pluginOptions.add(new PluginOption(plugin.getCompilerPluginId(), key, value));
+            pluginOptions.add(new PluginOption(pluginName, plugin.getCompilerPluginId(), key, value));
         }
 
         return pluginOptions;

libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/PluginOption.java

@@ -1,11 +1,17 @@
 package org.jetbrains.kotlin.maven;
 
 public class PluginOption {
+    /** The plugin name in Maven, e.g. "all-open" */
+    public final String pluginName;
+
+    /** The compiler plugin identifier, e.g. "org.jetbrains.kotlin.allopen" */
     public final String pluginId;
+
     public final String key;
     public final String value;
 
-    public PluginOption(String pluginId, String key, String value) {
+    public PluginOption(String pluginName, String pluginId, String key, String value) {
+        this.pluginName = pluginName;
         this.pluginId = pluginId;
         this.key = key;
         this.value = value;