Add blocking "hot-reload" goal

pom.xml

@@ -321,6 +321,11 @@ under the License.
       <artifactId>plexus-i18n</artifactId>
       <version>1.1.0</version>
     </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-interactivity-api</artifactId>
+      <version>1.3</version>
+    </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>

src/it/projects/hot-reload/invoker.properties

@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+# executes in non-interactive/batch mode so hot-reload completes after initial render
+invoker.goals = site:hot-reload -DgenerateReports=false -B

src/it/projects/hot-reload/pom.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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.
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.plugins.site.its</groupId>
+  <artifactId>hot-reload</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>hot-reload IT</name>
+  <description>Integration test for the hot-reload goal</description>
+
+  <properties>
+    <fluidoSkinVersion>@fluidoSkinVersion@</fluidoSkinVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-site-plugin</artifactId>
+        <version>@project.version@</version>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/projects/hot-reload/src/site/markdown/test.md

@@ -0,0 +1,22 @@
+<!---
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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.
+-->
+
+# Hot Reload Test
+
+This is a test page for the hot-reload goal.

src/it/projects/hot-reload/src/site/site.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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.
+-->
+
+<site xmlns="http://maven.apache.org/SITE/2.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/SITE/2.0.0 https://maven.apache.org/xsd/site-2.0.0.xsd"
+  name="${project.name}">
+  <skin>
+    <groupId>org.apache.maven.skins</groupId>
+    <artifactId>maven-fluido-skin</artifactId>
+    <version>${fluidoSkinVersion}</version>
+  </skin>
+
+  <body>
+    <menu ref="reports"/>
+  </body>
+</site>

src/it/projects/hot-reload/verify.groovy

@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+// Check that the site output directory exists
+File target = new File( basedir, 'target/site' );
+assert target.isDirectory() : "target/site directory should exist";
+
+// Check that the rendered markdown page exists
+File testPage = new File( target, 'test.html' );
+assert testPage.isFile() : "test.html should have been rendered from test.md";
+
+// Check that the rendered page contains expected content
+String content = testPage.text;
+assert content.contains( 'Hot Reload Test' ) : "test.html should contain 'Hot Reload Test'";

src/main/java/org/apache/maven/plugins/site/render/AbstractSiteRenderingMojo.java

@@ -59,8 +59,6 @@
 import org.apache.maven.reporting.exec.MavenReportExecutor;
 import org.apache.maven.reporting.exec.MavenReportExecutorRequest;
 
-import static org.apache.maven.shared.utils.logging.MessageUtils.buffer;
-
 /**
  * Base class for site rendering mojos.
  *
@@ -301,10 +299,6 @@ protected SiteRenderingContext createSiteRenderingContext(Locale locale)
             Artifact skinArtifact =
                     siteTool.getSkinArtifactFromRepository(repoSession, remoteProjectRepositories, siteModel.getSkin());
 
-            getLog().info(buffer().a("Rendering content with ")
-                    .strong(skinArtifact.getId() + " skin")
-                    .build());
-
             context = siteRenderer.createContextForSkin(
                     skinArtifact, templateProperties, siteModel, project.getName(), locale);
         } catch (SiteToolException e) {