michael-o commented on code in PR #225:
URL: 
https://github.com/apache/maven-plugin-tools/pull/225#discussion_r1347898698


##########
maven-plugin-report-plugin/src/main/java/org/apache/maven/plugin/plugin/report/GoalRenderer.java:
##########
@@ -0,0 +1,532 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.plugin.report;
+
+import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.text.MessageFormat;
+import java.util.AbstractMap.SimpleEntry;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.maven.doxia.sink.Sink;
+import org.apache.maven.doxia.sink.impl.SinkEventAttributeSet.Semantics;
+import org.apache.maven.doxia.util.HtmlTools;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.Parameter;
+import org.apache.maven.plugin.logging.Log;
+import org.apache.maven.project.MavenProject;
+import org.apache.maven.tools.plugin.EnhancedParameterWrapper;
+import org.apache.maven.tools.plugin.ExtendedMojoDescriptor;
+import org.apache.maven.tools.plugin.javadoc.JavadocLinkGenerator;
+import org.apache.maven.tools.plugin.util.PluginUtils;
+import org.codehaus.plexus.i18n.I18N;
+
+public class GoalRenderer extends AbstractPluginReportRenderer {
+
+    /** Regular expression matching an XHTML link with group 1 = link target, 
group 2 = link label. */
+    private static final Pattern HTML_LINK_PATTERN = Pattern.compile("<a 
href=\\\"([^\\\"]*)\\\">(.*?)</a>");
+
+    /** The directory where the generated site is written. Used for resolving 
relative links to javadoc. */
+    private final File reportOutputDirectory;
+
+    private final MojoDescriptor descriptor;
+    private final boolean disableInternalJavadocLinkValidation;
+
+    private final Log log;
+
+    public GoalRenderer(
+            Sink sink,
+            I18N i18n,
+            Locale locale,
+            MavenProject project,
+            MojoDescriptor descriptor,
+            File reportOutputDirectory,
+            boolean disableInternalJavadocLinkValidation,
+            Log log) {
+        super(sink, locale, i18n, project);
+        this.reportOutputDirectory = reportOutputDirectory;
+        this.descriptor = descriptor;
+        this.disableInternalJavadocLinkValidation = 
disableInternalJavadocLinkValidation;
+        this.log = log;
+    }
+
+    @Override
+    public String getTitle() {
+        return descriptor.getFullGoalName();
+    }
+
+    @Override
+    protected void renderBody() {
+        startSection(descriptor.getFullGoalName());
+        renderReportNotice();
+        renderDescription("fullname", descriptor.getPluginDescriptor().getId() 
+ ":" + descriptor.getGoal(), false);
+
+        String context = "goal " + descriptor.getGoal();
+        if (StringUtils.isNotEmpty(descriptor.getDeprecated())) {
+            renderDescription("deprecated", 
getXhtmlWithValidatedLinks(descriptor.getDeprecated(), context), true);
+        }
+        if (StringUtils.isNotEmpty(descriptor.getDescription())) {
+            renderDescription("description", 
getXhtmlWithValidatedLinks(descriptor.getDescription(), context), true);
+        } else {
+            renderDescription("description", getI18nString("nodescription"), 
false);
+        }
+        renderAttributes();
+
+        List<Parameter> parameterList = filterParameters(
+                descriptor.getParameters() != null ? 
descriptor.getParameters() : Collections.emptyList());
+        if (parameterList.isEmpty()) {
+            startSection(getI18nString("parameters"));
+            sink.paragraph();
+            sink.text(getI18nString("noParameter"));
+            sink.paragraph_();
+            endSection();
+        } else {
+            renderParameterOverviewTable(
+                    getI18nString("requiredParameters"),
+                    
parameterList.stream().filter(Parameter::isRequired).iterator());
+            renderParameterOverviewTable(
+                    getI18nString("optionalParameters"),
+                    parameterList.stream().filter(p -> 
!p.isRequired()).iterator());
+            renderParameterDetails(parameterList.iterator());
+        }
+        endSection();
+    }
+
+    /** Filter parameters to only retain those which must be documented, i.e. 
neither components nor read-only ones.
+     *
+     * @param parameterList not null
+     * @return the parameters list without components. */
+    private static List<Parameter> filterParameters(Collection<Parameter> 
parameterList) {
+        return parameterList.stream()
+                .filter(p -> p.isEditable()
+                        && (p.getExpression() == null || 
!p.getExpression().startsWith("${component.")))
+                .collect(Collectors.toList());
+    }
+
+    private void renderReportNotice() {
+        if (PluginUtils.isMavenReport(descriptor.getImplementation(), 
project)) {
+            renderDescription("notice.prefix", 
getI18nString("notice.isMavenReport"), false);
+        }
+    }
+
+    /**
+     * A description consists of a term/prefix and the actual description text
+     */
+    private void renderDescription(String prefixKey, String description, 
boolean isHtmlMarkup) {
+        // TODO: convert to dt and dd elements
+        renderDescriptionPrefix(prefixKey);
+        sink.paragraph();
+        if (isHtmlMarkup) {
+            sink.rawText(description);
+        } else {
+            sink.text(description);
+        }
+        sink.paragraph_(); // p
+    }
+
+    private void renderDescriptionPrefix(String prefixKey) {
+        sink.paragraph();
+        sink.inline(Semantics.STRONG);
+        sink.text(getI18nString(prefixKey));
+        sink.inline_();
+        sink.text(":");
+        sink.paragraph_();
+    }
+
+    @SuppressWarnings("deprecation")
+    private void renderAttributes() {
+        renderDescriptionPrefix("attributes");
+        sink.list();
+
+        renderAttribute(descriptor.isProjectRequired(), "projectRequired");
+        renderAttribute(descriptor.isRequiresReports(), "reportingMojo");
+        renderAttribute(descriptor.isAggregator(), "aggregator");
+        renderAttribute(descriptor.isDirectInvocationOnly(), 
"directInvocationOnly");
+        renderAttribute(descriptor.isDependencyResolutionRequired(), 
"dependencyResolutionRequired");
+
+        if (descriptor instanceof ExtendedMojoDescriptor) {
+            ExtendedMojoDescriptor extendedDescriptor = 
(ExtendedMojoDescriptor) descriptor;
+            
renderAttribute(extendedDescriptor.getDependencyCollectionRequired(), 
"dependencyCollectionRequired");
+        }
+
+        renderAttribute(descriptor.isThreadSafe(), "threadSafe");
+        renderAttribute(!descriptor.isThreadSafe(), "notThreadSafe");
+        renderAttribute(descriptor.getSince(), "since");
+        renderAttribute(descriptor.getPhase(), "phase");
+        renderAttribute(descriptor.getExecutePhase(), "executePhase");
+        renderAttribute(descriptor.getExecuteGoal(), "executeGoal");
+        renderAttribute(descriptor.getExecuteLifecycle(), "executeLifecycle");
+        renderAttribute(descriptor.isOnlineRequired(), "onlineRequired");
+        renderAttribute(!descriptor.isInheritedByDefault(), 
"notInheritedByDefault");
+
+        sink.list_();
+    }
+
+    private void renderAttribute(boolean condition, String attributeKey) {
+        renderAttribute(condition, attributeKey, Optional.empty());
+    }
+
+    private void renderAttribute(String conditionAndCodeArgument, String 
attributeKey) {
+        renderAttribute(
+                StringUtils.isNotEmpty(conditionAndCodeArgument),
+                attributeKey,
+                Optional.ofNullable(conditionAndCodeArgument));
+    }
+
+    private void renderAttribute(boolean condition, String attributeKey, 
Optional<String> codeArgument) {
+        if (condition) {
+            sink.listItem();
+            linkPatternedText(getI18nString(attributeKey));
+            if (codeArgument.isPresent()) {
+                text(": ");
+                sink.inline(Semantics.CODE);
+                sink.text(codeArgument.get());
+                sink.inline_();
+            }
+            text(".");
+            sink.listItem_();
+        }
+    }
+
+    private void renderParameterOverviewTable(String title, 
Iterator<Parameter> parameters) {
+        // don't emit empty tables
+        if (!parameters.hasNext()) {
+            return;
+        }
+        startSection(title);
+        startTable();
+        tableHeader(new String[] {
+            getI18nString("parameter.name.header"),
+            getI18nString("parameter.type.header"),
+            getI18nString("parameter.since.header"),
+            getI18nString("parameter.description.header")
+        });
+        while (parameters.hasNext()) {
+            renderParameterOverviewTableRow(parameters.next());
+        }
+        endTable();
+        endSection();
+    }
+
+    private void renderTableCellWithCode(String text) {
+        renderTableCellWithCode(text, Optional.empty());
+    }
+
+    private void renderTableCellWithCode(String text, URI link) {
+        renderTableCellWithCode(text, Optional.of(link));
+    }
+
+    private void renderTableCellWithCode(String text, Optional<URI> link) {
+        sink.tableCell();
+        if (link.isPresent()) {
+            sink.link(link.get().toString(), null);
+        }
+        sink.inline(Semantics.CODE);
+        sink.text(text);
+        sink.inline_();
+        if (link.isPresent()) {
+            sink.link_();
+        }
+        sink.tableCell_();
+    }
+
+    private void renderParameterOverviewTableRow(Parameter parameter) {
+        sink.tableRow();
+        // name
+        try {
+            // link to appropriate section
+            renderTableCellWithCode(
+                    format("parameter.name", parameter.getName()),
+                    new URI(null, null, 
HtmlTools.encodeId(parameter.getName())));

Review Comment:
   Why encode when you use the URI class, that should abstract it away no? I 
have the feeling that the usage of `URI` is absolutely not necessary anymore 
here. It maybe sufficient to pass around opaque valid strings.



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