feat: implement core code review extension

jars/pmd/PmdRunner.java

@@ -0,0 +1,44 @@
+import java.io.*;
+import java.nio.file.*;
+import net.sourceforge.pmd.*;
+import net.sourceforge.pmd.renderers.*;
+
+public class PmdRunner {
+    public static void main(String[] args) throws Exception {
+        if (args.length < 2) {
+            System.err.println("Usage: PmdRunner <filePath|- for stdin> <rulesetPath>");
+            System.exit(1);
+            return;
+        }
+
+        String filePath = args[0];
+        String rulesetPath = args[1];
+
+        Path tempFile = null;
+        if ("-".equals(filePath)) {
+            String code = new String(System.in.readAllBytes());
+            tempFile = Files.createTempFile("pmd-stdin-", ".java");
+            Files.writeString(tempFile, code);
+            filePath = tempFile.toString();
+        }
+
+        try {
+            PMDConfiguration config = new PMDConfiguration();
+            config.setInputFilePath(Path.of(filePath));
+            config.addRuleSet(Path.of(rulesetPath));
+            config.setReportFormat("json");
+
+            StringWriter writer = new StringWriter();
+            config.setReportWriter(writer);
+
+            PmdAnalysis pmd = PmdAnalysis.create(config);
+            pmd.performAnalysis();
+
+            System.out.print(writer.toString());
+        } finally {
+            if (tempFile != null) {
+                Files.deleteIfExists(tempFile);
+            }
+        }
+    }
+}

jars/pmd/pmd-java-ruleset.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<ruleset name="Java Rules"
+    xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+    <description>Java Code Review Rules</description>
+    <rule ref="category/java/bestpractices.xml"/>
+    <rule ref="category/java/codestyle.xml"/>
+    <rule ref="category/java/design.xml"/>
+    <rule ref="category/java/errorprone.xml"/>
+    <rule ref="category/java/performance.xml"/>
+    <rule ref="category/java/security.xml"/>
+</ruleset>

jars/pmd/pmd-jsp-ruleset.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<ruleset name="JSP Rules"
+    xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+    <description>JSP Code Review Rules</description>
+    <rule ref="category/jsp/bestpractices.xml"/>
+    <rule ref="category/jsp/codestyle.xml"/>
+    <rule ref="category/jsp/design.xml"/>
+    <rule ref="category/jsp/errorprone.xml"/>
+</ruleset>