Added README

README.md

@@ -0,0 +1,37 @@
+# [Bld](https://rife2.com/bld) Extension to Perform Static Code Analysis with [PMD](https://pmd.github.io/)
+
+
+[![License (3-Clause BSD)](https://img.shields.io/badge/license-BSD%203--Clause-blue.svg?style=flat-square)](http://opensource.org/licenses/BSD-3-Clause)
+[![Java](https://img.shields.io/badge/java-17%2B-blue)](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html)
+[![GitHub CI](https://github.com/rife2/bld-pmd/actions/workflows/bld.yml/badge.svg)](https://github.com/rife2/bld-pmd/actions/workflows/bld.yml)
+
+To check all source code using the [java quickstart rule](https://pmd.github.io/pmd/pmd_rules_java.html).
+
+```java
+@BuildCommand
+public void pmd() throws Exception {
+    new PmdOperation(this).execute();
+}
+```
+```text
+./bld pmd test
+```
+
+To check the main source code using a custom rule, [java error prone rule](https://pmd.github.io/pmd/pmd_rules_java.html) and failing on any violation.
+
+```java
+@BuildCommand
+public void pmdMain() throws Exception {
+    new PmdOperation(this)
+        .failOnValidation(true)
+        .addInputPath(project.srcMainDirectory().toPath())
+        .addRuletSet("config/pmd.xml", "category/java/errorprone.xml");
+        .execute();
+}
+```
+
+```text
+./dld compile pmdMain
+```
+
+Please check the [PmdOperation documentation](https://rife2.github.io/bld-pmd/rife/bld/extension/PmdOperation.html#method-summary) for all available configuration options.

src/main/java/rife/bld/extension/PmdOperation.java

@@ -43,12 +43,13 @@ public class PmdOperation extends AbstractOperation<PmdOperation> {
     /**
      * The default rule set.
      */
-    public static final String RULESET_DEFAULT = "rulesets/java/quickstart.xml";
+    public static final String RULE_SET_DEFAULT = "rulesets/java/quickstart.xml";
     private static final Logger LOGGER = Logger.getLogger(PmdOperation.class.getName());
     private static final String PMD_DIR = "pmd";
 
     /**
      * The cache location.
+     *
      */
     Path cache;
     /**
@@ -154,21 +155,21 @@ public class PmdOperation extends AbstractOperation<PmdOperation> {
 
         inputPaths.add(project.srcMainDirectory().toPath());
         inputPaths.add(project.srcTestDirectory().toPath());
-        ruleSets.add(RULESET_DEFAULT);
+        ruleSets.add(RULE_SET_DEFAULT);
     }
 
     /**
-     * Adds the path to a source file, or directory containing source files to analyze.
+     * Adds paths to source files, or directories containing source files to analyze.
      *
      * @see #inputPaths(Path...)
      */
-    public PmdOperation addInputPath(Path inputPath) {
+    public PmdOperation addInputPath(Path... inputPath) {
-        inputPaths.add(inputPath);
+        inputPaths.addAll(List.of(inputPath));
         return this;
     }
 
     /**
-     * Adds a new rule set path.
+     * Adds new rule set paths.
      * <p>
      * The built-in rule set paths are:
      * <ul>
@@ -185,8 +186,8 @@ public class PmdOperation extends AbstractOperation<PmdOperation> {
      *
      * @see #ruleSets(String...)
      */
-    public PmdOperation addRuleSet(String ruleSet) {
+    public PmdOperation addRuleSet(String... ruleSet) {
-        ruleSets.add(ruleSet);
+        ruleSets.addAll(List.of(ruleSet));
         return this;
     }
 

src/test/java/rife/bld/extension/PmdOperationTest.java

@@ -69,28 +69,35 @@ public class PmdOperationTest {
     void testJavaErrorProne() {
         var pmd = pmdOperation.ruleSets("category/java/errorprone.xml");
         assertThat(pmd.performPmdAnalysis(TEST, pmd.initConfiguration(COMMAND_NAME)))
-                .as("no errors").isGreaterThan(0);
+                .as("many errors").isGreaterThan(0);
+    }
+
+    @Test
+    void testJavaCodeStyleAndErrorProne() {
+        var pmd = pmdOperation.addRuleSet("category/java/codestyle.xml", "category/java/errorprone.xml");
+        assertThat(pmd.performPmdAnalysis(TEST, pmd.initConfiguration(COMMAND_NAME)))
+                .as("many errors").isGreaterThan(0);
     }
 
     @Test
     void testJavaCodeStyle() {
         var pmd = pmdOperation.ruleSets("category/java/codestyle.xml");
         assertThat(pmd.performPmdAnalysis(TEST, pmd.initConfiguration(COMMAND_NAME)))
-                .as("no errors").isGreaterThan(0);
+                .as("many errors").isGreaterThan(0);
     }
 
     @Test
     void testJavaDesign() {
         var pmd = pmdOperation.ruleSets("category/java/design.xml");
         assertThat(pmd.performPmdAnalysis(TEST, pmd.initConfiguration(COMMAND_NAME)))
-                .as("no errors").isGreaterThan(0);
+                .as("many errors").isGreaterThan(0);
     }
 
     @Test
     void testJavaDocumentation() {
         var pmd = pmdOperation.ruleSets("category/java/documentation.xml");
         assertThat(pmd.performPmdAnalysis(TEST, pmd.initConfiguration(COMMAND_NAME)))
-                .as("no errors").isGreaterThan(0);
+                .as("many errors").isGreaterThan(0);
     }
 
     @Test