Add "--ignore-usings" parameter to CPD commandline for C#

pmd-core/src/main/java/net/sourceforge/pmd/cpd/CPDConfiguration.java

@@ -67,6 +67,9 @@ public class CPDConfiguration extends AbstractConfiguration {
     @Parameter(names = "--ignore-annotations", description = "Ignore language annotations when comparing text", required = false)
     private boolean ignoreAnnotations;
 
+    @Parameter(names = "--ignore-usings", description = "Ignore using directives in C#", required = false)
+    private boolean ignoreUsings;
+
     @Parameter(names = "--skip-lexical-errors", description = "Skip files which can't be tokenized due to invalid characters instead of aborting CPD", required = false)
     private boolean skipLexicalErrors = false;
 
@@ -224,6 +227,11 @@ public class CPDConfiguration extends AbstractConfiguration {
         } else {
             properties.remove(Tokenizer.IGNORE_ANNOTATIONS);
         }
+        if (configuration.isIgnoreUsings()) {
+            properties.setProperty(Tokenizer.IGNORE_USINGS, "true");
+        } else {
+            properties.remove(Tokenizer.IGNORE_USINGS);
+        }
         properties.setProperty(Tokenizer.OPTION_SKIP_BLOCKS, Boolean.toString(!configuration.isNoSkipBlocks()));
         properties.setProperty(Tokenizer.OPTION_SKIP_BLOCKS_PATTERN, configuration.getSkipBlocksPattern());
         configuration.getLanguage().setProperties(properties);
@@ -335,6 +343,14 @@ public class CPDConfiguration extends AbstractConfiguration {
         this.ignoreAnnotations = ignoreAnnotations;
     }
 
+    public boolean isIgnoreUsings() {
+        return ignoreUsings;
+    }
+
+    public void setIgnoreUsings(boolean ignoreUsings) {
+        this.ignoreUsings = ignoreUsings;
+    }
+
     public boolean isSkipLexicalErrors() {
         return skipLexicalErrors;
     }

pmd-core/src/main/java/net/sourceforge/pmd/cpd/Tokenizer.java

@@ -9,6 +9,13 @@ public interface Tokenizer {
     String IGNORE_LITERALS = "ignore_literals";
     String IGNORE_IDENTIFIERS = "ignore_identifiers";
     String IGNORE_ANNOTATIONS = "ignore_annotations";
+
+    /**
+     * Ignore using directives in C#.
+     * The default value is <code>false</code>.
+     */
+    String IGNORE_USINGS = "ignore_usings";
+
     /**
      * Enables or disabled skipping of blocks like a pre-processor.
      * It is a boolean property.

pmd-cs/src/main/java/net/sourceforge/pmd/cpd/CsTokenizer.java

@@ -20,8 +20,6 @@ import org.apache.commons.lang3.RandomStringUtils;
  */
 public class CsTokenizer implements Tokenizer {
 
-    public static final String IGNORE_USINGS = "ignore_usings";
-
     private boolean ignoreUsings = false;
 
     public void setProperties(Properties properties) {

src/site/markdown/overview/changelog.md

@@ -6,6 +6,8 @@
 
 **Feature Request and Improvements:**
 
+*   CPD: New command line parameter `--ignore-usings`: Ignore using directives in C# when comparing text.
+
 **New/Modified/Deprecated Rules:**
 
 **Pull Requests:**

src/site/markdown/usage/cpd-usage.md

@@ -147,6 +147,12 @@ The options "minimum-tokens" and "files" are the two required options; there are
         <td>no</td>
         <td>java</td>
     </tr>
+    <tr>
+        <td>--ignore-usings</td>
+        <td>Ignore using directives in C# when comparing text</td>
+        <td>no</td>
+        <td>C#</td>
+    </tr>
     <tr>
         <td>--no-skip-blocks</td>
         <td>Do not skip code blocks marked with --skip-blocks-pattern (e.g. #if 0 until #endif)</td>