Skip existing copyright lines

license-maven-plugin/src/main/java/com/mycila/maven/plugin/license/AbstractLicenseMojo.java

@@ -365,6 +365,12 @@ public abstract class AbstractLicenseMojo extends AbstractMojo {
   @Parameter(property = "license.skipExistingHeaders", defaultValue = "false")
   public boolean skipExistingHeaders = false;
 
+  /**
+   * Skip the formatting of files in which the header matches other than text on the copyright line.
+   */
+  @Parameter(property = "license.skipExistingCopyrightLine", defaultValue = "false")
+  public boolean skipExistingCopyrightLine = false;
+
   /**
    * When enforcing licenses on dependencies, exclude all but these scopes.
    */
@@ -642,12 +648,12 @@ public Properties load(final Document document) {
             callback.onUnknownFile(document, h);
           } else if (document.is(h)) {
             debug("Skipping header file: %s", document.getFilePath());
-          } else if (document.hasHeader(h, strictCheck)) {
+          } else if (document.hasHeader(h, strictCheck, skipExistingCopyrightLine)) {
             callback.onExistingHeader(document, h);
           } else {
             boolean headerFound = false;
             for (final Header validHeader : validHeaders) {
-              headerFound = document.hasHeader(validHeader, strictCheck);
+              headerFound = document.hasHeader(validHeader, strictCheck, skipExistingCopyrightLine);
               if (headerFound) {
                 callback.onExistingHeader(document, h);
                 break;

license-maven-plugin/src/main/java/com/mycila/maven/plugin/license/document/Document.java

@@ -70,23 +70,55 @@ public boolean isNotSupported() {
   }
 
   public boolean hasHeader(Header header, boolean strictCheck) {
+    return hasHeader(header, strictCheck, false);
+  }
+
+  public boolean hasHeader(Header header, boolean strictCheck, boolean skipExistingCopyrightLine) {
     if (!strictCheck) {
       try {
         String fileHeader = readFirstLines(file, header.getLineCount() + 10, encoding);
         String fileHeaderOneLine = remove(fileHeader, headerDefinition.getFirstLine().trim(), headerDefinition.getEndLine().trim(), headerDefinition.getBeforeEachLine().trim(), "\n", "\r", "\t", " ");
         String headerOnOnelIne = mergeProperties(header.asOneLineString());
+        if (skipExistingCopyrightLine) {
+          // extract the copyright line from the file and put it in the header
+          String existingCopyrightLine = getCopyrightLine(fileHeader);
+          String headerCopyrightLine = getCopyrightLine(header.asString());
+          if (existingCopyrightLine != null) {
+            headerOnOnelIne = headerOnOnelIne.replace(headerCopyrightLine, existingCopyrightLine);
+          }
+        }
         return fileHeaderOneLine.contains(remove(headerOnOnelIne, headerDefinition.getFirstLine().trim(), headerDefinition.getEndLine().trim(), headerDefinition.getBeforeEachLine().trim()));
       } catch (IOException e) {
         throw new IllegalStateException("Cannot read file " + getFilePath() + ". Cause: " + e.getMessage(), e);
       }
     }
     try {
+      if (skipExistingCopyrightLine) {
+        return header.isMatchForTextKeepingCopyrightLine(this, headerDefinition, true, encoding);        
+      }
       return header.isMatchForText(this, headerDefinition, true, encoding);
     } catch (IOException e) {
       throw new IllegalStateException("Cannot read file " + getFilePath() + ". Cause: " + e.getMessage(), e);
     }
   }
 
+  public static String getCopyrightLine(String header) {
+    int index = header.toLowerCase().indexOf("copyright");
+    if (index < 0) {
+      return null;
+    }
+    String c = header.substring(index);
+    index = c.indexOf('\r');
+    if (index > 0) {
+      c = c.substring(0, index);
+    }
+    index = c.indexOf('\n');
+    if (index > 0) {
+      c = c.substring(0, index);
+    }
+    return c.trim();
+  }
+
   public void updateHeader(Header header) {
     String headerStr = header.applyDefinitionAndSections(parser.getHeaderDefinition(), parser.getFileContent().isUnix());
     parser.getFileContent().insert(parser.getBeginPosition(), mergeProperties(headerStr));

license-maven-plugin/src/main/java/com/mycila/maven/plugin/license/header/Header.java

@@ -180,6 +180,18 @@ public boolean isMatchForText(Document d, HeaderDefinition headerDefinition, boo
     return isMatchForText(expected, fileHeader, headerDefinition, unix);
   }
 
+  public boolean isMatchForTextKeepingCopyrightLine(Document d, HeaderDefinition headerDefinition, boolean unix, String encoding) throws IOException {
+    String fileHeader = readFirstLines(d.getFile(), getLineCount() + 10, encoding).replaceAll(" *\r?\n", "\n");
+    String existingCopyrightLine = Document.getCopyrightLine(fileHeader);
+    if (existingCopyrightLine == null) {
+      return isMatchForText(d, headerDefinition, unix, encoding);
+    }
+    String headerCopyrightLine = Document.getCopyrightLine(headerContent);
+    String expected = buildForDefinition(headerDefinition, unix);
+    expected = d.mergeProperties(expected).replace(headerCopyrightLine, existingCopyrightLine);
+    return isMatchForText(expected, fileHeader, headerDefinition, unix);
+  }
+
   public String applyDefinitionAndSections(HeaderDefinition headerDefinition, boolean unix) {
 
     String expected = buildForDefinition(headerDefinition, unix);