feat: Converts LF and CRLF to appropriate line ending character

src/main/java/org/codehaus/mojo/license/AbstractFileHeaderMojo.java

@@ -396,6 +396,20 @@ public abstract class AbstractFileHeaderMojo extends AbstractLicenseNameMojo {
      */
     protected abstract boolean isFailOnNotUptodateHeader();
 
+    /**
+     * Converts line ending string, like LF or CRLF, to proper line separator character.
+     *
+     * @param lineSeparator Line separator that may be converted.
+     */
+    public void setLineSeparator(String lineSeparator) {
+        try {
+            this.lineSeparator = Eol.valueOf(lineSeparator).getEolString();
+        } catch (IllegalArgumentException e) {
+            LOG.warn("Unable to parse lineSeparator '{}', using it as-is.", lineSeparator);
+            this.lineSeparator = lineSeparator;
+        }
+    }
+
     // ----------------------------------------------------------------------
     // AbstractLicenseMojo Implementaton
     // ----------------------------------------------------------------------

src/site/apt/examples/update-file-header-config.apt.vm

@@ -41,6 +41,9 @@ Update File Header Examples
 
     * customize description section: Define a template to change the description section of a file header.
 
+    * lineSeparator: Use a custom chain of character as line separator. Providing "LF" and "CRLF" will instead use the
+    characters "\n" and "\r\n", respectively.
+
   To see all extensions accepted run the <<comment-style-list>> goal.
 
 -------------------------------------------------------------------------------