added api for changing diff output format

scm-core/src/main/java/sonia/scm/repository/api/DiffCommandBuilder.java

@@ -110,7 +110,7 @@ public final class DiffCommandBuilder
    * @throws RepositoryException
    */
   public DiffCommandBuilder retriveContent(OutputStream outputStream)
-          throws IOException, RepositoryException
+    throws IOException, RepositoryException
   {
     getDiffResult(outputStream);
 
@@ -148,6 +148,26 @@ public final class DiffCommandBuilder
 
   //~--- set methods ----------------------------------------------------------
 
+  /**
+   * Sets the diff format which should be used for the output. 
+   * <strong>Note: </strong> If the repository provider does not support the 
+   * diff format, it will fallback to its default format.
+   *
+   *
+   * @param format format of the diff output
+   *
+   * @return {@code this}
+   * 
+   * @since 1.34
+   */
+  public DiffCommandBuilder setFormat(DiffFormat format)
+  {
+    Preconditions.checkNotNull(format, "format could not be null");
+    request.setFormat(format);
+
+    return this;
+  }
+
   /**
    * Show the difference only for the given path.
    *
@@ -191,11 +211,11 @@ public final class DiffCommandBuilder
    * @throws RepositoryException
    */
   private void getDiffResult(OutputStream outputStream)
-          throws IOException, RepositoryException
+    throws IOException, RepositoryException
   {
     Preconditions.checkNotNull(outputStream, "OutputStream is required");
     Preconditions.checkArgument(request.isValid(),
-                                "path and/or revision is required");
+      "path and/or revision is required");
 
     if (logger.isDebugEnabled())
     {

scm-core/src/main/java/sonia/scm/repository/api/DiffFormat.java

@@ -0,0 +1,57 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.repository.api;
+
+/**
+ * Specifies the output format of a diff command.
+ *
+ * @author Sebastian Sdorra
+ * @since 1.34
+ */
+public enum DiffFormat
+{
+
+  /**
+   * default format of the underlying repository provider
+   */
+  NATIVE,
+
+  /**
+   * git diff format
+   */
+  GIT,
+  
+  /**
+   * traditional unified diff command
+   */
+  UNIFIED;
+}

scm-core/src/main/java/sonia/scm/repository/spi/DiffCommandRequest.java

@@ -38,6 +38,7 @@ package sonia.scm.repository.spi;
 import com.google.common.base.Strings;
 
 import sonia.scm.Validateable;
+import sonia.scm.repository.api.DiffFormat;
 
 /**
  *
@@ -92,4 +93,39 @@ public final class DiffCommandRequest extends FileBaseCommandRequest
     return !Strings.isNullOrEmpty(getPath())
       ||!Strings.isNullOrEmpty(getRevision());
   }
+
+  //~--- set methods ----------------------------------------------------------
+
+  /**
+   * Sets the diff format which should be used for the output.
+   *
+   *
+   * @param format format of the diff output
+   * 
+   * @since 1.34
+   */
+  public void setFormat(DiffFormat format)
+  {
+    this.format = format;
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Return the output format of the diff command.
+   *
+   *
+   * @return output format
+   * 
+   * @since 1.34
+   */
+  DiffFormat getFormat()
+  {
+    return format;
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** diff format */
+  private DiffFormat format = DiffFormat.NATIVE;
 }