prepare for lazy loading

scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/spi/javahg/HgLogChangesetCommand.java

@@ -71,6 +71,11 @@ public class HgLogChangesetCommand extends AbstractCommand
    */
   private static final byte[] CHANGESET_PATTERN = Utils.randomBytes();
 
+  /** Field description */
+  private static final String CHANGESET_LAZY_STYLE_PATH =
+    Utils.resourceAsFile("/sonia/scm/styles/changesets-lazy.style",
+      ImmutableMap.of("pattern", CHANGESET_PATTERN)).getPath();
+
   /** Field description */
   private static final String CHANGESET_EAGER_STYLE_PATH =
     Utils.resourceAsFile("/sonia/scm/styles/changesets-eager.style",
@@ -141,6 +146,23 @@ public class HgLogChangesetCommand extends AbstractCommand
     return this;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param files
+   *
+   * @return
+   */
+  public List<Integer> loadRevisions(String... files)
+  {
+    cmdAppend("--style", CHANGESET_LAZY_STYLE_PATH);
+
+    HgInputStream stream = launchStream(files);
+
+    return loadRevisionsFromStream(stream);
+  }
+
   /**
    * Method description
    *
@@ -203,9 +225,6 @@ public class HgLogChangesetCommand extends AbstractCommand
 
     changeset.setId(nodeString);
 
-    // revision
-    in.revisionUpTo('\n');
-
     String user = in.textUpTo('\n');
 
     changeset.setAuthor(Person.toPerson(user));
@@ -275,6 +294,39 @@ public class HgLogChangesetCommand extends AbstractCommand
     return changeset;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param stream
+   *
+   * @return
+   */
+  private List<Integer> loadRevisionsFromStream(HgInputStream stream)
+  {
+    List<Integer> revisions = Lists.newArrayList();
+
+    try
+    {
+      while (stream.peek() != -1)
+      {
+        int rev = stream.revisionUpTo(' ');
+
+        if (rev >= 0)
+        {
+          revisions.add(rev);
+        }
+      }
+
+    }
+    catch (IOException ex)
+    {
+      throw new RuntimeIOException(ex);
+    }
+
+    return revisions;
+  }
+
   /**
    * Method description
    *