RebuildNotedb: Elide project names instead of truncating them

The project name in the progress monitor should not exceed 50
characters so that the whole monitor line fits into 80 characters.
This is why the project name was truncated if it was longer. When
projects are organized hierarchically many projects may share the same
prefix and then truncating is bad because one cannot differentiate the
truncated names. This is why the project names should be rather
elided.

Change-Id: I6164f07f98254c41014e62767c8f13d3618d8eb6
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-common/src/main/java/com/google/gerrit/common/FormatUtil.java

@@ -0,0 +1,25 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.common;
+
+public class FormatUtil {
+  public static String elide(String s, int max) {
+    if (s == null || s.length() <= max) {
+      return s;
+    }
+    int len = (max - 3) / 2;
+    return s.substring(0, len) + "..." + s.substring(s.length() - len);
+  }
+}