Issue 377: New build for releasing a new version

Tools/Google.Apis.Release/ProjectExtenstions.cs

Index: Tools/Google.Apis.Release/ProjectExtenstions.cs
===================================================================
new file mode 100644
--- /dev/null
+++ b/Tools/Google.Apis.Release/ProjectExtenstions.cs
@@ -0,0 +1,85 @@
+/*
+Copyright 2013 Google Inc
+
+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.
+*/
+
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+
+using Microsoft.Build.Evaluation;
+
+using Google.Apis.Utils;
+using Google.Apis.Utils.Trace;
+
+namespace Google.Apis.Release
+{
+    /// <summary>
+    /// Extension methods for the Project class. 
+    /// Add support in getting the short name of the project and also in replacing the current library version with 
+    /// the new version (<see cref="ReplaceVersion"/>).
+    /// </summary>
+    internal static class ProjectExtenstions
+    {
+        static readonly TraceSource TraceSource = new TraceSource("Google.Apis");
+
+        /// <summary>Gets the name of the project.</summary>
+        public static string GetName(this Project project)
+        {
+            return project.DirectoryPath.Substring(project.DirectoryPath.LastIndexOf(Path.DirectorySeparatorChar) + 1);
+        }
+
+        /// <summary>Replaces Assembly version number with the given one.</summary>
+        public static void ReplaceVersion(this Project project, string newVersion)
+        {
+            const string ASSEMBLY_INFO_PREFIX = "[assembly: AssemblyVersion(\"";
+
+            // no need to increase version
+            if (newVersion == null)
+                return;
+
+            var assemblyInfoFile = System.IO.Path.Combine(project.DirectoryPath, "Properties", "AssemblyInfo.cs");
+
+            try
+            {
+                // read all lines and replace the current version with the given newVersion
+                var allLines = File.ReadAllLines(assemblyInfoFile).Select(
+                    l =>
+                    {
+                        // if the line contains assembly information, replace old version with new version
+                        if (l.StartsWith(ASSEMBLY_INFO_PREFIX))
+                            return ReplaceVersionInLine(l, ASSEMBLY_INFO_PREFIX, newVersion);
+                        else
+                            return l;
+                    });
+                File.WriteAllLines(assemblyInfoFile, allLines);
+            }
+            catch (Exception ex)
+            {
+                TraceSource.TraceEvent(TraceEventType.Error, "Exception occurred while replacing version", ex.Message);
+            }
+        }
+
+        /// <summary>Returns the assembly information line with the new version. </summary>
+        private static string ReplaceVersionInLine(string line, string assemblyVersionPrefix, string newVersion)
+        {
+            var startVersion = assemblyVersionPrefix.Length;
+            // '.*' ends the old version number (e.g 1.2.* or 1.2.0.*)
+            var endVersion = line.IndexOf(".*", startVersion);
+            var oldVersion = line.Substring(startVersion, endVersion - startVersion);
+            return line.Replace(assemblyVersionPrefix + oldVersion, assemblyVersionPrefix + newVersion);
+        }
+    }
+}