only perform PerformPreProcessingSteps once per solution instance

fixes #87

Author: SimonCropp

GitVersionTask/VersionAndBranchFinder.cs

@@ -1,10 +1,11 @@
 namespace GitVersionTask
 {
+    using System.Collections.Generic;
     using GitVersion;
 
     public static class VersionAndBranchFinder
     {
-
+        static List<string> processedDirectories = new List<string>(); 
         public static bool TryGetVersion(string directory, out SemanticVersion versionAndBranch)
         {
             var gitDirectory = GitDirFinder.TreeWalkForGitDir(directory);
@@ -21,11 +22,15 @@ public static bool TryGetVersion(string directory, out SemanticVersion versionAn
                 return false;
             }
 
-            var authentication = new Authentication();
-            foreach (var buildServer in BuildServerList.GetApplicableBuildServers(authentication))
+            if (!processedDirectories.Contains(directory))
             {
-                Logger.WriteInfo(string.Format("Executing PerformPreProcessingSteps for '{0}'.", buildServer.GetType().Name));
-                buildServer.PerformPreProcessingSteps(gitDirectory);
+                processedDirectories.Add(directory);
+                var authentication = new Authentication();
+                foreach (var buildServer in BuildServerList.GetApplicableBuildServers(authentication))
+                {
+                    Logger.WriteInfo(string.Format("Executing PerformPreProcessingSteps for '{0}'.", buildServer.GetType().Name));
+                    buildServer.PerformPreProcessingSteps(gitDirectory);
+                }
             }
             versionAndBranch = VersionCache.GetVersion(gitDirectory);
             return true;

Tests/Tests.csproj

@@ -107,6 +107,7 @@
     <Compile Include="BuildServers\BuildServerBaseTests.cs" />
     <Compile Include="BuildServers\TeamCityTests.cs" />
     <Compile Include="BuildServers\ContinuaCiTests.cs" />
+    <Compile Include="VersionAndBranchFinderTests.cs" />
     <Compile Include="GitHubFlow\MergedBranchesWithVersionFinderTests.cs" />
     <Compile Include="LambdaEqualityHelperFixture.cs" />
     <Compile Include="GitFlow\GitFlowVersionFinderTests.cs" />

Tests/VersionAndBranchFinderTests.cs

@@ -0,0 +1,26 @@
+using System.Diagnostics;
+using GitVersion;
+using GitVersionTask;
+using LibGit2Sharp;
+using NUnit.Framework;
+
+[TestFixture]
+public class VersionAndBranchFinderTests: Lg2sHelperBase
+{
+    [Test]
+    public void ShouldBeAbleGetVersionFromGitDir()
+    {
+        var repoPath = Clone(ASBMTestRepoWorkingDirPath);
+        using (var repo = new Repository(repoPath))
+        {
+            // Create a pull request branch from the parent of current develop tip
+            repo.Branches.Add("pull/1735/merge", "develop~").ForceCheckout();
+
+            AddOneCommitToHead(repo, "code");
+
+        }
+        SemanticVersion versionAndBranch;
+        VersionAndBranchFinder.TryGetVersion(ASBMTestRepoWorkingDirPath, out versionAndBranch);
+        Debug.Write(versionAndBranch);
+    }
+}