Added support for NextVersion.txt in GitFlow and dynamic repositories

GitVersionCore/GitFlow/BranchFinders/DevelopBasedVersionFinderBase.cs

@@ -37,6 +37,8 @@ protected SemanticVersion FindVersion(
                     context.CurrentBranch.Name, releaseDate)
             };
 
+            semanticVersion.OverrideVersionManuallyIfNeeded(context.Repository);
+
             return semanticVersion;
         }
 

GitVersionCore/GitFlow/BranchFinders/DevelopVersionFinder.cs

@@ -30,6 +30,9 @@ public SemanticVersion FindVersion(GitVersionContext context)
                 PreReleaseTag = "unstable" + numberOfCommitsSinceRelease,
                 BuildMetaData = new SemanticVersionBuildMetaData(numberOfCommitsSinceRelease, context.CurrentBranch.Name, releaseDate),
             };
+
+            semanticVersion.OverrideVersionManuallyIfNeeded(context.Repository);
+
             return semanticVersion;
         }
     }

GitVersionCore/GitFlow/BranchFinders/MasterVersionFinder.cs

@@ -17,16 +17,23 @@ public SemanticVersion FindVersion(IRepository repository, Commit tip)
                 }
             }
 
+            var semanticVersion = new SemanticVersion();
+
             string versionString;
             if (MergeMessageParser.TryParse(tip, out versionString))
             {
                 if (ShortVersionParser.TryParse(versionString, out major, out minor, out patch))
                 {
-                    return BuildVersion(repository, tip, major, minor, patch);
+                    semanticVersion = BuildVersion(repository, tip, major, minor, patch);
                 }
             }
 
-            throw new WarningException("The head of master should always be a merge commit if you follow gitflow. Please create one or work around this by tagging the commit with SemVer compatible Id.");
+            if (semanticVersion == null || semanticVersion.IsEmpty())
+            {
+                throw new WarningException("The head of master should always be a merge commit if you follow gitflow. Please create one or work around this by tagging the commit with SemVer compatible Id.");
+            }
+
+            return semanticVersion;
         }
 
         SemanticVersion BuildVersion(IRepository repository, Commit tip, int major, int minor, int patch)

GitVersionCore/GitFlow/BranchFinders/SupportVersionFinder.cs

@@ -17,16 +17,25 @@ public SemanticVersion FindVersion(IRepository repository, Commit tip)
                 }
             }
 
+            var semanticVersion = new SemanticVersion();
+
             string versionString;
             if (MergeMessageParser.TryParse(tip, out versionString))
             {
                 if (ShortVersionParser.TryParse(versionString, out major, out minor, out patch))
                 {
-                    return BuildVersion(repository, tip, major, minor, patch);
+                    semanticVersion = BuildVersion(repository, tip, major, minor, patch);
                 }
             }
 
-            throw new WarningException("The head of a support branch should always be a merge commit if you follow gitflow. Please create one or work around this by tagging the commit with SemVer compatible Id.");
+            semanticVersion.OverrideVersionManuallyIfNeeded(repository);
+
+            if (semanticVersion == null || semanticVersion.IsEmpty())
+            {
+                throw new WarningException("The head of a support branch should always be a merge commit if you follow gitflow. Please create one or work around this by tagging the commit with SemVer compatible Id.");
+            }
+
+            return semanticVersion;
         }
 
         SemanticVersion BuildVersion(IRepository repository, Commit tip, int major, int minor, int patch)

GitVersionCore/GitHubFlow/NextVersionTxtFileFinder.cs

@@ -19,14 +19,18 @@ public SemanticVersion GetNextVersion()
             {
                 return new SemanticVersion();
             }
-            var version = File.ReadAllText(filePath);
 
+            var version = File.ReadAllText(filePath);
             if (string.IsNullOrEmpty(version))
+            {
                 return new SemanticVersion();
+            }
 
             SemanticVersion semanticVersion;
             if (!SemanticVersion.TryParse(version, out semanticVersion))
+            {
                 throw new ArgumentException("Make sure you have a valid semantic version in NextVersion.txt");
+            }
 
             return semanticVersion;
         }

GitVersionCore/GitVersionCore.csproj

@@ -7,7 +7,7 @@
     <ProjectGuid>{F9741A0D-B9D7-4557-9A1C-A7252C1071F5}</ProjectGuid>
     <OutputType>Library</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>GitVersionCore</RootNamespace>
+    <RootNamespace>GitVersion</RootNamespace>
     <AssemblyName>GitVersionCore</AssemblyName>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
@@ -66,6 +66,7 @@
     <Compile Include="BuildServers\TeamCity.cs" />
     <Compile Include="CachedVersion.cs" />
     <Compile Include="DirectoryDateFinder.cs" />
+    <Compile Include="SemanticVersionExtensions.cs" />
     <Compile Include="WarningException.cs" />
     <Compile Include="ExtensionMethods.cs" />
     <Compile Include="GitDirFinder.cs" />

GitVersionCore/LibGitExtensions.cs

@@ -2,6 +2,7 @@ namespace GitVersion
 {
     using System;
     using System.Collections.Generic;
+    using System.IO;
     using System.Linq;
     using LibGit2Sharp;
 
@@ -73,5 +74,59 @@ public static bool IsDetachedHead(this Branch branch)
         {
             return branch.CanonicalName.Equals("(no branch)", StringComparison.OrdinalIgnoreCase);
         }
+
+        public static string GetRepositoryDirectory(this IRepository repository)
+        {
+            var gitDirectory = repository.Info.Path;
+
+            gitDirectory = gitDirectory.TrimEnd('\\');
+
+            if (gitDirectory.EndsWith(".git"))
+            {
+                gitDirectory = gitDirectory.Substring(0, gitDirectory.Length - ".git".Length);
+            }
+
+            return gitDirectory;
+        }
+
+        public static void CheckoutFilesIfExist(this IRepository repository, params string[] fileNames)
+        {
+            if (fileNames == null || fileNames.Length == 0)
+            {
+                return;
+            }
+
+            Logger.WriteInfo(string.Format("Checking out files that might be needed later in dynamic repository"));
+
+            foreach (var fileName in fileNames)
+            {
+                try
+                {
+                    Logger.WriteInfo(string.Format("  Trying to check out '{0}'", fileName));
+
+                    var headBranch = repository.Head;
+                    var tip = headBranch.Tip;
+
+                    var treeEntry = tip[fileName];
+                    if (treeEntry == null)
+                    {
+                        continue;
+                    }
+
+                    var fullPath = Path.Combine(repository.GetRepositoryDirectory(), fileName);
+                    using (var stream = ((Blob) treeEntry.Target).GetContentStream())
+                    {
+                        using (var streamReader = new BinaryReader(stream))
+                        {
+                            File.WriteAllBytes(fullPath, streamReader.ReadBytes((int)stream.Length));
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Logger.WriteWarning(string.Format("  An error occurred while checking out '{0}': '{1}'", fileName, ex.Message));
+                }
+            }
+        }
     }
 }

GitVersionCore/SemanticVersion.cs

@@ -5,6 +5,8 @@ namespace GitVersion
 
     public class SemanticVersion : IFormattable, IComparable<SemanticVersion>
     {
+        public static SemanticVersion Empty = new SemanticVersion();
+
         static Regex ParseSemVer = new Regex(
             @"[vV]?(?<SemVer>(?<Major>\d+)(\.(?<Minor>\d+))?(\.(?<Patch>\d+))?)(\.(?<FourthPart>\d+))?(-(?<Tag>[^\+]*))?(\+(?<BuildMetaData>.*))?",
             RegexOptions.Compiled);
@@ -34,6 +36,11 @@ public bool Equals(SemanticVersion obj)
                    BuildMetaData == obj.BuildMetaData;
         }
 
+        public bool IsEmpty()
+        {
+            return Equals(Empty);
+        }
+
         public static bool operator ==(SemanticVersion v1, SemanticVersion v2)
         {
             if (ReferenceEquals(v1, null))

GitVersionCore/SemanticVersionExtensions.cs

@@ -0,0 +1,22 @@
+namespace GitVersion
+{
+    using LibGit2Sharp;
+
+    public static class SemanticVersionExtensions
+    {
+        public static void OverrideVersionManuallyIfNeeded(this SemanticVersion version, IRepository repository)
+        {
+            var nextVersionTxtFileFinder = new NextVersionTxtFileFinder(repository.GetRepositoryDirectory());
+            var manualNextVersion = nextVersionTxtFileFinder.GetNextVersion();
+            if (!manualNextVersion.IsEmpty())
+            {
+                if (manualNextVersion > version)
+                {
+                    version.Major = manualNextVersion.Major;
+                    version.Minor = manualNextVersion.Minor;
+                    version.Patch = manualNextVersion.Patch;
+                }
+            }
+        }
+    }
+}

GitVersionExe/GitPreparer.cs

@@ -73,6 +73,8 @@ string GetGitInfoFromUrl()
 
                         repository.Refs.UpdateTarget("HEAD", targetBranchName);
                     }
+
+                    repository.CheckoutFilesIfExist("NextVersion.txt");
                 }
             }
 

Tests/SemanticVersionTests.cs

@@ -61,5 +61,12 @@ public void LegacySemVerTest()
         new SemanticVersionPreReleaseTag("AReallyReallyReallyLongBranchName", 1).ToString("lp").ShouldBe("AReallyReallyRea0001");
     }
 
+    [Test]
+    public void EmptyVersion()
+    {
+        Assert.IsTrue(SemanticVersion.Empty.IsEmpty());
 
+        var emptyVersion = new SemanticVersion();
+        Assert.IsTrue(emptyVersion.IsEmpty());
+    }
 }