Scoped prerelease number to prerelease label

Author: Guillaume Rouchon

src/GitVersionCore.Tests/VersionCalculation/NextVersionCalculatorTests.cs

@@ -1,8 +1,10 @@
 namespace GitVersionCore.Tests.VersionCalculation
 {
     using System;
+    using System.Collections.Generic;
     using GitVersion;
     using GitVersion.VersionCalculation;
+    using LibGit2Sharp;
     using NUnit.Framework;
     using Shouldly;
 
@@ -94,5 +96,32 @@ public void PreReleaseTagCanUseBranchNameVariable()
 
             version.ToString("f").ShouldBe("1.0.0-alpha.foo.1+2");
         }
+
+        [Test]
+        public void PreReleaseNumberShouldBeScopeToPreReleaseLabelInContinuousDelivery()
+        {
+            var config = new Config();
+            config.VersioningMode = VersioningMode.ContinuousDelivery;
+            config.Branches = new Dictionary<string, BranchConfig> {
+                { "master", new BranchConfig() { Tag = "beta" } },
+            };
+
+            using (var fixture = new EmptyRepositoryFixture(config))
+            {
+                fixture.Repository.MakeACommit();
+
+                fixture.Repository.CreateBranch("feature/test");
+                fixture.Repository.Checkout("feature/test");
+                fixture.Repository.MakeATaggedCommit("0.1.0-test.1");
+                fixture.Repository.MakeACommit();
+
+                fixture.AssertFullSemver("0.1.0-test.2+2");
+
+                fixture.Repository.Checkout("master");
+                fixture.Repository.Merge(fixture.Repository.FindBranch("feature/test"), Constants.SignatureNow());
+
+                fixture.AssertFullSemver("0.1.0-beta.1+2");
+            }
+        }
     }
 }

src/GitVersionCore/LibGitExtensions.cs

@@ -29,7 +29,7 @@ public static Branch FindBranch(this IRepository repository, string branchName)
             return repository.Branches.FirstOrDefault(x => x.Name == "origin/" + branchName);
         }
 
-        public static SemanticVersion LastVersionTagOnBranch(this Branch branch, IRepository repository, string tagPrefixRegex)
+        public static IEnumerable<SemanticVersion> GetVersionTagsOnBranch(this Branch branch, IRepository repository, string tagPrefixRegex)
         {
             var tags = repository.Tags.Select(t => t).ToList();
 
@@ -43,8 +43,7 @@ public static SemanticVersion LastVersionTagOnBranch(this Branch branch, IReposi
                 if (SemanticVersion.TryParse(t.Name, tagPrefixRegex, out semver))
                     return new [] { semver };
                 return new SemanticVersion[0];
-            }))
-            .FirstOrDefault();
+            }));
         }
 
 

src/GitVersionCore/VersionCalculation/NextVersionCalculator.cs

@@ -1,5 +1,6 @@
 namespace GitVersion.VersionCalculation
 {
+    using System.Linq;
     using System.Text.RegularExpressions;
     using BaseVersionCalculators;
 
@@ -98,7 +99,10 @@ void UpdatePreReleaseTag(GitVersionContext context, SemanticVersion semanticVers
                 }
             }
 
-            var lastTag = context.CurrentBranch.LastVersionTagOnBranch(context.Repository, context.Configuration.GitTagPrefix);
+            var lastTag = context.CurrentBranch
+                .GetVersionTagsOnBranch(context.Repository, context.Configuration.GitTagPrefix)
+                .FirstOrDefault(v => v.PreReleaseTag.Name == tagToUse);
+
             if (number == null &&
                 lastTag != null &&
                 MajorMinorPatchEqual(lastTag, semanticVersion) &&