feat: Make nice message for auto-merge

Author: twpol

Git/Project.cs

@@ -52,12 +52,20 @@ public string Describe(string options)
 
         public string CommitTree(string treeRef, IEnumerable<string> parentRefs, string message)
         {
-            var parents = String.Join(" ", parentRefs.Select(parentRef => $"-p {parentRef}"));
-            foreach (var line in GetCommandOutput($"commit-tree {treeRef} {parents} -m {message}"))
+            var tempFile = Path.GetTempFileName();
+            File.WriteAllText(tempFile, message);
+            try {
+                var parents = String.Join(" ", parentRefs.Select(parentRef => $"-p {parentRef}"));
+                foreach (var line in GetCommandOutput($"commit-tree {treeRef} {parents} -F {tempFile}"))
+                {
+                    return line;
+                }
+                throw new ApplicationException("Unable to describe commit");
+            }
+            finally
             {
-                return line;
+                File.Delete(tempFile);
             }
-            throw new ApplicationException("Unable to describe commit");
         }
 
         public void CheckoutDetached(string reference)

Program.cs

@@ -110,7 +110,12 @@ static async Task AsyncMain(IConfigurationRoot config)
                 }
             }
             var mergedCommit = git.ParseRef("HEAD");
-            var newMergeBranchCommit = git.CommitTree($"{mergedCommit}^{{tree}}", mergeBranchParents, "Auto-merge");
+            var mergedMessage = String.Format(gitHubConfig["mergeMessageFormat"],
+                baseBranchVersion,
+                autoMergePullRequestsSuccess.Count,
+                String.Join("", autoMergePullRequestsSuccess.Select(pr => String.Format(gitHubConfig["mergeMessagePRFormat"], pr.Number, pr.Title)))
+            );
+            var newMergeBranchCommit = git.CommitTree($"{mergedCommit}^{{tree}}", mergeBranchParents, mergedMessage);
             git.SetBranchRef(gitHubConfig["branch"], newMergeBranchCommit);
             Console.WriteLine($"Base branch commit: {baseBranchCommit}");
             Console.WriteLine($"Base branch version: {baseBranchVersion}");