fix: handle empty section

Author: netpyoung

NF.Tool.ReleaseNoteMaker/NF.Tool.ReleaseNoteMaker.Common/Fragments/FragmentFinder.cs

@@ -54,7 +54,8 @@ public static (Exception? exOrNull, FragmentResult result) FindFragments(string
                     files = [];
                 }
 
-                foreach (string fileName in files.Select(x => Path.GetFileName(x)))
+                string[] fileNames = files.Select(x => Path.GetFileName(x)).ToArray();
+                foreach (string fileName in fileNames)
                 {
                     if (ignoredFileNameSet.Any(pattern => IsMatch(fileName.ToLower(), pattern)))
                     {
@@ -108,6 +109,11 @@ public static (Exception? exOrNull, FragmentResult result) FindFragments(string
 
                     fragmentContents.Add(new FragmentContent(sectionDisplayName, fragmentBaseName, data));
                 }
+
+                if (fileNames.Length == 0)
+                {
+                    fragmentContents.Add(new FragmentContent(sectionDisplayName, FragmentBasename.Empty, string.Empty));
+                }
             }
 
             return (null, new FragmentResult { FragmentContents = fragmentContents, FragmentFiles = fragmentFiles });

NF.Tool.ReleaseNoteMaker/NF.Tool.ReleaseNoteMaker.Common/Fragments/FragmentResult.cs

@@ -53,5 +53,7 @@ public sealed record class FragmentBasename(string Issue, string Category, int R
         // issue: release-2.0.1
         // category: doc
         // retryCount: 10
+
+        public static FragmentBasename Empty => new FragmentBasename(string.Empty, string.Empty, 0);
     }
 }

NF.Tool.ReleaseNoteMaker/NF.Tool.ReleaseNoteMaker.Common/Template/TemplateRenderer.cs

@@ -80,11 +80,15 @@ public sealed class TemplateRenderer
                     }
 
                     string category = grpCategory.Key;
-                    string categoryDisplayName = config.Types.Find(x => x.Category == category)!.DisplayName;
+                    ReleaseNoteType? releaseNoteTypeOrNull = config.Types.Find(x => x.Category == category);
+                    if (releaseNoteTypeOrNull != null)
                     {
-                        List<string> issues = grpCategory.Select(x => x.FragmentBasename.Issue).OrderBy(IssueParts.IssueKey).ToList();
-                        List<string> formattedIssues = issues.Select(x => Issue.RenderIssue(issueFormat, x)).ToList();
-                        categories.Add(new Category(categoryDisplayName, contents, formattedIssues));
+                        string categoryDisplayName = releaseNoteTypeOrNull.DisplayName;
+                        {
+                            List<string> issues = grpCategory.Select(x => x.FragmentBasename.Issue).OrderBy(IssueParts.IssueKey).ToList();
+                            List<string> formattedIssues = issues.Select(x => Issue.RenderIssue(issueFormat, x)).ToList();
+                            categories.Add(new Category(categoryDisplayName, contents, formattedIssues));
+                        }
                     }
                 }
 

NF.Tool.ReleaseNoteMaker/NF.Tool.ReleaseNoteMaker.Tests/FormatterTests.cs

@@ -71,6 +71,7 @@ public async Task TestBasic()
                 new FragmentContent("", new FragmentBasename("9", "feature", 0), "Foo added."),
                 new FragmentContent("", new FragmentBasename("3", "feature", 0), "Multi-line\nhere"),
                 new FragmentContent("", new FragmentBasename("baz", "feature", 0), "Fun!"),
+                new FragmentContent("Names", FragmentBasename.Empty, ""),
                 new FragmentContent("Web", new FragmentBasename("3", "bugfix", 0), "Web fixed."),
                 new FragmentContent("Web", new FragmentBasename("2", "bugfix", 0), "Multi-line bulleted\n- fix\n- here"),
             };
@@ -105,6 +106,11 @@ public async Task TestBasic()
 - bar, #1, #9, #142
 
 
+## Names
+
+No significant changes.
+
+
 ## Web
 
 ### Bugfixes
@@ -153,6 +159,11 @@ public async Task TestBasic()
 [142]: https://github.com/twisted/towncrier/issues/142
 
 
+## Names
+
+No significant changes.
+
+
 ## Web
 
 ### Bugfixes