fix: parse single version tag:N incorrect

1_parser/parser.go

@@ -86,6 +86,10 @@ func getCommit(git *client.GitClient, version string, isStart bool) (*object.Com
 			return nil, errors.WithStack(err)
 		}
 
+		if tag == nil {
+			return nil, nil
+		}
+
 		return tag.Commit, nil
 	} else if regShortHash.MatchString(version) {
 		return git.CommitByShort(version)
@@ -132,12 +136,24 @@ func Parse(git *client.GitClient, ranges string) (*Scope, error) {
 			versions = append(versions, "")
 		}
 	} else if len(versions) == 1 {
-		// make sure the length is always 2
+		var tag *client.Tag
 
-		tag, err := git.TagName(ranges)
+		if regTag.MatchString(ranges) {
+			matcher := regTag.FindStringSubmatch(ranges)
 
-		if err != nil {
-			return nil, errors.WithStack(err)
+			tagIndex, err := strconv.ParseInt(matcher[1], 10, 10)
+
+			if err != nil {
+				return nil, errors.WithStack(err)
+			}
+
+			if tag, err = git.TagN(int(tagIndex)); err != nil {
+				return nil, errors.WithStack(err)
+			}
+		} else {
+			if tag, err = git.TagName(ranges); err != nil {
+				return nil, errors.WithStack(err)
+			}
 		}
 
 		if tag != nil {

2_extractor/extractor.go

@@ -106,27 +106,29 @@ func Extract(g *client.GitClient, scope *parser.Scope) ([]*ExtractSplice, error)
 
 			splices = append(splices, splice)
 		} else {
-			splice := &ExtractSplice{
+			item := &ExtractSplice{
 				Name: "Unreleased",
 			}
 
 		internalLoop2:
 			for {
 				if index == len(commits) {
+					splices = append(splices, item)
 					break internalLoop2
 				}
 
 				nextCommit := commits[index]
 
 				if t := getTagOfCommit(scope.Tags, nextCommit); t != nil {
+					splices = append(splices, item)
 					break internalLoop2
 				}
 
-				if splice.Commit == nil {
-					splice.Commit = make([]*object.Commit, 0)
+				if item.Commit == nil {
+					item.Commit = make([]*object.Commit, 0)
 				}
 
-				splice.Commit = append(splice.Commit, nextCommit)
+				item.Commit = append(item.Commit, nextCommit)
 
 				index++
 			}