feat: support tag ranges

1_parser/parser.go

@@ -3,6 +3,7 @@ package parser
 import (
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/axetroy/changelog/internal/client"
@@ -24,6 +25,7 @@ type Scope struct {
 var (
 	regShortHash = regexp.MustCompile(`^[a-z\d]{7}$`)
 	regLongHash  = regexp.MustCompile(`^[a-z\d]{40}$`)
+	regTag       = regexp.MustCompile(`^tag:(\d+)$`)
 )
 
 func getCommitFromHEAD(git *client.GitClient) (*object.Commit, error) {
@@ -69,6 +71,22 @@ func getCommit(git *client.GitClient, version string, isStart bool) (*object.Com
 		}
 
 		return commit, nil
+	} else if regTag.MatchString(version) {
+		matcher := regTag.FindStringSubmatch(version)
+
+		tagIndex, err := strconv.ParseInt(matcher[1], 10, 10)
+
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		tag, err := git.TagN(int(tagIndex))
+
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		return tag.Commit, nil
 	} else if regShortHash.MatchString(version) {
 		return git.CommitByShort(version)
 	} else if regLongHash.MatchString(version) {

2_extractor/extractor.go

@@ -72,10 +72,6 @@ func Extract(g *client.GitClient, scope *parser.Scope) ([]*ExtractSplice, error)
 
 	index := 0
 
-	splice := &ExtractSplice{
-		Name: "Unreleased",
-	}
-
 	for {
 		if index == len(commits) {
 			break
@@ -84,19 +80,60 @@ func Extract(g *client.GitClient, scope *parser.Scope) ([]*ExtractSplice, error)
 		commit := commits[index]
 
 		if tag := getTagOfCommit(scope.Tags, commit); tag != nil {
-			if splice.Commit != nil {
-				splices = append(splices, splice)
-			}
-			splice = &ExtractSplice{
+			splice := &ExtractSplice{
 				Name: tag.Name,
 				Tag:  tag,
 			}
+			index++
+		internalLoop:
+			for {
+				if index == len(commits) {
+					break internalLoop
+				}
+
+				nextCommit := commits[index]
+
+				if t := getTagOfCommit(scope.Tags, nextCommit); t != nil {
+					break internalLoop
+				}
+
+				if splice.Commit == nil {
+					splice.Commit = make([]*object.Commit, 0)
+				}
+
+				splice.Commit = append(splice.Commit, nextCommit)
+
+				index++
+			}
+
 			splices = append(splices, splice)
-		}
+		} else {
+			splice := &ExtractSplice{
+				Name: "Unreleased",
+			}
+
+		internalLoop2:
+			for {
+				if index == len(commits) {
+					break internalLoop2
+				}
+
+				nextCommit := commits[index]
 
-		splice.Commit = append(splice.Commit, commit)
+				if t := getTagOfCommit(scope.Tags, nextCommit); t != nil {
+					break internalLoop2
+				}
 
-		index++
+				if splice.Commit == nil {
+					splice.Commit = make([]*object.Commit, 0)
+				}
+
+				splice.Commit = append(splice.Commit, nextCommit)
+
+				index++
+			}
+
+		}
 	}
 
 	return splices, nil

main.go

@@ -47,24 +47,27 @@ OPTIONS:
   --tpl         Specify the directory to be generated.
 
 EXAMPLES:
-  # generate changelog from HEAD to <latest version>
-  $ changelog
+  # generate changelog from HEAD to <latest version>. equivalent to 'changelog HEAD~tag:0'
+	$ changelog
 
   # generate changelog of the specified version
   $ changelog v1.2.0
 
   # generate changelog within the specified range
-  $ changelog v1.3.0~v1.2.0
+	$ changelog v1.3.0~v1.2.0
+
+	# generate changelog from HEAD to <Nth tag>
+	$ changelog ~tag:0
+
+  # generate changelog from <0th tag> to <2th tag>
+  $ changelog tag:0~tag:2
 
   # generate changelog from HEAD to specified version
   $ changelog HEAD~v1.3.0
 
   # generate all changelog
 	$ changelog HEAD~
 
-	# generate all changelog
-  $ changelog HEAD~
-
   # generate changelog from two commit hashes
   $ changelog 770ed02~585445d