feat: Support new sub-command "delete"

internal/manager.go

@@ -1,6 +1,7 @@
 package internal
 
 import (
+	"fmt"
 	"strconv"
 	"strings"
 
@@ -74,6 +75,25 @@ func (m *Manager) GetVer() (string, error) {
 	return m.Prefix + v.String(), nil
 }
 
+func (m *Manager) DeleteVer() (string, error) {
+	{
+		vold, err := m.getVer()
+		if err != nil {
+			return "", fmt.Errorf("failed to get current ver: %w", err)
+		}
+		if err := m.deleteVer(vold); err != nil {
+			return "", fmt.Errorf("failed to delete ver: %w", err)
+		}
+	}
+	{
+		vnew, err := m.getVer()
+		if err != nil {
+			return "", fmt.Errorf("failed to refetch new ver: %w", err)
+		}
+		return m.Prefix + vnew.String(), nil
+	}
+}
+
 func (m *Manager) UpdateMajor(pre []semver.PRVersion, build, msg []string, file string) (string, string, error) {
 	return m.update(pre, build, msg, file, func(u Updater) UpdatePre { return u.Major() })
 }

main.go

@@ -35,6 +35,7 @@ func main() {
 	app.Flag("ancestors", "With ancestor versions (vN and vN.N)").Envar("GIT_VERTAG_ANCESTORS").BoolVar(&ancestors)
 
 	getCmd := app.Command("get", "Gets the current version tag.").Default()
+	deleteCmd := app.Command("delete", "Deletes the current version tag.")
 	majorCmd := app.Command("major", "Creates a tag for the next major version and prints it.")
 	minorCmd := app.Command("minor", "Creates a tag for the next minor version and prints it.")
 	patchCmd := app.Command("patch", "Creates a tag for the next patch version and prints it.")
@@ -94,6 +95,13 @@ func main() {
 		}
 		fmt.Println(v)
 
+	case deleteCmd.FullCommand():
+		v, err := mgr.DeleteVer()
+		if err != nil {
+			return
+		}
+		fmt.Println(v)
+
 	case majorCmd.FullCommand():
 		printResult(mgr.UpdateMajor(pre, build, message, file))