feat: - is for stdin now

1 files changed, 20 insertions, 10 deletions

diff --git a/main.go b/main.go
index 38f131e..fb90bd6 100644
--- a/main.go
+++ b/main.go
@@ -103,22 +103,24 @@ func (prf *preReleaseVersion) incPreRelease() (semver.Version, error) {
 }
 
 var (
-	validArgs         = []string{"major", "minor", "patch"}
+	validPartArgs     = []string{"major", "minor", "patch"}
 	preReleaseFmtArgs = make(map[string]string)
 	preRelease        bool
 	rootCmd           = &cobra.Command{
-		Use:       "semverbump part [major|minor|patch] file [-|file]",
-		Short:     "A tool for bumping semver git tags.",
-		ValidArgs: validArgs,
-		Args:      cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
-		Long:      `Inspired by the python bump2version tool.`,
+		Use:   "bumpver part [major|minor|patch] file [-|file]",
+		Short: "A tool for bumping semver git tags.",
+		Args:  cobra.MatchAll(cobra.ExactArgs(2)),
+		Long:  `Inspired by the python bump2version tool.`,
 		RunE: func(cmd *cobra.Command, argz []string) error {
 			part := argz[0]
 			var err error
 			if err := checkArgPart(part); err != nil {
 				return err
 			}
-			inputScanner := scannerFromInput(cmd.InOrStdin())
+			inputScanner, err := inOrStdinOrFile(cmd.InOrStdin(), argz[1])
+			if err != nil {
+				return err
+			}
 			tags := []*semver.Version{}
 			for inputScanner.Scan() {
 				verText := inputScanner.Text()
@@ -184,14 +186,22 @@ func latestTag(tags []*semver.Version) *semver.Version {
 	return tags[numTags-1]
 }
 
-func scannerFromInput(inputReader io.Reader) *bufio.Scanner {
+func inOrStdinOrFile(inputReader io.Reader, path string) (*bufio.Scanner, error) {
 	scanner := bufio.NewScanner(inputReader)
+	// setup file scanner
+	if path != "-" {
+		file, err := os.Open(path)
+		if err != nil {
+			return &bufio.Scanner{}, err
+		}
+		scanner = bufio.NewScanner(file)
+	}
 	scanner.Split(bufio.ScanLines)
-	return scanner
+	return scanner, nil
 
 }
 func checkArgPart(arg string) error {
-	isValidPart := slices.Contains(validArgs, arg)
+	isValidPart := slices.Contains(validPartArgs, arg)
 	if !isValidPart {
 		return errors.New("A valid arg part is required")