show version

go.mod

@@ -3,7 +3,11 @@ module git.milar.in/milarin/format
 go 1.18
 
 require (
-	github.com/fatih/color v1.13.0 // indirect
+	git.milar.in/milarin/buildinfo v1.0.0
+	github.com/fatih/color v1.13.0
+)
+
+require (
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	golang.org/x/sys v0.0.0-20220517195934-5e4e11fc645e // indirect

go.sum

@@ -1,3 +1,5 @@
+git.milar.in/milarin/buildinfo v1.0.0 h1:tw98GupUYl/0a/3aPGuezhE4wseycOSsbcLp70hy60U=
+git.milar.in/milarin/buildinfo v1.0.0/go.mod h1:arI9ZoENOgcZcanv25k9y4dKDUhPp0buJrlVerGruas=
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=

main.go

@@ -10,6 +10,8 @@ import (
 	"strconv"
 	"strings"
 	"unicode/utf8"
+
+	"git.milar.in/milarin/buildinfo"
 )
 
 var (
@@ -45,6 +47,8 @@ var (
 	// it may be useful to have a boolean flag for this behavior
 	lineParseAmount = flag.Int("n", 1, "amount of lines to feed into input pattern")
 
+	showVersion = flag.Bool("v", false, "show version and exit")
+
 	replacePattern     = regexp.MustCompile(`\{(\d+)(?::(.*?))?(?::(.*?))?(?::(.*?))?\}`)
 	numMutationPattern = regexp.MustCompile(`([+\-*/])(\d+|\((\d+)\))`)
 )
@@ -52,6 +56,11 @@ var (
 func main() {
 	flag.Parse()
 
+	if *showVersion {
+		buildinfo.Print(buildinfo.Options{})
+		return
+	}
+
 	pattern, err := regexp.Compile(*input)
 	if err != nil {
 		panic(err)