make posix style flags

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## [v2.0.0](https://github.com/containeroo/otpgen/tree/v2.0.0) (2021-04-22)
+
+[All Commits](https://github.com/containeroo/otpgen/compare/v1.0.0...v2.0.0)
+
+**Caution!** The flags have changed since v1.0.0! Please refer to the readme file for more information.
+
+**New features:**
+
+- use POSIX/GNU-style `--flags`
+
 ## [v1.0.0](https://github.com/containeroo/otpgen/tree/v1.0.0) (2021-04-14)
 
 Initial release

README.md

@@ -6,6 +6,5 @@ A small cli tool to generate TOTP (Time-based One-time Password) tokens.
 
 ```
 Usage of otpgen:
-  -secretKey string
-        supply a valid TOTP secret key to generate a token from
+  -s, --secretkey string   supply a valid TOTP secret key to generate a token from
 ```

go.mod

@@ -2,4 +2,7 @@ module github.com/containeroo/otpgen
 
 go 1.16
 
-require github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119
+require (
+	github.com/spf13/pflag v1.0.5
+	github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119
+)

go.sum

@@ -1,2 +1,4 @@
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119 h1:YyPWX3jLOtYKulBR6AScGIs74lLrJcgeKRwcbAuQOG4=
 github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119/go.mod h1:/nuTSlK+okRfR/vnIPqR89fFKonnWPiZymN5ydRJkX8=

main.go

@@ -1,17 +1,17 @@
 package main
 
 import (
-	"flag"
 	"fmt"
+	flag "github.com/spf13/pflag"
 	"github.com/xlzd/gotp"
 	"log"
 )
 
 func main() {
-	secretKey := flag.String("secretKey", "", "supply a valid TOTP secret key to generate a token from")
+	secretKey := flag.StringP("secretkey", "s","", "supply a valid TOTP secret key to generate a token from")
 	flag.Parse()
 	if *secretKey == "" {
-		log.Fatal("secretKey cannot be empty")
+		log.Fatal("secretkey cannot be empty")
 	}
 	fmt.Print(gotp.NewDefaultTOTP(*secretKey).Now())
 }