cmdx: Add arg helpers

Signed-off-by: arekkas <aeneas@ory.am>

cmdx/args.go

@@ -1,11 +1,35 @@
 package cmdx
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/spf13/cobra"
+	"strings"
+)
 
 func MinArgs(cmd *cobra.Command, args []string, min int) {
 	if len(args) < min {
 		Fatalf(`%s
 
-Expected %d command line arguments but got %d.`, cmd.UsageString(), min, len(args))
+Expected at least %d command line arguments but only got %d.`, cmd.UsageString(), min, len(args))
+	}
+}
+
+func ExactArgs(cmd *cobra.Command, args []string, min int) {
+	if len(args) < min {
+		Fatalf(`%s
+
+Expected exactly %d command line arguments but got %d.`, cmd.UsageString(), min, len(args))
+	}
+}
+
+func RangeArgs(cmd *cobra.Command, args []string, allowed []int) {
+	for _, a := range allowed {
+		if len(args) == a {
+			return
+		}
+	}
+	if len(args) < min {
+		Fatalf(`%s
+
+Expected exact %s command line arguments but got %d.`, cmd.UsageString(), strings.Join(allowed, ", "), len(args))
 	}
 }