cli args improvements

cmd/oplcli.go

@@ -6,15 +6,16 @@ import (
 )
 
 type ScanCmd struct {
-	Files []string `arg:"positional"`
+	Files []string `arg:"positional,required"`
 }
 
 type RenameCmd struct {
-	Files []string `arg:"positional"`
+	Files []string `arg:"positional,required"`
 }
 
 type ArtCmd struct {
-	Files []string `arg:"positional"`
+	Files           []string `arg:"positional,required"`
+	OutputDirectory string   `arg:"--output,-o" help:"where to download art files" default:"."`
 }
 
 type args struct {
@@ -25,23 +26,14 @@ type args struct {
 
 func Run() {
 	var args args
-	p := arg.MustParse(&args)
+	arg.MustParse(&args)
 
 	switch {
 	case args.Scan != nil:
-		if len(args.Scan.Files) == 0 {
-			p.Fail("Provide at least one file to scan")
-		}
 		oplcli.Scan(args.Scan.Files, oplcli.Config{})
 	case args.Rename != nil:
-		if len(args.Rename.Files) == 0 {
-			p.Fail("Provide at least one file rename")
-		}
 		oplcli.Rename(args.Rename.Files, oplcli.Config{})
 	case args.Art != nil:
-		if len(args.Art.Files) == 0 {
-			p.Fail("Provide at least one file to download art for")
-		}
-		oplcli.DownloadGameArt(args.Art.Files, oplcli.Config{})
+		oplcli.DownloadGameArt(args.Art.Files, args.Art.OutputDirectory, oplcli.Config{})
 	}
 }