cmd/mbf: dump IR of artifact presets

This exposes IR outside test cases, useful for verifying correctness of alternative IR emitters.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -150,6 +150,10 @@ func main() {
 		},
 	)
 
+	{
+		var (
+			flagDump string
+		)
 		c.NewCommand(
 			"cure",
 			"Cure the named artifact and show its path",
@@ -159,15 +163,37 @@ func main() {
 				}
 				if p, ok := rosa.ResolveName(args[0]); !ok {
 					return fmt.Errorf("unsupported artifact %q", args[0])
-			} else {
+				} else if flagDump == "" {
 					pathname, _, err := cache.Cure(rosa.Std.Load(p))
 					if err == nil {
 						log.Println(pathname)
 					}
 					return err
+				} else {
+					f, err := os.OpenFile(
+						flagDump,
+						os.O_WRONLY|os.O_CREATE|os.O_EXCL,
+						0644,
+					)
+					if err != nil {
+						return err
+					}
+
+					if err = cache.EncodeAll(f, rosa.Std.Load(p)); err != nil {
+						_ = f.Close()
+						return err
+					}
+
+					return f.Close()
 				}
 			},
+		).
+			Flag(
+				&flagDump,
+				"dump", command.StringFlag(""),
+				"Write IR to specified pathname and terminate",
 			)
+	}
 
 	c.MustParse(os.Args[1:], func(err error) {
 		if cache != nil {