remove hidden items

ex.moon

@@ -30,10 +30,8 @@ other_hash: {
     key_4: ["five" 6 7.8]
 }
 
-item_one: "this is item one"
-
 # we may reference an item that was defined earlier
-item_two: item_one
+repeat_hash: hash
 
 # items can be hidden.  i.e., they're only valid in the parse and eval stage as
 # intermediate values internal to the config file; they are *not* visible to

main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 )
 
 func input(n int) io.ReadCloser {
@@ -63,6 +64,11 @@ func eval(r io.Reader) (map[string]interface{}, error) {
 	if _, err := n.eval(ctx); err != nil {
 		return nil, fmt.Errorf("eval error: %s\n", err)
 	}
+	for name, _ := range ctx {
+		if strings.HasPrefix(name, ".") {
+			delete(ctx, name)
+		}
+	}
 	return ctx, nil
 }