specs: Make `pieces` default

So you can have an empty table, if you want.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/spec.rs b/src/spec.rs
index 921a1721ab8897fb44ef0a5a04f844dbfab3fb37..14fc298d4c3e35f3a31127d71aa56980631d27d9 100644 (file)
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -165,7 +165,7 @@ pub struct UrlOnStdout;
 #[derive(Debug,Serialize,Deserialize)]
 pub struct GameSpec {
   #[serde(default="imp::def_table_size")] pub table_size: Pos,
-  pub pieces: Vec<PiecesSpec>,
+  #[serde(default)] pub pieces: Vec<PiecesSpec>,
   #[serde(default="imp::def_table_colour")] pub table_colour: ColourSpec,
   #[serde(default)] pub pcaliases: HashMap<String, Box<dyn PieceSpec>>,
 }