From f52210aef261eda550a562277e2bbb79863849c4 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 17 May 2022 02:10:36 +0100
Subject: [PATCH] Break out ColourSpecExt::resolve

Hrm, maybe this should have been load() ?  This will do for now.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/dice.rs    |  4 +---
 src/imports.rs |  1 +
 src/spec.rs    | 10 ++++++++++
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/dice.rs b/src/dice.rs
index ede7a2b8..cf9df81f 100644
--- a/src/dice.rs
+++ b/src/dice.rs
@@ -157,9 +157,7 @@ impl PieceSpec for Spec {
       index_vec!["".into()]
     };
 
-    let label_colour: Colour = self.label.colour.as_ref()
-      .map(TryInto::try_into).transpose()?
-      .unwrap_or_else(|| Html::lit("black").into());
+    let label_colour = self.label.colour.resolve()?;
 
     if_let!{ Some((nfaces,_)) = nfaces;
              else throw!(SpecError::MultipleFacesRequired) };
diff --git a/src/imports.rs b/src/imports.rs
index 7c8f9d5b..062f51e0 100644
--- a/src/imports.rs
+++ b/src/imports.rs
@@ -103,6 +103,7 @@ pub use crate::shapelib;
 pub use crate::shapelib::{ItemEnquiryData, LibraryEnquiryData};
 pub use crate::shapelib::{LibraryLoadError};
 pub use crate::spec::*;
+pub use crate::spec::imp::ColourSpecExt as _;
 pub use crate::spec::piece_specs::{FaceColourSpecs, SimpleCommon};
 pub use crate::updates::*;
 pub use crate::utils::*;
diff --git a/src/spec.rs b/src/spec.rs
index 31e4eff0..8e00709a 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -606,6 +606,16 @@ pub mod imp {
     }
   }
 
+  #[ext(pub, name=ColourSpecExt)]
+  impl Option<ColourSpec> {
+    #[throws(UnsupportedColourSpec)]
+    fn resolve(&self) -> Colour {
+      self.as_ref()
+        .map(TryInto::try_into).transpose()?
+        .unwrap_or_else(|| Html::lit("black").into())
+    }
+  }
+
   impl TryFrom<&ColourSpec> for Colour {
     type Error = UnsupportedColourSpec;
     #[throws(UnsupportedColourSpec)]
-- 
2.30.2