simple map-map link dependency checking

This is purely based on a set difference, i.e. it won't catch stupid
things like a map linking to itself, a map link going only one-way, etc.

Also, it only handles map links; it doesn't check if all ressource files
referenced by a map actually exist.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/Properties.hs b/lib/Properties.hs
index 86acda9..877afe1 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -13,7 +13,8 @@ import           Tiled2        (Layer (..), Property (..), PropertyValue (..),
 import           Util          (layerIsEmpty, prettyprint)
 
 import           LintWriter    (LintWriter, askContext, askFileDepth, complain,
-                                dependsOn, forbid, suggest, warn)
+                                dependsOn, forbid, offersEntrypoint, suggest,
+                                warn)
 import           Paths         (RelPath (..), parsePath)
 import           Types         (Dep (Link, Local, LocalMap, MapLink))
 
@@ -142,6 +143,8 @@ checkLayerProperty p@(Property name _value) = case name of
         else unwrapPath link (dependsOn . LocalMap)
     "startLayer" -> do
       forbidEmptyLayer
+      layer <- askContext
+      offersEntrypoint $ layerName layer
       unwrapBool p $ \case
         True  -> pure ()
         False -> complain "startLayer must be set to true"