add special warning for rc3 old-style links

(the format used last year is no longer applicable to this year's event)

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/Properties.hs b/lib/Properties.hs
index b15ea15..c278351 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -35,7 +35,7 @@ import           LintConfig    (LintConfig (..))
 import           LintWriter    (LintWriter, adjust, askContext, askFileDepth,
                                 complain, dependsOn, forbid, lintConfig,
                                 offersBadge, offersEntrypoint, suggest, warn)
-import           Paths         (PathResult (..), RelPath (..), parsePath)
+import           Paths         (PathResult (..), RelPath (..), parsePath, isOldStyle)
 import           Types         (Dep (Link, Local, LocalMap, MapLink))
 import           Uris          (SubstError (..), applySubst)
 
@@ -323,7 +323,10 @@ checkTileLayerProperty p@(Property name _value) = case name of
       forbidEmptyLayer
       unwrapURI (Proxy @"map") p
         (dependsOn . MapLink)
-        (dependsOn . LocalMap)
+        (\path -> do
+            if isOldStyle path
+              then complain "Old-Style inter-repository links (using {<placeholder>}) cannot be used at rC3 2021; please use world:// instead (cf. howto.rc3.world)."
+              else dependsOn . LocalMap $ path)
     "exitSceneUrl" ->
       deprecatedUseInstead "exitUrl"
     "exitInstance" ->