1 files changed, 27 insertions, 0 deletions
diff --git a/app/Issue/Meta.hs b/app/Issue/Meta.hs
new file mode 100644
index 0000000..d9851ec
--- /dev/null
+++ b/app/Issue/Meta.hs
@@ -0,0 +1,27 @@
+module Issue.Meta
+  ( Meta (..),
+    getMeta,
+  )
+where
+
+import Data.Text qualified as T
+import Issue (Issue (..))
+import Issue.Tag (Tag, tagValue)
+
+data Meta = Meta
+  { referencedBy :: [(Issue, Tag)]
+  }
+  deriving (Show)
+
+getMeta :: [Issue] -> Issue -> Meta
+getMeta issues issue =
+  Meta
+    { referencedBy =
+        concatMap
+          ( \issueOther ->
+              let tagsRelevant =
+                    filter (\tag -> tagValue tag == fmap T.pack issue.id) issueOther.tags
+               in map (\tag -> (issue, tag)) tagsRelevant
+          )
+          issues
+    }