1 files changed, 27 insertions, 0 deletions
diff --git a/new-luxc/source/luxc/cache/influences.lux b/new-luxc/source/luxc/cache/influences.lux
new file mode 100644
index 000000000..a75e1a7a1
--- /dev/null
+++ b/new-luxc/source/luxc/cache/influences.lux
@@ -0,0 +1,27 @@
+(.module:
+  lux
+  (lux (data [text]
+             (coll [list "list/" Fold<List>]
+                   [dict #+ Dict]))))
+
+(type: #export Influences (Dict Text (List Text)))
+
+(def: #export (track to from)
+  (-> Text Text Influences Influences)
+  (|>> (dict.update~ from (list) (|>> (#.Cons to)))
+       (dict.update~ to (list) id)))
+
+(def: (effluents module influences)
+  (-> Text Influences (Maybe (List Text)))
+  (dict.get module influences))
+
+(def: #export (untrack module influences)
+  (-> Text Influences Influences)
+  (case (effluents module influences)
+    (#.Some effluents)
+    (list/fold untrack (dict.remove module influences) effluents)
+
+    #.None
+    influences))
+
+(def: #export empty Influences (dict.new text.Hash<Text>))