subtree(users/wpcarro): docking briefcase at '24f5a642'

git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c
git-subtree-split: 24f5a642af
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789

users/wpcarro/scratch/groceries/export.hs

@@ -0,0 +1,22 @@
+module Main where
+
+import qualified Data.List as L
+
+(|>) :: a -> (a -> b) -> b
+x |> f = f x
+
+-- | Ignore items with zero quantity (i.e. "0x") and comments (i.e. "#")
+isUndesirableOutput :: String -> Bool
+isUndesirableOutput x =
+  (L.isPrefixOf "- 0x" x) || (L.isPrefixOf "#" x)
+
+-- | Run this to export the grocery list.
+main :: IO ()
+main = do
+  content <- readFile "./list.org"
+  content
+    |> lines
+    |> filter (not . isUndesirableOutput)
+    |> unlines
+    |> putStrLn
+  pure ()