subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226

git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208
git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789

1 files changed, 22 insertions, 0 deletions

diff --git a/users/wpcarro/scratch/groceries/export.hs b/users/wpcarro/scratch/groceries/export.hs
new file mode 100644
index 000000000000..ed43c9a3e887
--- /dev/null
+++ b/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 ()