From 9cd5b11547e2805359271703944e316cc071eb67 Mon Sep 17 00:00:00 2001
From: cos <cos>
Date: Fri, 1 Dec 2023 23:58:06 +0100
Subject: Add day01, 2023 (haskell)

---
 2023/haskell/day01/part1.hs | 17 +++++++++++++++++
 2023/haskell/day01/part2.hs | 31 +++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 2023/haskell/day01/part1.hs
 create mode 100644 2023/haskell/day01/part2.hs

diff --git a/2023/haskell/day01/part1.hs b/2023/haskell/day01/part1.hs
new file mode 100644
index 0000000..65ea098
--- /dev/null
+++ b/2023/haskell/day01/part1.hs
@@ -0,0 +1,17 @@
+import Data.Char
+import System.Environment
+import System.IO
+
+main :: IO ()
+main = do
+  args <- getArgs
+  case args of
+    [filename] -> do
+      fh <- openFile filename ReadMode
+      lines <- lines <$> readFile filename
+      let digits = map (\line -> [c | c <- line, isDigit c ]) lines
+      let numbers = map (\line -> head line : [last line]) digits
+      let ints = map (\num -> read num :: Int ) numbers
+      let part1 = sum ints
+      print part1
+    _ -> putStrLn "Missing input filename."
diff --git a/2023/haskell/day01/part2.hs b/2023/haskell/day01/part2.hs
new file mode 100644
index 0000000..a99fabf
--- /dev/null
+++ b/2023/haskell/day01/part2.hs
@@ -0,0 +1,31 @@
+import Data.Char
+import Data.List
+import System.Environment
+import System.IO
+
+fixInput str
+  | "one" `isPrefixOf` str = '1'
+  | "two" `isPrefixOf` str = '2'
+  | "three" `isPrefixOf` str = '3'
+  | "four" `isPrefixOf` str = '4'
+  | "five" `isPrefixOf` str = '5'
+  | "six" `isPrefixOf` str = '6'
+  | "seven" `isPrefixOf` str = '7'
+  | "eight" `isPrefixOf` str = '8'
+  | "nine" `isPrefixOf` str = '9'
+  | otherwise = head str
+
+main :: IO ()
+main = do
+  args <- getArgs
+  case args of
+    [filename] -> do
+      fh <- openFile filename ReadMode
+      lines <- lines <$> readFile filename
+      let fixed = [ [ fixInput part | part <- tails line, part /= "" ] | line <- lines ]
+      let digits = map (\line -> [c | c <- line, isDigit c ]) fixed
+      let numbers = map (\line -> head line : [last line]) digits
+      let ints = map (\num -> read num :: Int ) numbers
+      let part2 = sum ints
+      print part2
+    _ -> putStrLn "Missing input filename."
-- 
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