diff --git a/.hspec b/.hspec
new file mode 100644
index 0000000..b43ecad
--- /dev/null
+++ b/.hspec
@@ -0,0 +1,2 @@
+--rerun
+--rerun-all-on-success
diff --git a/README.org b/README.org
new file mode 100644
index 0000000..e69de29
diff --git a/aoc.cabal b/aoc.cabal
index ed8bad2..f58726a 100644
--- a/aoc.cabal
+++ b/aoc.cabal
@@ -14,11 +14,41 @@ license:        MIT
 build-type:     Simple
 extra-source-files:
     README.org
+data-dir:       data
 
 library
   exposed-modules:
       AoC
-      AoC.Internal
+      AoC.Day
+      AoC.Riddle
+      AoC.Util
+      AoC.Y2023
+      AoC.Y2023.D01
+      AoC.Y2023.D02
+      AoC.Y2023.D03
+      AoC.Y2023.D04
+      AoC.Y2023.D05
+      AoC.Y2023.D06
+      AoC.Y2023.D07
+      AoC.Y2023.D08
+      AoC.Y2023.D09
+      AoC.Y2023.D10
+      AoC.Y2023.D11
+      AoC.Y2023.D12
+      AoC.Y2023.D13
+      AoC.Y2023.D14
+      AoC.Y2023.D15
+      AoC.Y2023.D16
+      AoC.Y2023.D17
+      AoC.Y2023.D18
+      AoC.Y2023.D19
+      AoC.Y2023.D20
+      AoC.Y2023.D21
+      AoC.Y2023.D22
+      AoC.Y2023.D23
+      AoC.Y2023.D24
+      AoC.Y2023.D25
+      AoC.Year
   other-modules:
       Paths_aoc
   autogen-modules:
@@ -29,7 +59,8 @@ library
       BlockArguments
       OverloadedStrings
       ImportQualifiedPost
-  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
+      DerivingStrategies
+  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missing-kind-signatures -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
   build-depends:
       base
     , containers
@@ -38,7 +69,7 @@ library
     , text
   mixins:
       base hiding (Prelude)
-    , relude (Relude as Prelude)
+    , relude (Relude as Prelude, Relude, Relude.Unsafe, Relude.Extra.Enum)
   default-language: GHC2021
 
 executable aoc
@@ -53,7 +84,8 @@ executable aoc
       BlockArguments
       OverloadedStrings
       ImportQualifiedPost
-  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
+      DerivingStrategies
+  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missing-kind-signatures -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
   build-depends:
       aoc
     , base
@@ -63,7 +95,7 @@ executable aoc
     , text
   mixins:
       base hiding (Prelude)
-    , relude (Relude as Prelude)
+    , relude (Relude as Prelude, Relude, Relude.Unsafe, Relude.Extra.Enum)
   default-language: GHC2021
 
 test-suite doctest
@@ -79,7 +111,8 @@ test-suite doctest
       BlockArguments
       OverloadedStrings
       ImportQualifiedPost
-  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
+      DerivingStrategies
+  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missing-kind-signatures -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
   build-tool-depends:
       doctest:doctest
   build-depends:
@@ -91,14 +124,16 @@ test-suite doctest
     , text
   mixins:
       base hiding (Prelude)
-    , relude (Relude as Prelude)
+    , relude (Relude as Prelude, Relude, Relude.Unsafe, Relude.Extra.Enum)
   default-language: Haskell2010
 
 test-suite spec
   type: exitcode-stdio-1.0
   main-is: Spec.hs
   other-modules:
-      AoCSpec.InternalSpec
+      AoCSpec.UtilSpec
+      AoCSpec.Y2023Spec
+      SpecHook
       Paths_aoc
   autogen-modules:
       Paths_aoc
@@ -108,7 +143,8 @@ test-suite spec
       BlockArguments
       OverloadedStrings
       ImportQualifiedPost
-  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
+      DerivingStrategies
+  ghc-options: -Weverything -Wno-implicit-prelude -Wno-missing-import-lists -Wno-missing-kind-signatures -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode -Wno-missing-local-signatures -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -fdefer-typed-holes -Wno-unused-packages
   cpp-options: -DTEST
   build-tool-depends:
       hspec-discover:hspec-discover
@@ -124,5 +160,5 @@ test-suite spec
     , text
   mixins:
       base hiding (Prelude)
-    , relude (Relude as Prelude)
+    , relude (Relude as Prelude, Relude, Relude.Unsafe, Relude.Extra.Enum)
   default-language: GHC2021
diff --git a/data/Y2023/D01/riddle b/data/Y2023/D01/riddle
new file mode 100644
index 0000000..979a9c6
--- /dev/null
+++ b/data/Y2023/D01/riddle
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index 0000000..e69de29
diff --git a/data/Y2023/D04/riddle b/data/Y2023/D04/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D05/riddle b/data/Y2023/D05/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D06/riddle b/data/Y2023/D06/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D07/riddle b/data/Y2023/D07/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D08/riddle b/data/Y2023/D08/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D09/riddle b/data/Y2023/D09/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D10/riddle b/data/Y2023/D10/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D11/riddle b/data/Y2023/D11/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D12/riddle b/data/Y2023/D12/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D13/riddle b/data/Y2023/D13/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D14/riddle b/data/Y2023/D14/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D15/riddle b/data/Y2023/D15/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D16/riddle b/data/Y2023/D16/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D17/riddle b/data/Y2023/D17/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D18/riddle b/data/Y2023/D18/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D19/riddle b/data/Y2023/D19/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D20/riddle b/data/Y2023/D20/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D21/riddle b/data/Y2023/D21/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D22/riddle b/data/Y2023/D22/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D23/riddle b/data/Y2023/D23/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D24/riddle b/data/Y2023/D24/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/data/Y2023/D25/riddle b/data/Y2023/D25/riddle
new file mode 100644
index 0000000..e69de29
diff --git a/gen.sh b/gen.sh
new file mode 100755
index 0000000..a065029
--- /dev/null
+++ b/gen.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+Y="$1"; shift
+if [ -z "$Y" ]; then
+	Y="$(date +%Y)"
+fi
+
+fday="$1"; shift
+tday="$1"; shift
+
+if [ -z "$fday" ]; then
+	fday=1
+	tday=25
+fi
+if [ -z "$tday" ]; then
+	tday="${fday}"
+fi
+
+days=($(seq $fday $tday))
+
+if ! grep -q "Y${Y}" src/AoC/Year.hs; then
+	sed -i -e "s/\(\(\s\+\)= Y0000\)/\1\n\2| Y${Y}/" src/AoC/Year.hs
+fi
+
+mkdir -p "src/AoC/Y${Y}"
+if ! test -f "src/AoC/Y${Y}.hs"; then
+	sed -e "s/Y0000/Y${Y}/g" template/Y0000.hs > "src/AoC/Y${Y}.hs"
+fi
+
+for d in "${days[@]}"; do
+	d=$(printf "%02d" "$d")
+	mkdir -p "data/Y${Y}/D${d}"
+	touch "data/Y${Y}/D${d}/riddle"
+	touch "data/Y${Y}/D${d}/result"
+
+	if ! test -f "src/AoC/Y${Y}/D${d}.hs"; then
+		sed -e "s/Y0000/Y${Y}/g" -e "s/D00/D${d}/g" template/D00.hs > "src/AoC/Y${Y}/D${d}.hs"
+	fi
+done
diff --git a/package.yaml b/package.yaml
index 6b63cc4..7d8239b 100644
--- a/package.yaml
+++ b/package.yaml
@@ -9,13 +9,15 @@ description: "Advent-Of-Code"
 extra-source-files:
   - README.org
 
+data-dir: data
+
 dependencies:
   - name: base
     mixin:
       - hiding (Prelude)
   - name: relude
     mixin:
-      - (Relude as Prelude)
+      - (Relude as Prelude, Relude, Relude.Unsafe, Relude.Extra.Enum)
   - containers
   - text
   - megaparsec
@@ -24,6 +26,7 @@ ghc-options:
   - -Weverything
   - -Wno-implicit-prelude
   - -Wno-missing-import-lists # Requires explicit imports of _every_ function (e.g. ‘$’); too strict
+  - -Wno-missing-kind-signatures
   - -Wno-missed-specialisations # When GHC can’t specialize a polymorphic function. No big deal and requires fixing underlying libraries to solve.
   - -Wno-all-missed-specialisations # See missed-specialisations
   - -Wno-unsafe # Don’t use Safe Haskell warnings
@@ -40,9 +43,11 @@ default-extensions:
   - BlockArguments
   - OverloadedStrings
   - ImportQualifiedPost
+  - DerivingStrategies
 
 library:
   source-dirs: src
+  generated-other-modules: Paths_aoc
   verbatim:
     default-language: GHC2021
 
diff --git a/src/AoC.hs b/src/AoC.hs
index 7a3c6dc..3431b23 100644
--- a/src/AoC.hs
+++ b/src/AoC.hs
@@ -1,21 +1,32 @@
-{-# LANGUAGE OverloadedStrings #-}
-
 module AoC (
   defaultMain,
+  runAoC,
+  module AoC.Day,
+  module AoC.Year,
 ) where
 
+import AoC.Day
+import AoC.Riddle
+import AoC.Year
+
 import Control.Exception qualified as Exception
 import System.IO (hPutStrLn)
 import System.IO.Error qualified as IOError
 
-runAoC :: [String] -> IO ()
-runAoC _args = putStrLn "Hello"
+import AoC.Y2023 qualified as Y2023
+
+runAoC :: (MonadIO m) => Year -> Day -> m (Either Text Solution)
+runAoC y d = do
+  riddle <- loadRiddle y d
+  solve y d riddle
+
+solve :: (MonadIO m) => Year -> Day -> Riddle -> m (Either Text Solution)
+solve Y2023 = Y2023.solve
+solve y = \_ _ -> pure $ Left $ show y <> ": not implementedi"
 
 handleError :: IOError.IOError -> IO ()
 handleError e = do
   hPutStrLn stderr $ "I ran into an issue: " <> show e
 
 defaultMain :: IO ()
-defaultMain = do
-  args <- getArgs
-  Exception.catch (runAoC args) handleError
+defaultMain = Exception.catch (runAoC Y2023 D01 >>= print) handleError
diff --git a/src/AoC/Day.hs b/src/AoC/Day.hs
new file mode 100644
index 0000000..76232c6
--- /dev/null
+++ b/src/AoC/Day.hs
@@ -0,0 +1,29 @@
+module AoC.Day (Day (..)) where
+
+data Day
+  = D01
+  | D02
+  | D03
+  | D04
+  | D05
+  | D06
+  | D07
+  | D08
+  | D09
+  | D10
+  | D11
+  | D12
+  | D13
+  | D14
+  | D15
+  | D16
+  | D17
+  | D18
+  | D19
+  | D20
+  | D21
+  | D22
+  | D23
+  | D24
+  | D25
+  deriving stock (Read, Show, Eq, Ord, Enum)
diff --git a/src/AoC/Riddle.hs b/src/AoC/Riddle.hs
new file mode 100644
index 0000000..f9ad279
--- /dev/null
+++ b/src/AoC/Riddle.hs
@@ -0,0 +1,20 @@
+module AoC.Riddle (
+  Riddle (..),
+  Error (..),
+  Solution (..),
+  loadRiddle,
+) where
+
+import AoC.Util (readFileUtf8)
+
+import AoC.Day
+import AoC.Year
+
+type Riddle = Text
+type Error = Text
+type Solution = [Integer]
+
+loadRiddle :: (MonadIO m) => Year -> Day -> m Riddle
+loadRiddle y d = readFileUtf8 inputFile
+ where
+  inputFile = intercalate "/" ["data", show y, show d, "riddle"]
diff --git a/src/AoC/Internal.hs b/src/AoC/Util.hs
similarity index 89%
rename from src/AoC/Internal.hs
rename to src/AoC/Util.hs
index d3d22c9..aa91a52 100644
--- a/src/AoC/Internal.hs
+++ b/src/AoC/Util.hs
@@ -1,5 +1,5 @@
 -- | Internal module in order to facilitate testability.
-module AoC.Internal (solveRiddle, readFileUtf8) where
+module AoC.Util (solveRiddle, readFileUtf8) where
 
 readFileUtf8 :: (MonadIO m) => FilePath -> m Text
 readFileUtf8 = fmap (decodeUtf8With lenientDecode) . readFileBS
diff --git a/src/AoC/Y2023.hs b/src/AoC/Y2023.hs
new file mode 100644
index 0000000..389adc6
--- /dev/null
+++ b/src/AoC/Y2023.hs
@@ -0,0 +1,57 @@
+module AoC.Y2023 (solve) where
+
+import AoC.Day
+import AoC.Riddle
+
+import AoC.Y2023.D01 qualified as D01
+import AoC.Y2023.D02 qualified as D02
+import AoC.Y2023.D03 qualified as D03
+import AoC.Y2023.D04 qualified as D04
+import AoC.Y2023.D05 qualified as D05
+import AoC.Y2023.D06 qualified as D06
+import AoC.Y2023.D07 qualified as D07
+import AoC.Y2023.D08 qualified as D08
+import AoC.Y2023.D09 qualified as D09
+import AoC.Y2023.D10 qualified as D10
+import AoC.Y2023.D11 qualified as D11
+import AoC.Y2023.D12 qualified as D12
+import AoC.Y2023.D13 qualified as D13
+import AoC.Y2023.D14 qualified as D14
+import AoC.Y2023.D15 qualified as D15
+import AoC.Y2023.D16 qualified as D16
+import AoC.Y2023.D17 qualified as D17
+import AoC.Y2023.D18 qualified as D18
+import AoC.Y2023.D19 qualified as D19
+import AoC.Y2023.D20 qualified as D20
+import AoC.Y2023.D21 qualified as D21
+import AoC.Y2023.D22 qualified as D22
+import AoC.Y2023.D23 qualified as D23
+import AoC.Y2023.D24 qualified as D24
+import AoC.Y2023.D25 qualified as D25
+
+solve :: (MonadIO m) => Day -> Text -> m (Either Error Solution)
+solve D01 = D01.solve
+solve D02 = D02.solve
+solve D03 = D03.solve
+solve D04 = D04.solve
+solve D05 = D05.solve
+solve D06 = D06.solve
+solve D07 = D07.solve
+solve D08 = D08.solve
+solve D09 = D09.solve
+solve D10 = D10.solve
+solve D11 = D11.solve
+solve D12 = D12.solve
+solve D13 = D13.solve
+solve D14 = D14.solve
+solve D15 = D15.solve
+solve D16 = D16.solve
+solve D17 = D17.solve
+solve D18 = D18.solve
+solve D19 = D19.solve
+solve D20 = D20.solve
+solve D21 = D21.solve
+solve D22 = D22.solve
+solve D23 = D23.solve
+solve D24 = D24.solve
+solve D25 = D25.solve
diff --git a/src/AoC/Y2023/D01.hs b/src/AoC/Y2023/D01.hs
new file mode 100644
index 0000000..d7a0c8a
--- /dev/null
+++ b/src/AoC/Y2023/D01.hs
@@ -0,0 +1,24 @@
+module AoC.Y2023.D01 (solve) where
+
+import AoC.Riddle
+import Data.Char (digitToInt, isDigit)
+import Relude.Unsafe (fromJust)
+
+digits :: String -> [Int]
+digits = fmap digitToInt . filter isDigit
+
+digits' :: String -> NonEmpty Int
+digits' = fromJust . nonEmpty . digits
+
+calibrationValue :: String -> Int
+calibrationValue s = firstDigit * 10 + lastDigit
+ where
+  ds = digits' s
+  firstDigit = head ds
+  lastDigit = last ds
+
+solvePart1 :: Text -> Integer
+solvePart1 = fromIntegral . sum . fmap (calibrationValue . toString) . lines
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve input = pure $ Right [solvePart1 input]
diff --git a/src/AoC/Y2023/D02.hs b/src/AoC/Y2023/D02.hs
new file mode 100644
index 0000000..ee63e88
--- /dev/null
+++ b/src/AoC/Y2023/D02.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D02 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D03.hs b/src/AoC/Y2023/D03.hs
new file mode 100644
index 0000000..c509d93
--- /dev/null
+++ b/src/AoC/Y2023/D03.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D03 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D04.hs b/src/AoC/Y2023/D04.hs
new file mode 100644
index 0000000..d433091
--- /dev/null
+++ b/src/AoC/Y2023/D04.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D04 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D05.hs b/src/AoC/Y2023/D05.hs
new file mode 100644
index 0000000..2abeb79
--- /dev/null
+++ b/src/AoC/Y2023/D05.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D05 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D06.hs b/src/AoC/Y2023/D06.hs
new file mode 100644
index 0000000..4b9fd40
--- /dev/null
+++ b/src/AoC/Y2023/D06.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D06 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D07.hs b/src/AoC/Y2023/D07.hs
new file mode 100644
index 0000000..68a369e
--- /dev/null
+++ b/src/AoC/Y2023/D07.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D07 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D08.hs b/src/AoC/Y2023/D08.hs
new file mode 100644
index 0000000..024d550
--- /dev/null
+++ b/src/AoC/Y2023/D08.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D08 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D09.hs b/src/AoC/Y2023/D09.hs
new file mode 100644
index 0000000..c0111cf
--- /dev/null
+++ b/src/AoC/Y2023/D09.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D09 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D10.hs b/src/AoC/Y2023/D10.hs
new file mode 100644
index 0000000..dedcb34
--- /dev/null
+++ b/src/AoC/Y2023/D10.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D10 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D11.hs b/src/AoC/Y2023/D11.hs
new file mode 100644
index 0000000..979fee6
--- /dev/null
+++ b/src/AoC/Y2023/D11.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D11 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D12.hs b/src/AoC/Y2023/D12.hs
new file mode 100644
index 0000000..035fca3
--- /dev/null
+++ b/src/AoC/Y2023/D12.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D12 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D13.hs b/src/AoC/Y2023/D13.hs
new file mode 100644
index 0000000..a8678c6
--- /dev/null
+++ b/src/AoC/Y2023/D13.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D13 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D14.hs b/src/AoC/Y2023/D14.hs
new file mode 100644
index 0000000..7c591d3
--- /dev/null
+++ b/src/AoC/Y2023/D14.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D14 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D15.hs b/src/AoC/Y2023/D15.hs
new file mode 100644
index 0000000..43b5888
--- /dev/null
+++ b/src/AoC/Y2023/D15.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D15 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D16.hs b/src/AoC/Y2023/D16.hs
new file mode 100644
index 0000000..edcb507
--- /dev/null
+++ b/src/AoC/Y2023/D16.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D16 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D17.hs b/src/AoC/Y2023/D17.hs
new file mode 100644
index 0000000..ae873c6
--- /dev/null
+++ b/src/AoC/Y2023/D17.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D17 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D18.hs b/src/AoC/Y2023/D18.hs
new file mode 100644
index 0000000..f8d5908
--- /dev/null
+++ b/src/AoC/Y2023/D18.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D18 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D19.hs b/src/AoC/Y2023/D19.hs
new file mode 100644
index 0000000..54e3187
--- /dev/null
+++ b/src/AoC/Y2023/D19.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D19 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D20.hs b/src/AoC/Y2023/D20.hs
new file mode 100644
index 0000000..7fee6f1
--- /dev/null
+++ b/src/AoC/Y2023/D20.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D20 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D21.hs b/src/AoC/Y2023/D21.hs
new file mode 100644
index 0000000..cc073fb
--- /dev/null
+++ b/src/AoC/Y2023/D21.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D21 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D22.hs b/src/AoC/Y2023/D22.hs
new file mode 100644
index 0000000..2d59dae
--- /dev/null
+++ b/src/AoC/Y2023/D22.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D22 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D23.hs b/src/AoC/Y2023/D23.hs
new file mode 100644
index 0000000..953685b
--- /dev/null
+++ b/src/AoC/Y2023/D23.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D23 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D24.hs b/src/AoC/Y2023/D24.hs
new file mode 100644
index 0000000..27cab03
--- /dev/null
+++ b/src/AoC/Y2023/D24.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D24 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Y2023/D25.hs b/src/AoC/Y2023/D25.hs
new file mode 100644
index 0000000..cb0b109
--- /dev/null
+++ b/src/AoC/Y2023/D25.hs
@@ -0,0 +1,6 @@
+module AoC.Y2023.D25 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/src/AoC/Year.hs b/src/AoC/Year.hs
new file mode 100644
index 0000000..0576478
--- /dev/null
+++ b/src/AoC/Year.hs
@@ -0,0 +1,6 @@
+module AoC.Year (Year (..)) where
+
+data Year
+  = Y0000
+  | Y2023
+  deriving stock (Read, Show, Eq, Ord, Enum)
diff --git a/template/D00.hs b/template/D00.hs
new file mode 100644
index 0000000..be4d8fd
--- /dev/null
+++ b/template/D00.hs
@@ -0,0 +1,6 @@
+module AoC.Y0000.D00 (solve) where
+
+import AoC.Riddle
+
+solve :: (MonadIO m) => Text -> m (Either Text Solution)
+solve _ = pure $ Left "not yet implemented"
diff --git a/template/Y0000.hs b/template/Y0000.hs
new file mode 100644
index 0000000..60cfbff
--- /dev/null
+++ b/template/Y0000.hs
@@ -0,0 +1,57 @@
+module AoC.Y0000 (solve) where
+
+import AoC.Day
+import AoC.Riddle
+
+import AoC.Y0000.D01 qualified as D01
+import AoC.Y0000.D02 qualified as D02
+import AoC.Y0000.D03 qualified as D03
+import AoC.Y0000.D04 qualified as D04
+import AoC.Y0000.D05 qualified as D05
+import AoC.Y0000.D06 qualified as D06
+import AoC.Y0000.D07 qualified as D07
+import AoC.Y0000.D08 qualified as D08
+import AoC.Y0000.D09 qualified as D09
+import AoC.Y0000.D10 qualified as D10
+import AoC.Y0000.D11 qualified as D11
+import AoC.Y0000.D12 qualified as D12
+import AoC.Y0000.D13 qualified as D13
+import AoC.Y0000.D14 qualified as D14
+import AoC.Y0000.D15 qualified as D15
+import AoC.Y0000.D16 qualified as D16
+import AoC.Y0000.D17 qualified as D17
+import AoC.Y0000.D18 qualified as D18
+import AoC.Y0000.D19 qualified as D19
+import AoC.Y0000.D20 qualified as D20
+import AoC.Y0000.D21 qualified as D21
+import AoC.Y0000.D22 qualified as D22
+import AoC.Y0000.D23 qualified as D23
+import AoC.Y0000.D24 qualified as D24
+import AoC.Y0000.D25 qualified as D25
+
+solve :: (MonadIO m) => Day -> Text -> m (Either Error Solution)
+solve D01 = D01.solve
+solve D02 = D02.solve
+solve D03 = D03.solve
+solve D04 = D04.solve
+solve D05 = D05.solve
+solve D06 = D06.solve
+solve D07 = D07.solve
+solve D08 = D08.solve
+solve D09 = D09.solve
+solve D10 = D10.solve
+solve D11 = D11.solve
+solve D12 = D12.solve
+solve D13 = D13.solve
+solve D14 = D14.solve
+solve D15 = D15.solve
+solve D16 = D16.solve
+solve D17 = D17.solve
+solve D18 = D18.solve
+solve D19 = D19.solve
+solve D20 = D20.solve
+solve D21 = D21.solve
+solve D22 = D22.solve
+solve D23 = D23.solve
+solve D24 = D24.solve
+solve D25 = D25.solve
diff --git a/test/spec/AoCSpec/InternalSpec.hs b/test/spec/AoCSpec/UtilSpec.hs
similarity index 73%
rename from test/spec/AoCSpec/InternalSpec.hs
rename to test/spec/AoCSpec/UtilSpec.hs
index 345cfcb..a6d8739 100644
--- a/test/spec/AoCSpec/InternalSpec.hs
+++ b/test/spec/AoCSpec/UtilSpec.hs
@@ -1,6 +1,6 @@
-module AoCSpec.InternalSpec (spec) where
+module AoCSpec.UtilSpec (spec) where
 
-import AoC.Internal
+import AoC.Util
 
 import Test.Hspec
 
diff --git a/test/spec/AoCSpec/Y2023Spec.hs b/test/spec/AoCSpec/Y2023Spec.hs
new file mode 100644
index 0000000..f09e7a3
--- /dev/null
+++ b/test/spec/AoCSpec/Y2023Spec.hs
@@ -0,0 +1,10 @@
+module AoCSpec.Y2023Spec (spec) where
+
+import AoC
+import Test.Hspec
+
+spec :: Spec
+spec = do
+  describe "Day 1" do
+    it "calculates correctly" do
+      runAoC Y2023 D01 `shouldReturn` Right [54331]
diff --git a/test/spec/SpecHook.hs b/test/spec/SpecHook.hs
new file mode 100644
index 0000000..7335e6a
--- /dev/null
+++ b/test/spec/SpecHook.hs
@@ -0,0 +1,6 @@
+module SpecHook (hook) where
+
+import Test.Hspec
+
+hook :: Spec -> Spec
+hook = parallel