test: Add a benchmark

.github/workflows/build.yaml

@@ -29,3 +29,5 @@ jobs:
       run: nix build .#gibberish:test:test
     - name: Run static checks
       run: nix build .#fourmoluCheck .#hlintCheck
+    - name: Run benchmarks
+      run: nix build .#gibberish:bench:main

.gitignore

@@ -29,4 +29,5 @@ result
 .direnv
 
 ### Tests
-data/tests/gen/*.out.json
+data/tests/gen/*.out.json
+output.json

bench/Main.hs

@@ -0,0 +1,31 @@
+module Main (main) where
+
+import Data.Gibberish.GenTrigrams (mapTrigrams)
+import Data.Gibberish.Types (Digram (), Frequencies ())
+import Paths_gibberish (getDataDir)
+
+import Criterion.Main
+import Data.Aeson (encode)
+import Data.Char (isAlpha)
+import Data.Map (Map ())
+import Data.Text (Text ())
+import Data.Text qualified as Text
+import Data.Text.IO qualified as Text
+import System.FilePath ((</>))
+
+dictionary :: IO [Text]
+dictionary = map Text.toLower . filter (Text.all isAlpha) . Text.lines <$> contents
+  where
+    contents = Text.readFile =<< dataDir
+    dataDir = (</> "data" </> "dicts" </> "wamerican.txt") <$> getDataDir
+
+trigrams :: IO (Map Digram Frequencies)
+trigrams = mapTrigrams <$> dictionary
+
+main :: IO ()
+main =
+  defaultMain
+    [ bench "load dictionary file" $ nfIO dictionary,
+      env dictionary $ bench "generate trigrams" . nf mapTrigrams,
+      env trigrams $ bench "serialize to JSON" . nf encode
+    ]

cabal.project

@@ -3,4 +3,4 @@ packages: ./*.cabal
 index-state: 2023-07-18T15:00:46Z
 
 tests: True
-test-show-details: direct
+test-show-details: direct