From 32a903bf5efee8b07837d8cd556d2c47acf48130 Mon Sep 17 00:00:00 2001
From: Anton Kesy <antonkesy@gmail.com>
Date: Mon, 4 Mar 2024 12:36:37 +0100
Subject: [PATCH] add ormolu formatter

---
 .pre-commit-config.yaml | 16 ++++++++++++++++
 Dockerfile              | 10 +++++++++-
 Setup.hs                |  1 +
 src/Lib.hs              |  5 +++--
 4 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100644 .pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..41f107a
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,16 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: local
+    hooks:
+      - id: ormolu-formatter
+        name: ormolu-formatter
+        entry: bash -c "stack install ormolu && ormolu --mode inplace $(find . -name '*.hs')"
+        language: system
+        types: [haskell]
+        pass_filenames: false
+        always_run: true
diff --git a/Dockerfile b/Dockerfile
index 06f30f8..99cb5b3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,9 +10,17 @@ RUN curl -sSL https://get.haskellstack.org/ | sh
 ENV PATH="/root/.local/bin:${PATH}"
 RUN stack --resolver ghc-9.6.4 setup
 
+RUN stack install omolu
+
 WORKDIR /peter-lang
 
 COPY . /peter-lang
 
-RUN stack build 
+# cancel the build if there are formatting errors
+RUN ormolu --mode check $(find . -name '*.hs')
+# build project
+RUN stack build
 RUN stack test
+# pre-commit
+RUN git init . && pre-commit install-hooks
+RUN pre-commit run --all-files
diff --git a/Setup.hs b/Setup.hs
index 9a994af..e8ef27d 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,2 +1,3 @@
 import Distribution.Simple
+
 main = defaultMain
diff --git a/src/Lib.hs b/src/Lib.hs
index d36ff27..3424510 100644
--- a/src/Lib.hs
+++ b/src/Lib.hs
@@ -1,6 +1,7 @@
 module Lib
-    ( someFunc
-    ) where
+  ( someFunc,
+  )
+where
 
 someFunc :: IO ()
 someFunc = putStrLn "someFunc"