Add pre-commit to automatically run formatting when committing

.pre-commit-config.yaml

@@ -0,0 +1,28 @@
+# See https://pre-commit.com for more information
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+    - id: check-added-large-files
+      name: " 🐘 Check for added large files"
+    - id: check-toml
+      name: " ✔️  Check TOML"
+    - id: check-yaml
+      name: " ✔️  Check YAML"
+      args:
+      - --unsafe
+    - id: check-json
+      name: " ✔️  Check JSON"
+    - id: trailing-whitespace
+      name: " ✂️  Trim trailing whitespaces"
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: v0.0.277
+    hooks:
+      - id: ruff
+        name: " ⚡️ Formatting code with Ruff"
+        args:
+        - --fix
+
+ci:
+    autofix_commit_msg: 🎨 [pre-commit] Auto format
+    autoupdate_commit_msg: ⬆ [pre-commit] pre-commit auto update

CONTRIBUTING.md

@@ -33,6 +33,8 @@ git clone https://github.com/LibreTranslate/LibreTranslate.git
 cd LibreTranslate
 ```
 
+Hatch will automatically install the required dependencies in a virtual environment, and enable [`pre-commit`](https://pre-commit.com/), which will run before each commit to run formatting.
+
 Run in development:
 
 ```bash
@@ -72,6 +74,12 @@ You can also run the tests on multiple python versions:
 hatch run all:test
 ```
 
+You can clean the virtual environment with:
+
+```bash
+hatch env prune
+```
+
 ## Run with Docker
 
 Linux/macOS: `./run.sh [args]`

pyproject.toml

@@ -65,7 +65,7 @@ ltmanage = "libretranslate.manage:manage"
 test = [
     "pytest >=7.2.0",
     "pytest-cov",
-    "ruff ==0.0.277",
+    "pre-commit >=3.0.0",
     "types-requests",
 ]
 
@@ -83,13 +83,16 @@ History = "https://github.com/LibreTranslate/LibreTranslate/releases"
 features = [
     "test",
 ]
+post-install-commands = [
+    "pre-commit install",
+]
 
 
 [tool.hatch.envs.default.scripts]
 dev = "python main.py {args}"
 locales = "python scripts/compile_locales.py"
 fmt = [
-    "ruff libretranslate scripts --fix",
+    "pre-commit run --all --all-files",
 ]
 test = [
     "fmt",

wsgi.py

@@ -1,5 +1,6 @@
 from libretranslate import main
 
+
 def app(*args, **kwargs):
     import sys
     sys.argv = ['--wsgi']