diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..273404c
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,14 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/psf/black
+    rev: 23.1.0
+    hooks:
+      - id: black
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
diff --git a/pyproject.toml b/pyproject.toml
index 85543d8..535c215 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,9 @@ classifiers = [
 "Homepage" = "https://github.com/283375/arcaea-offline-ocr"
 "Bug Tracker" = "https://github.com/283375/arcaea-offline-ocr/issues"
 
+[tool.black]
+extend-exclude = 'src/arcaea_offline_ocr/_builtin_templates.py'
+
 [tool.isort]
 profile = "black"
 src_paths = ["src/arcaea_offline_ocr"]
diff --git a/src/arcaea_offline_ocr/__init__.py b/src/arcaea_offline_ocr/__init__.py
index e69de29..074dcb1 100644
--- a/src/arcaea_offline_ocr/__init__.py
+++ b/src/arcaea_offline_ocr/__init__.py
@@ -0,0 +1,6 @@
+from .crop import *
+from .device import *
+from .mask import *
+from .ocr import *
+from .recognize import *
+from .template import *
diff --git a/src/arcaea_offline_ocr/crop.py b/src/arcaea_offline_ocr/crop.py
index 0a3aedd..6ea48f5 100644
--- a/src/arcaea_offline_ocr/crop.py
+++ b/src/arcaea_offline_ocr/crop.py
@@ -4,6 +4,18 @@ from cv2 import Mat
 
 from .device import Device
 
+__all__ = [
+    "crop_img",
+    "crop_from_device_attr",
+    "crop_to_pure",
+    "crop_to_far",
+    "crop_to_lost",
+    "crop_to_max_recall",
+    "crop_to_rating_class",
+    "crop_to_score",
+    "crop_to_title",
+]
+
 
 def crop_img(img: Mat, *, top: int, left: int, bottom: int, right: int):
     return img[top:bottom, left:right]
diff --git a/src/arcaea_offline_ocr/device.py b/src/arcaea_offline_ocr/device.py
index 6af8f3f..d03b9f0 100644
--- a/src/arcaea_offline_ocr/device.py
+++ b/src/arcaea_offline_ocr/device.py
@@ -1,6 +1,8 @@
 from dataclasses import dataclass
 from typing import Any, Dict, Tuple
 
+__all__ = ["Device"]
+
 
 @dataclass(kw_only=True)
 class Device:
diff --git a/src/arcaea_offline_ocr/mask.py b/src/arcaea_offline_ocr/mask.py
index 2bf7be4..4008b73 100644
--- a/src/arcaea_offline_ocr/mask.py
+++ b/src/arcaea_offline_ocr/mask.py
@@ -1,6 +1,28 @@
 from cv2 import BORDER_CONSTANT, BORDER_ISOLATED, Mat, bitwise_or, dilate, inRange
 from numpy import array, uint8
 
+__all__ = [
+    "GRAY_MIN_HSV",
+    "GRAY_MAX_HSV",
+    "WHITE_MIN_HSV",
+    "WHITE_MAX_HSV",
+    "PST_MIN_HSV",
+    "PST_MAX_HSV",
+    "PRS_MIN_HSV",
+    "PRS_MAX_HSV",
+    "FTR_MIN_HSV",
+    "FTR_MAX_HSV",
+    "BYD_MIN_HSV",
+    "BYD_MAX_HSV",
+    "mask_gray",
+    "mask_white",
+    "mask_pst",
+    "mask_prs",
+    "mask_ftr",
+    "mask_byd",
+    "mask_rating_class",
+]
+
 GRAY_MIN_HSV = array([0, 0, 70], uint8)
 GRAY_MAX_HSV = array([0, 70, 200], uint8)
 
diff --git a/src/arcaea_offline_ocr/ocr.py b/src/arcaea_offline_ocr/ocr.py
index a705790..af78c46 100644
--- a/src/arcaea_offline_ocr/ocr.py
+++ b/src/arcaea_offline_ocr/ocr.py
@@ -11,6 +11,19 @@ from .template import (
     matchTemplateMultiple,
 )
 
+__all__ = [
+    "group_numbers",
+    "FilterDigitResultDict",
+    "filter_digit_results",
+    "ocr_digits",
+    "ocr_pure",
+    "ocr_far_lost",
+    "ocr_score",
+    "ocr_max_recall",
+    "ocr_rating_class",
+    "ocr_title",
+]
+
 
 def group_numbers(numbers: List[int], threshold: int) -> List[List[int]]:
     """
diff --git a/src/arcaea_offline_ocr/recognize.py b/src/arcaea_offline_ocr/recognize.py
index ef4d5b1..0caa66e 100644
--- a/src/arcaea_offline_ocr/recognize.py
+++ b/src/arcaea_offline_ocr/recognize.py
@@ -8,6 +8,19 @@ from .device import Device
 from .mask import *
 from .ocr import *
 
+__all__ = [
+    "process_digits_ocr_img",
+    "process_tesseract_ocr_img",
+    "recognize_pure",
+    "recognize_far_lost",
+    "recognize_score",
+    "recognize_max_recall",
+    "recognize_rating_class",
+    "recognize_title",
+    "RecognizeResult",
+    "recognize",
+]
+
 
 def process_digits_ocr_img(img_hsv_cropped: Mat, mask=Callable[[Mat], Mat]):
     img_hsv_cropped = mask(img_hsv_cropped)
diff --git a/src/arcaea_offline_ocr/template.py b/src/arcaea_offline_ocr/template.py
index 2d5c2b9..53f3bad 100644
--- a/src/arcaea_offline_ocr/template.py
+++ b/src/arcaea_offline_ocr/template.py
@@ -32,6 +32,13 @@ from numpy import uint8
 
 from ._builtin_templates import GeoSansLight_Italic, GeoSansLight_Regular
 
+__all__ = [
+    "load_digit_template",
+    "load_builtin_digit_template",
+    "MatchTemplateMultipleResult",
+    "matchTemplateMultiple",
+]
+
 
 def load_digit_template(filename: str) -> Dict[int, Mat]:
     """