Update pre-commit hooks

.pre-commit-config.yaml

@@ -2,14 +2,14 @@ exclude: ^tests/data/
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.1.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
       - id: check-yaml
 
   - repo: https://github.com/psf/black
-    rev: 21.12b0
+    rev: 22.1.0
     hooks:
       - id: black
 
@@ -28,13 +28,13 @@ repos:
       - id: isort
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.920
+    rev: v0.941
     hooks:
       - id: mypy
-        additional_dependencies: [click>=8.0.0, packaging>=21.0, types-dataclasses]
+        additional_dependencies: [click>=8.0.0, packaging>=21.0, types-dataclasses, rich>=10.13.0]
 
   - repo: https://github.com/executablebooks/mdformat
-    rev: 0.7.11
+    rev: 0.7.14
     hooks:
       - id: mdformat
         args: [--wrap=79]

CONTRIBUTING.md

@@ -44,11 +44,11 @@ channel on Python Discord. Here’s an
 [invite link](https://discord.gg/RtVdv86PrH)!
 
 [^1]: I'll fix this with a hash based solution eventually, but for now let's be
-careful.
+    careful.
 
-[^2]: I know it’s specifically for Black, but diff-shades is a development tool for
-Black so I consider it acceptable - although I never asked … but then again, I
-am a maintainer of Black so yeah :p
+[^2]: I know it’s specifically for Black, but diff-shades is a development tool
+    for Black so I consider it acceptable - although I never asked … but then
+    again, I am a maintainer of Black so yeah :p
 
 [nox]: https://nox.thea.codes/en/stable/
 [pre-commit]: https://pre-commit.com/

src/diff_shades/cli.py

@@ -187,7 +187,7 @@ def main(
         shutil.rmtree(diff_shades.results.CACHE_DIR)
     diff_shades.results.CACHE_DIR.mkdir(parents=True, exist_ok=True)
     if dump_html:
-        atexit.register(console.save_html, path=dump_html)
+        atexit.register(console.save_html, path=str(dump_html))
 
 
 # fmt: off

src/diff_shades/results.py

@@ -10,7 +10,6 @@
 import time
 from dataclasses import asdict, dataclass, field
 from datetime import datetime
-from functools import lru_cache
 from pathlib import Path
 from typing import (
     Any,
@@ -76,14 +75,18 @@ class ReformattedResult:
     line_changes: Tuple[int, int] = (-1, -1)
 
     def __post_init__(self) -> None:
+        self._diff_cache = ""
         _convert_line_count(self)
         if self.line_changes == (-1, -1):
             changes = calculate_line_changes(self.diff("throw-away-name"))
             object.__setattr__(self, "line_changes", changes)
 
-    @lru_cache(maxsize=None)
     def diff(self, filepath: str) -> str:
-        return unified_diff(self.src, self.dst, f"a/{filepath}", f"b/{filepath}")
+        if self._diff_cache:
+            return self._diff_cache
+
+        self._diff_cache = unified_diff(self.src, self.dst, f"a/{filepath}", f"b/{filepath}")
+        return self._diff_cache
 
 
 @dataclass(frozen=True)