🔧 Update linting rules and pre-commit config (py310 floor, drop setup-cfg-fmt, bump revs) (#564)

* 🔧 Update pre-commit config (py310, drop setup-cfg-fmt, bump revs)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* 🎨 Apply updated pre-commit hooks to codebase

Mechanical changes from the bumped hooks, mainly pyupgrade
--py310-plus (PEP 585/604 annotations), removal of now-unused
typing imports, and black 26 / isort 8 reformatting.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* 🎨 Apply pyupgrade to file missed in previous sweep

The previous local pre-commit runs spuriously skipped
tests/middleware_tests/test_latex_encoding.py, which made the
pre-commit CI job fail on the sweep commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: MiWeiss

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.5.0
+  rev: v6.0.0
   hooks:
   - id: trailing-whitespace
   - id: end-of-file-fixer
@@ -25,35 +25,31 @@ repos:
   - id: rst-directive-colons
   - id: rst-inline-touching-normal
 - repo: https://github.com/psf/black
-  rev: 24.2.0
+  rev: 26.5.1
   hooks:
   - id: black
     args: [--safe, --quiet, --line-length=100]
 - repo: https://github.com/PyCQA/autoflake
-  rev: v2.3.0
+  rev: v2.3.3
   hooks:
   - id: autoflake
     args: [--in-place, --remove-unused-variable]
 - repo: https://github.com/pycqa/isort
-  rev: 5.13.2
+  rev: 8.0.1
   hooks:
   - id: isort
     name: isort
     args: ["--force-single-line", "--line-length=100", "--profile=black"]
 - repo: https://github.com/asottile/pyupgrade
-  rev: v3.15.1
+  rev: v3.21.2
   hooks:
   - id: pyupgrade
-    args: [--py36-plus]
+    args: [--py310-plus]
 - repo: https://github.com/PyCQA/flake8
-  rev: 7.0.0
+  rev: 7.3.0
   hooks:
   - id: flake8
     args: ["--ignore=E722,W503,E203", --max-line-length=110, "--per-file-ignores=*/__init__.py:F401"]
-- repo: https://github.com/asottile/setup-cfg-fmt
-  rev: v2.5.0
-  hooks:
-  - id: setup-cfg-fmt
 - repo: https://github.com/HunterMcGushion/docstr_coverage
   rev: v2.3.2
   hooks:

bibtexparser/entrypoint.py

@@ -1,11 +1,8 @@
 import codecs
 import warnings
-from typing import Iterable
-from typing import List
+from collections.abc import Iterable
 from typing import Optional
 from typing import TextIO
-from typing import Tuple
-from typing import Union
 
 from .library import Library
 from .middlewares.middleware import Middleware
@@ -17,9 +14,9 @@
 
 
 def _build_parse_stack(
-    parse_stack: Optional[Iterable[Middleware]],
-    append_middleware: Optional[Iterable[Middleware]],
-) -> List[Middleware]:
+    parse_stack: Iterable[Middleware] | None,
+    append_middleware: Iterable[Middleware] | None,
+) -> list[Middleware]:
     if parse_stack is not None and append_middleware is not None:
         raise ValueError(
             "Provided both parse_stack and append_middleware. "
@@ -47,9 +44,9 @@ def _build_parse_stack(
 
 
 def _build_unparse_stack(
-    unparse_stack: Optional[Iterable[Middleware]],
-    prepend_middleware: Optional[Iterable[Middleware]],
-) -> List[Middleware]:
+    unparse_stack: Iterable[Middleware] | None,
+    prepend_middleware: Iterable[Middleware] | None,
+) -> list[Middleware]:
     if unparse_stack is not None and prepend_middleware is not None:
         raise ValueError(
             "Provided both unparse_stack and prepend_middleware. "
@@ -77,11 +74,11 @@ def _build_unparse_stack(
 
 
 def _handle_deprecated_write_params(
-    unparse_stack: Optional[Iterable[Middleware]],
-    prepend_middleware: Optional[Iterable[Middleware]],
+    unparse_stack: Iterable[Middleware] | None,
+    prepend_middleware: Iterable[Middleware] | None,
     kwargs: dict,
     function_name: str,
-) -> Tuple[Optional[Iterable[Middleware]], Optional[Iterable[Middleware]]]:
+) -> tuple[Iterable[Middleware] | None, Iterable[Middleware] | None]:
     """Handle deprecated parameter names for write functions.
 
     :param unparse_stack: Current unparse_stack value
@@ -124,9 +121,9 @@ def _handle_deprecated_write_params(
 
 def parse_string(
     bibtex_str: str,
-    parse_stack: Optional[Iterable[Middleware]] = None,
-    append_middleware: Optional[Iterable[Middleware]] = None,
-    library: Optional[Library] = None,
+    parse_stack: Iterable[Middleware] | None = None,
+    append_middleware: Iterable[Middleware] | None = None,
+    library: Library | None = None,
 ) -> Library:
     """Parse a BibTeX string.
 
@@ -156,8 +153,8 @@ def parse_string(
 
 def parse_file(
     path: str,
-    parse_stack: Optional[Iterable[Middleware]] = None,
-    append_middleware: Optional[Iterable[Middleware]] = None,
+    parse_stack: Iterable[Middleware] | None = None,
+    append_middleware: Iterable[Middleware] | None = None,
     encoding: str = "UTF-8",
 ) -> Library:
     """Parse a BibTeX file
@@ -188,11 +185,11 @@ def parse_file(
 
 
 def write_file(
-    file: Union[str, TextIO],
+    file: str | TextIO,
     library: Library,
-    unparse_stack: Optional[Iterable[Middleware]] = None,
-    prepend_middleware: Optional[Iterable[Middleware]] = None,
-    bibtex_format: Optional[BibtexFormat] = None,
+    unparse_stack: Iterable[Middleware] | None = None,
+    prepend_middleware: Iterable[Middleware] | None = None,
+    bibtex_format: BibtexFormat | None = None,
     encoding: str = "UTF-8",
     **kwargs,
 ) -> None:
@@ -230,8 +227,8 @@ def write_file(
 
 def write_string(
     library: Library,
-    unparse_stack: Optional[Iterable[Middleware]] = None,
-    prepend_middleware: Optional[Iterable[Middleware]] = None,
+    unparse_stack: Iterable[Middleware] | None = None,
+    prepend_middleware: Iterable[Middleware] | None = None,
     bibtex_format: Optional["BibtexFormat"] = None,
     **kwargs,
 ) -> str:

bibtexparser/exceptions.py

@@ -1,7 +1,3 @@
-from typing import List
-from typing import Optional
-
-
 class ParsingException(Exception):
     """Generic Exception for parsing errors"""
 
@@ -25,7 +21,7 @@ def __init__(
         self,
         abort_reason: str,
         # Not provided if end of file is reached
-        end_index: Optional[int] = None,
+        end_index: int | None = None,
     ):
         self.abort_reason = abort_reason
         self.end_index = end_index
@@ -60,6 +56,6 @@ def __init__(self, first_match, expected_match, second_match):
 class PartialMiddlewareException(ParsingException):
     """Exception raised when a middleware could not be fully applied."""
 
-    def __init__(self, reasons: List[str]):
+    def __init__(self, reasons: list[str]):
         reasons_string = "\n\n=====\n\n".join(reasons)
         super().__init__(f"Middleware could not be fully applied: {reasons_string}")

bibtexparser/library.py

@@ -1,7 +1,3 @@
-from typing import Dict
-from typing import List
-from typing import Union
-
 from .model import Block
 from .model import DuplicateBlockKeyBlock
 from .model import Entry
@@ -19,7 +15,7 @@ class Library:
 
     def __init__(
         self,
-        blocks: Union[List[Block], None] = None,
+        blocks: list[Block] | None = None,
         fail_on_duplicate_key: bool = True,
     ):
         self._blocks = []
@@ -28,7 +24,7 @@ def __init__(
         if blocks is not None:
             self.add(blocks, fail_on_duplicate_key=fail_on_duplicate_key)
 
-    def add(self, blocks: Union[List[Block], Block], fail_on_duplicate_key: bool = True):
+    def add(self, blocks: list[Block] | Block, fail_on_duplicate_key: bool = True):
         """Add blocks to library.
 
         The adding is key-safe, i.e., it is made sure that no duplicate keys are added
@@ -64,7 +60,7 @@ def add(self, blocks: Union[List[Block], Block], fail_on_duplicate_key: bool = T
             block = self._add_to_dicts(block)
             self._blocks.append(block)
 
-    def _find_duplicate_keys(self, blocks: List[Block]) -> List[str]:
+    def _find_duplicate_keys(self, blocks: list[Block]) -> list[str]:
         """Keys of blocks that would become duplicates when added to the library."""
         duplicate_keys = []
         seen_entry_keys = set(self._entries_by_key)
@@ -91,7 +87,7 @@ def _block_index(self, block: Block) -> int:
         # No identity match; fall back to equality (raises ValueError if not found).
         return self._blocks.index(block)
 
-    def remove(self, blocks: Union[List[Block], Block]):
+    def remove(self, blocks: list[Block] | Block):
         """Remove blocks from library.
 
         If equal duplicate blocks exist in the library, the exact (identical)
@@ -143,9 +139,7 @@ def replace(self, old_block: Block, new_block: Block, fail_on_duplicate_key: boo
             raise ValueError("Duplicate key found.")
 
     @staticmethod
-    def _cast_to_duplicate(
-        prev_block_with_same_key: Union[Entry, String], duplicate: Union[Entry, String]
-    ):
+    def _cast_to_duplicate(prev_block_with_same_key: Entry | String, duplicate: Entry | String):
         if not (
             isinstance(prev_block_with_same_key, type(duplicate))
             or isinstance(duplicate, type(prev_block_with_same_key))
@@ -196,44 +190,44 @@ def _add_to_dicts(self, block):
         return block
 
     @property
-    def blocks(self) -> List[Block]:
+    def blocks(self) -> list[Block]:
         """All blocks in the library, preserving order of insertion."""
         return self._blocks
 
     @property
-    def failed_blocks(self) -> List[ParsingFailedBlock]:
+    def failed_blocks(self) -> list[ParsingFailedBlock]:
         """All blocks that could not be parsed, preserving order of insertion."""
         return [b for b in self._blocks if isinstance(b, ParsingFailedBlock)]
 
     @property
-    def strings(self) -> List[String]:
+    def strings(self) -> list[String]:
         """All @string blocks in the library, preserving order of insertion."""
         return list(self._strings_by_key.values())
 
     @property
-    def strings_dict(self) -> Dict[str, String]:
+    def strings_dict(self) -> dict[str, String]:
         """Dict representation of all @string blocks in the library."""
         return self._strings_by_key.copy()
 
     @property
-    def entries(self) -> List[Entry]:
+    def entries(self) -> list[Entry]:
         """All entry (@article, ...) blocks in the library, preserving order of insertion."""
         # Note: Taking this from the entries dict would be faster, but does not preserve order
         #   e.g. in cases where `replace` has been called.
         return [b for b in self._blocks if isinstance(b, Entry)]
 
     @property
-    def entries_dict(self) -> Dict[str, Entry]:
+    def entries_dict(self) -> dict[str, Entry]:
         """Dict representation of all entry blocks in the library."""
         return self._entries_by_key.copy()
 
     @property
-    def preambles(self) -> List[Preamble]:
+    def preambles(self) -> list[Preamble]:
         """All @preamble blocks in the library, preserving order of insertion."""
         return [block for block in self._blocks if isinstance(block, Preamble)]
 
     @property
-    def comments(self) -> List[Union[ExplicitComment, ImplicitComment]]:
+    def comments(self) -> list[ExplicitComment | ImplicitComment]:
         """All comment blocks in the library, preserving order of insertion."""
         return [
             block for block in self._blocks if isinstance(block, (ExplicitComment, ImplicitComment))

bibtexparser/middlewares/enclosing.py

@@ -1,7 +1,3 @@
-from typing import Optional
-from typing import Tuple
-from typing import Union
-
 from bibtexparser.library import Library
 from bibtexparser.model import Entry
 from bibtexparser.model import Field
@@ -53,7 +49,7 @@ def metadata_key(cls) -> str:
         return REMOVED_ENCLOSING_KEY
 
     @staticmethod
-    def _strip_enclosing(value: str) -> Tuple[str, Union[str, None]]:
+    def _strip_enclosing(value: str) -> tuple[str, str | None]:
         value = value.strip()
         if value.startswith("{") and value.endswith("}"):
             return value[1:-1], "{"
@@ -144,9 +140,9 @@ def metadata_key(cls) -> str:
     def _enclose(
         self,
         value: str,
-        metadata_enclosing: Optional[str],
+        metadata_enclosing: str | None,
         apply_int_rule: bool,
-        demanded_enclosing: Optional[str] = None,
+        demanded_enclosing: str | None = None,
     ) -> str:
         enclosing = self._default_enclosing
         if demanded_enclosing is not None:

bibtexparser/middlewares/fieldkeys.py

@@ -1,7 +1,4 @@
 import logging
-from typing import Dict
-from typing import List
-from typing import Set
 
 from bibtexparser.library import Library
 from bibtexparser.model import Entry
@@ -29,8 +26,8 @@ def __init__(self, allow_inplace_modification: bool = True):
 
     # docstr-coverage: inherited
     def transform_entry(self, entry: Entry, library: "Library") -> Entry:
-        seen_normalized_keys: Set[str] = set()
-        new_fields_dict: Dict[str, Field] = {}
+        seen_normalized_keys: set[str] = set()
+        new_fields_dict: dict[str, Field] = {}
         for field in entry.fields:
             normalized_key: str = field.key.lower()
             # if the normalized key is already present, apply "last one wins"
@@ -48,7 +45,7 @@ def transform_entry(self, entry: Entry, library: "Library") -> Entry:
             field.key = normalized_key
             new_fields_dict[normalized_key] = field
 
-        new_fields: List[Field] = list(new_fields_dict.values())
+        new_fields: list[Field] = list(new_fields_dict.values())
         entry.fields = new_fields
 
         return entry