add first version

.github/workflows/workflow.yml

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+name: CI Pipeline
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  release:
+    types:
+      - published
+
+jobs:
+  ci:
+    uses: community-of-python/community-workflow/.github/workflows/preset.yml@main
+    with:
+      python-version: '["3.10","3.11","3.12","3.13","3.14"]'
+      os: '["ubuntu-latest"]'
+    secrets: inherit

.gitignore

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+# Generic things
+*.pyc
+*~
+__pycache__/*
+*.swp
+*.sqlite3
+*.map
+.vscode
+.idea
+.DS_Store
+.env
+.mypy_cache
+.pytest_cache
+.ruff_cache
+.coverage
+htmlcov/
+coverage.xml
+pytest.xml
+dist/
+.python-version
+.venv
+uv.lock
+/*.egg-info/
+.zed

Justfile

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+default: install lint test
+
+install:
+    uv lock --upgrade
+    uv sync --all-extras --frozen
+
+lint:
+    uv run ruff format
+    uv run ruff check --fix
+    uv run mypy .
+
+lint-ci:
+    uv run ruff format --check
+    uv run ruff check --no-fix
+    uv run mypy .
+
+test *args:
+    uv run --no-sync pytest {{ args }}
+
+publish:
+    rm -rf dist
+    uv version $GITHUB_REF_NAME
+    uv build
+    uv publish --token $PYPI_TOKEN

end_of_file_fixer/main.py

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+import argparse
+import os
+import pathlib
+import sys
+from typing import IO
+
+import pathspec
+
+
+def _fix_file(file_obj: IO[bytes]) -> int:
+    # Test for newline at end of file
+    # Empty files will throw IOError here
+    try:
+        file_obj.seek(-1, os.SEEK_END)
+    except OSError:
+        return 0
+
+    last_character = file_obj.read(1)
+    # last_character will be '' for an empty file
+    if last_character not in {b"\n", b"\r"} and last_character != b"":
+        # Needs this seek for windows, otherwise IOError
+        file_obj.seek(0, os.SEEK_END)
+        file_obj.write(b"\n")
+        return 1
+
+    while last_character in {b"\n", b"\r"}:
+        # Deal with the beginning of the file
+        if file_obj.tell() == 1:
+            # If we've reached the beginning of the file and it is all
+            # linebreaks then we can make this file empty
+            file_obj.seek(0)
+            file_obj.truncate()
+            return 1
+
+        # Go back two bytes and read a character
+        file_obj.seek(-2, os.SEEK_CUR)
+        last_character = file_obj.read(1)
+
+    # Our current position is at the end of the file just before any amount of
+    # newlines.  If we find extraneous newlines, then backtrack and trim them.
+    position = file_obj.tell()
+    remaining = file_obj.read()
+    for sequence in (b"\n", b"\r\n", b"\r"):
+        if remaining == sequence:
+            return 0
+        if remaining.startswith(sequence):
+            file_obj.seek(position + len(sequence))
+            file_obj.truncate()
+            return 1
+
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("path", help="path to directory", type=pathlib.Path)
+    args = parser.parse_args()
+
+    path: pathlib.Path = args.path
+    gitignore_path = path / ".gitignore"
+
+    ignore_patterns = [".git"]
+    if gitignore_path.exists():
+        with gitignore_path.open("r") as f:
+            ignore_patterns.extend(f.readlines())
+
+    gitignore_spec = pathspec.GitIgnoreSpec.from_lines(ignore_patterns)
+
+    retv = 0
+    for filename in gitignore_spec.match_tree(path, negate=True):
+        with pathlib.Path(filename).open("rb+") as f:
+            ret_for_file = _fix_file(f)
+            if ret_for_file:
+                sys.stdout.write(f"Fixing {filename}")
+            retv |= ret_for_file
+
+    return retv

pyproject.toml

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+[project]
+name = "end-of-file-fixer"
+description = "Implementations of the Circuit Breaker"
+readme = "README.md"
+requires-python = ">=3.10,<4"
+dependencies = [
+    "pathspec",
+]
+version = "0"
+authors = [{ name = "community-of-python" }]
+keywords = [
+    "python",
+]
+classifiers = [
+    "Typing :: Typed",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+]
+
+[project.urls]
+Repository = "https://github.com/community-of-python/end-of-file-fixer"
+Issues = "https://github.com/community-of-python/end-of-file-fixer/issues"
+Changelogs = "https://github.com/community-of-python/end-of-file-fixer/releases"
+
+[project.scripts]
+end-of-file-fixer = "end_of_file_fixer.main:main"
+
+[dependency-groups]
+dev = [
+    "ruff",
+    "mypy",
+    "pytest",
+    "pytest-cov",
+]
+
+[build-system]
+requires = ["uv_build"]
+build-backend = "uv_build"
+
+[tool.uv.build-backend]
+module-name = "end_of_file_fixer"
+module-root = ""
+
+[tool.mypy]
+python_version = "3.10"
+strict = true
+
+[tool.ruff]
+fix = true
+unsafe-fixes = true
+line-length = 120
+target-version = "py310"
+
+[tool.ruff.lint]
+select = ["ALL"]
+ignore = [
+    "D1",     # allow missing docstrings
+    "S101",   # allow asserts
+    "TCH",    # ignore flake8-type-checking
+    "FBT",    # allow boolean args
+    "D203",   # "one-blank-line-before-class" conflicting with D211
+    "D213",   # "multi-line-summary-second-line" conflicting with D212
+    "COM812", # flake8-commas "Trailing comma missing"
+    "ISC001", # flake8-implicit-str-concat
+]
+isort.lines-after-imports = 2
+isort.no-lines-before = ["standard-library", "local-folder"]
+
+[tool.pytest.ini_options]
+addopts = "--cov=. --cov-report term-missing"
+
+[tool.coverage]
+run.concurrency = ["thread"]
+report.exclude_also = ["if typing.TYPE_CHECKING:"]

tests/test_dummy.py

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+def test_dummy() -> None:
+    assert True