feat: lint-file subcommand

.pre-commit-hooks.yaml

@@ -3,10 +3,18 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 - id: reuse
-  name: reuse
+  name: reuse lint
   entry: reuse
   args: ["lint"]
   language: python
   pass_filenames: false
   description:
-    "Lint the project directory for compliance with the REUSE Specification"
+    "Lint the project directory for compliance with the REUSE Specification."
+
+- id: reuse-lint-file
+  name: reuse lint-file
+  entry: reuse
+  args: ["lint-file"]
+  language: python
+  description:
+    "Lint the changed files for compliance with the REUSE Specification."

.pylintrc

@@ -11,7 +11,8 @@ jobs=0
 
 disable=duplicate-code,
          logging-fstring-interpolation,
-         implicit-str-concat
+         implicit-str-concat,
+         inconsistent-quotes
 enable=useless-suppression
 
 [REPORTS]

AUTHORS.rst

@@ -120,6 +120,7 @@ Contributors
 - Jon Burdo <[email protected]>
 - Josef Andersson <[email protected]>
 - José Vieira <[email protected]>
+- Kerry McAdams <github@klmcadams>
 - Kevin Meagher <[email protected]>
 - Lars Francke <[email protected]>
 - Libor Pechacek <[email protected]>
@@ -139,6 +140,7 @@ Contributors
 - Romain Tartière <[email protected]>
 - Ryan Schmidt <[email protected]>
 - Sebastian Crane <[email protected]>
+- Sebastien Morais <github@SMoraisAnsys>
 - T. E. Kalaycı <[email protected]>
 - Vishesh Handa <[email protected]>
 - Vlad-Stefan Harbuz <[email protected]>

README.md

@@ -247,7 +247,7 @@ Git. This uses [pre-commit](https://pre-commit.com/). Once you
 ```yaml
 repos:
   - repo: https://github.com/fsfe/reuse-tool
-    rev: v3.0.2
+    rev: v4.0.3
     hooks:
       - id: reuse
 ```
@@ -256,6 +256,17 @@ Then run `pre-commit install`. Now, every time you commit, `reuse lint` is run
 in the background, and will prevent your commit from going through if there was
 an error.
 
+If you instead want to only lint files that were changed in your commit, you can
+use the following configuration:
+
+```yaml
+repos:
+  - repo: https://github.com/fsfe/reuse-tool
+    rev: v4.0.3
+    hooks:
+      - id: reuse-lint-file
+```
+
 ## Maintainers
 
 - Carmen Bianca Bakker <[email protected]>

changelog.d/added/lint-file.md

@@ -0,0 +1 @@
+- Add lint-file subcommand to enable running lint on specific files.

docs/conf.py

@@ -31,7 +31,7 @@
     # The full version, including alpha/beta/rc tags.
     release = get_version("reuse")
 except PackageNotFoundError:
-    release = "3.0.2"
+    release = "4.0.3"
 
 # The short X.Y.Z version.
 version = ".".join(release.split(".")[:3])
@@ -115,6 +115,14 @@
         "Free Software Foundation Europe",
         1,
     ),
+    (
+        "man/reuse-lint-file",
+        "reuse-lint-file",
+        "Verify whether the specified files are compliant with the REUSE"
+        " Specification",
+        "Free Software Foundation Europe",
+        1,
+    ),
     (
         "man/reuse-spdx",
         "reuse-spdx",
@@ -130,6 +138,11 @@
         1,
     ),
 ]
+manpages_url = (
+    "https://reuse.readthedocs.io/en/v{version}/man/{page}.html".format(
+        version=version, page="{page}"
+    )
+)
 
 # -- Custom ------------------------------------------------------------------
 

docs/man/reuse-lint-file.rst

@@ -0,0 +1,50 @@
+..
+  SPDX-FileCopyrightText: 2019 Free Software Foundation Europe e.V. <https://fsfe.org>
+  SPDX-FileCopyrightText: © 2020 Liferay, Inc. <https://liferay.com>
+
+  SPDX-License-Identifier: CC-BY-SA-4.0
+
+reuse-lint-file
+===============
+
+Synopsis
+--------
+
+**reuse lint-file** [*options*] [*file* ...]
+
+Description
+-----------
+
+:program:`reuse-lint-file` verifies whether the specified files are compliant
+with the REUSE Specification located at `<https://reuse.software/spec>`_. It
+runs the linter from :manpage:`reuse-lint(1)` against a subset of files, using a
+subset of criteria.
+
+Files that are ignored by :program:`reuse-lint` are also ignored by
+:program:`reuse-lint-file`, even if specified.
+
+Criteria
+--------
+
+The criteria are the same as used in :manpage:`reuse-lint(1)`, but using only a
+subset:
+
+- Missing licenses.
+- Read errors.
+- Files without copyright and license information.
+
+Options
+-------
+
+.. option:: -q, --quiet
+
+  Do not print anything to STDOUT.
+
+.. option:: -l, --lines
+
+  Output one line per error, prefixed by the file path. This option is the
+  default.
+
+.. option:: -h, --help
+
+  Display help and exit.

docs/man/reuse-lint.rst

@@ -90,7 +90,7 @@ Options
 .. option:: -p, --plain
 
   Output the results of the lint as descriptive text. The text is valid
-  Markdown.
+  Markdown. This option is the default.
 
 .. option:: -l, --lines
 

pyproject.toml

@@ -122,6 +122,12 @@ push = false
 "src/reuse/__init__.py" = [
     '__version__ = "{pep440_version}"$',
 ]
+"docs/conf.py" = [
+    'release = "{pep440_version}"$',
+]
+"README.md" = [
+    'rev: {version}$',
+]
 
 [tool.protokolo]
 changelog = "CHANGELOG.md"

src/reuse/_lint_file.py

@@ -0,0 +1,63 @@
+# SPDX-FileCopyrightText: 2024 Kerry McAdams <github@klmcadams>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Linting specific files happens here. The linting here is nothing more than 
+reading the reports and printing some conclusions.
+"""
+
+import sys
+from argparse import ArgumentParser, Namespace
+from gettext import gettext as _
+from pathlib import Path
+from typing import IO
+
+from ._util import PathType, is_relative_to
+from .lint import format_lines_subset
+from .project import Project
+from .report import ProjectSubsetReport
+
+
+def add_arguments(parser: ArgumentParser) -> None:
+    """Add arguments to parser."""
+    mutex_group = parser.add_mutually_exclusive_group()
+    mutex_group.add_argument(
+        "-q", "--quiet", action="store_true", help=_("prevents output")
+    )
+    mutex_group.add_argument(
+        "-l",
+        "--lines",
+        action="store_true",
+        help=_("formats output as errors per line (default)"),
+    )
+    parser.add_argument(
+        "files",
+        action="store",
+        nargs="*",
+        type=PathType("r"),
+        help=_("files to lint"),
+    )
+
+
+def run(args: Namespace, project: Project, out: IO[str] = sys.stdout) -> int:
+    """List all non-compliant files from specified file list."""
+    subset_files = {Path(file_) for file_ in args.files}
+    for file_ in subset_files:
+        if not is_relative_to(file_.resolve(), project.root.resolve()):
+            args.parser.error(
+                _("'{file}' is not inside of '{root}'").format(
+                    file=file_, root=project.root
+                )
+            )
+    report = ProjectSubsetReport.generate(
+        project,
+        subset_files,
+        multiprocessing=not args.no_multiprocessing,
+    )
+
+    if args.quiet:
+        pass
+    else:
+        out.write(format_lines_subset(report))
+
+    return 0 if report.is_compliant else 1

src/reuse/_main.py

@@ -2,6 +2,7 @@
 # SPDX-FileCopyrightText: 2022 Florian Snow <[email protected]>
 # SPDX-FileCopyrightText: 2024 Carmen Bianca BAKKER <[email protected]>
 # SPDX-FileCopyrightText: © 2020 Liferay, Inc. <https://liferay.com>
+# SPDX-FileCopyrightText: 2024 Kerry McAdams <github@klmcadams>
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -20,6 +21,7 @@
     __REUSE_version__,
     __version__,
     _annotate,
+    _lint_file,
     convert_dep5,
     download,
     lint,
@@ -173,6 +175,14 @@ def parser() -> argparse.ArgumentParser:
         ),
     )
 
+    add_command(
+        subparsers,
+        "lint-file",
+        _lint_file.add_arguments,
+        _lint_file.run,
+        help=_("list non-compliant files from specified list of files"),
+    )
+
     add_command(
         subparsers,
         "spdx",

src/reuse/_util.py

@@ -14,7 +14,7 @@
 
 """Misc. utilities for reuse."""
 
-
+import contextlib
 import logging
 import os
 import re
@@ -29,7 +29,7 @@
 from inspect import cleandoc
 from itertools import chain
 from os import PathLike
-from pathlib import Path
+from pathlib import Path, PurePath
 from typing import (
     IO,
     Any,
@@ -665,4 +665,13 @@ def cleandoc_nl(text: str) -> str:
     return cleandoc(text) + "\n"
 
 
+def is_relative_to(path: PurePath, target: PurePath) -> bool:
+    """Like Path.is_relative_to, but working for Python <3.9."""
+    # TODO: When Python 3.8 is dropped, remove this function.
+    with contextlib.suppress(ValueError):
+        path.relative_to(target)
+        return True
+    return False
+
+
 # REUSE-IgnoreEnd

src/reuse/global_licensing.py

@@ -6,7 +6,6 @@
 
 # mypy: disable-error-code=attr-defined
 
-import contextlib
 import logging
 import re
 from abc import ABC, abstractmethod
@@ -40,7 +39,7 @@
 from license_expression import ExpressionError
 
 from . import ReuseInfo, SourceType
-from ._util import _LICENSING, StrPath
+from ._util import _LICENSING, StrPath, is_relative_to
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -555,9 +554,7 @@ def _find_relevant_tomls(self, path: StrPath) -> List[ReuseTOML]:
         found = []
         for toml in self.reuse_tomls:
             # TODO: When Python 3.8 is dropped, use is_relative_to instead.
-            with contextlib.suppress(ValueError):
-                PurePath(path).relative_to(toml.directory)
-                # No error.
+            if is_relative_to(PurePath(path), toml.directory):
                 found.append(toml)
         # Sort from topmost to deepest directory.
         found.sort(key=lambda toml: toml.directory.parts)