Adding --json to lint

CHANGELOG.md

@@ -61,6 +61,7 @@ CLI command and its behaviour. There are no guarantees of stability for the
   SPDX license expression remains the same:
   `Apache-2.0 AND CC0-1.0 AND CC-BY-SA-4.0 AND GPL-3.0-or-later`. (#733)
 - Added `--contributor` option to `annotate`. (#669)
+- Added `--json` flag to `lint` command (#654).
 
 ### Changed
 

src/reuse/__init__.py

@@ -20,7 +20,7 @@
 import os
 import re
 from dataclasses import dataclass, field
-from typing import NamedTuple, Set
+from typing import NamedTuple, Optional, Set
 
 try:
     from importlib.metadata import PackageNotFoundError, version
@@ -95,6 +95,11 @@ class SpdxInfo:
     spdx_expressions: Set[Expression] = field(default_factory=set)
     copyright_lines: Set[str] = field(default_factory=set)
     contributor_lines: Set[str] = field(default_factory=set)
+    license_path: Optional[str] = None
+
+    def contains_copyright_or_licensing(self) -> bool:
+        """Either *spdx_expressions* or *copyright_lines* is non-empty."""
+        return bool(self.spdx_expressions or self.copyright_lines)
 
     def __bool__(self):
         return any(self.__dict__.values())

src/reuse/_util.py

@@ -208,11 +208,12 @@ def _copyright_from_dep5(path: PathLike, dep5_copyright: Copyright) -> SpdxInfo:
     result = dep5_copyright.find_files_paragraph(Path(path).as_posix())
 
     if result is None:
-        return SpdxInfo(set(), set())
+        return SpdxInfo(set(), set(), license_path=str(path))
 
     return SpdxInfo(
         set(map(_LICENSING.parse, [result.license.synopsis])),
         set(map(str.strip, result.copyright.splitlines())),
+        license_path=str(path),
     )
 
 
@@ -316,7 +317,7 @@ def extract_spdx_info(text: str) -> SpdxInfo:
                 copyright_matches.add(match.groupdict()["copyright"].strip())
                 break
 
-    return SpdxInfo(expressions, copyright_matches)
+    return SpdxInfo(expressions, copyright_matches, "")
 
 
 def find_license_identifiers(text: str) -> Iterator[str]:

src/reuse/header.py

@@ -178,6 +178,7 @@ def create_header(
             spdx_info.spdx_expressions.union(existing_spdx.spdx_expressions),
             spdx_copyrights,
             spdx_info.contributor_lines.union(existing_spdx.contributor_lines),
+            "",
         )
 
     new_header += _create_new_header(
@@ -784,7 +785,7 @@ def run(args, project: Project, out=sys.stdout) -> int:
         set(args.contributor) if args.contributor is not None else set()
     )
 
-    spdx_info = SpdxInfo(expressions, copyright_lines, contributors)
+    spdx_info = SpdxInfo(expressions, copyright_lines, contributors, "")
 
     result = 0
     for path in paths: