Better output on wrong argument given to Ruff

prospector/blender.py

@@ -85,11 +85,10 @@ def blend(messages: list[Message], blend_combos: Optional[list[list[tuple[str, s
     blend_combos = blend_combos or BLEND_COMBOS
 
     # group messages by file and then line number
-    msgs_grouped: dict[Path, dict[int, list[Message]]] = defaultdict(lambda: defaultdict(list))
+    msgs_grouped: dict[Optional[Path], dict[Optional[int], list[Message]]] = defaultdict(lambda: defaultdict(list))
 
     for message in messages:
-        line = message.location.line
-        msgs_grouped[message.location.path][-1 if line is None else line].append(
+        msgs_grouped[message.location.path][message.location.line].append(
             message,
         )
 

prospector/formatters/base.py

@@ -28,7 +28,8 @@ def render(self, summary: bool = True, messages: bool = True, profile: bool = Fa
         raise NotImplementedError
 
     def _make_path(self, location: Location) -> Path:
-        return location.relative_path(self.paths_relative_to)
+        path_ = location.relative_path(self.paths_relative_to)
+        return Path() if path_ is None else path_
 
     def _message_to_dict(self, message: Message) -> dict[str, Any]:
         loc = {

prospector/formatters/grouped.py

@@ -1,5 +1,6 @@
 from collections import defaultdict
 from pathlib import Path
+from typing import Optional
 
 from prospector.formatters.text import TextFormatter
 from prospector.message import Message
@@ -15,10 +16,9 @@ def render_messages(self) -> str:
             "",
         ]
 
-        groups: dict[Path, dict[int, list[Message]]] = defaultdict(lambda: defaultdict(list))
+        groups: dict[Path, dict[Optional[int], list[Message]]] = defaultdict(lambda: defaultdict(list))
 
         for message in self.messages:
-            assert message.location.line is not None
             groups[self._make_path(message.location)][message.location.line].append(message)
 
         for filename in sorted(groups.keys()):

prospector/formatters/pylint.py

@@ -28,16 +28,26 @@ def render_messages(self) -> list[str]:
             # Missing function docstring
 
             template_location = (
-                "%(path)s"
+                ""
+                if message.location.path is None
+                else "%(path)s"
                 if message.location.line is None
                 else "%(path)s:%(line)s"
                 if message.location.character is None
                 else "%(path)s:%(line)s:%(character)s"
             )
             template_code = (
-                "%(code)s(%(source)s)" if message.location.function is None else "[%(code)s(%(source)s), %(function)s]"
+                "(%(source)s)"
+                if message.code is None
+                else "%(code)s(%(source)s)"
+                if message.location.function is None
+                else "[%(code)s(%(source)s), %(function)s]"
+            )
+            template = (
+                f"{template_location}: {template_code}: %(message)s"
+                if template_location
+                else f"{template_code}: %(message)s"
             )
-            template = f"{template_location}: {template_code}: %(message)s"
 
             output.append(
                 template

prospector/message.py

@@ -3,9 +3,11 @@
 
 
 class Location:
+    _path: Optional[Path]
+
     def __init__(
         self,
-        path: Union[Path, str],
+        path: Optional[Union[Path, str]],
         module: Optional[str],
         function: Optional[str],
         line: Optional[int],
@@ -15,6 +17,8 @@ def __init__(
             self._path = path.absolute()
         elif isinstance(path, str):
             self._path = Path(path).absolute()
+        elif path is None:
+            self._path = None
         else:
             raise ValueError
         self.module = module or None
@@ -23,13 +27,15 @@ def __init__(
         self.character = None if character == -1 else character
 
     @property
-    def path(self) -> Path:
+    def path(self) -> Optional[Path]:
         return self._path
 
-    def absolute_path(self) -> Path:
+    def absolute_path(self) -> Optional[Path]:
         return self._path
 
-    def relative_path(self, root: Optional[Path]) -> Path:
+    def relative_path(self, root: Optional[Path]) -> Optional[Path]:
+        if self._path is None:
+            return None
         return self._path.relative_to(root) if root else self._path
 
     def __repr__(self) -> str:
@@ -46,6 +52,13 @@ def __eq__(self, other: object) -> bool:
     def __lt__(self, other: "Location") -> bool:
         if not isinstance(other, Location):
             raise ValueError
+
+        if self._path is None and other._path is None:
+            return False
+        if self._path is None:
+            return True
+        if other._path is None:
+            return False
         if self._path == other._path:
             if self.line == other.line:
                 return (self.character or -1) < (other.character or -1)

prospector/postfilter.py

@@ -29,7 +29,7 @@ def filter_messages(filepaths: List[Path], messages: List[Message]) -> List[Mess
     filtered = []
     for message in messages:
         # first get rid of the pylint informational messages
-        relative_message_path = Path(message.location.path)
+        relative_message_path = None if message.location.path is None else Path(message.location.path)
 
         if message.source == "pylint" and message.code in (
             "suppressed-message",

prospector/suppression.py

@@ -24,6 +24,7 @@
 import warnings
 from collections import defaultdict
 from pathlib import Path
+from typing import Optional
 
 from prospector import encoding
 from prospector.exceptions import FatalProspectorException
@@ -63,9 +64,11 @@ def get_noqa_suppressions(file_contents: list[str]) -> tuple[bool, set[int]]:
 }
 
 
-def _parse_pylint_informational(messages: list[Message]) -> tuple[set[Path], dict[Path, dict[int, list[str]]]]:
-    ignore_files: set[Path] = set()
-    ignore_messages: dict[Path, dict[int, list[str]]] = defaultdict(lambda: defaultdict(list))
+def _parse_pylint_informational(
+    messages: list[Message],
+) -> tuple[set[Optional[Path]], dict[Optional[Path], dict[int, list[str]]]]:
+    ignore_files: set[Optional[Path]] = set()
+    ignore_messages: dict[Optional[Path], dict[int, list[str]]] = defaultdict(lambda: defaultdict(list))
 
     for message in messages:
         if message.source == "pylint":
@@ -86,15 +89,15 @@ def _parse_pylint_informational(messages: list[Message]) -> tuple[set[Path], dic
 
 def get_suppressions(
     filepaths: list[Path], messages: list[Message]
-) -> tuple[set[Path], dict[Path, set[int]], dict[Path, dict[int, set[tuple[str, str]]]]]:
+) -> tuple[set[Optional[Path]], dict[Path, set[int]], dict[Optional[Path], dict[int, set[tuple[str, str]]]]]:
     """
     Given every message which was emitted by the tools, and the
     list of files to inspect, create a list of files to ignore,
     and a map of filepath -> line-number -> codes to ignore
     """
-    paths_to_ignore: set[Path] = set()
+    paths_to_ignore: set[Optional[Path]] = set()
     lines_to_ignore: dict[Path, set[int]] = defaultdict(set)
-    messages_to_ignore: dict[Path, dict[int, set[tuple[str, str]]]] = defaultdict(lambda: defaultdict(set))
+    messages_to_ignore: dict[Optional[Path], dict[int, set[tuple[str, str]]]] = defaultdict(lambda: defaultdict(set))
 
     # first deal with 'noqa' style messages
     for filepath in filepaths:
@@ -113,12 +116,12 @@ def get_suppressions(
     # now figure out which messages were suppressed by pylint
     pylint_ignore_files, pylint_ignore_messages = _parse_pylint_informational(messages)
     paths_to_ignore |= pylint_ignore_files
-    for filepath, line in pylint_ignore_messages.items():
+    for pylint_filepath, line in pylint_ignore_messages.items():
         for line_number, codes in line.items():
             for code in codes:
-                messages_to_ignore[filepath][line_number].add(("pylint", code))
+                messages_to_ignore[pylint_filepath][line_number].add(("pylint", code))
                 if code in _PYLINT_EQUIVALENTS:
                     for equivalent in _PYLINT_EQUIVALENTS[code]:
-                        messages_to_ignore[filepath][line_number].add(equivalent)
+                        messages_to_ignore[pylint_filepath][line_number].add(equivalent)
 
     return paths_to_ignore, lines_to_ignore, messages_to_ignore

prospector/tools/ruff/__init__.py

@@ -47,6 +47,16 @@ def run(self, found_files: FileFinder) -> list[Message]:
         completed_process = subprocess.run(  # noqa: S603
             [self.ruff_bin, *self.ruff_args, *found_files.python_modules], capture_output=True
         )
+        if not completed_process.stdout:
+            messages.append(
+                Message(
+                    "ruff",
+                    "",
+                    Location(None, None, None, None, None),
+                    completed_process.stderr.decode(),
+                )
+            )
+            return messages
         for message in json.loads(completed_process.stdout):
             sub_message = {}
             if message.get("url"):

tests/test_message.py

@@ -25,7 +25,6 @@ def test_strings_or_paths(self):
 
     def test_bad_path_input(self):
         self.assertRaises(ValueError, Location, 3.2, "module", "func", 1, 2)
-        self.assertRaises(ValueError, Location, None, "module", "func", 1, 2)
 
 
 class LocationOrderTest(TestCase):