Fix missing --no-fix.

If `fix=true` is set in the `pyproject.toml` file, ruff will return
the file instead of diagnostics. Adding `--no-fix` avoids this.

Author: jhossbach

pylsp_ruff/ruff_lint.py

@@ -187,6 +187,8 @@ def build_args(document: Document, options: dict) -> list:
     args = ["--quiet"]
     # Use the json formatting for easier evaluation
     args.extend(["--format=json"])
+    # Do not attempt to fix -> returns file instead of diagnostics
+    args.extend(["--no-fix"])
 
     # Convert per-file-ignores dict to right format
     per_file_ignores = options.pop("per-file-ignores")

tests/test_ruff_lint.py

@@ -148,6 +148,7 @@ def test_ruff_multiline(workspace):
         "ruff",
         "--quiet",
         "--format=json",
+        "--no-fix",
         "--exclude=blah,file_2.py",
         "--",
         "-",