Expose generic mypy error as diagnostic

Author: rchl

.github/workflows/python-package.yml

@@ -38,8 +38,8 @@ jobs:
       run: |
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        # exit-zero treats all errors as warnings
+        flake8 . --count --exit-zero --statistics
     - name: Check black formatting
       run: |
         # stop the build if black detect any changes

pylsp_mypy/plugin.py

@@ -278,6 +278,20 @@ def pylsp_lint(
     log.debug("errors:\n%s", errors)
 
     diagnostics = []
+
+    # Expose generic mypy error on the first line.
+    if errors:
+        diagnostics.append({
+            "source": "mypy",
+            "range": {
+                "start": {"line": 0, "character": 0},
+                # Client is supposed to clip end column to line length.
+                "end": {"line": 0, "character": 1000},
+            },
+            "message": errors,
+            "severity": 1,  # Error
+        })
+
     for line in report.splitlines():
         log.debug("parsing: line = %r", line)
         diag = parse_line(line, document)

setup.cfg

@@ -23,6 +23,9 @@ install_requires =
     mypy
     toml
 
+[flake8]
+max-complexity = 10
+max-line-length = 127
 
 [options.entry_points]
 pylsp = pylsp_mypy = pylsp_mypy.plugin