Prevent crash when parsing the toml to also crash pylint

Refer to #3181

Author: Pierre-Sassoulas

pylint/config/option_manager_mixin.py

@@ -274,7 +274,10 @@ def read_config_file(self, config_file=None, verbose=None):
             self.set_current_module(config_file)
             parser = self.cfgfile_parser
             if config_file.endswith(".toml"):
-                self._parse_toml(config_file, parser)
+                try:
+                    self._parse_toml(config_file, parser)
+                except toml.TomlDecodeError as e:
+                    self.add_message("config-parse-error", line=0, args=str(e))
             else:
                 # Use this encoding in order to strip the BOM marker, if any.
                 with open(config_file, encoding="utf_8_sig") as fp:

pylint/lint/pylinter.py

@@ -98,6 +98,11 @@ def _load_reporter_by_class(reporter_class: str) -> type:
         "Used when an exception occurred while building the Astroid "
         "representation which could be handled by astroid.",
     ),
+    "F0011": (
+        "error while parsing the configuration: %s",
+        "config-parse-error",
+        "Used when an exception occurred while parsing a pylint configuration file.",
+    ),
     "I0001": (
         "Unable to run raw checkers on built-in module %s",
         "raw-checker-failed",

tests/config/functional/toml/issue_3181/toml_decode_error.1.out

@@ -0,0 +1,2 @@
+************* Module {abspath}
+{relpath}:1:0: F0010: error while code parsing: Found invalid character in key name: '*'. Try quoting the key name. (line 3 column 2 char 48) (parse-error)

tests/config/functional/toml/issue_3181/toml_decode_error.toml

@@ -0,0 +1,3 @@
+# TOML decode error crash pylint
+[tool.pylint]
+***

tests/config/functional/toml/issue_3181/top_level_list_of_disable.out

@@ -0,0 +1,3 @@
+************* Module {abspath}
+{relpath}:1:0: E0014: Out-of-place setting encountered in top level configuration-section 'max-line-length' : '120' (bad-configuration-section)
+{relpath}:1:0: E0014: Out-of-place setting encountered in top level configuration-section 'disable' : '['C0330']' (bad-configuration-section)

tests/config/functional/toml/issue_3181/top_level_list_of_disable.toml

@@ -0,0 +1,4 @@
+# This crashed previously see https://github.com/PyCQA/pylint/issues/3181
+[tool.pylint]
+max-line-length = 120
+disable = ["C0330"]