feat(fixers): add fixer for reraise

src/tryceratops/fixers/__init__.py

@@ -0,0 +1 @@
+from .exception_block import VerboseReraiseFixer

src/tryceratops/fixers/exception_block.py

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+import re
+from abc import ABC, abstractmethod
+from typing import List, Tuple
+
+from tryceratops.violations import Violation, codes
+
+
+class BaseFixer(ABC):
+    violation_code: Tuple[str, str]
+
+    @classmethod
+    def _filter_violations_in_scope(cls, violations: List[Violation]) -> List[Violation]:
+        scope_code, _ = cls.violation_code
+        relevant = [vio for vio in violations if vio.code == scope_code]
+        return relevant
+
+    @classmethod
+    @abstractmethod
+    def _perform_fix(cls, violation: Violation):
+        pass
+
+    @classmethod
+    def fix(cls, violations: List[Violation]):
+        relevant_violations = cls._filter_violations_in_scope(violations)
+        for violation in relevant_violations:
+            cls._perform_fix(violation)
+
+
+class VerboseReraiseFixer(BaseFixer):
+    violation_code = codes.VERBOSE_RERAISE
+
+    @classmethod
+    def _perform_fix(cls, violation: Violation):
+        with open(violation.filename, "r+") as file:
+            all_lines = file.readlines()
+
+            guilty_line = all_lines[violation.line - 1]
+            new_line = re.sub(r"raise.*", "raise", guilty_line)
+            all_lines[violation.line - 1] = new_line
+
+            file.seek(0)
+            file.writelines(all_lines)
+            file.truncate()