feat: pyproject.toml support

mutmut/__main__.py

@@ -957,36 +957,59 @@ def should_ignore_for_mutation(self, path):
         return False
 
 
-@lru_cache()
-def read_config():
+def config_reader():
+    path=Path("pyproject.toml")
+    if path.exists():
+        if sys.version_info >= (3, 11):
+            from tomllib import loads
+        else:
+            from toml import loads
+        data = loads(path.read_text("utf-8"))
+
+        try:
+            config = data["tool"]["mutmut"]
+        except KeyError:
+            pass
+        else:
+            def s(key,default):
+                try:
+                    result=config[key]
+                except KeyError:
+                    return default
+                return result
+            return s
+
     config_parser = ConfigParser()
     config_parser.read('setup.cfg')
 
     def s(key, default):
         try:
-            return config_parser.get('mutmut', key)
+            result= config_parser.get('mutmut', key)
         except (NoOptionError, NoSectionError):
             return default
+        if isinstance(default,list):
+            result=[x for x in result.split("\n") if x]
+        elif isinstance(default,int):
+            result=int(result)
+        return result
+    return s
+
+@lru_cache()
+def read_config():
+
+    s=config_reader()
 
     mutmut.config = Config(
-        do_not_mutate=[
-            x
-            for x in s('do_not_mutate', '').split('\n')
-            if x
-        ],
+        do_not_mutate=s('do_not_mutate', []),
         also_copy=[
             Path(y)
-            for y in [
-                x
-                for x in s('also_copy', '').split('\n')
-                if x
-            ]
+            for y in s('also_copy', [])
         ]+[
             Path('tests/'),
             Path('test/'),
             Path('tests.py'),
         ],
-        max_stack_depth=int(s('max_stack_depth', '-1'))
+        max_stack_depth=s('max_stack_depth', -1)
     )
 
 

requirements.txt

@@ -3,3 +3,4 @@ click
 junit-xml==1.8
 setproctitle
 textual
+toml>=0.10.2; python_version < '3.11'