Support reading config from pyproject.toml

Author: pslacerda

mypy/config_parser.py

@@ -156,12 +156,12 @@ def parse_toml_config_file(options: Options, set_strict_flags: Callable[[], None
     else:
         options.config_file = filename
 
-    if 'mypy' not in table:
-        print("%s: No [mypy] table in config file" % filename, file=stderr)
+    if 'tool' not in table or 'mypy' not in table['tool']:
+        print("%s: No 'tool.mypy' table in config file" % filename, file=stderr)
         return False
 
     # Handle the mypy table.
-    for key, value in table['mypy'].items():
+    for key, value in table['tool']['mypy'].items():
 
         # Is an option.
         if key != 'overrides':

test-data/unit/cmdline.test

@@ -173,7 +173,7 @@ def f():
 [case testWarnUnusedIgnores]
 # cmd: mypy main.py --config-file=pyproject.toml
 [file pyproject.toml]
-\[mypy]
+\[tool.mypy]
 warn_unused_ignores = true
 [file main.py]
 # type: ignore
@@ -186,17 +186,17 @@ main.py:1: error: unused 'type: ignore' comment
 [file main.py]
 # type: ignore
 [out]
-pyproject.toml: No [mypy] table in config file
+pyproject.toml: No 'tool.mypy' table in config file
 == Return code: 0
 
 [case testPerFileConfigSection]
 # cmd: mypy x.py y.py z.py
 [file pyproject.toml]
-\[mypy]
+\[tool.mypy]
 disallow_untyped_defs = true
-\[mypy.overrides.y]
+\[tool.mypy.overrides.y]
 disallow_untyped_defs = false
-\[mypy.overrides.z]
+\[tool.mypy.overrides.z]
 disallow_untyped_calls = true
 [file x.py]
 def f(a):