mypy: Use class-based API for enum.IntEnum

See https://github.com/python/mypy/issues/4865

qutebrowser/browser/downloads.py

@@ -40,7 +40,11 @@ from qutebrowser.utils import (usertypes, standarddir, utils, message, log,
 from qutebrowser.qt import sip
 
 
-ModelRole = enum.IntEnum('ModelRole', ['item'], start=Qt.UserRole)
+class ModelRole(enum.IntEnum):
+
+    """Custom download model roles."""
+
+    item = Qt.UserRole
 
 
 # Remember the last used directory

qutebrowser/mainwindow/tabwidget.py

@@ -37,8 +37,11 @@ from qutebrowser.misc import objects
 from qutebrowser.browser import browsertab
 
 
-PixelMetrics = enum.IntEnum('PixelMetrics', ['icon_padding'],
-                            start=QStyle.PM_CustomBase)
+class PixelMetrics(enum.IntEnum):
+
+    """Custom PixelMetrics attributes."""
+
+    icon_padding = QStyle.PM_CustomBase
 
 
 class TabWidget(QTabWidget):

qutebrowser/misc/backendproblem.py

@@ -38,10 +38,14 @@ from qutebrowser.utils import usertypes, objreg, version, qtutils, log, utils
 from qutebrowser.misc import objects, msgbox
 
 
-_Result = enum.IntEnum(
-    '_Result',
-    ['quit', 'restart', 'restart_webkit', 'restart_webengine'],
-    start=QDialog.Accepted + 1)
+class _Result(enum.IntEnum):
+
+    """The result code returned by the backend problem dialog."""
+
+    quit = QDialog.Accepted + 1
+    restart = QDialog.Accepted + 2
+    restart_webkit = QDialog.Accepted + 3
+    restart_webengine = QDialog.Accepted + 4
 
 
 @attr.s

qutebrowser/misc/crashdialog.py

@@ -42,8 +42,12 @@ from qutebrowser.misc import (miscwidgets, autoupdate, msgbox, httpclient,
 from qutebrowser.config import config, configfiles
 
 
-Result = enum.IntEnum('Result', ['restore', 'no_restore'],
-                      start=QDialog.Accepted + 1)
+class Result(enum.IntEnum):
+
+    """The result code returned by the crash dialog."""
+
+    restore = QDialog.Accepted + 1
+    no_restore = QDialog.Accepted + 2
 
 
 def parse_fatal_stacktrace(text):

qutebrowser/utils/usertypes.py

@@ -221,10 +221,17 @@ KeyMode = enum.Enum('KeyMode', ['normal', 'hint', 'command', 'yesno', 'prompt',
                                 'jump_mark', 'record_macro', 'run_macro'])
 
 
-# Exit statuses for errors. Needs to be an int for sys.exit.
-Exit = enum.IntEnum('Exit', ['ok', 'reserved', 'exception', 'err_ipc',
-                             'err_init', 'err_config', 'err_key_config'],
-                    start=0)
+class Exit(enum.IntEnum):
+
+    """Exit statuses for errors. Needs to be an int for sys.exit."""
+
+    ok = 0
+    reserved = 1
+    exception = 2
+    err_ipc = 3
+    err_init = 4
+    err_config = 5
+    err_key_config = 6
 
 
 # Load status of a tab