enable --pretty by default

Author: mkaraev

mypy/main.py

@@ -991,7 +991,8 @@ def add_invertible_flag(
         group=error_group,
     )
     add_invertible_flag(
-        "--pretty",
+        "--no-pretty",
+        dest="pretty",
         default=True,
         help="Use visually nicer output in error messages:"
         " Use soft word wrap, show source code snippets,"

mypy/options.py

@@ -356,7 +356,7 @@ def __init__(self) -> None:
         self.hide_error_codes = False
         self.show_error_code_links = False
         # Use soft word wrap and show trimmed source snippets with error location markers.
-        self.pretty = False
+        self.pretty = True
         self.dump_graph = False
         self.dump_deps = False
         self.logical_deps = False