From a497570fcb364b40e0d952d3133e8d4f2d329fea Mon Sep 17 00:00:00 2001
From: Richard Si <63936253+ichard26@users.noreply.github.com>
Date: Sun, 27 Dec 2020 21:38:11 -0500
Subject: [PATCH] Bump mypy to 0.780 in pre-commit config (#1887)

To avoid hitting a mypy bug causes pre-commit to always fail on CPython
3.9. Even though it's still an outdated version, the bug effectively
blocks development on CPython 3.9 so that's why this commit exists
instead of waiting for cooperlees to finish his bump to 0.790 PR.

Also this fixes primer to ensure it always raises CalledProcessError
with an int error code. I stole the patch from cooperlees's mypy bump
PR.

It's funny how mypy 0.790 is already asked for in our
Pipfile.lock file, but oh well mypy is probably more commonly run
through pre-commit than standalone I guess.

Oh and if you're curious why the bug doesn't up on CPython 3.8 or lower:
there was some subscription AST changes in CPython 3.9.
---
 .pre-commit-config.yaml | 2 +-
 src/black_primer/lib.py | 8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 667b22d..4e12e46 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,7 +18,7 @@ repos:
         additional_dependencies: [flake8-bugbear]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.770
+    rev: v0.780
     hooks:
       - id: mypy
         exclude: ^docs/conf.py
diff --git a/src/black_primer/lib.py b/src/black_primer/lib.py
index afeb072..5c5576e 100644
--- a/src/black_primer/lib.py
+++ b/src/black_primer/lib.py
@@ -59,10 +59,12 @@ async def _gen_check_output(
         raise
 
     if process.returncode != 0:
+        returncode = process.returncode
+        if returncode is None:
+            returncode = 69
+
         cmd_str = " ".join(cmd)
-        raise CalledProcessError(
-            process.returncode, cmd_str, output=stdout, stderr=stderr
-        )
+        raise CalledProcessError(returncode, cmd_str, output=stdout, stderr=stderr)
 
     return (stdout, stderr)
 
-- 
2.39.2