Move hash_file to utils.misc

Why: Allows for better code usablity without introducing a
wheel->wheel_builder dependency.

src/pip/_internal/utils/misc.py

@@ -7,6 +7,7 @@
 import contextlib
 import errno
 import getpass
+import hashlib
 import io
 import logging
 import os
@@ -868,3 +869,17 @@ def is_console_interactive():
     """Is this console interactive?
     """
     return sys.stdin is not None and sys.stdin.isatty()
+
+
+def hash_file(path, blocksize=1 << 20):
+    # type: (str, int) -> Tuple[Any, int]
+    """Return (hash, length) for path using hashlib.sha256()
+    """
+
+    h = hashlib.sha256()
+    length = 0
+    with open(path, 'rb') as f:
+        for block in read_chunks(f, size=blocksize):
+            length += len(block)
+            h.update(block)
+    return (h, length)  # type: ignore

src/pip/_internal/wheel.py

@@ -31,9 +31,8 @@
     UnsupportedWheel,
 )
 from pip._internal.locations import get_major_minor_version
-from pip._internal.utils.misc import captured_stdout, ensure_dir
+from pip._internal.utils.misc import captured_stdout, ensure_dir, hash_file
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.wheel_builder import hash_file
 
 if MYPY_CHECK_RUNNING:
     from typing import (

src/pip/_internal/wheel_builder.py

@@ -13,7 +13,7 @@
 from pip._internal.models.link import Link
 from pip._internal.utils.logging import indent_log
 from pip._internal.utils.marker_files import has_delete_marker_file
-from pip._internal.utils.misc import ensure_dir, read_chunks
+from pip._internal.utils.misc import ensure_dir, hash_file
 from pip._internal.utils.setuptools_build import (
     make_setuptools_bdist_wheel_args,
     make_setuptools_clean_args,
@@ -32,7 +32,7 @@
 
 if MYPY_CHECK_RUNNING:
     from typing import (
-        Any, Callable, Iterable, List, Optional, Pattern, Text, Tuple, Union,
+        Any, Callable, Iterable, List, Optional, Pattern, Text, Union,
     )
 
     from pip._internal.cache import WheelCache
@@ -46,18 +46,6 @@
 logger = logging.getLogger(__name__)
 
 
-def hash_file(path, blocksize=1 << 20):
-    # type: (str, int) -> Tuple[Any, int]
-    """Return (hash, length) for path using hashlib.sha256()"""
-    h = hashlib.sha256()
-    length = 0
-    with open(path, 'rb') as f:
-        for block in read_chunks(f, size=blocksize):
-            length += len(block)
-            h.update(block)
-    return (h, length)  # type: ignore
-
-
 def replace_python_tag(wheelname, new_tag):
     # type: (str, str) -> str
     """Replace the Python tag in a wheel file name with a new value."""