refactored subshell execution code for greater readability and moved …

…it to utils

bitsandbytes/cuda_setup.py

@@ -19,24 +19,13 @@
 """
 
 import ctypes
-import shlex
-import subprocess
 from os import environ as env
 from pathlib import Path
 from typing import Set, Union
 
 from .utils import print_err, warn_of_missing_prerequisite
 
 
-def execute_and_return(strCMD):
-    proc = subprocess.Popen(
-        shlex.split(strCMD), stdout=subprocess.PIPE, stderr=subprocess.PIPE
-    )
-    out, err = proc.communicate()
-    out, err = out.decode("UTF-8").strip(), err.decode("UTF-8").strip()
-    return out, err
-
-
 def check_cuda_result(cuda, result_val):
     if result_val != 0:
         cuda.cuGetErrorString(result_val, ctypes.byref(error_str))

bitsandbytes/utils.py

@@ -1,6 +1,28 @@
+import shlex
+import subprocess
 import sys
 
 
+def execute_and_return(command_string: str) -> Tuple[str, str]:
+    def _decode(subprocess_err_out_tuple):
+        return tuple(
+            to_decode.decode("UTF-8").strip()
+            for to_decode in subprocess_err_out_tuple
+        )
+
+    def execute_and_return_decoded_std_streams(command_string):
+        return _decode(
+            subprocess.Popen(
+                shlex.split(command_string),
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            ).communicate()
+        )
+
+    std_out, std_err = execute_and_return_decoded_std_streams()
+    return std_out, std_err
+
+
 def print_err(s: str) -> None:
     print(s, file=sys.stderr)