continued refactor streak

utility.py

@@ -0,0 +1,58 @@
+from functools import wraps
+from tempfile import mkdtemp
+from shutil import rmtree
+from subprocess import check_output
+
+
+VERBOSE = True
+
+def call_verbose(before_message='', after_message='Done!'):
+    def tag(f):
+        @wraps(f)
+        def wrapper(*args, **kwargs):
+            print_opt(before_message, end='', flush=True)
+            f(*args, **kwargs)
+            print_opt(after_message)
+        return wrapper
+    return tag
+
+def print_opt(*args, **kwargs):
+    if VERBOSE:
+        print(*args, **kwargs)
+
+
+def yes_no_question(question, default):
+    valid = {"yes": True, "y": True, "ye": True,
+             "no": False, "n": False}
+    if default is None:
+        prompt = " [y/n] "
+    elif default == "yes":
+        prompt = " [Y/n] "
+    elif default == "no":
+        prompt = " [y/N] "
+    else:
+        raise ValueError("Invalid default answer: {}!".format(default))
+
+    while True:
+        print(question + prompt)
+        choice = input().lower()
+        if default is not None and choice == '':
+            return valid[default]
+        elif choice in valid:
+            return valid[choice]
+        else:
+            print("Please respond with 'yes'(y) or 'no'(n)!")
+
+
+# tempfile.TemporaryDirectory replacement to provide backwards compatibility
+class temporary_directory:
+    def __enter__(self):
+        self.name = mkdtemp()
+        return self.name
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        rmtree(self.name)
+
+
+def get_output(*args, **kwargs):
+    return check_output(*args, **kwargs).decode().rstrip('\n')