feat: Option to modify commit args before submit

Command line args to be sent to 'git commit' command can be modified
just before confirming the commit (after all the text has been
written!).

Resolve #27

Author: nebbles

gitcommit/gitcommit.py

@@ -365,15 +365,13 @@ def run():
 
     # print("\nNOTE: This was a dry run and no commit was made.\n")
 
+    # Extra command line arguments for git commit
     argv_passthrough = []  # by default add no extra arguments
-
-    # Warn of extra command line arguments
     if len(sys.argv) > 1:
-        Ansi.print_warning(
-            "The following additional arguments will be passed to git commit: ", end=""
-        )
-        Ansi.print_warning(sys.argv[1:])
         argv_passthrough = sys.argv[1:]  # overwrite default list
+    existing_args = " ".join(argv_passthrough)
+    text = Ansi.colour(Ansi.fg.bright_yellow, "Extra args for git commit: ")
+    argv_passthrough = prompt(ANSI(text), default=existing_args).split(" ")
 
     # Ask for confirmation to commit
     confirmation_validator = YesNoValidator(answer_required=True)