2 files changed, 51 insertions, 20 deletions

diff --git a/src/gpt_chat_cli/argparsing.py b/src/gpt_chat_cli/argparsing.py
index 4597e84..e9183a9 100644
--- a/src/gpt_chat_cli/argparsing.py
+++ b/src/gpt_chat_cli/argparsing.py
@@ -19,7 +19,7 @@ def die_validation_err(err : str):
     print(err, file=sys.stderr)
     sys.exit(1)
 
-def validate_args(args: argparse.Namespace) -> None:
+def validate_args(args: argparse.Namespace, debug : bool = False) -> None:
     if not 0 <= args.temperature <= 2:
         die_validation_err("Temperature must be between 0 and 2.")
 
@@ -38,6 +38,16 @@ def validate_args(args: argparse.Namespace) -> None:
     if args.n_completions < 1:
         die_validation_err("Number of completions must be greater than or equal to 1.")
 
+    if args.interactive and args.n_completions != 1:
+        die_validation_err("Only a single completion can be used in interactive mode")
+
+    if debug and args.interactive:
+
+        if args.interactive and (
+            args.save_response_to_file or args.load_response_from_file
+        ):
+            die_validation_err("Save and load operations cannot be used in interactive mode")
+
 @dataclass
 class CompletionArguments:
     model: str
@@ -66,6 +76,7 @@ class Arguments:
     display_args: DisplayArguments
     version: bool
     list_models: bool
+    interactive: bool
     debug_args: Optional[DebugArguments] = None
 
 def split_arguments(args: argparse.Namespace) -> Arguments:
@@ -96,6 +107,7 @@ def split_arguments(args: argparse.Namespace) -> Arguments:
            debug_args=debug_args,
            version=args.version,
            list_models=args.list_models,
+           interactive=args.interactive
     )
 
 def parse_args() -> Arguments:
@@ -217,12 +229,19 @@ def parse_args() -> Arguments:
     )
 
     parser.add_argument(
+        "-i",
+        "--interactive",
+        action="store_true",
+        help="Start an interactive session"
+    )
+
+    parser.add_argument(
         "message",
         type=str,
         nargs='?',
         help=(
-            "The contents of the message. When used in chat mode, this is the initial "
-            "message if provided."
+            "The contents of the message. When in a interactive session, this is "
+            " the initial prompt provided."
         ),
     )
 
@@ -268,10 +287,14 @@ def parse_args() -> Arguments:
         else:
             args.adornments = AutoDetectedOption.OFF
 
+    if args.message is None:
+        if sys.stdin.isatty():
+            args.interactive = True
+
     if not debug:
         args.load_response_from_file = None
         args.save_response_to_file = None
 
-    validate_args(args)
+    validate_args(args, debug=debug)
 
     return split_arguments(args)
diff --git a/src/gpt_chat_cli/gcli.py b/src/gpt_chat_cli/gcli.py
index a9d36e4..2d40cf2 100644
--- a/src/gpt_chat_cli/gcli.py
+++ b/src/gpt_chat_cli/gcli.py
@@ -132,22 +132,21 @@ def print_streamed_response(
             else:
                 print(end='\n', flush=True)
 
-def main():
-    args = parse_args()
-
-    if args.version:
-        print(f'version {VERSION}')
-        sys.exit(0)
+def cmd_version():
+    print(f'version {VERSION}')
 
-    if args.list_models:
+def cmd_list_models():
+    for model in list_models():
+        print(model)
 
-        for model in list_models():
-            print(model)
+def cmd_interactive(args : Arguments):
+    COLOR_CODE = get_color_codes(no_color = not args.display_args.color)
 
-        sys.exit(0)
+    print(f'GPT Chat CLI {VERSION}')
+    print(f'[{COLOR_CODE.WHITE}#{COLOR_CODE.RESET}]', end=' ', flush=True)
 
+def cmd_singleton(args: Arguments):
     completion_args = args.completion_args
-    COLOR_CODE = get_color_codes(no_color = not args.display_args.color)
 
     debug_args : DebugArguments = args.debug_args
 
@@ -157,11 +156,7 @@ def main():
     elif debug_args.load_response_from_file:
         completion_args, completion = load_response_and_arguments(args)
     else:
-        if args.completion_args.message is None:
-            if sys.stdin.isatty():
-                print(f'GPT Chat CLI {VERSION}')
-                print(f'[{COLOR_CODE.WHITE}#{COLOR_CODE.RESET}]', end=' ', flush=True)
-
+        if completion_args.message is None:
             completion_args.message = sys.stdin.read()
 
         completion = create_chat_completion_from_args(completion_args)
@@ -172,5 +167,18 @@ def main():
         completion_args.n_completions
     )
 
+
+def main():
+    args = parse_args()
+
+    if args.version:
+        cmd_version()
+    elif args.list_models:
+        cmd_list_models()
+    elif args.interactive:
+        cmd_interactive(args)
+    else:
+        cmd_singleton(args)
+
 if __name__ == "__main__":
     main()