feat: improve input handling and add context length option

This commit introduces several improvements to the input handling process:

- Implemented `improved_input()` to handle multi-line input and prevent accidental sending of pasted content.  The user signals completion by pressing Ctrl+D or entering two consecutive empty lines.
- Added a new command-line argument `--context` to allow users to specify the context length for the model.
- Updated the help message to reflect the new argument.

assistant.py

@@ -15,6 +15,7 @@ server = 'localhost:11434'
 model = 'gemma3:12b'
 reasoning_model='deepseek-r1:14b'
 temp = 0.2
+num_ctx = 4096
 
 
 pattern = r'```[a-z]*\n[\s\S]*?\n```'
@@ -161,7 +162,7 @@ def chat(message, stream=True):
     history.append({"role": "user", "content": message})
     completion = client.chat(
             model=model,
-            options={"temperature":temp, "num_ctx":4096},
+            options={"temperature":temp, "num_ctx":num_ctx},
             messages=history,
             stream=stream
             )
@@ -256,10 +257,14 @@ def parse_args():
     parser.add_argument('--model', '-m', nargs='?', const=True, default=False, help='Specify model')
     # Add the --temp (-t) argument
     parser.add_argument('--temp', '-t', nargs='?', const=True, default=False, help='Specify temperature')
+    # Add the --context 
+    parser.add_argument('--context', nargs='?', const=True, default=False, help='Specify temperature')
     # Add the --host argument
     parser.add_argument('--host', nargs='?', const=True, default=False, help='Specify host of ollama server')
     # Add the --reflect argument
     parser.add_argument('--reasoning', '-r', action='store_true', help='Use the default reasoning model deepseek-r1:14b')
+    # Add the --new argument
+    parser.add_argument('--new', '-n', action='store_true', help='Start a chat with a fresh history')
     # Parse the arguments
     return parser.parse_args()
 
@@ -328,6 +333,36 @@ def handle_piped_input(args):
     if args.copy and len(blocks):
         copy_string_to_clipboard(blocks[0])
 
+def improved_input():
+    """
+    Handles multi-line input and prevents accidental sending of pasted content.
+    Returns the complete input text when the user indicates they're done.
+    """
+    lines = []
+    while True:
+        try:
+            line = sys.stdin.readline()
+            if not line:
+                break  # EOF
+            if line.strip() == '':
+                continue  # ignore empty lines
+            lines.append(line)
+
+            # Check for termination signal (Ctrl+D or two consecutive empty lines)
+            if len(lines) > 1 and lines[-2] == '\n' and lines[-1] == '\n':
+                break
+
+        except KeyboardInterrupt:
+            print("\nUser aborted input")
+            return None
+        except Exception as e:
+            print(f"Error reading input: {e}")
+            return None
+
+    # Join the lines and strip any trailing newlines
+    full_input = ''.join(lines).rstrip('\n')
+    return full_input
+
 def handle_non_piped_input(args):
     if args.shell:
         arg_shell(args)
@@ -336,18 +371,28 @@ def handle_non_piped_input(args):
         user_input = arg_follow_up(args)
         result = chat2(args, user_input)
         exit()
+
     global history
     history = load_history(history_path)
+
+    print("\033[91massistant\033[0m: Type your message (press Ctrl+D to send):")
     while True:
         try:
-            user_input = input('> ')
-        except (EOFError, KeyboardInterrupt):
-            print()
-            exit()
-        else:
-            result = chat2(args, user_input)
+            full_input = improved_input()
+            if full_input is None:
+                break  # User aborted
+            if full_input.strip() == '':
+                continue  # Skip empty messages
+
+            result = chat2(args, full_input)
             save_history(history, history_path)
 
+        except (EOFError, KeyboardInterrupt):
+            print("\nExiting...")
+            break
+        except Exception as e:
+            print(f"Error: {e}")
+
 client = None
 
 def main():
@@ -363,6 +408,13 @@ def main():
     if args.temp:
         global temp
         temp = float(args.temp)
+    if args.context:
+        global num_ctx
+        num_ctx = float(args.context)
+    if args.new:
+        global history
+        history = [system_prompt]
+        save_history(history, history_path)
     if not sys.stdin.isatty():
         handle_piped_input(args)
     else: