Refactor: Extract duplicated code into shared nmap_utils module

[Copilot]

The codebase contained ~88 lines of duplicated code between main_v1.6.py and main_v1.7.py, including banner display, user input prompts, and scan type selection logic.

Changes

Created nmap_utils.py - Shared module with 3 extracted functions:

• display_banner() - pyfiglet banner and welcome message
• get_target_info() - prompts for IP address and port/range input
• choose_scan_type() - displays scan menu (1-12) and validates selection

Refactored main_v1.6.py - 119 → 81 lines (32% reduction)

• Imports shared functions from nmap_utils
• Retains simple Unix-focused implementations of check_root(), run_scan(), construct_nmap_command()

Refactored main_v1.7.py - 221 → 183 lines (17% reduction)

• Imports shared functions from nmap_utils
• Retains enhanced implementations with Windows support, shlex parsing, and detailed error handling

Added .gitignore - Excludes __pycache__/, virtual environments, IDE files

Before/After

# Before: Duplicated in both files
banner = colored(pyfiglet.figlet_format("Nmap Scanning Tool"), "green")
print(banner)
print(colored("\n******************** Welcome... ********************", "cyan"))

def get_target_info():
    ip_address = input("\nEnter the IP address to scan: ").strip()
    port = input("Enter the port... [Leave blank for all ports]: ").strip()
    if not port:
        port = "1-65535"
    return ip_address, port

# After: Single implementation in nmap_utils.py
from nmap_utils import display_banner, get_target_info, choose_scan_type

display_banner()

Design Notes

Each version intentionally maintains separate construct_nmap_command() implementations due to different architectural needs:

• v1.6: Simple list construction, always includes port flag
• v1.7: Conditional port handling, shlex parsing for custom args, port flag deduplication

Left main_v1.1.py unchanged as it's a minimal reference implementation.

Original prompt

Find and refactor duplicated code

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