evolved-todo 1.5.0

Enhanced CLI-based todo application with rich visual formatting

Phase I.5: Todo CLI App - Enhanced Interface

An in-memory Python CLI todo application with rich visual formatting, built using spec-first, AI-driven development principles.

Features

• ✅ Add Tasks: Create tasks with title and optional description
• ✅ View Tasks: Display all tasks in styled table with color-coded status
• ✅ Update Tasks: Modify task title and/or description
• ✅ Delete Tasks: Permanently remove tasks from the list
• ✅ Toggle Status: Mark tasks as complete or incomplete

Enhanced UI Features (v1.5)

• 🎨 Color-Coded Status: Green ✓ for complete tasks, yellow ⏳ for incomplete
• 📊 Styled Tables: Aligned columns (ID, Status, Title, Description) with proper spacing
• ✅ Success Messages: Green [OK] prefix for successful operations
• ❌ Error Messages: Red [ERROR] prefix for failures and validation errors
• ℹ️ Info Messages: Blue [INFO] for neutral feedback (e.g., "No tasks found")
• 🎯 Styled Menu: Professional header panel with cyan-colored options
• ⌨️ Styled Prompts: Cyan-colored input prompts with validation
• 🔄 Cross-Platform: Works on Windows, macOS, Linux with automatic fallback to ASCII if needed

Quick Start

Prerequisites

• Python 3.13+ (Download Python)
• UV package manager (optional but recommended)

Installation

# Clone the repository
git clone <repository-url>
cd hackathon-evolution-todo

# Checkout the feature branch
git checkout 001-todo-cli-app

# Install UV (if not already installed)
# macOS/Linux:
curl -LsSf https://astral.sh/uv/install.sh | sh

# Windows (PowerShell):
powershell -c "irm https://astral.sh/uv/install.sh | iex"

Running the Application

Option 1: Using Python directly

python src/main.py

Option 2: Using UV (recommended)

uv run python src/main.py

Usage

Once the application starts, you'll see a menu with 6 options:

==============================
    Todo List Manager
==============================
1. Add Task
2. View Tasks
3. Update Task
4. Delete Task
5. Toggle Task Status
6. Exit
==============================

Example Workflow

# 1. Add a task
Select option (1-6): 1
Enter task title: Buy groceries
Enter task description (optional): Milk, eggs, bread

✓ Success! Task 1 created: Buy groceries

# 2. View all tasks
Select option (1-6): 2

--- All Tasks ---

[ ] Task 1: Buy groceries
   Description: Milk, eggs, bread

# 3. Mark task as complete
Select option (1-6): 5
Enter task ID to toggle: 1

✓ Success! Task 1 marked as complete
   [✓] Buy groceries

# 4. Update task
Select option (1-6): 3
Enter task ID to update: 1

Leave blank and press Enter to keep current value:
New title: Buy groceries and snacks
New description: 

✓ Success! Task 1 updated
   Title: Buy groceries and snacks
   Description: Milk, eggs, bread

# 5. Delete task
Select option (1-6): 4
Enter task ID to delete: 1

✓ Success! Task 1 deleted

# 6. Exit
Select option (1-6): 6

==============================
  Exiting... Goodbye!
==============================

Project Structure

.
├── src/
│   ├── __init__.py          # Package initialization
│   ├── models.py            # Task dataclass
│   ├── todo_manager.py      # Business logic (CRUD operations)
│   └── main.py              # CLI interface
├── tests/
│   └── manual_test_checklist.md  # Manual testing scenarios
├── specs/
│   └── 001-todo-cli-app/    # Feature specifications and design docs
├── pyproject.toml           # Project configuration
├── CLAUDE.md                # Claude Code prompt history
└── README.md                # This file

Key Components

• models.py: Defines the Task dataclass with id, title, description, and status fields
• todo_manager.py: Implements TodoManager class with in-memory storage using dict[int, Task]
• main.py: Provides CLI interface with menu-driven navigation and user input handling

Development

Code Quality

The project follows strict quality standards:

• PEP 8 compliant: All code follows Python style guidelines
• Type hints: Full type annotations on all functions
• Docstrings: Google-style docstrings for all classes and functions
• Linting: Passes ruff checks with zero errors

# Run linting
ruff check src/

# Auto-fix issues
ruff check --fix src/

Testing

Manual testing checklist available at tests/manual_test_checklist.md with 15 test scenarios covering all 5 user stories.

Design Principles

This project follows the Project Constitution principles:

1. ✅ Spec-First Development: Complete specification before implementation
2. ✅ AI-Driven Architecture: All code generated via Claude Code
3. ✅ Iterative Evolution: Phase I (CLI) → Phase II (Persistence) → Phase III+ (Web/Distributed)
4. ✅ Product Thinking: User-focused design with clear value priorities
5. ✅ Process Documentation: Full traceability via specs, plans, and prompt history
6. ✅ Quality Gates: PEP 8 compliance, type hints, manual testing

Technical Details

• Language: Python 3.13+
• Dependencies: Python standard library only (no external packages)
• Storage: In-memory using dict[int, Task] (data lost on exit per Phase I design)
• ID Generation: Sequential integers starting from 1
• Status Representation: Boolean (False = incomplete, True = complete)
• Error Handling: Custom exceptions (TaskNotFoundError, InvalidInputError)

Constraints & Limitations

Phase I Scope (by design):

• ❌ No persistence (tasks lost when app closes)
• ❌ No advanced features (priorities, tags, search, filters)
• ❌ No web interface or API
• ❌ No multi-user support
• ❌ Single session only (up to 100 tasks recommended)

Future Phases:

• Phase II: File-based persistence (JSON/SQLite)
• Phase III: REST API and web frontend
• Phase IV: Distributed features (sync, collaboration)
• Phase V: AI integration and cloud-native deployment

Documentation

• Specification: Feature requirements and acceptance criteria
• Implementation Plan: Architecture and technical decisions
• Data Model: Entity design and validation rules
• Task Breakdown: 60-task implementation plan
• Claude Code Prompts: AI-driven development history
• Constitution: Project principles and governance

Troubleshooting

Common Issues

Issue: ModuleNotFoundError: No module named 'src' Solution: Run from project root directory, not from src/ subdirectory

Issue: python: command not found Solution: Use python3 or python3.13 if you have multiple Python versions

Issue: Ruff not found Solution: Install ruff with pip install ruff or uv pip install ruff

Issue: Application doesn't respond to input Solution: Ensure you're running in an interactive terminal, not a non-interactive shell

Contributing

This is an educational project following spec-driven development. To contribute:

1. Read the Project Constitution
2. Follow the spec → plan → tasks → implement workflow
3. Document all Claude Code prompts in CLAUDE.md
4. Ensure code passes ruff check with zero errors
5. Test against all 15 manual test scenarios

License

Educational project - see repository license for details.

Acknowledgments

Built using:

• Claude Code: AI-driven development agent
• Spec-Kit Plus: Specification management framework
• UV: Modern Python package manager

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Version: 1.0.0 (Phase I Complete) Last Updated: 2025-12-29 Branch: 001-todo-cli-app