buylog 0.1.8

A purchasing support tool with CLI and TUI interfaces for vendor quote management.

buylog

A Python tool to help you keep track of what you buy and want to buy.

Features

• Command Line Interface (CLI) - Full CRUD operations for managing brands, products, vendors, and quotes
• Text User Interface (TUI) - Interactive terminal UI built with Textual
• Data Persistence - SQLAlchemy ORM with SQLite support
• Multi-currency Support - Forex rate tracking with automatic currency conversion
• Quote Analysis - Best price highlighting, price history tracking, and price alerts
• Service Layer - Business logic separation with validation and error handling
• Audit Logging - Track entity creation, updates, and deletions
• Testing - pytest-based test suite with factory pattern

Installation

pip install buylog

To build

# Clone the repository
git clone https://github.com/shakfu/buylog
cd buylog

# Install dependencies
uv sync

# Or install with development dependencies
uv sync --group dev

Usage

Command Line Interface

The CLI supports comprehensive CRUD operations:

# Add entities
buylog add --brand apple
buylog add --brand apple --product iphone-14
buylog add --vendor amazon.com --currency USD
buylog add --vendor amazon.com --product iphone-14 --quote 600

# Add forex rates
buylog add-fx --code EUR --usd-per-unit 1.085
buylog add-fx --code GBP --usd-per-unit 1.27 --date 2025-01-15

# Add quotes with shipping and tax
buylog add --vendor amazon.com --product iphone-14 --quote 600 --shipping 10.00 --tax-rate 8.5

# List entities
buylog list brands
buylog list products
buylog list vendors
buylog list quotes
buylog list brands --filter apple

# Search across entities
buylog search iphone

# Update entities
buylog update brand apple --new-name Apple
buylog update product iphone-14 --new-name "iPhone 14"

# Delete entities
buylog delete brand --name apple
buylog delete product --name iphone-14
buylog delete vendor --name amazon.com
buylog delete quote --id 1

# Seed database with sample data
buylog seed

# Price alerts
buylog alert add "iPhone 15 Pro" 900      # Create alert when price drops to $900
buylog alert list                          # List all alerts
buylog alert list --triggered              # List triggered alerts only
buylog alert deactivate 1                  # Deactivate alert by ID

# Price history
buylog history --product "iPhone 15 Pro"   # View price history for a product
buylog history --quote-id 1                # View price history for a specific quote

# Price comparison
buylog compare --product "iPhone 15 Pro"   # Compare prices for a specific product
buylog compare --search "iPhone"           # Compare all products matching search term
buylog compare --category "Mobile Phones"  # Compare all products in a category
buylog compare --brand "Apple"             # Compare all products from a brand

# Product categories
buylog category set "iPhone 15 Pro" "Mobile Phones"  # Set product category
buylog category list                                  # List all categories

# Purchase lists
buylog purchase-list create "My List" --description "Weekend shopping"
buylog purchase-list add "My List" 123               # Add quote to list
buylog purchase-list remove "My List" 123            # Remove quote from list
buylog purchase-list show "My List"                  # Show list contents
buylog purchase-list all                             # List all purchase lists
buylog purchase-list delete "My List"                # Delete a list

# Quote status tracking
buylog status set 123 considering                    # Set quote status
buylog status set 123 ordered                        # Mark as ordered
buylog status set 123 received                       # Mark as received
buylog status list ordered                           # List quotes by status

# Notes
buylog note add product 1 "Great product!"           # Add note to product
buylog note add vendor 1 "Fast shipping"             # Add note to vendor
buylog note list product 1                           # List notes for product
buylog note delete 1                                 # Delete note by ID

# Tags
buylog tag add "sale" product 1                      # Tag a product
buylog tag add "priority" quote 123                  # Tag a quote
buylog tag remove "sale" product 1                   # Remove tag
buylog tag list                                      # List all tags
buylog tag list --entity-type product --entity-id 1  # List tags for entity
buylog tag search "sale"                             # Find entities by tag

# Watchlist
buylog watchlist add "iPhone 15" --target-price 800  # Add to watchlist
buylog watchlist list                                # List active watchlist
buylog watchlist list --all                          # Include inactive items
buylog watchlist update 1 --target-price 750         # Update target price
buylog watchlist remove 1                            # Remove from watchlist

# Import data
buylog import quotes data.csv                        # Import quotes from CSV
buylog import quotes data.json                       # Import quotes from JSON
buylog import quotes data.csv --no-create            # Don't create missing entities

# Export data
buylog export quotes --format csv --file quotes.csv   # Export to CSV
buylog export quotes --format markdown --file report.md  # Export to Markdown
buylog export quotes --filter "iPhone"               # Export filtered quotes
buylog export products --file products.csv           # Export products
buylog export vendors --file vendors.csv             # Export vendors

# Backup and restore
buylog backup                                        # Create timestamped backup
buylog backup --output my-backup.db                  # Custom backup path
buylog restore my-backup.db                          # Restore from backup
buylog restore my-backup.db --no-backup              # Restore without backing up current
buylog backups                                       # List available backups

# Find and merge duplicates
buylog duplicates vendors                            # Find similar vendors
buylog duplicates vendors --threshold 0.7            # Custom similarity threshold
buylog duplicates products                           # Find similar products
buylog duplicates merge-vendors 1 2 3                # Merge vendors 2,3 into vendor 1
buylog duplicates merge-products 1 2 3               # Merge products 2,3 into product 1

# Clipboard support
buylog clipboard quote 123                           # Copy quote to clipboard
buylog clipboard product "iPhone 15 Pro"             # Copy product to clipboard
buylog clipboard vendor "Amazon US"                  # Copy vendor to clipboard

# Vendor URL management
buylog vendor-url set "Amazon US" "https://amazon.com"  # Set vendor URL
buylog vendor-url open "Amazon US"                   # Open vendor URL in browser
buylog vendor-url clear "Amazon US"                  # Clear vendor URL

# Receipt attachments
buylog receipt attach 123 receipt.pdf                # Attach receipt to quote
buylog receipt open 123                              # Open attached receipt
buylog receipt detach 123                            # Remove receipt from quote
buylog receipt list                                  # List quotes with receipts

# Web scraping
buylog scrape url "https://example.com/product"      # Scrape price from URL
buylog scrape quote "https://example.com/product" --vendor "Amazon US" --product "iPhone 15"  # Create quote from URL

# HTML reports
buylog report price-comparison                       # Compare prices across vendors
buylog report price-comparison --filter "iPhone"     # Filter by product name
buylog report price-comparison --output report.html  # Save to file
buylog report purchase-summary --output summary.html # Summary by status
buylog report vendor-analysis --output vendors.html  # Vendor statistics

Text User Interface (TUI)

Launch the interactive TUI:

buylog tui

The TUI provides:

• Tabbed interface for Brands, Products, Vendors, Quotes, Forex rates, Alerts, Lists, and Watchlist
• DataTables with row selection
• Modal forms for adding entities
• Search/filter functionality
• Quote Analysis Features:
  • Best prices highlighted in green
  • Total cost calculation (with discount, shipping, tax)
  • Price trend indicators (^ up, v down, - stable, * new)
  • Sparkline mini-graphs showing price history
  • Triggered alerts highlighted in yellow
  • Status column with color coding (considering=cyan, ordered=yellow, received=green)
• Workflow Features:
  • Lists tab - View and manage purchase lists
  • Watchlist tab - Monitor products with target prices
  • Set quote status with t key
  • Add to watchlist with w key
• Integration Features:
  • URL column in Vendors tab showing link indicators
  • Copy to clipboard with y key (quotes, products, vendors)
  • Open vendor URL with o key (on Vendors tab)
• Quick Filters for quotes by vendor, brand, or price range
• Inline Editing - Edit entities directly with e key
• Column Sorting - Click headers or press number keys to sort
• Price Comparison - Compare prices with c key (select type: Product/Search/Category/Brand)
• Keyboard shortcuts:
  • q - Quit
  • a - Add new entity
  • c - Compare prices
  • d - Delete selected entity
  • e - Edit selected entity
  • f - Filter quotes
  • o - Open vendor URL (vendors tab)
  • r - Refresh data
  • s or / - Focus search
  • t - Set quote status
  • w - Add to watchlist
  • y - Copy to clipboard
  • Ctrl+1-8 - Switch tabs directly
  • h/l - Previous/next tab (vim-style)
  • j/k - Move cursor down/up (vim-style)
  • 1-7 - Sort by column number

Development

Running Tests

# Run all tests
make test
# or
uv run pytest

# Run with coverage report
make coverage
# or
uv run pytest --cov-report=html:cov_html --cov-report=term-missing --cov=buylog

Generate ER Diagram

make diagram
# or
uv run python src/buylog/models.py

# Output: doc/er_model.svg

Clean Build Artifacts

make clean

Architecture

Project Structure

buylog/
├── src/buylog/          # Main package
│   ├── models.py        # SQLAlchemy ORM models
│   ├── cli.py           # CLI interface
│   ├── tui.py           # Textual TUI interface
│   ├── services.py      # Business logic layer
│   ├── config.py        # Configuration management
│   ├── audit.py         # Audit logging
│   └── cache.py         # Caching utilities
├── tests/               # Test suite
│   ├── conftest.py      # pytest fixtures
│   ├── factories.py     # Factory Boy test data
│   ├── test_models.py   # Model tests
│   ├── test_services.py # Service layer tests
│   └── test_quote_analysis.py # Quote analysis feature tests
├── doc/                 # Documentation
│   └── er_model.svg     # Auto-generated ER diagram
└── pyproject.toml       # Project dependencies

Data Model

The core domain models:

• Vendor - Selling entities with currency, discount codes, and brand relationships
• Brand - Manufacturing entities linked to products and vendors
• Product - Items with brand associations that can be quoted by vendors
• Quote - Price quotes from vendors with shipping, tax, status, and total cost calculation
• QuoteHistory - Price change tracking for quotes (create/update events)
• PriceAlert - Price threshold alerts for products
• Forex - Currency exchange rates for multi-currency support
• PurchaseList - Named shopping lists grouping quotes
• Note - Freeform notes attachable to any entity (polymorphic)
• Tag - Categorization tags with optional color
• EntityTag - Junction table for tagging any entity
• Watchlist - Product monitoring with target prices

Key relationships:

• Many-to-many between Vendors and Brands (via vendor_brand junction table)
• One-to-many from Brand to Products
• One-to-many from Vendor and Product to Quotes
• One-to-many from Quote to QuoteHistory
• One-to-many from Product to PriceAlert
• Many-to-many between PurchaseList and Quotes (via purchase_list_quote junction table)
• One-to-many from Product to Watchlist

See the auto-generated ER diagram: doc/er_model.svg

Service Layer

Business logic is separated into service classes:

• BrandService - Brand CRUD with validation
• ProductService - Product management with eager loading
• VendorService - Vendor operations
• QuoteService - Quote management with currency conversion, best price detection, price updates, and status tracking
• QuoteHistoryService - Price history tracking and trend computation
• PriceAlertService - Price alert creation, triggering, and management
• ComparisonService - Price comparison by product, search, category, or brand
• PurchaseListService - Purchase list CRUD, add/remove quotes
• NoteService - Note CRUD for any entity type
• TagService - Tag management and entity tagging
• WatchlistService - Watchlist management with target prices
• ReportService - HTML report generation (price comparison, purchase summary, vendor analysis)
• AuditService - Entity change tracking

Technologies

• Python 3.13+ - Core language
• SQLAlchemy 2.0+ - ORM and database abstraction
• Textual - Modern terminal UI framework
• pytest - Testing framework
• Factory Boy - Test data generation
• uv - Fast Python package manager
• eralchemy - ER diagram generation
• tabulate - CLI table formatting

Configuration

The application uses a configuration system via config.py:

• Database path: ~/.buylog/buylog.db (configurable via BUYER_DB_PATH)
• Log level: INFO by default (configurable via BUYER_LOG_LEVEL)
• Logging: Configured for both file and console output

License

MIT

Contributing

Feedback, bug reports and code contributions are welcome!