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Benedikt Willi fab66d1528 Implement Jinja2 templates for startpage and error pages 
Features:
- Add Jinja2 template engine for page rendering
- Create startpage with Bowser branding and version info
- Create error page templates for 404, 500, and network errors
- Support for about:startpage special URL
- Custom error message support in templates
- Graceful fallback rendering if template fails
- Browser now starts with startpage when no URL provided

Templates:
- assets/pages/startpage.html - Beautiful purple gradient intro page
- assets/pages/error_404.html - Pink gradient 404 error page
- assets/pages/error_500.html - Red gradient 500 error page
- assets/pages/error_network.html - Orange gradient network error page

Code:
- src/templates.py - Template rendering utilities with Jinja2
- Updated main.py to use startpage as default
- Updated Frame.load() to handle about: URLs and render errors with templates
- Added 7 comprehensive template tests

All 62 core tests passing (excluding GTK-dependent tests)
2026-01-09 14:24:01 +01:00
.github/prompts Initial bowser project scaffold 2026-01-09 12:20:46 +01:00
assets Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00
src Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00
tests Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00
.gitignore Add comprehensive test suite with pytest 2026-01-09 13:37:21 +01:00
main.py Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00
pyproject.toml Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00
README.md Add comprehensive test suite with pytest 2026-01-09 13:37:21 +01:00
uv.lock Implement Jinja2 templates for startpage and error pages 2026-01-09 14:24:01 +01:00

README.md

Bowser — Educational Web Browser

A custom web browser built from scratch following the browser.engineering curriculum.

Status: Early scaffolding phase (M0)

Building

Prerequisites

  • Python 3.11+
  • GTK 4 development libraries (Debian: libgtk-4-dev libgtk-4-1)
  • Skia-Python (skia-python): pip install skia-python
  • PyGObject (PyGObject): pip install PyGObject

Setup

uv sync
uv run bowser

Testing

Run the test suite:

# Install dev dependencies
uv sync --extra dev

# Run all tests
uv run pytest

# Run with verbose output
uv run pytest -v

# Run with coverage report
uv run pytest --cov=src --cov-report=html

# Run specific test file
uv run pytest tests/test_browser.py

Development

# Format code
uv run black src tests

# Lint code
uv run ruff check src tests

# Type check
uv run mypy src

Project Structure

bowser/
├── src/
│   ├── network/          # URL parsing, HTTP, cookies
│   ├── parser/           # HTML & CSS parsers
│   ├── layout/           # Block/inline/embedded layout
│   ├── render/           # Paint commands, fonts, compositing
│   ├── script/           # JavaScript integration
│   ├── browser/          # Tab/frame/chrome orchestration
│   └── accessibility/    # A11y tree and screen reader
├── assets/               # Stylesheets, images
├── tests/                # Unit tests
├── pyproject.toml        # Dependencies & build config
└── main.py               # Entry point

Development Milestones

  • M0: Project scaffold ✅
  • M1: Display "Hello World" in GTK window with manual URL fetch & paint
  • M2: Render plain HTML with text wrapping
  • M3: Parse and apply basic CSS
  • M4: Clickable links and navigation
  • M5: Form input and submission
  • M6: JavaScript execution (embed QuickJS)
  • M7: Event handling
  • M8: Images and iframes
  • M9: Animations and visual effects
  • M10: Accessibility and keyboard navigation

References