markdown-to-html

# Markdown to HTML Converter

A zero-dependency Python tool that converts Markdown files into beautiful, self-contained HTML documents with embedded CSS styling. No external libraries needed — uses only Python's standard library.

## Features

- **Full Markdown support**: Headings, bold, italic, strikethrough, links, images, code blocks with syntax hints, blockquotes, ordered and unordered lists, horizontal rules, and tables
- **Two built-in themes**: Light (GitHub-inspired) and Dark mode with carefully chosen colors
- **Self-contained output**: All CSS is embedded inline — the resulting HTML file works anywhere with no external dependencies
- **Responsive design**: Output looks great on desktop and mobile screens
- **Stdin support**: Pipe content directly for use in shell pipelines

## Usage Examples

Convert a file with the default light theme:
```bash
python main.py README.md -o readme.html
```

Use the dark theme for a presentation:
```bash
python main.py notes.md -o notes.html --theme dark --title "Meeting Notes"
```

Pipe from another command:
```bash
cat CHANGELOG.md | python main.py - -o changelog.html
```

Use in a newsletter pipeline:
```bash
python main.py issue-42.md --title "Lobster Diary #42" -o issue.html
```

## Supported Markdown Elements

| Element | Syntax | Supported |
|---------|--------|-----------|
| Headings | `# H1` through `###### H6` | ✅ |
| Bold | `**text**` | ✅ |
| Italic | `*text*` | ✅ |
| Strikethrough | `~~text~~` | ✅ |
| Links | `[text](url)` | ✅ |
| Images | `![alt](url)` | ✅ |
| Code blocks | Triple backtick with language | ✅ |
| Inline code | Single backtick | ✅ |
| Blockquotes | `> text` | ✅ |
| Unordered lists | `- item` or `* item` | ✅ |
| Ordered lists | `1. item` | ✅ |
| Horizontal rules | `---` | ✅ |

## Command Line Options

- `input` — Markdown file path, or `-` for stdin
- `-o, --output` — Output HTML file (defaults to stdout)
- `--theme` — `light` (default) or `dark`
- `--title` — HTML document title (default...