Converts the System Programming wiki markdown files into a single PDF or EPUB book, ordered by the course table of contents.

• Python 3.6+
• Pandoc (tested with 3.6+)
• For PDF output: xelatex (install texlive-xetex and related font packages)

# Generate PDF
python3 build_book.py --pdf

# Generate EPUB
python3 build_book.py --epub

# Generate both
python3 build_book.py --pdf --epub

Output files are written to the current directory as SystemProgramming.pdf and/or SystemProgramming.epub.

1. Concatenates all wiki markdown files in table-of-contents order (12 chapters)
2. Cleans up wiki-style links, HTML tags, broken remote images, and invalid characters
3. Structures headings into a chapter/section hierarchy
4. Generates a table of contents
5. For PDF: applies LaTeX-specific escaping and page breaks via xelatex
6. For EPUB: produces a clean EPUB3 with chapter-level splitting