The repository can build EPUB 3 editions for Simplified Chinese, Traditional Chinese (Taiwan), English, Arabic, Russian, Tamil, Vietnamese, and Japanese from the same Markdown sources used by the PDF editions. Arabic EPUBs use RTL page progression while preserving LTR layout for code and mathematics.

Install Pandoc, Poppler (pdftoppm), and optionally EPUBCheck. The builder uses each PDF's first page as the corresponding EPUB cover. When EPUBCheck is available, the builder validates every generated book.

Build every language from the repository root:

./build_epub.sh

Build one language by passing its language code:

./build_epub.sh zh-CN
./build_epub.sh zh-TW
./build_epub.sh en
./build_epub.sh ar
./build_epub.sh ru
./build_epub.sh ta
./build_epub.sh vi
./build_epub.sh ja

Note: ./build_epub.sh (no argument, i.e. all) does not yet include Japanese or Arabic while their PDF pipelines are being validated. Build them explicitly with ./build_epub.sh ja or ./build_epub.sh ar.

The builder writes each .epub beside its language's PDF. Generated EPUB files are ignored by Git.