book.bat

@echo off
@pushd "%~dp0"
rem PDF render only. Run build.bat first so docs\_site-pdf\book.html and
rem its dependencies exist.
rem
rem render-book.mjs drives puppeteer + paged.js + pdf-lib directly so
rem we control pdf-lib's parseSpeed (the default yields the event loop
rem between every 100 objects on load, adding ~32 s to a 100 s build
rem for no reason in Node -- see perf\README.md "Profiling pdf-lib's
rem load" for the full diagnosis). pagedjs-cli passed no options to
rem load/save and inherited that cost; we don't.
rem
rem --additional-script perf\detach-pages.js injects a Paged.Handler
rem that hides each finalised page from Chromium's layout tree and
rem restores them all before page.pdf() runs. Drops total render from
rem ~104s to ~51s on the 1638-page book by eliminating the O(n^2)
rem getBoundingClientRect cost in paged.js's overflow walker.
if not exist docs\_site-pdf\book.html (
    echo docs\_site-pdf\book.html not found. Run build.bat first.
    exit /b 1
)
if not exist node_modules\puppeteer\package.json (
    echo Installing dependencies...
    call npm install
    if errorlevel 1 exit /b 1
)
if not exist docs\_pdf mkdir docs\_pdf
node book\render-book.mjs docs\_site-pdf\book.html -o "docs\_pdf\twinBASIC Book.pdf" --outline-tags h1,h2,h3,h4 --additional-script perf\detach-pages.js
@popd