#!/bin/sh
# Build the site into public/ and pack it as site.tar.gz: each page in
# src/ has its `<!-- include header -->` and `<!-- include footer -->`
# lines replaced by partials/header.html and partials/footer.html;
# everything else in src/ is copied as it is. Plain sh, awk and tar, so
# it runs in any image (and on the VisionFive 2 Lite) with nothing to
# install.
set -eu
cd "$(dirname "$0")/.."
rm -rf public
mkdir -p public
(cd src && find . -type f) | while read -r f; do
    mkdir -p "public/$(dirname "$f")"
    case "$f" in
        *.html)
            awk '
                /<!-- include header -->/ { while ((getline l < "partials/header.html") > 0) print l; close("partials/header.html"); next }
                /<!-- include footer -->/ { while ((getline l < "partials/footer.html") > 0) print l; close("partials/footer.html"); next }
                { print }
            ' "src/$f" > "public/$f"
            if grep -q '<!-- include ' "public/$f"; then
                echo "build: $f names a partial that does not exist" >&2
                exit 1
            fi
            ;;
        *) cp "src/$f" "public/$f" ;;
    esac
done
# Nothing in the site may load from elsewhere (the footer promises it).
# Links out are fine; nothing a page loads (src=, <link href=) may be.
if grep -rniE 'src="(https?:)?//|<link[^>]*href="(https?:)?//' public --include='*.html'; then
    echo "build: a page loads a resource from another site (above)" >&2
    exit 1
fi
if grep -rniE 'url\((https?:)?//|@import' public --include='*.css'; then
    echo "build: the stylesheet loads something from another site (above)" >&2
    exit 1
fi
tar -C public -czf site.tar.gz .
echo "built $(find public -type f | wc -l) files into public/ and site.tar.gz"