#!/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"