#!/bin/bash
#
# Build a flat aggregate of every language's PDF under docs/build/html/pdf/
# (hardlinks, cheap and idempotent) plus an index listing.  The PDFs
# themselves live in the per-language trees docs/build/html/<lang>/pdf/; this
# flat folder keeps the legacy /pdf/ URL working with all languages side by
# side.
#

set -e

# Assume we're running in src/, we can't call `git rev-parse
# --show-toplevel` because when building from dsc we don't have a
# git repo.
TOPLEVEL=${PWD}/..
HTML="${TOPLEVEL}/docs/build/html"
DEST="${HTML}/pdf"
mkdir -p "${DEST}"

# Hardlink every per-language PDF into the flat folder.  Names already carry a
# _<lang> suffix so there are no collisions.  mindepth 3 skips DEST itself
# (docs/build/html/pdf/*.pdf is only two levels below html/).
find "${HTML}" -mindepth 3 -path '*/pdf/*.pdf' -print0 \
    | while IFS= read -r -d '' F; do
        ln -f "${F}" "${DEST}/$(basename "${F}")"
    done

TITLE="LinuxCNC PDF docs ($(cat "${TOPLEVEL}"/VERSION))"
PDF_INDEX="${DEST}/index.html"
rm -f "${PDF_INDEX}"

{
    echo "<html>"
    echo "<head><title>${TITLE}</title></head>"
    echo "<body><h1>${TITLE}</h1><p>"
    for F in $(cd "${DEST}" && find . -maxdepth 1 -name '*.pdf' | sort); do
        echo "    <a href=\"${F#./}\">${F#./}</a><br>"
    done
    echo "</body>"
    echo "</html>"
} >> "${PDF_INDEX}"