#!/bin/sh
set -eu


usage() {
	cat <<-'EOF'
		Usage:
		  conf FILENAME
		  conf -h
	EOF
}

help() {
	cat <<-'EOF'

		Options:
		  -h, --help    show this message

		  FILENAME      the name of the input file, also to be used as
		                URL.


		Separate the content from the "frontmatter", and emit the
		selected one, given the FILENAME.


		Examples:

		  Get the "frontmatter" of src/f.conf:

		    $ conf src/f.md > src/f.conf
	EOF
}


for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

while getopts 'h' flag; do
	case "$flag" in
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

. src/lib.sh

FILENAME="${1:-}"
eval "$(assert_arg "$FILENAME" 'FILENAME')"


shesc() {
	sed 's|\([`"$]\)|\\\1|g'
}

tee "$FILENAME".tmp < src/lib/base.conf
DELIMITER=0
while read -r line; do
	if [ "$line" = '---' ]; then
		DELIMITER=$((DELIMITER + 1))
		continue
	fi
	if [ "$DELIMITER" = 2 ]; then
		break
	fi
	if [ -z "$line" ]; then
		continue
	fi

	KEY="$(  printf '%s' "$line" | cut -d: -f1)"
	VALUE="$(printf '%s' "$line" | cut -d: -f2- | sed 's|^ ||' | shesc)"
	printf 'export %s="%s"\n' "$KEY" "$VALUE"
done < "$FILENAME" | tee -a "$FILENAME".tmp
# shellcheck source=/dev/null
. "$FILENAME".tmp
rm -f "$FILENAME".tmp


lang="$(lang-for "$FILENAME")"
export lang
printf 'export lang="%s"\n' "$lang"

cat src/lib/base."${lang:?}".conf
# shellcheck source=/dev/null
. src/lib/base."$lang".conf
if [ -z "${title:-}" ]; then
	title="${site_name:?}"
	printf 'export title="%s"\n' "$(printf '%s' "$title" | shesc)"
fi

if [ -n "${date:-}" ]; then
	date_iso="$(date -ud "${date:?}" -Is)"
	printf 'export date_iso="%s"\n' "$date_iso"

	formatted_date="$(LANG="$lang" date -ud "${date:?}" +"${date_fmt:?}")"
	export formatted_date
	printf 'export date_html="%s"\n' "$(envsubst < src/lib/date."$lang".html | shesc)"

	echo "${FILENAME%.md}.xmlentry" > "$(dirname "$FILENAME")/$date_iso.sortdata"
	touch "${FILENAME%.md}.sortref"
fi

if [ -n "${update:-}" ]; then
	update_iso="$(date -ud "${update:?}" -Is)"
	printf 'export update_iso="%s"\n' "$update_iso"

	formatted_update="$(LANG="$lang" date -ud "${update:?}" +"${date_fmt:?}")"
	export formatted_update
	printf 'export update_html="%s"\n' "$(envsubst < src/lib/update."$lang".html | shesc)"

	printf 'export update_xml="    <updated>%s</updated>"\n' "$update_iso"
fi


url_part="$(printf '%s' "${FILENAME%.md}.html" | sed "s|^$CONTENT_PREFIX||")"
title_uri="$(uri "$title")"

printf 'export title_html="%s"\n' "$(printf '%s' "$title" | htmlesc | shesc)"
printf 'export filename="%s"\n' "$FILENAME"
printf 'export url_part="%s"\n' "$url_part"
printf 'export url="%s"\n' "$(url-for "$url_part" | absolute)"
printf 'export mailto_uri="%s%s"\n' "${mailto_uri_prefix:?}" "$title_uri"
printf 'export discussions_url="%s%s"\n' "${discussions_url_prefix:?}" "$title_uri"
printf 'export sourcecode_url="%s%s"\n' "${sourcecode_url_prefix:?}" "$FILENAME"

printf 'export style_url="%s"\n'   "$(url-for 'style.css')"
printf 'export favicon_url="%s"\n' "$(url-for 'favicon.svg')"
printf 'export pubkey_url="%s"\n'  "$(url-for 'public.asc.txt')"

for f in "$CONTENT_PREFIX"/img/*.svg; do
	name="$(basename "$f" .svg | sed 's|-|_|g')"
	printf 'export icon_%s_url="%s"\n' "$name" "$(url-for "img/$(basename "$f")")"
done

# FIXME: special treatment of root
printf 'export homepage_url="%s"\n' "$(url-for '/')"

printf 'export about_url="%s"\n' "$(url-for "${about_url_name:?}")"


if [ "${layout:-}" = 'post' ]; then
	export mailto_uri="$mailto_uri_prefix$title_uri"
	export discussions_url="$discussions_url_prefix$title_uri"
	export sourcecode_url="$sourcecode_url_prefix$FILENAME"
	printf 'export comment_html="%s"\n' "$(envsubst < src/lib/comment."$lang".html | shesc)"
fi