#!/bin/sh
set -eu
. src/development/lib.sh

usage() {
	cat <<-'EOF'
		Usage:
		  frontmatter-env.sh < STDIN
		  frontmatter-env.sh -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -h, --help


		Examples:

		  FIXME:

		    $ FIXME
	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))

DELIM="$(uuid)"
awk -vDELIM="$DELIM" -vQUOTE="'" -F: '
	BEGIN {
		separator = 0
	}

	/^---$/ {
		separator++
		if (separator > 1) {
			exit
		} else {
			next
		}
	}

	/^$/ { next }

	{
		printf "%s=\"$(\n\tcat <<-%s%s%s\n\t\t", $1, QUOTE, DELIM, QUOTE
		base_index = 1
		offset = base_index + length($1) + length(": ")

		# printf "\t%s\n", substr($0, offset + quote, length($0) - offset - quote)
		# JEKYLL_COMPAT: quoted titles because of the frontmatter
		if ($3 != "") {
			quote = length("\"")
			printf "%s", substr($0, offset + quote, length($0) - offset - quote)
		} else {
			printf "%s", substr($0, offset)
		}
		printf "\n\t%s\n)\"\n\n", DELIM
	}
'