#!/bin/bash

# Relational pipes

# Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, version 3 of the License.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program. If not, see <http://www.gnu.org/licenses/>.

# This script reads data in an alternative format (INI, MIME, YAML etc.)

# and converts it to XML using a relpipe-in-*table command.

# 

# This script should not be called directly.

# Rather create a symlink like ini2xml for particular formats.

# The input format is determined by the symlink name.

# 

# Optional features:

#  - XML indentation: needs the xmllint command

#  - XML syntax highlighting: needs the pygmentize command

set -o pipefail

indentXML() {

	if type "xmllint" &> /dev/null; then

		xmllint --format -

	else

		cat

	fi

}

colorizeXML() {

	if [ ! -t 1 ]; then

		cat

	elif type "pygmentize" &> /dev/null; then

		pygmentize -l xml

	else

		# echo "Missing optional command „pygmentize“ needed for XML syntax highlighting." 1>&2

		cat

	fi

}

baseName=$(basename "$0");

if [[ "$baseName" =~ ^(.+)2xml$ ]]; then

	inputFormat=${BASH_REMATCH[1]};

	relpipeCommand="relpipe-in-${inputFormat}table";

	if type "$relpipeCommand" &> /dev/null; then

		"$relpipeCommand" \

			"${@}" \

			--relation "2xml" \

				--records "/" \

				--attribute "xml" string "." --mode raw-xml \

			| relpipe-out-nullbyte | tr -d \\0 | indentXML | colorizeXML

	else

		echo "Unable to find „$relpipeCommand“ command needed for conversion of „$inputFormat“ format to XML.";

	fi

else

	echo "Usage: Do not use this script directly. Create a symling (e.g. ini2xml) to this file.";

fi