# HG changeset patch
# User František Kučera <franta-hg@frantovo.cz>
# Date 1637524406 -3600
# Node ID fd47709ed17c4ef4ac03da280d6626125f79b28d
# Parent  917b8fbd29b9f8e7ee7dd18b0b6971326acaee52
examples: generic script for converting alternative formats (INI, MIME, YAML, JSON, ASN.1 etc.) to XML

diff -r 917b8fbd29b9 -r fd47709ed17c examples/2xml.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/2xml.sh	Sun Nov 21 20:53:26 2021 +0100
@@ -0,0 +1,69 @@
+#!/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