Updates the metadata of all svgs in a folder to sensible defaults if empty, doesn't change the field if not

freecad_metadata.sh

#!/bin/bash

# Loops through all svg files in a directory
# Fields with an existing value are left alone
# Empty fields are filled with sensible defaults
# Licensing or Rights information is flagged for manual review

for file in *.svg
	do
		me="[agryson] Alexander Gryson"
		file_w_type=$(basename "$file")
		filename="${file_w_type%.*}"
		filelocation=$(readlink -f $file)
		IFS='F' read -ra PATHS <<< "$filelocation"			
		firstcommitdate=$(git log --diff-filter=A --date=short --format='%ad' $file_w_type)
		filelocation='F'${PATHS[1]}
		committer=$(git log --diff-filter=A --format='[%an]' $file_w_type)

		echo ">"$file
		#__CREATOR
		creator_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:creator/cc:Agent/dc:title" $file)
		if [[ ! $creator_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:creator $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:creator" -t elem -n cc:Agent $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:creator/cc:Agent" -t elem -n dc:title -v $committer $file
		fi

		#__Title
		title_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:title" $file)
		if [[ ! $title_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:title -v $filename $file
		fi

		#__Creation_Date
		creationDate_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:date" $file)
		if [[ ! $creationDate_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:date -v $firstcommitdate $file
		fi

		#__Relation
		relation_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:relation" $file)
		relation_url="http://www.freecadweb.org/wiki/index.php?title=Artwork"
		if [[ ! $relation_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:relation -v $relation_url $file
		fi

		#__Publisher
		publisher_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:publisher/cc:Agent/dc:title" $file)
		if [[ ! $publisher_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:publisher $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:publisher" -t elem -n cc:Agent $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:publisher/cc:Agent" -t elem -n dc:title -v "FreeCAD" $file
		fi

		#__Identifer
		identifier_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:identifier" $file)
		if [[ ! $identifier_m ]]; then
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:identifier -v $filelocation $file
		fi

		#__Rights
		rights_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:rights/cc:Agent/dc:title" $file)
		if [[ $rights_m ]]; then
			echo ""
			echo "*** RIGHTS EXIST: "$rights_m" : " $file
			echo ""
		else
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:rights $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:rights" -t elem -n cc:Agent $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:rights/cc:Agent" -t elem -n dc:title -v "FreeCAD LGPL2+" $file
		fi

		#__License
		license_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/cc:license" $file)
		license_tango=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -c "//ns:metadata/rdf:RDF/cc:License" $file)
		if [[ $license_m ]]; then
			echo ""			
			echo "*** LICENSE EXISTS, NOT OVERWRITING: "$file
			echo ""
			/usr/bin/inkscape $file
		elif [[ $license_tango ]]; then
			echo ""			
			echo "*** LICENSE EXISTS, NOT OVERWRITING: "$file
			echo ""
			/usr/bin/inkscape $file
		else
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n cc:license -v "https://www.gnu.org/copyleft/lesser.html" $file
		fi

		#__Contributor
		contributor_m=$(xmlstarlet sel -N ns="http://www.w3.org/2000/svg" -t -v "//ns:metadata/rdf:RDF/cc:Work/dc:contributor/cc:Agent/dc:title" $file)
		if [[ $contributor_m ]]; then
			newContrib=$contributor_m", "$me
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -u "//ns:metadata/rdf:RDF/cc:Work/dc:contributor/cc:Agent/dc:title" -v "$newContrib" $file
		else
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work" -t elem -n dc:contributor $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:contributor" -t elem -n cc:Agent $file
			xmlstarlet ed -L -N ns="http://www.w3.org/2000/svg" -s "//ns:metadata/rdf:RDF/cc:Work/dc:contributor/cc:Agent" -t elem -n dc:title -v "$me" $file
		fi
	done