get_version.sh
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	#!/usr/bin/env bash
	#get_version.sh
	# Get version of R packages used in R scripts

	################
	# Main
	################
	main(){
	local funcname
	funcname='main'

	local fps
	fps=($(cd .. && git ls-files '*.R' \| sed 's/^/..\//g'))

	# Get packages hard-coded in R scripts
	grep -hE "(require\|library)$[a-zA-Z0-9\']*$" "${fps[@]}" \| \
	sed '/^[[:space:]]*#/d' \| \
	sed -r "s/.(require\|library)$([a-zA-Z0-9\'])$.*/\2/" \| \
	sed "s/[\']*//g" \| \
	sort -u

	return 0
	}

	set -o nounset
	set -o pipefail

	main "${@}"

	exit 0