Git submodules YAML config dumper : .gitmodules to .gitmodules.yml

gitmodules2yaml.bash

#!/usr/bin/env bash
set -euo pipefail

_init(){
	_gitmodules='
		[submodule "dependencies/submodules/bash"]
			path = dependencies/submodules/bash
			url = https://git.savannah.gnu.org/git/bash.git
			branch = bash-4.4
			shallow = true
		[submodule "dependencies/submodules/git"]
			path = dependencies/submodules/git
			url = https://github.com/git/git
			branch = v2.13.0
			shallow = true
		[submodule "dependencies/submodules/curl"]
			path = dependencies/submodules/curl
			url = https://github.com/curl/curl
			branch = curl-7_54_0
			shallow = true
	'
	_gitmodules=${_gitmodules//$'\t'$'\t'/}

	read -r -d '' _gitmodules2yaml <<-'EOF' || true
	#!/usr/bin/awk -f
	# Original awk by : http://www.linuxquestions.org/questions/programming-9/using-awk-to-get-blocks-of-data-from-a-text-file-4175426447/page2.html#post4784158
	BEGIN {
		RS = "\\[submodule";
		FS = "\n";
		block = 0;
		YAML_INDENT="  "
	}

	$1 ~ /"]$/ {
		sub(/"]$/,"",$1)
		sub(/ "/,"",$1)
		gsub(/'/,"''",$1)
		if(block==0){print "---\n'submodule':"}
		print YAML_INDENT"'"$1"':"
		for (i = 2; i <= NF-1; i++) {
			gsub(/'/,"''",$i)
			sub(/^(\t| )+/,"",$i)
			sub(/ = /,"': '",$i)
			print YAML_INDENT""YAML_INDENT"'"$i"'"
		}
		block++;
	}
	END {
		if(block==0) {
			print "No submodule found !" > "/dev/stderr"
			exit 2
		}
	}
	EOF
}

_main() {
	if [ -n "${1-}" ];then
		test -f "$1" || { >&2 echo "File '$1' doesn't exist or is not a regular file"; return 2; }
		test -r "$1" || { >&2 echo "The read permission is not granted on file '$1'"; return 2; }
		awk -f <(echo "$_gitmodules2yaml") $1 || { >&2 echo "An error occured with the awk parser!"; return 2; }
	else
		echo -e "\nUsage : ./gitmodules2yaml.bash .gitmodules"
		echo -e "\n--------------------------------------------"
		pr -W"150" -e8 -tm <(echo -e "\n# The .gitmodules exemple\n";echo "$_gitmodules") <(echo -e "\n# The YAML generated\n";awk -f <(echo "$_gitmodules2yaml") <(echo -ne "$_gitmodules")) || { >&2 echo "Error during the paste of the .gitmodulesexemple and the yaml result"; return 2; }
		exit 1
	fi
}

_init
_main "$@"

exit 0