#!/usr/bin/env bash

shopt -s globstar

while true ; do
	case $1 in
		-h|--help)
			echo "Usage: $(basename "$0") [OPTIONS] FILE [PATH]"
			echo
			echo "Clone all repositories from lst (FILE)."
			echo
			echo "Options:"
			echo "    -h --help       - print this message and exit"
			echo "    -o              - print repos and exit"
			echo "    -r              - print repos recursively and exit"
			echo
			echo "Repository list can be constructed from an existing set of"
			echo "repositories via:"
			echo "  $ git listall -o > reposiotry.lst"
			echo "or recursively:"
			echo "  $ git listall -r > reposiotry.lst"
			echo "If a repository list already exists it can be expanded via:"
			echo "  $ git listall -r reposiotry.lst >> reposiotry.lst"
			echo
			echo "The repository list is a text file with each line consisting"
			echo "of a \"=\"-separated path and a remote url (as supported by"
			echo "git clone)."
			echo "Lines starting with \"-\" will not get cloned"
			echo "The list file can also contain empty lines and supports shell"
			echo "comments (lines starting with \"#\")"
			echo "Example:"
			echo "  # comment..."
			echo "  ./path/to/repo=git@example.com:user/repo.git"
			echo "  # disabled repo..."
			echo "  -./path/to/repo=git@example.com:user/repo.git"
			echo
			exit
			;;

		# list...
		-o)
			LIST_REPOS=1
			shift
			continue
			;;
		-r)
			RECURSIVE=1
			shift
			continue
			;;

		-*|--*)
			echo "Error: unknown option: \"$1\"" >&2
			exit
			;;
		*)
			LIST=$1
			TARGET_PATH=$2
			break
			;;
	esac
done


# list...
#

if ! [ -z $LIST_REPOS ] || ! [ -z $RECURSIVE ] ; then
	if ! [ -z $RECURSIVE ] ; then
		REPOS=(./**/.git/config)
	else
		REPOS=(./*/.git/config)
	fi

	# format and print unique lines...
	lines=()
	{
		for p in "${REPOS[@]}" ; do
			path=${p/.git\/config/}
			remote=$(cat "$p" \
				| sed -n '/\[remote "origin"\]/,/^\s*url/p' \
				| grep 'url = ' \
				| sed \
					-e 's/\s*url\s*=\s*//')
			[ -z $remote ] \
				&& continue
			line="$path=$remote"
			lines+=($line)
			echo $line
		done
		if [ -e "$LIST" ] ; then
			cat "$LIST" \
				| grep -ve '\(^\s*#\|^\s*$\)' \
				| sed -e 's/^-//'
		fi
	} \
		| sort \
		| uniq -u

	exit
fi


# clone...
#

TARGET_PATH=${TARGET_PATH:=.}
cd "$TARGET_PATH"

if [ -z $LIST ] ; then
	echo "need a list file..." >&2
	exit 1
fi

IFS=$'\n' \
	LIST=($(cat "$LIST"))

wd=`pwd`
for repo in ${LIST[@]} ; do
	repo=`xargs<<<"${repo}"`
	# skip comments and empty lines...
	if [ -z "$repo" ] || [[ "${repo}" =~ ^# ]] ; then
		continue
	fi

	# skip lines startig with "-"...
	if [[ "${repo:0:1}" == "-" ]] ; then
		continue
	fi

	IFS=$'=' \
		repo=($repo)

	# skip existing dirs or local repos...
	if [ -e "${repo[0]}" ] || [ "${repo[1]}" = "origin" ] ; then
		#echo "skipping: ${repo[0]}"
		continue
	fi

	mkdir -p "${repo[0]}"

	git clone ${repo[1]} "${repo[0]}"

	cd "$wd"
done




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