Convert project folders to git submodules

folder2submodule.sh

#!/bin/sh

# Convert project folders to git submodules
# Usage:
#
#	folder2submodule.sh <main project folder> <remote repository name> <access token> <subfolder1> <subfolder12> ...
#

typeset var prj=$1	# Project folder
typeset var rmt=$2	# Origin remote repository
typeset var tok=$3	# Github access token for remote repository creation
shift 3

if [ ! -d "$prj" ]
then
	echo "Repository folder does not exist"
	exit 1
fi

if [ ! -s "$prj/.git" ]
then
	echo "Folder is not under git"
	exit 1
fi

for fld in $*
do
	if [ ! -d "$prj/$fld" ]
	then
		echo "Folder '$prj/$fld' not found..."
		continue
	fi

	if [ -s "$prj/$fld/.git" ]
	then
		echo "Folder '$prj/$fld' is already a submodule"
		continue
	fi

	typeset var new=$(basename $fld)
	typeset var tmp="tmp_$new"

	echo "Cleanup"
	rm -rf $tmp

	echo "Clone new repositories into $tmp"
	git clone --no-hardlinks "$prj" "$tmp"

	echo "Filter out the files in $new"

	cd "$tmp"
		echo "Filter out the files in $new"
		git filter-branch --subdirectory-filter "$fld" HEAD -- --all
		git reset --hard
		git gc --aggressive
		git prune

		echo "Init variables"
		typeset var org=$(git remote -v | grep $rmt | sort -k1,1 -u)
		typeset var pos=$(echo $org | tr '/' '\n' | wc -l)
		typeset var usr=$(echo $org | cut -d'/' -f1-$(expr $pos - 1) | tr '/:' '\n' | tail -1)
		typeset var rep=$(echo $org | cut -d'/' -f1-$(expr $pos - 1))/$new.git

		if [ -n "$tok" ]
		then
			if curl https://api.github.com/user/repos?access_token=$tok -d "{\"name\":\"$new\"}"
			then
				echo "Remote repository created"
			else
				echo "Cannot create remote repository"
				exit 3
			fi
		fi

		echo "Change remote repository"
		git remote rm $rmt
		git remote add $rep
		git branch master
		git push -u $rmt master

	cd -

	echo "Add the new repository as submodules to the original repository"

	cd "$prj"
		git rm -r "$fld"
		git commit -m "[Rmv] folder '$fld' (now in repository '$rep')"
		git submodule add $rep $fld
		git submodule init
		git submodule update
		git add .gitmodules
		git commit -m "[Add] submodule '$fld' (from repository '$rep')"
		git push
	cd -
done