File used to split YSI in to multiple repos with full history. I actually split it up and ran it in 10 parallel versions.

all.sh

declare -a arr=(
	"YSI-Coding/y_functional",
	"YSI-Coding/y_hooks",
	"YSI-Coding/y_inline",
	"YSI-Coding/y_malloc",
	"YSI-Coding/y_remote",
	"YSI-Coding/y_stringhash",
	"YSI-Coding/y_timers",
	"YSI-Coding/y_unique",
	"YSI-Coding/y_va",
	"YSI-Core/y_als",
	"YSI-Core/y_cell",
	"YSI-Core/y_debug",
	"YSI-Core/y_master",
	"YSI-Core/y_profiling",
	"YSI-Core/y_testing",
	"YSI-Core/y_utils",
	"YSI-Data/y_bintree",
	"YSI-Data/y_bit",
	"YSI-Data/y_foreach",
	"YSI-Data/y_hashmap",
	"YSI-Data/y_iterate",
	"YSI-Data/y_jaggedarray",
	"YSI-Data/y_playerarray",
	"YSI-Data/y_playerset",
	"YSI-Data/y_sortedarray",
	"YSI-Data/y_sparsearray",
	"YSI-Extra/y_extra",
	"YSI-Extra/y_files",
	"YSI-Extra/y_streamer_plugin",
	"YSI-Game/y_vehicledata",
	"YSI-Players/y_groups",
	"YSI-Players/y_languages",
	"YSI-Players/y_text",
	"YSI-Players/y_users",
	"YSI-Server/y_colors",
	"YSI-Server/y_colours",
	"YSI-Server/y_flooding",
	"YSI-Server/y_lock",
	"YSI-Server/y_punycode",
	"YSI-Server/y_scriptinit",
	"YSI-Server/y_stringise",
	"YSI-Server/y_stringize",
	"YSI-Server/y_td",
	"YSI-Storage/y_amx",
	"YSI-Storage/y_bitmap",
	"YSI-Storage/y_ini",
	"YSI-Storage/y_php",
	"YSI-Storage/y_svar",
	"YSI-Storage/y_uvar",
	"YSI-Storage/y_xml",
	"YSI-Visual/y_areas",
	"YSI-Visual/y_classes",
	"YSI-Visual/y_commands",
	"YSI-Visual/y_dialog",
	"YSI-Visual/y_loader",
	"YSI-Visual/y_properties",
	"YSI-Visual/y_races",
	"YSI-Visual/y_zonenames",
	"YSI-Visual/y_zonepulse"
)

do_rm() {
	IFS='.' read -ra p <<< "$3"

	if [[ "${p[0]}" == "YSI_$1/$2" ]];
	then
		IFS='/' read -ra x <<< "$3"
		if [[ "${p[1]}" == "md" ]];
		then
			mv "$3" "YSI-$1/README.md"
		else
			mv "$3" "YSI-$1/"
		fi
	#else
	#	rm -r "$3"
	fi
}

do_dir() {
	if [[ "$2" == "$3.inc" ]];
	then
		mv "$3" "YSI-$1/"
	elif [[ "YSI-$1" == "$3" ]];
	then
		:
		#echo "NOPE"
		#echo "$3"
	elif [[ "YSI_$1" == "$3" ]];
	then
		git ls-tree --name-only HEAD "YSI_$1/" | xargs -I@ bash -c "$(declare -f do_rm) ; do_rm $1 $2 @ ;"
		ls "YSI-$1/"
	else
		rm -r "$3"
	fi
}

do_part() {
	if [ ! -e YSI-$1 ]; then
		mkdir YSI-$1
		git ls-tree --name-only HEAD | xargs -I@ bash -c "$(declare -f do_dir) ; do_dir $1 $2 @ ;"
		if [ -e YSI_$1 ]; then
			rmdir YSI_$1
		fi
	fi
}

for i in ${arr[@]}
do
	IFS='/' read -ra l <<< "$i"
	echo "YSI-${l[0]}/${l[1]}"
	cp -r "Source" "YSI-${l[0]}@${l[1]}"
	cd "YSI-${l[0]}@${l[1]}"
#	git filter-branch --prune-empty --tree-filter "bash -c \"$(declare -f do_part) ; do_part ${l[0]} ${l[1]} @ ;\""
	git filter-branch --prune-empty --tree-filter "
		if [ ! -e YSI-${l[0]} ]; then
			mkdir YSI-${l[0]}
		fi
		git ls-tree --name-only \$GIT_COMMIT | xargs -I files /d/work/dir.sh ${l[0]} ${l[1]} files
		if [ -e YSI_${l[0]} ]; then
			rmdir YSI_${l[0]}
		fi
	"
	cd ..
done