git-add-empty-files

#!/usr/bin/env bash

set -o errexit

function main() {
	declare -a files
	local create_new=""

	while [ "$#" -gt 0 ]; do
		local arg="$1"; shift
		case "$arg" in
			"--new"|"-n")
				create_new="yes"
				;;
			*)
				files+=( "$arg" )
				;;
		esac
	done

	if [ ${#files[@]} -le 0 ]; then
		echo "Need at least one file name"
		return 1;
	fi

	for file in "${files[@]}"; do
		add_empty_file "$create_new" "$file"
	done
}

function add_empty_file() {
	local create_new="$1"
	local filepath="$2"
	local mode="100644"

	if [ -z "$create_new" -a ! -f "$filepath" ]; then
		echo "File '$filepath' doesn't seem to exist."
		return 2
	fi

	local status="$(git status --ignored --porcelain=v1 "$filepath")"

	if [ "${status:0:3}" != "?? " -a "${status:0:3}" != "" ]; then
		echo "Can only add untracked files -- '$status'"
		return 3
	fi

	git update-index --add --cacheinfo "${mode},$(git hash-object -t blob -w /dev/null),${filepath}"
}

main "$@"