Bash function to get list of files that will be committed. Very handy when writing Git hooks.

commit_files.sh

# Function to get a list of files that will be committed by extension
# you can for example do "$(commit_files js css)" to get a list of js and css files that wil lbe commited
function commit_files() {
  
	if [ $# -eq 0 ] ; then
	    echo $(git diff-index --name-only --diff-filter=ACM --cached HEAD --)
	    exit 0
	fi

	extensions=''
	for extension in "$@"
	do
		extensions="${extensions}(${extension})|"
	done
	regex="\.(${extensions%?})$"
	echo $(git diff-index --name-only --diff-filter=ACM --cached HEAD -- | grep -P "$regex")
}