git: pre-commit hook to set user.email

#!/bin/sh

# --------------------------------------------------------
# Installation
# $ git config --global init.templatedir '~/.git-templates' # setup global templatedir
# $ mkdir -p ~/.git-templates/hooks # create hooks direcotry
# $ touch ~/.git-templates/hooks/pre-commit # copy & paste this content into ~/.git-templates/hooks/pre-commit
# $ chmod a+x ~/.git-templates/hooks/pre-commit
# $ git init # reinitialized existing git repositories
# --------------------------------------------------------

# allows us to read user input below, assigns stdin to keyboard
exec < /dev/tty

ask_for_email() {
	read -p "Please provide user.email: " email
	git config --local user.email $email
}

if git rev-parse --git-dir > /dev/null 2>&1; then
	if ! git config --local user.email > /dev/null 2>&1; then
		while true; do
	    read -p "Do you wish to use the global user.email?(y/n) " yn
	    case $yn in
	        [Yy]* ) git config --local user.email $(git config --global --get user.email); break;;
	        [Nn]* ) ask_for_email; break;;
	        * ) echo "Please answer yes or no.";;
	    esac
	done
	fi
fi