Bash prompt that asks for email address to configure for git repository

git-email-prompt.bash

#!/bin/bash

# git-email-prompt.bash yesmar@gmail.com
# Bash prompt that asks for email address to configure for git repository.

# This is a modified version of the script originally created by
# [Marvin Frommhold](http://depressiverobot.com/2015/01/05/git-email.html).
# I have extracted the hardcoded email addresses out of script. Create a
# ~/.gitmails file and put your email addresses in there. The content of the
# file should look like:
#
# ----- snip -----
# declare -a MAILS=(
# private@example.com
# work@example.com
# phd@example.com
# )
# ----- snip -----
#
# Note that the first entry will become the default, so choose wisely.

# Load available emails.
email_addresses=~/.gitmails
if [ -f $email_addresses ]; then
  # shellcheck disable=SC1090
  . $email_addresses
else
  printf "error: please configure at least one address in %s\n" "$email_addresses"
  exit 1
fi

# Prompt for email.
printf "\nWhich email address should be configured for this repository?\n\n"
printf "Press [Enter] to abort...\n\n"
for ((i = 0; i < ${#MAILS[*]}; ++i)); do
  if ((i == 0)); then
    printf "[%s%d%s]" "$(tput bold)" $((i + 1)) "$(tput sgr 0)"
  else
    printf " %s%d%s " "$(tput bold)" $((i + 1)) "$(tput sgr 0)"
  fi
  printf " %s\n" "${MAILS[$i]}"
done
printf "\nemail: "
# shellcheck disable=SC2162
read -n 1 email

# Pressing enter accept the first selection.
if [[ "$email" == "" ]]; then
  email="1"
else
  printf "\n"
fi

# It's an error if number is less than 1 or greater than number of emails.
if [[ $email -lt "1" || $email -gt ${#MAILS[*]} ]]; then
  printf "\n%serror%s: %s%s%s is invalid. No email set.\n\n" "$(tput setaf 1)" "$(tput sgr 0)" "$(tput bold)" "$email" "$(tput sgr 0)"
  exit 1
fi

# Set email address.
printf "\nSet %s%s%s as email for this repository.\n\n" "$(tput bold)" "${MAILS[$((email - 1))]}" "$(tput sgr 0)"
git config user.email "${MAILS[$((email - 1))]}"

exit 0