#!/usr/bin/env bash

# figure out which directory we are stored in
# https://stackoverflow.com/questions/59895/can-a-bash-script-tell-what-directory-its-stored-in
_GITNONYMOUS_SRC="${BASH_SOURCE[0]}"
# resolve $_GITNONYMOUS_SRC until the file is no longer a symlink
while [ -h "$_GITNONYMOUS_SRC" ]; do
  dir="$( cd -P "$( dirname "$_GITNONYMOUS_SRC" )" && pwd )"
  _GITNONYMOUS_SRC="$(readlink "$_GITNONYMOUS_SRC")"
  # if $_GITNONYMOUS_SRC was a relative symlink, we need to resolve it
  # relative to the path where the symlink file was located
  [[ $_GITNONYMOUS_SRC != /* ]] && _GITNONYMOUS_SRC="$DIR/$_GITNONYMOUS_SRC"
done
dir="$( cd -P "$( dirname "$_GITNONYMOUS_SRC" )" && pwd )"
unset _GITNONYMOUS_SRC

# set up our other variables
confdir="${HOME}/.gitnonymous-${1}"
sshfile="${confdir}/ssh/identity"
configfile="${confdir}/config"
sshwrapperfile="${confdir}/git-ssh-wrap"

if [ "$1" = "" -o '-h' = "$1" -o '--help' = "$1" ]
then
  echo "Usage: $0 KEYNAME [SSH-KEYGEN-PARAMETERS]"
else
  id="${1}"
  shift
  comment="id@anonymous"
  echo "-> Creating ${confdir}."
  mkdir -p "${confdir}/ssh"
  echo "-> Creating SSH key '${sshfile}'."
  echo "SSH key comment (public) is '${comment}'."
  ssh-keygen -C "${comment}" -f "${sshfile}" "$@"
  echo "-> Creating SSH wrapper '${sshwrapperfile}'."
  cat "${dir}/git-ssh-wrap" | sed "s/KEYNAME/${id}/" > "${sshwrapperfile}"
  chmod 755 "${sshwrapperfile}"
  echo "-> Creating config file '${configfile}'."
  cp ${dir}/config "${configfile}"
  echo "-> Pubkey follows:"
  echo
  cat ${sshfile}.pub
  echo
  echo " *** You should now edit '${configfile}' and set your own pseudonymous username and email. ***"
  echo
  echo "-> To use your new identity:"
  echo ". ${0/-setup/} ${id}"
fi