keygen

#!/usr/bin/env bash

set -Eeuo pipefail

BASE_DIR=$(dirname "${BASH_SOURCE[0]:-$0}")
cd "${BASE_DIR}/.." || exit 127

# shellcheck source=./helpers.sh
. helpers.sh

PROGRAM=$(basename "${BASH_SOURCE[0]:-$0}")
VERSION=0.9.0

function display_help() {
  cat <<EOF
  $(help_section Usage)
    ${PROGRAM} [OPTIONS] rsa [<comment>]

  $(help_section Options)
    -h, --help      Show this screen.
    -v, --version   Show version.

  $(help_section Examples)
    ${PROGRAM} rsa email@example.com
EOF
}

function generate_new_key() {
  local COMMENT=$1
  local SSH_PUB="$HOME/.ssh/id_rsa.pub"

  #TODO: add select to generate multiple key types
  ssh-keygen -t rsa -b 4096 -C "$COMMENT"

  if command -v xclip >/dev/null 2>&1; then
    xclip -selection clipboard <"$SSH_PUB"
  elif command -v pbcopy >/dev/null 2>&1; then
    pbcopy <"$SSH_PUB"
  elif command -v xsel >/dev/null 2>&1; then
    xsel --clipboard <"$SSH_PUB"
  elif command -v wl-copy >/dev/null 2>&1; then
    wl-copy <"$SSH_PUB"
  else
    echo "[ssh]: xclip, pbcopy, xsel and wl-copy not found, you need to copy manually the following key"
    cat "$SSH_PUB"
    exit 1
  fi

  echo "[ssh]: SSH public key copied into the clipboard"
}

case ${1:-error} in
  -h | --help)
    display_help
    ;;
  -v | --version)
    display_version "$PROGRAM" "$VERSION"
    ;;
  rsa)
    generate_new_key "${2:-$(whoami)@$(uname -n)}"
    ;;
  *)
    display_help >&2
    exit 1
    ;;
esac