#!/usr/bin/env bash
# pass append - Password Store Extension (https://www.passwordstore.org/)
# Copyright (C) 2021
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
# []

VERSION="0.0.1"
PASSWORD_STORE_LOCATION="~/password-store"

cmd_append_usage() {
  cat <<-_EOF
Usage:
    $PROGRAM append [filename]
      Generates a strong password, copies it to the clipboard, and runs pass insert -m [filename]
          Based on the pass reveal extension, itself based on the pass backup extension.
    $PROGRAM append help
        Prints this help message.
    $PROGRAM append version
        Prints the version number.

Example: $PROGRAM append services/amazon
        Generates a strong password, copies it to the clipboard, 
        and starts pass insert -m services/amazon
For installation place this bash script file "append.bash" into
the passwordstore extension directory specified with \$PASSWORD_STORE_EXTENSIONS_DIR.
By default this is ~/.password-store/.extensions.
E.g. cp append.bash ~/.password-store/.extensions
Give the file execution permissions:
E.g. chmod 700 ~/.password-store/.extensions/append.bash
Set the variable PASSWORD_STORE_ENABLE_EXTENSIONS to true to enable extensions.
E.g. export PASSWORD_STORE_ENABLE_EXTENSIONS=true
Source the bash completion file "pass-append.bash.completion" for bash completion.
E.g. source ~/.password-store/.bash-completions/pass-append.bash.completion
Type "pass append query" to make your first query
E.g. pass append query
_EOF
  exit 0
}

cmd_append_version() {
  echo $VERSION
  exit 0
}

cmd_append_append() {
  ## [[ $# -gt 1 ]] && die "Too many arguments. At most 1 argument allowed."

  # expect 0 or 1 argument
  # ignore 2nd argument and higher
  if [ $# -eq 0 ]; then
   echo "Error: Query is empty"
  else

    ARGS="$@"
    charstring1='"'
    charstring2="\!#\$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_\`abcdefghijklmnopqrstuvwxyz{|}~"

    characters="$charstring1$charstring2"
    
    length=25
    read -r -n $length new_password < <(LC_ALL=C tr -dc "$characters" < /dev/urandom)
    
    printf "$new_password" | xclip -sel clip
    echo "Copied new password to clipboard: "
    echo "$new_password"

    pass insert -m "$ARGS"

  fi
}

case "$1" in
help | --help | -h)
  shift
  cmd_append_usage "$@"
  ;;
version | --version | -v)
  shift
  cmd_append_version "$@"
  ;;
*) cmd_append_append "$@" ;;
esac
exit 0