update.sh

#!/bin/bash
# Filename: update.sh
# Author: Víctor Molina Ferreira (github.com/victormln)
# Creation date: 26/12/2016
# Version: 1.0

#  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 2 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, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.

TODAY=$(date +%Y-%m-%d)

if ! command -v curl >/dev/null 2>&1; then
  echo -e "$CURL_NOT_INSTALLED_MESSAGE"
  exit 10
fi

if [[ "$TODAY" > "$LAST_UPDATE_CHECKED_IN" ]] || [ "$1" == "--update" ]; then
  echo -e "$FORCE_UPDATE_MESSAGE"
  if [ "$OS_TYPE" == "Darwin" ]; then
    sed_cmd=(sed -i '')
  else
    sed_cmd=(sed -i)
  fi

  SCRIPT_DIRECTORY=$(cd $(dirname $0) && pwd)
  "${sed_cmd[@]}" 's,^\(LAST_UPDATE_CHECKED_IN=\).*,\1'"$TODAY"',' "$SCRIPT_DIRECTORY"/conf/user.conf

  if $SEARCH_OTA || [ "$1" == "--update" ]; then
    last_version=$(curl -s --connect-timeout 5 https://raw.githubusercontent.com/victormln/alias/master/alias.sh | grep '# Version:' | cut -d: -f 2 | head -1)
    if [ -z "$last_version" ]; then
      echo -e "$NO_INTERNET_CONNECTION_MESSAGE"
    else
      last_version=${last_version//[[:blank:]]/}
      last_version_without_dots=$(echo "$last_version" | tr -d ".")
      actual_version_without_dots=$(echo "$CURRENT_VERSION" | tr -d ".")
      if ((actual_version_without_dots < last_version_without_dots)); then
        echo "###########################################"
        echo -e "$NEW_UPDATE_MESSAGE${NC}"
        echo "$YOU_HAVE_VERSION_MESSAGE: $CURRENT_VERSION"
        echo "$AVAILABLE_VERSION_MESSAGE: $last_version"
        echo "###########################################"

        if $AUTOMATIC_UPDATE; then
          echo "$AVAILABLE_VERSION_MESSAGE"
          git stash >/dev/null
          git pull origin master | tee >(echo "$UPDATING_PLEASE_WAIT_MESSAGE")
          echo -e "$UPDATE_DONE_MESSAGE"
        else
          echo "$AVAILABLE_UPDATE_MESSAGE"
          echo -en "$ASK_TO_DOWNLOAD_MESSAGE ${CYAN}$CONFIRM_OPTIONS${NC}: "; read -r want_to_update
          if [ "$want_to_update" == "s" ] || [ "$want_to_update" == "y" ] || [ "$want_to_update" == "S" ] || [ "$want_to_update" == "Y" ]; then
            git stash >/dev/null
            git pull | tee >(echo "$UPDATING_PLEASE_WAIT_MESSAGE")
            echo -e "$UPDATE_DONE_MESSAGE"
            exit
          else
            echo -e "$NOT_UPDATED_MESSAGE"
            echo -e "**************************"
          fi
        fi
      fi
    fi
  fi
  [ "$1" == "--update" ] && exit
fi