Bash-Snippets/weather/weather

#!/bin/bash
# Author: Alexander Epstein https://github.com/alexanderepstein

currentVersion="1.1.0" #This version variable should not have a v but should contain all other characters ex Github release tag is v1.2.4 currentVersion is 1.2.4

getWeather()
{
  country=$(curl -s ipinfo.io/country) > /dev/null ## grab the country
  if [[ $country == "US" ]];then ## if were in the us id rather not use longitude and latitude so the output is nicer
    city=$(curl -s ipinfo.io/city) > /dev/null
    region=$(curl -s ipinfo.io/region) > /dev/null
    region=$(echo "$region" | tr -dc '[:upper:]')
    curl wttr.in/$city,$region
  else ## otherwise we are going to use longitude and latitude
    location=$(curl -s ipinfo.io/loc) > /dev/null
    curl wttr.in/$location
  fi
}

checkInternet()
{
  echo "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1 # query google with a get request
  if [ $? -eq 0 ]; then #check if the output is 0, if so no errors have occured and we have connected to google successfully
    return 0
  else
    echo "Error: no active internet connection" >&2 #sent to stderr
    return 1
  fi
}

update()
{
  # Author: Alexander Epstein https://github.com/alexanderepstein
  # Update utility version 1.2.0
  # To test the tool enter in the defualt values that are in the examples for each variable
  repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
  githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
  nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
  latestVersion=$(curl -s https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option

  if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]];then
    echo "Error: update utility has not been configured correctly." >&2
    exit 1
  elif [[ $latestVersion == "" ]];then
    echo "Error: no active internet connection" >&2
    exit 1
  else
    if [[ "$latestVersion" != "$currentVersion" ]]; then
      echo "Version $latestVersion available"
      echo -n "Do you wish to update $repositoryName [Y/n]: "
      read -r answer
      if [[ "$answer" == "Y" || "$answer" == "y" ]] ;then
        cd  ~ || { echo 'Update Failed' ; exit 1 ; }
        if [[ -d  ~/$repositoryName ]]; then rm -r -f $repositoryName  || { echo "Your password is required to continue with the update" ; sudo rm -r -f $repositoryName ; }; fi #sudo command only on error
        git clone "https://github.com/$githubUserName/$repositoryName" || { echo "Couldn't download latest version" ; exit 1; }
        cd $repositoryName ||  { echo 'Update Failed' ; exit 1 ;}
        git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
        chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
        ./$nameOfInstallFile "update" || { echo "Your password is required to continue with the update" ; sudo ./$nameOfInstallFile "update" ; }
        cd ..
        rm -r -f $repositoryName || sudo rm -r -f $repositoryName #sudo command only on error
      else
        exit 1
      fi
    else
      echo "$repositoryName is already the latest version"
    fi
  fi

}

checkInternet || exit 1 # check if we have a valid internet connection if this isnt true the rest of the script will not work so stop here

if [[ $# == 0 ]]; then
getWeather
elif [[ $1 == "update" ]]; then
update
fi


while getopts "uv" opt; do
  case $opt in
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    h)
      help
    ;;
    v)
      echo "Version $currentVersion"
      exit 0
    ;;
    u)
      update
      exit 0
    ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done