Generate QR code in shell.

qrify

#!/bin/bash
# Author: Linyos Torovoltos github.com/linyostorovovoltos

currentVersion="1.13.0"
multiline="0" # flag that indicates multiline option


getConfiguredClient()
{
  if command -v curl &> /dev/null ; then
    configuredClient="curl"
  elif command -v wget &> /dev/null ; then
    configuredClient="wget"
  else
    echo "Error: This tool requires either curl or  wget to be installed." >&2
    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=$(httpGet https://api.github.com/repos/$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 $repositoryName  ||  { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
        git clone "https://github.com/$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" || exit 1
        cd ..
        rm -r -f $repositoryName ||  { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
      else
        exit 1
      fi
    else
      echo "$repositoryName is already the latest version"
    fi
  fi

}

httpGet()
{
  case "$configuredClient" in
    curl) curl -A curl -s "$@";;
    wget) wget -qO- "$@";;
  esac
}

makeqr()
{
  input=$(echo $input | sed s/" "/%20/g ) ## replace all spaces in the sentence with HTML encoded space %20
  httpGet qrenco.de/$input ## get a response for the qrcode
}

makeMultiLineQr()
{
  if [[ $configuredClient != "curl" ]]; then ## prevent usage without curl it is unreliable
    echo "Multiline currently only supports curl!"
    return 1
  else
    printf "%s" "$*"  | curl -F-=\<- qrenco.de
  fi
}

checkInternet()
{
  httpGet google.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query google with a get request
}

usage()
{
  echo "Qrify"
  echo "Usage: qrify [stringtoturnintoqrcode]"
  echo "Description: Converts strings or urls into a qr code."
  echo "    -u Update Bash-Snippet Tools"
	echo "    -m Enable multiline support (feature not working yet)"
  echo "    -h Show the help"
  echo "    -v Get the tool version"
  echo "Examples:"
  echo "    qrify this is a test string"
  echo "    qrify -m two\\\\nlines"
  echo "    qrify github.com # notice no http:// or https:// this will fail"

}

getConfiguredClient || exit 1
checkInternet || exit 1

while getopts m:hvu*: option
do
  case "${option}" in
    v) echo "Version $currentVersion" && exit 0 ;;
    u) update && exit 0 || exit 1 ;;
    h) usage && exit 0 ;;
		m) multiline="1" && echo "Error this is not a supported feature yet" && exit 1 ;;
    *) usage && exit 0 ;;
  esac
done

if [[ $# == "0" ]]; then
  usage
  exit 0
elif [[ $1 == "help" ]]; then
  usage
  exit 0
elif [[ $1 == "update" ]];then
  update || exit 1
  exit 0
else
  if [[ $multiline == "0" ]];then
    input=$(printf '%s ' "$@")
    makeqr || exit 1
    exit 0
  else
    makeMultiLineQr "${@:2}" || exit 1 ## if multiline that means a flag existed so start from the second argument
    exit 0
  fi
fi
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