install or swap Terraform versions on Mac OSX.

terraform-update-install-sh

#!/usr/bin/env bash

scratch=$(mktemp -d -t tmp.XXXXXXXXXX)
function finish {
  rm -rf "$scratch"
}
trap finish EXIT

STAGE=1

function step_message (){
    echo -ne "\033[0;36mSTEP ${STAGE})\033[0m: \033[0;35m${@}\033[0m\n"
    let "STAGE++"
}

if command -v dialog; then
	true;
else
	echo "install dialog";
	echo "MACOSX: 'brew install dialog; brew upgrade dialog;'";
	exit 1;
fi

if command -v curl; then
        true;
else
        echo "install curl";
        echo "MACOSX: 'brew install curl; brew upgrade curl;'";
        exit 1;
fi

# TODO Dynamic Options Array..., would also need improves case statement logic...
# $ curl -skL https://releases.hashicorp.com/terraform/ | grep 'a href' | grep '/terraform' | grep '\.[0-9]*</a>' | sed -e 's@^.*\w*<a href="/[a-z]*/\([0-9\.]*\)/">.*$@\1@' | sort -t '.' -k2 -n --uniq

HEIGHT=15
WIDTH=40
CHOICE_HEIGHT=4
BACKTITLE="Backtitle here"
TITLE="Choose Terraform Version"
MENU="Choose one of the following options:"
OPTIONS=( 1 "v0.11.14"
          2 "v0.12.0"
          3 "v0.10.8"
          4 "v0.9.11"
          5 "v0.8.8"
          6 "v0.7.13"
          7 "v0.6.16"
          8 "v0.5.3"
          9 "v0.4.2"
          10 "v0.3.7"
          11 "v0.2.2"
          12 "v0.1.1")

CHOICE=$(dialog --clear \
                --backtitle "$BACKTITLE" \
                --title "Choose Terraform Version" \
                --menu "Choose one of the following options:" \
                $HEIGHT $WIDTH $CHOICE_HEIGHT \
                "${OPTIONS[@]}" \
                2>&1 >/dev/tty)


STRING="You chose Terraform version:"
clear
case $CHOICE in
  1)
    VERSION="0.11.14" ;
    echo "${OPTIONS[1]}"
    ;;
  2)
    VERSION="0.12.0" ;
    echo "${OPTIONS[2+1]}"
    ;;
  3)
    VERSION="0.10.8" ;
    echo "${OPTIONS[4+2:A1]}"
    ;;
  4)
    VERSION="0.9.11" ;
    ;;
  5)
    VERSION="0.8.8" ;
    ;;
  6)
    VERSION="0.7.13" ;
    ;;
  7)
    VERSION="0.6.16" ;
    ;;
  8)
    VERSION="0.5.3" ;
    ;;
  9)
    VERSION="0.4.2" ;
    ;;
  10)
    VERSION="0.3.7" ;
    ;;
  11)
    VERSION="0.2.2" ;
    ;;
  12)
    VERSION="0.1.1" ;
    ;;
  *)
    echo "exiting caused by user abort."
    exit 0;
    ;;
esac

echo "${STRING} ${VERSION}";

URL="https://releases.hashicorp.com/terraform/${VERSION}/terraform_${VERSION}_darwin_amd64.zip";

step_message "Downloading Terraform:\t\t\t'${URL}'" ;
curl -skL -o "${scratch}/terraform_${VERSION}_darwin_amd64.zip" "${URL}" ;

step_message "Extracting Binary from Archive:\t'${scratch}/terraform_${VERSION}_darwin_amd64.zip'" ;
unzip -q "${scratch}/terraform_${VERSION}_darwin_amd64.zip" -d ${scratch} ;

step_message "ensuring directory ${HOME}/.bin exists." ;
mkdir -p "${HOME}/.bin" ;

step_message "installing terraform binary at '${HOME}/.bin/tf_${VERSION}'" ;
chmod +x "${scratch}/terraform" && \
chown "$(id -un):$(id -gn)" "${scratch}/terraform" && \
mv "${scratch}/terraform" "${HOME}/.bin/tf_${VERSION}" && \
ln -sf "${HOME}/.bin/tf_${VERSION}" "${HOME}/.bin/terraform" ;

if ! grep -q 'export PATH="${PATH}:${HOME}/.bin";' ~/.bash_profile; then
  step_message "patching \$PATH in ${HOME}/.bash_profile to include ${HOME}/.bin" ;
  sed -i'' -e '/export PATH="${PATH}:${HOME}\/.bin";/d' ${HOME}/.bash_profile ;
  echo 'export PATH="${PATH}:${HOME}/.bin";' >> ${HOME}/.bash_profile ;
  echo "run the following command to activate change."
  echo "source '${HOME}/.bash_profile';"
fi