Install binary language interpreter version manager asdf on mac with no assumption. Script tries to be as idempotent as possible.

install-asdf-mac.sh

echo "Be sure to uninstall rvm, rbenv, nvm, and any other version managers ... they will probably interfere with asdf's magic."
echo -e "\033[1;32mBeginning major install process... 🐋🚀 \033[0m"

command -v brew >/dev/null 2>&1 || /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

echo "Installing GPG Encryption"
brew list gpg >/dev/null || brew install gpg

echo "Installing asdf tool!"
brew list asdf >/dev/null || brew install asdf

if [[ -f ~/.bash_profile ]]; then
    grep asdf ~/.bash_profile >/dev/null || printf "\n. /usr/local/opt/asdf/asdf.sh\n. /usr/local/opt/asdf/etc/bash_completion.d/asdf.bash\n" >> ~/.bash_profile
    . ~/.bash_profile
fi
if [[ -f ~/.zshrc ]]; then
    grep asdf ~/.zshrc >/dev/null && printf "\n. /usr/local/opt/asdf/asdf.sh\n" >> ~/.zshrc
    . ~/.zshrc
fi

which node | grep "/usr/local/bin/node" >/dev/null && echo -e "\033[0;31mYour path is resolving to /usr/local/node when it should be using asdf. You will need to fix it so ~/.asdf/shims appears in your path before /usr/local/bin  \033[0m"

echo "Installing Ruby!"
asdf plugin-list | grep ruby >/dev/null 2>&1 || asdf plugin-add ruby
asdf list ruby | grep 2.6.3 >/dev/null 2>&1 || asdf install ruby 2.6.3
asdf global ruby 2.6.3

echo "Installing NodeJS!"
asdf plugin-list | grep nodejs >/dev/null 2>&1 || asdf plugin-add nodejs
asdf list nodejs | grep 12.11.1 >/dev/null 2>&1 || asdf install nodejs 12.11.1
asdf global nodejs 12.11.1
gpg -k | grep "Gibson Fahnestock" >/dev/null || bash ~/.asdf/plugins/nodejs/bin/import-release-team-keyring
command -v yarn >/dev/null 2>&1 || npm install -g yarn

echo "Reshimming asdf."
asdf reshim

echo -e "\033[1;32mDone. Thank you for playing. Enjoy responsibly. 💚\033[0m"
echo -e "It is strongly recommended to open a new Terminal tab/window now to avoid hard-to-debug issues."