Dual architecture on M1 Apple Silicon

.zshrc

# Homebrew
_ARCH=$(arch)
PROMPT="$_ARCH $PROMPT"
if [[ "$_ARCH" == "i386" ]]; then
  local brew_path="/usr/local/homebrew/bin"
  local brew_opt_path="/usr/local/homebrew/opt"
  local nvm_path="$HOME/.nvm-x86"
  local rbenv_path="$HOME/.rbenv-x86"
fi
if [[ "$_ARCH" == "arm64" ]]; then
  local brew_path="/opt/homebrew/bin"
  local brew_opt_path="/opt/homebrew/opt"
  local nvm_path="$HOME/.nvm"
  local rbenv_path="$HOME/.rbenv"
fi

export PATH="${brew_path}:${brew_opt_path}:${PATH}"

# Node
# https://seannicdao.com/2021/02/dual-install-homebrew-nvm-and-node-on-apple-m1/
export NVM_DIR="${nvm_path}"
[ -s "${brew_opt_path}/nvm/nvm.sh" ] && \. "${brew_opt_path}/nvm/nvm.sh"  # This loads nvm
[ -s "${brew_opt_path}/nvm/etc/bash_completion.d/nvm" ] && \. "${brew_opt_path}/nvm/etc/bash_completion.d/nvm"  # This loads nvm bash_completion

# Ruby
export RBENV_ROOT="${rbenv_path}"
eval "$(rbenv init - zsh)"

# Dip
dip version > /dev/null 2>&1 && eval "$(dip console)"