Detect Brew Prefix If Needed

brew_detect.sh

#!/bin/bash

BREW_PATH="$(which brew)"
BREW_PATH_RESULT=$?

if [[ $BREW_PATH_RESULT -ne 0 ]] || [[ -z "$BREW_PATH" ]]; then 
    echo "It looks like Homebrew is not already installed."
    echo "Finding path where it will be..."
    arch="$(arch)"  # -i is only linux, -m is linux and apple
    if [[ "$arch" = i386 ]]; then
        echo "You are on an Intel machine. So.."
        BIN_PREFIX="/usr/local/bin/"
    elif [[ "$arch" = arm64 ]]; then
        echo "You are on an Apple Silicon machine. So .."
        BIN_PREFIX="/opt/homebrew/bin/"   
    else
        echo "Unknown CPU Architecture: $arch" 
    fi
elif [[ $BREW_PATH_RESULT -eq 0 ]]; then
    echo "It looks like Homebrew is already installed and in your PATH."
    echo "Therefore we won't use a prefix."
    ACTUAL_BIN_PATH="$(dirname $BREW_PATH)"
fi

echo ""
echo "Will use bin prefix for Homebrew commands:"
echo -e " ${BIN_PREFIX-\033[0;32mnone\033[0m}"
echo "Current actual path to Homebrew commands:"
echo -e " ${ACTUAL_BIN_PATH-\033[0;31not installed\033[0m}"