install.fairie/scripts/partials/homebrew

# @description This function ensures Homebrew is installed and available in the `PATH`. It handles the installation of Homebrew on both **Linux and macOS**.
#     It will attempt to bypass sudo password entry if it detects that it can do so. The function also has some error handling in regards to various
#     directories falling out of the correct ownership and permission states. Finally, it loads Homebrew into the active profile (allowing other parts of the script
#     to use the `brew` command).
#
#     With Homebrew installed and available, the script finishes by installing the `gcc` Homebrew package which is a very common dependency.
ensureHomebrew() {
  if ! command -v brew > /dev/null; then
    if [ -d /home/linuxbrew/.linuxbrew/bin ]; then
      logg info "Sourcing from /home/linuxbrew/.linuxbrew/bin/brew" && eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
      if ! command -v brew > /dev/null; then
        logg error "The /home/linuxbrew/.linuxbrew directory exists but something is not right. Try removing it and running the script again." && exit 1
      fi
    elif [ -d "$HOME/.linuxbrew" ]; then
      logg info "Sourcing from $HOME/.linuxbrew/bin/brew" && eval "$($HOME/.linuxbrew/bin/brew shellenv)"
      if ! command -v brew > /dev/null; then
        logg error "The $HOME/.linuxbrew directory exists but something is not right. Try removing it and running the script again." && exit 1
      fi
    else
      ### Installs Homebrew and addresses a couple potential issues
      if command -v sudo > /dev/null && sudo -n true; then
        logg info "Installing Homebrew"
        echo | /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
      else
        logg info "Homebrew is not installed. The script will attempt to install Homebrew and you might be prompted for your password."
        /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" || BREW_EXIT_CODE="$?"
        if [ -n "$BREW_EXIT_CODE" ]; then
          if command -v brew > /dev/null; then
            logg warn "Homebrew was installed but part of the installation failed. Trying a few things to fix the installation.."
            BREW_DIRS="share/man share/doc share/zsh/site-functions etc/bash_completion.d"
            for BREW_DIR in $BREW_DIRS; do
              if [ -d "$(brew --prefix)/$BREW_DIR" ]; then
                logg info "Chowning $(brew --prefix)/$BREW_DIR" && sudo chown -R "$(whoami)" "$(brew --prefix)/$BREW_DIR"
              fi
            done
            logg info "Running brew update --force --quiet" && brew update --force --quiet && logg success "Successfully ran brew update --force --quiet"
          fi
        fi
      fi

      ### Ensures the `brew` binary is available on Linux machines. macOS installs `brew` into the default `PATH` so nothing needs to be done for macOS.
      if [ -d /home/linuxbrew/.linuxbrew/bin ]; then
        logg info "Sourcing shellenv from /home/linuxbrew/.linuxbrew/bin/brew" && eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
      elif [ -f /opt/homebrew/bin/brew ]; then
        logg info "Sourcing shellenv from /opt/homebrew/bin/brew" && eval "$(/opt/homebrew/bin/brew shellenv)"
      fi
    fi
  fi

  ### Ensure GCC is installed via Homebrew
  if command -v brew > /dev/null; then
    if ! brew list | grep gcc > /dev/null; then
      logg info "Installing Homebrew gcc" && brew install --quiet gcc
    fi
  else
    logg error "Failed to initialize Homebrew" && exit 2
  fi
}