Gentle idempotent Mac dev setup

Brewfile

tap "homebrew/bundle"
tap "homebrew/cask"
tap "homebrew/core"
cask "docker"
cask "iterm2"
cask "visual-studio-code"

homebrew-install.sh

#!/usr/bin/env zsh

brew_major_version=$(brew --version | head -c 10)

if [ "$brew_major_version" = 'Homebrew 3' ]; then
  echo 'Homebrew already installed'
  echo 'Updating Homebrew'
  brew update
else
  echo 'Installing Homebrew'
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
fi

echo 'Install and update packages in the Brewfile`
brew bundle

oh-my-zsh-install.sh

#!/usr/bin/env zsh

export OMZ=~/.oh-my-zsh

if [ -d $OMZ ]; then
  echo 'Oh My Zsh is already installed.'
else
  echo 'Installing Oh My Zsh:'
  sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
fi

export PLUGINS="alias-finder brew common-aliases git"

if grep -qF "plugins=(git)" ~/.zshrc; then
  sed -i '' "s/plugins=(git)/plugins=($PLUGINS)/g" ~/.zshrc
  echo 'Oh My Zsh plugins set to baseline.'
  source ~/.zshrc
else
  echo 'Oh My Zsh plugins left alone because they are not default. Current set of plugins:'
  grep "^plugins=" ~/.zshrc
fi

if [ ! -d $ZSH_CUSTOM/themes/powerlevel10k ]; then
  git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
fi

echo 'Set ZSH_THEME="powerlevel10k/powerlevel10k" in ~/.zshrc if you want this awesome theme.'

Run brew bundle dump to create a Brewfile based on your currently installed packages. You can overwrite an existing Brewfile, such as a version-controlled one, with brew bundle dump --force.