Maintain idempotency in ~/.laptop.local when using Homebrew

[AlJohri]

I understand a lot of emphasis has been given to keep laptop idempotent (https://github.com/thoughtbot/laptop/search?q=idempotency&type=Issues). I was wondering if you have any ideas on how to maintain idempotency in one's personal ~/.laptop.local script.

Particularly, I would like to be able to use the functions written here, https://github.com/thoughtbot/laptop/blob/master/mac-components/mac-functions, within my local script.

My main issue is that when my script attempts to install homebrew packages I get warnings that they are already installed as opposed to simply upgrading them.

In addition, it would lovely if brew_install_or_upgrade could be accompanied with a brew_cask_install_or_upgrade. I understand considerable thought has been given to the implications of supporting brew cask:

• Brewfiles/Caskfiles - Brewfiles #175
• Install Google Chrome - Install Google Chrome #49
• Install Dropbox - Install Dropbox? #48
• Install XQuartz - Install XQuartz #51
• Install iTerm2 - Install iTerm2? #50

but at the very least, supporting it as a function usable via ~/.laptop.local would allow for an extremely clean and readable configuration file.

Do you know any easy ways of accessing the mac-functions within ~/.laptop.local?
What are your thoughts on supporting brew-cask in this non-invasive / easy-to-maintain manner?

[djcp]

~/.laptop.local is sourced at the end, so it runs context of the greater laptop script and has access to the functions it contains.

To the more osx-y questions, I'll let others help you out.

[croaky]

@AlJohri There's not a lot of great, built-in support for brew cask upgrade or brew cask outdated but it is a high priority for the Homebrew Cask team:

Homebrew/homebrew-cask#4678
Homebrew/homebrew-cask#309

I've subscribed to those issues. If they get merged, I'll try to add a brew_cask_install_or_upgrade function at that time. In the meantime, as @djcp mentioned, brew_install_or_upgrade, fancy_echo and other functions defined in https://github.com/thoughtbot/laptop/blob/master/mac are available for use in ~/.laptop.local.

[AlJohri]

Thanks for the responses! I didn't realize I could use the functions in ~/.laptop.local.

@croaky, it seems brew cask upgrade is far off from being completed - perhaps until then you could support a brew_cask_install_or_noop

The regular output of "Cask is already installed" is quite jarring.

[AlJohri]

This is kind of what I meant:

https://github.com/AlJohri/dotfiles/blob/master/setup-homebrew.sh#L12

brew_cask_expand_alias() {
  brew cask info "$1" 2>/dev/null | head -1 | awk '{gsub(/:/, ""); print $1}'
}

brew_cask_is_installed() {
  local NAME=$(brew_cask_expand_alias "$1")
  brew cask list -1 | grep -Fqx "$NAME"
}

brew_cask_install_or_upgrade() {
  if brew_cask_is_installed "$1"; then
    echo "$1 is already installed, brew cask upgrade is not yet implemented"
  else
    brew cask install "$@"
  fi
}

I know you currently don't echo within the commands (and fancy_echo outside) but at least supporting brew_cask_expand_alias and brew_cask_is_installedwould be a nice syntactical sugar.

[croaky]

Thanks for the code, @AlJohri. Others have been circling around similar ideas in other pull requests. We just created a wiki page that contains a few community extensions:

https://github.com/thoughtbot/laptop/wiki

Feel free to add further customizations you think might be valuable to others.