NOTE

https://blog.flowblok.id.au/2013-02/shell-startup-scripts.html
https://heptapod.host/flowblok/shell-startup


fresh
stable
out_of_sync: either is true:
  staging_outdated
  dest_staging_diff

fresh->stable: fresh_setup
stable->out_of_sync: Modify either some source files or some destination (live) files
out_of_sync->{out_of_sync,stable}
  if staging_outdated: re-build
  if dest_staging_diff: diff, verify and apply

TODO: offline, windows, linux

Homebrew offline
  Homebrew git remote mirroring: https://docs.brew.sh/Installation#git-remote-mirroring
  https://docs.brew.sh/Manpage#environment
    HOMEBREW_API_DOMAIN
    HOMEBREW_ARTIFACT_DOMAIN
    HOMEBREW_BOTTLE_DOMAIN
    HOMEBREW_BREW_GIT_REMOTE
    HOMEBREW_CORE_GIT_REMOTE
    HOMEBREW_NO_AUTO_UPDATE
    HOMEBREW_CACHE
  brew fetch
    HOMEBREW_CACHE
    --os, --arch
    https://github.com/Homebrew/legacy-homebrew/issues/5220
  brew install
    HOMEBREW_CACHE
    HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK
  brew update
    HOMEBREW_CORE_GIT_REMOTE
  https://github.com/Homebrew/brew/blob/master/Library/Homebrew/official_taps.rb

https://github.com/Homebrew/install/blob/master/install.sh


Future versions of macOS won’t include scripting language runtimes (e.g. Python, Ruby, and Perl) by default.

https://developer.apple.com/documentation/macos-release-notes/macos-catalina-10_15-release-notes#Deprecations

vimplug
  https://github.com/junegunn/vim-plug/issues/808
  https://stackoverflow.com/questions/60057790

optimize startup time
  Dynamic compspecs loading https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion.html

https://work.lisk.in/2020/11/20/even-faster-bash-startup.html