weird update script

update.zsh

function up { # upgrade everything
  uplog=$(mktemp -t up.XXXXXX)
  (($+commands[tmux])) && {
    tmux select-window -t update 2>/dev/null || tmux rename-window update
    tmux split-window -d -p 40 -t update "echo    $uplog; tail -f $uplog"
  }

  function fun { (( $+functions[$1] || $+commands[$1] )) && echo -n "updating $2..." }
  fun config 'dotfiles'  && { config pull }                              &>> $uplog && c <<< 
  fun zpm 'zsh plugins'  && { zpm update }                               &>> $uplog && c <<< ▲
  fun tldr 'tldr'        && { tldr --update }                            &>> $uplog && c <<< ⚡
  fun brew 'brews'       && { brew upgrade; brew cleanup }               &>> $uplog && c <<< 
  fun nvim 'neovim'      && { nvim +PlugUpdate! +PlugClean! +qall }      &>> $uplog && c <<< 
  fun rustup 'rust'      && { rustup update stable; rustup update beta } &>> $uplog && c <<< 
  fun cargo 'crates'     && { cargo install-update --all }               &>> $uplog && c <<< 

  s 'Updated!\s+(.+/.+)' -r '$1' -N $uplog
  s 'Upgrading' -A1 -N $uplog | head -2 | tail -1
  s 'updated.*rustc' -N $uplog | cut -d' ' -f7 | paste -s -
  s '(.*)Yes$' --replace '$1' $uplog

  (($+commands[tmux])) && tmux kill-pane -t 0:update.-1
}