regenerated adds a noticable delay to zsh startup. This little hack restricts

it to once a day. It should be pasted into your own completion file.

The globbing is a little complicated here:

- '#q' is an explicit glob qualifier that makes globbing work within zsh's [[ ]] construct.

- 'N' makes the glob pattern evaluate to nothing when it doesn't match (rather than throw a globbing error)

- '.' matches "regular files"

- 'mh+24' matches files (or directories or whatever) that are older than 24 hours.

autoload -Uz compinit if [[ -n ${ZDOTDIR}/.zcompdump(#qN.mh+24) ]]; then compinit; else compinit -C; fi;