direnv sub-commands completion for zsh. inspired https://gist.github.com/yonchu/5005758

_direnv

#compdef direnv

# setopt -eu

function _direnv {
local direnv
local -a comp_list

direnv="\
allow[Grants direnv to load the given .envrc]
deny[Revokes the auhorization of a given .envrc]
edit[Edits .envrc]
help[shows this help]
hook[Used to setup the shell hook]
reload[triggers an env reload]
status[prints some debug status informations]
stdlib[Displays the stdlib available in the .envrc execution context]"

comp_list=( ${(f)direnv} )
_values 'direnv subcmds' "$comp_list[@]"
}

_direnv "$@"

恐らくyonchuさんの_httpstatusを参考にしたと思われる。
forkしたほうが良かったかな…。