zplug-if(5)
The conditions under which to install and/or use the package
Description
ZPLUG-IF
NAME
zplug-if - The conditions under which to install and/or use the package
SYNOPSIS
zplug "username/reponame", if:(( $+commands[git] ))
The word ´package´ refers to the string in the format: "username/reponame".
DESCRIPTION
By using if tag, you can choose whether the package you want to install will be installed as the plugin or as the command.
Table 1. zplug if tag

Besides, by using zstyle command, you can change default value:
$ zstyle ":zplug:tag" if "[[ $OSTYPE == *darwin* ]]"
EXAMPLES
Load if the local directory exists:
$ zplug
"˜/.zsh" \
from:local, \
use:"*.{sh,zsh}", \
if:"[ -d ˜/.zsh ]"
SEE ALSO
zplug(1)
FURTHER DOCUMENTATION
See the references in official wiki page to get started using zplug. The wiki may perhaps be overwhelming for first-time users.
AUTHORS
zplug was originally written by Masaki Ishiyama (a.k.a @b4b4r07). Many people have contributed to it.
COPYING
Copyright (C) 2015-2016 Masaki Ishiyama
MIT License
REPORTING BUGS
Report bugs to the zplug issues