Provided by: zplug_2.4.2-1_all 

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
┌─────────────────┬───────────────┐
│ Possive Values │ Default value │
├─────────────────┼───────────────┤
│ │ │
│ plugin, command │ plugin │
└─────────────────┴───────────────┘
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
ZPLUG Manual 11/21/2016 ZPLUG-IF(5)