This was caused by dbeb163

Because of how antigen works, when it loads from the cache, at the point where it sources the plugin file, $1 is unfortunately set to apply, so all the gitstatus functions are loaded with the apply suffix with breaks quite a few things.

Additionally, on initial load with zgen, the following error pops up:

/Users/belak/.zgen/romkatv/gitstatus-master/gitstatus.plugin.zsh:typeset:58: not valid in this context: _gitstatus_plugin_dir/Users/belak/.zgen/romkatv/gitstatus-master/gitstatus.plugin.zsh

It seems like at that point, $1 is /Users/belak/.zgen/romkatv/gitstatus-master/gitstatus.plugin.zsh.

zplug works, but this is only because it uses shift so by the time the file is sourced, $1 is no longer set: https://github.com/zplug/zplug/blob/master/base/core/load.zsh#L62-L81

Sample usage with antigen:

[[ ! -d "$HOME/.antigen" ]] && git clone https://github.com/zsh-users/antigen.git "$HOME/.antigen"
source "$HOME/.antigen/antigen.zsh"
antigen bundle romkatv/gitstatus
antigen apply

Sample usage with zgen:

[[ ! -d "$HOME/.zgen" ]] && git clone https://github.com/tarjoilija/zgen.git "$HOME/.zgen"
source "${HOME}/.zgen/zgen.zsh"
if ! zgen saved; then
  zgen load romkatv/gitstatus
  zgen save
fi

Is there a different variable that could be used other than $1? It seems like the current setting is an easy way to silently break things in unexpected ways.