Now it can be sourced in a function, like zplug.
@ -1,5 +1,5 @@
local ret_status="%(?:%{$fg_bold[green]%}➜ :%{$fg_bold[red]%}➜ )"
PROMPT='${ret_status} %{$fg[cyan]%}%c%{$reset_color%} $(git_prompt_info)'
PROMPT="%(?:%{$fg_bold[green]%}➜:%{$fg_bold[red]%}➜)"
PROMPT+=' %{$fg[cyan]%}%c%{$reset_color%} $(git_prompt_info)'
ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg_bold[blue]%}git:(%{$fg[red]%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "