How can I add conditions to the display of certain elements of a ZSH prompt?

Question

I'm customizing my ZSH theme and I'm having some problems. To start with, I want some elements of my prompt to be displayed only when git and/or (my virtual environment) are used.

example: Here I have my neutral prompt.

╭─[Swidenn ⏾ Hades] ▶ ~/Documents/
╰─[2003]-$                                                            [10:00:00]

And here you can see that the git information has appeared between 2 square brackets.

╭─[Swidenn ⏾ Hades] ⟜[git:master]⊸ ▶ ~/Documents/
╰─[2003]-$                                                            [10:00:00]

Now I've activated a virtual environment.

╭─[Swidenn ⏾ Hades] ⟜[git:master]⊸ [venv] ▶ ~/Documents/
╰─[2003]-$                                                            [10:00:00]

My problem is this: I'd like to display my virtual environment in the square brackets next to my git, like this:

╭─[Swidenn ⏾ Hades] ⟜[git:master env:venv]⊸ ▶ ~/Documents/
╰─[2003]-$                                                            [10:00:00]

All without impacting my neutral prompt.

My prompts are as follows:

PROMPT='%{$fg_bold[green]%}╭─[%{$reset_color%}%{$fg_bold[white]%}Swidenn %{$reset_color%}%{$fg_bold[green]%}⚡%{$reset_color%}%{$fg_bold[white]%}%M%{$reset_color%}%{$fg_bold[green]%}]$(git_prompt_info) $(virtualenv_prompt_info)%{$reset_color%}%{$fg_bold[green]%}▷ %{$reset_color%}%{$fg[white]%}%~
%{$reset_color%}%{$fg_bold[green]%}╰─[%{$reset_color%}%{$fg[white]%}%!%{$reset_color%}%{$fg_bold[green]%}]-> '

RPROMPT='%{$reset_color%}%{$fg[white]%}%D{[%H:%M:%S]}'

I've tried using these variables

ZSH_THEME_GIT_PROMPT_PREFIX=" ⟜[%{$reset_color%}%{$fg[white]%}git:%{$fg_bold[white]%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}%{$fg[green]%}]⊸"

but I don't know what they're called, so it's difficult for me to find solutions.

Answer 1

So I solved my problem by using simple conditions directly in my theme file. Here is my code:

function neutral_prompt {
  echo "╭─[Swidenn ⚡ %M] ▷ %~
╰─[%!]-> "
}

function bracket_prompt {
  echo "╭─[Swidenn ⚡ %M] ⟜[$(git_prompt_info) $(virtualenv_prompt_info)]⊸ ▷ %~
╰─[%!]-> "
}

function final_prompt {
  if [[ $(git_prompt_info) == "" && $(virtualenv_prompt_info) == "" ]] ; then 
    prompt="$(neutral_prompt)"
  else
    prompt="$(bracket_prompt)"
  fi

PROMPT='$(final_prompt)'

Answer 2

You can display the output of a program (like /bin/pwd or date) in the prompt. So write a small shell script, and bury the conditional in there.

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