Function to get a program version and display it in the Zsh shell prompt.

program-version-in-shell-prompt.zsh-theme

/* Tested on Robby Russell theme, and Python and Node programs.
- Duplicate the current theme you are using and copy it to .oh-my-zsh/custom/themes.
For example, if you're using Robby Russell, the custom file should also be robbyrussell.zsh-theme.
- Paste the following code at the end of the custom file to override some parts of the current them.e
*/
function program_prompt_version() {
    # $1 is the name of the program, e.g. python, node.
    # $2 is the command used to get the version of the program. For Node, it's `-v`. For Python, it's `-V`.
    if which $1 &> /dev/null; then
        local version=$($1 -$2)
        # Running `python -V` will output something like `python 3.8.2` so we need to strip out the first word.
        if [ "$1" = "python" ]; then
                version=$(echo $version | awk -F" " '{print $NF}')
        fi
        echo "%{$fg_bold[blue]%}$1(%{$fg[red]%}$version%{$fg[blue]%}) %{$reset_color%}"
    fi
}

last_two_dir='%S%F{cyan}%2~%f%s'
newline=$'\n👉 '
PROMPT='%{$last_two_dir%} $(program_prompt_version node v)$(program_prompt_version python V) $(git_prompt_info)${newline}'
ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg_bold[blue]%}git:(%{$fg[red]%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[blue]%}) %{$fg[yellow]%}✗"

What the shell prompt should look like