feat(virtualenv): Use $VIRTUAL_ENV_PROMPT if set

Modify the `virtualenv_prompt_info` function to use the prompt string
specified when creating the virtual environment, instead of just the
basename of the environment. If `VIRTUAL_ENV_PROMPT` is not set, fall
back to just using the basename of `$VIRTUAL_ENV`.

plugins/virtualenv/README.md

@@ -7,8 +7,11 @@ To use it, add `virtualenv` to the plugins array of your zshrc file:
 plugins=(... virtualenv)
 ```
 
-The plugin creates a `virtualenv_prompt_info` function that you can use in your theme, which displays
+The plugin creates a `virtualenv_prompt_info` function that you can use in your theme. It
-the basename of the current `$VIRTUAL_ENV`. It uses two variables to control how that is shown:
+displays the prompt string set when creating the virtual environment (via the `--prompt` option),
+falling back to the basename of the current `$VIRTUAL_ENV`.
+
+It uses two variables to control how that is shown:
 
 - `ZSH_THEME_VIRTUALENV_PREFIX`: sets the prefix of the VIRTUAL_ENV. Defaults to `[`.
 

plugins/virtualenv/virtualenv.plugin.zsh

@@ -1,6 +1,16 @@
 function virtualenv_prompt_info(){
   [[ -n ${VIRTUAL_ENV} ]] || return
-  echo "${ZSH_THEME_VIRTUALENV_PREFIX=[}${VIRTUAL_ENV:t:gs/%/%%}${ZSH_THEME_VIRTUALENV_SUFFIX=]}"
+  # Some versions of virtualenv (e.g the version bundled with 'uv') wrap the
+  # prompt in parentheses with a trailing space.
+  local venv_prompt="${(*)VIRTUAL_ENV_PROMPT:/#%(#b)\((*)\) /${match[1]}}"
+
+  if [ -z ${venv_prompt} ]; then
+    # Older versions of virtualenv do not set VIRTUAL_ENV_PROMPT, so fall back
+    # to the basename of the virtualenv path.
+    venv_prompt="${VIRTUAL_ENV:t}"
+  fi
+
+  echo "${ZSH_THEME_VIRTUALENV_PREFIX=[}${venv_prompt:gs/%/%%}${ZSH_THEME_VIRTUALENV_SUFFIX=]}"
 }
 
 # disables prompt mangling in virtual_env/bin/activate