?? prompt should be wrapped in paranthesis ??

src/virtualenv/activation/bash/activate.sh

@@ -63,7 +63,7 @@ fi
 if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT-}" ] ; then
     _OLD_VIRTUAL_PS1="${PS1-}"
     if [ "x__VIRTUAL_PROMPT__" != x ] ; then
-        PS1="__VIRTUAL_PROMPT__${PS1-}"
+        PS1="(__VIRTUAL_PROMPT__) ${PS1-}"
     else
         PS1="(`basename \"$VIRTUAL_ENV\"`) ${PS1-}"
     fi

src/virtualenv/activation/batch/activate.bat

@@ -14,7 +14,7 @@ if defined _OLD_VIRTUAL_PROMPT (
 )
 if not defined VIRTUAL_ENV_DISABLE_PROMPT (
     if "__VIRTUAL_PROMPT__" NEQ "" (
-        set "PROMPT=__VIRTUAL_PROMPT__%PROMPT%"
+        set "PROMPT=(__VIRTUAL_PROMPT__) %PROMPT%"
     ) else (
         for %%d in ("%VIRTUAL_ENV%") do set "PROMPT=(%%~nxd) %PROMPT%"
     )

src/virtualenv/activation/cshell/activate.csh

@@ -18,7 +18,7 @@ setenv PATH "$VIRTUAL_ENV:q/__BIN_NAME__:$PATH:q"
 
 
 if ('__VIRTUAL_PROMPT__' != "") then
-    set env_name = '__VIRTUAL_PROMPT__'
+    set env_name = '(__VIRTUAL_PROMPT__) '
 else
     set env_name = '('"$VIRTUAL_ENV:t:q"') '
 endif

src/virtualenv/activation/fish/activate.fish

@@ -88,7 +88,7 @@ if test -z "$VIRTUAL_ENV_DISABLE_PROMPT"
         # Prompt override provided?
         # If not, just prepend the environment name.
         if test -n '__VIRTUAL_PROMPT__'
-            printf '%s%s' '__VIRTUAL_PROMPT__' (set_color normal)
+            printf '%s%s' '(__VIRTUAL_PROMPT__) ' (set_color normal)
         else
             printf '%s(%s) ' (set_color normal) (basename "$VIRTUAL_ENV")
         end

src/virtualenv/activation/nushell/activate.nu

@@ -21,7 +21,7 @@ load-env $new-env
 
 # Creating the new prompt for the session
 let virtual_prompt = (if ("__VIRTUAL_PROMPT__" != "") {
-    "__VIRTUAL_PROMPT__"
+    "(__VIRTUAL_PROMPT__) "
 } {
     (build-string '(' ($virtual-env | path basename) ') ')
 }

src/virtualenv/activation/powershell/activate.ps1

@@ -46,7 +46,7 @@ if (!$env:VIRTUAL_ENV_DISABLE_PROMPT) {
         function global:prompt {
             # Add the custom prefix to the existing prompt
             $previous_prompt_value = & $function:_old_virtual_prompt
-            ("__VIRTUAL_PROMPT__" + $previous_prompt_value)
+            ("(__VIRTUAL_PROMPT__) " + $previous_prompt_value)
         }
     }
     else {