auto_save_to option added

autoload/xolox/session.vim

@@ -442,12 +442,17 @@ function! xolox#session#auto_save() " {{{2
     " We won't save the session if auto-save is explicitly disabled.
     return
   endif
-  " Get the name of the active session (if any).
-  let name = xolox#session#find_current_session()
-  " If no session is active and the user doesn't have any sessions yet, help
-  " them get started by suggesting to create the default session.
-  if empty(name) && (empty(xolox#session#get_names()) || g:session_default_overwrite)
-    let name = g:session_default_name
+  if empty(g:session_autosave_to)
+    " Get the name of the active session (if any).
+    let name = xolox#session#find_current_session()
+    " If no session is active and the user doesn't have any sessions yet, help
+    " them get started by suggesting to create the default session.
+    if empty(name) && (empty(xolox#session#get_names()) || g:session_default_overwrite)
+      let name = g:session_default_name
+    endif
+    " Prompt the user to save the active/first/default session?
+  else
+    let name = g:session_autosave_to
   endif
   " Prompt the user to save the active/first/default session?
   if !empty(name)

doc/session.txt

@@ -25,6 +25,7 @@ Contents ~
   5. The |g:session_extension| option
   6. The |g:session_autoload| option
   7. The |g:session_autosave| option
+  7. The |g:session_autosave_to| option
   8. The |g:session_autosave_periodic| option
   9. The |g:session_verbose_messages| option
   10. The |g:session_default_to_last| option
@@ -337,6 +338,16 @@ to your session. Set this option to "'yes'" to always automatically save open
 sessions when you quit Vim. To completely disable automatic saving you can set
 this option to "'no'".
 
+-------------------------------------------------------------------------------
+The *g:session_autosave_to* option
+
+If |g:session_autosave| equals "'yes'" and this option is different from "''",
+autosave always autosaves to a session with name |g:session_autosave_to| regardless
+of what the current session is or any other options. In particular,
+|g:session_default_overwrite| does not have any effect. If "''", autosave saves to
+the session name that would be used if this option did not exist. The default
+value is "''".
+
 -------------------------------------------------------------------------------
 The *g:session_autosave_periodic* option