From e9afeaf3a7bb645ca73980cd13048c48c292500c Mon Sep 17 00:00:00 2001
From: Folke Lemaitre <folke.lemaitre@gmail.com>
Date: Fri, 13 Oct 2023 07:57:09 +0200
Subject: [PATCH] feat: don't save the session when no files are open
 (save_empty = false)

---
 README.md                  |  1 +
 lua/persistence/config.lua |  3 ++-
 lua/persistence/init.lua   | 12 ++++++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a87d7be..a5b208c 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ Persistence comes with the following defaults:
   dir = vim.fn.expand(vim.fn.stdpath("state") .. "/sessions/"), -- directory where session files are saved
   options = { "buffers", "curdir", "tabpages", "winsize" }, -- sessionoptions used for saving
   pre_save = nil, -- a function to call before saving the session
+  save_empty = false, -- don't save if there are no open file buffers
 }
 ```
 
diff --git a/lua/persistence/config.lua b/lua/persistence/config.lua
index 41eb06e..3bc4b1b 100644
--- a/lua/persistence/config.lua
+++ b/lua/persistence/config.lua
@@ -4,7 +4,8 @@ local M = {}
 ---@field pre_save? fun()
 local defaults = {
   dir = vim.fn.expand(vim.fn.stdpath("state") .. "/sessions/"), -- directory where session files are saved
-  options = { "buffers", "curdir", "tabpages", "winsize" }, -- sessionoptions used for saving
+  options = { "buffers", "curdir", "tabpages", "winsize", "skiprtp" }, -- sessionoptions used for saving
+  save_empty = false, -- don't save if there are no open file buffers
 }
 
 ---@type PersistenceOptions
diff --git a/lua/persistence/init.lua b/lua/persistence/init.lua
index 7d01808..40f02be 100644
--- a/lua/persistence/init.lua
+++ b/lua/persistence/init.lua
@@ -34,6 +34,18 @@ function M.start()
         Config.options.pre_save()
       end
 
+      if not Config.options.save_empty then
+        local bufs = vim.tbl_filter(function(b)
+          if vim.bo[b].buftype ~= "" then
+            return false
+          end
+          return vim.api.nvim_buf_get_name(b) ~= ""
+        end, vim.api.nvim_list_bufs())
+        if #bufs == 0 then
+          return
+        end
+      end
+
       M.save()
     end,
   })