feat: support autosave on exit

Author: stevearc

README.md

@@ -5,7 +5,6 @@ A replacement for `:mksession` with a better API
 This is a work in progress
 
 TODO:
-- autosave on quit
 - periodic saving
 - tab-scoped sessions
 - hooks for plugins

lua/resession/config.lua

@@ -1,6 +1,9 @@
 local M = {}
 
 local default_config = {
+  -- Set this to save a session automatically when quitting vim
+  -- Can be a string or a function that returns a string
+  autosave_name = false,
   buffers = {
     buftypes = { "", "acwrite", "help" },
     options = { "buflisted" },
@@ -9,10 +12,25 @@ local default_config = {
 }
 
 M.setup = function(config)
+  local resession = require("resession")
   local newconf = vim.tbl_deep_extend("force", default_config, config)
   for k, v in pairs(newconf) do
     M[k] = v
   end
+
+  local autosave_group = vim.api.nvim_create_augroup("ResessionAutosave", { clear = true })
+  if newconf.autosave_name then
+    vim.api.nvim_create_autocmd("VimLeave", {
+      group = autosave_group,
+      callback = function()
+        local name = newconf.autosave_name
+        if type(name) == "function" then
+          name = name()
+        end
+        resession.save(name)
+      end,
+    })
+  end
 end
 
 return M

lua/resession/init.lua

@@ -1,8 +1,20 @@
 local M = {}
 
 local pending_config
+
+local function do_setup()
+  if pending_config then
+    require("resession.config").setup(pending_config)
+    pending_config = nil
+  end
+end
+
 M.setup = function(config)
   pending_config = config or {}
+  -- We have to complete the setup if we're autosaving
+  if pending_config.autosave_name then
+    do_setup()
+  end
 end
 
 ---@param name string
@@ -164,10 +176,7 @@ end
 for k, v in pairs(M) do
   if type(v) == "function" and k ~= "setup" then
     M[k] = function(...)
-      if pending_config then
-        require("resession.config").setup(pending_config)
-        pending_config = nil
-      end
+      do_setup()
       return v(...)
     end
   end