fix: save cmdheight per-tabpage (#7)

lua/resession/init.lua

@@ -187,17 +187,21 @@ local function save(name, opts, target_tabpage)
       table.insert(data.buffers, buf)
     end
   end
+  local current_tabpage = vim.api.nvim_get_current_tabpage()
   local tabpages = target_tabpage and { target_tabpage } or vim.api.nvim_list_tabpages()
   for _, tabpage in ipairs(tabpages) do
+    vim.api.nvim_set_current_tabpage(tabpage)
     local tab = {}
     local tabnr = vim.api.nvim_tabpage_get_number(tabpage)
     if target_tabpage or vim.fn.haslocaldir(-1, tabnr) == 1 then
       tab.cwd = vim.fn.getcwd(-1, tabnr)
     end
+    tab.options = util.save_tab_options(tabpage)
     table.insert(data.tabs, tab)
     local winlayout = vim.fn.winlayout(tabnr)
     tab.wins = layout.add_win_info_to_layout(tabnr, winlayout)
   end
+  vim.api.nvim_set_current_tabpage(current_tabpage)
 
   for ext_name, ext_config in pairs(config.extensions) do
     local ext = util.get_extension(ext_name)
@@ -461,6 +465,9 @@ M.load = function(name, opts)
     if win then
       curwin = win
     end
+    if tab.options then
+      util.restore_tab_options(tab.options)
+    end
   end
   -- This can be nil if we saved a session in a window with an unsupported buffer
   if curwin then
@@ -482,10 +489,6 @@ M.load = function(name, opts)
     end
   end
 
-  -- We re-apply the options because sometimes the cmdheight gets messed up for some reason
-  for k, v in pairs(data.global.options) do
-    vim.o[k] = v
-  end
   current_session = nil
   if opts.reset then
     tab_sessions = {}

lua/resession/util.lua

@@ -50,6 +50,19 @@ M.save_buf_options = function(bufnr)
   return ret
 end
 
+---@param bufnr integer
+---@return table<string, any>
+M.save_tab_options = function(bufnr)
+  local ret = {}
+  -- 'cmdheight' is the only tab-local option, but the scope from nvim_get_option_info is incorrect
+  -- since there's no way to fetch a tabpage-local option, we rely on this being called from inside
+  -- the relevant tabpage
+  if vim.tbl_contains(config.options, "cmdheight") then
+    ret.cmdheight = vim.o.cmdheight
+  end
+  return ret
+end
+
 ---@param opts table<string, any>
 M.restore_global_options = function(opts)
   for opt, val in pairs(opts) do
@@ -82,6 +95,15 @@ M.restore_buf_options = function(bufnr, opts)
   end
 end
 
+---@param opts table<string, any>
+M.restore_tab_options = function(opts)
+  -- 'cmdheight' is the only tab-local option. See save_tab_options
+  if opts.cmdheight then
+    -- empirically, this seems to only set the local tab value
+    vim.o.cmdheight = opts.cmdheight
+  end
+end
+
 ---@param dirname? string
 ---@return string
 M.get_session_dir = function(dirname)