feat: add resession extension

lua/aerial/window.lua

@@ -160,6 +160,10 @@ M.open_aerial_in_win = function(src_bufnr, src_winid, aer_winid)
   end
   setup_aerial_win(src_winid, aer_winid, aer_bufnr)
   vim.api.nvim_win_set_buf(aer_winid, aer_bufnr)
+  local backend = backends.get(src_bufnr)
+  if backend and not data:has_symbols(src_bufnr) then
+    backend.fetch_symbols(src_bufnr)
+  end
 end
 
 ---@param bufnr? integer

lua/resession/extensions/aerial.lua

@@ -0,0 +1,31 @@
+local window = require("aerial.window")
+local util = require("aerial.util")
+local M = {}
+
+M.on_save = function() end
+M.on_load = function() end
+
+M.is_win_supported = function(winid, bufnr)
+  return util.is_aerial_buffer(bufnr)
+end
+
+M.save_win = function(winid)
+  local source_win = util.get_source_win(winid)
+  local rel_nr = vim.api.nvim_win_get_number(source_win) - vim.api.nvim_win_get_number(winid)
+  local bufnr = util.get_source_buffer(vim.api.nvim_win_get_buf(winid))
+  return {
+    rel_nr = rel_nr,
+    bufname = vim.api.nvim_buf_get_name(bufnr),
+  }
+end
+
+M.load_win = function(winid, config)
+  local source_nr = vim.api.nvim_win_get_number(winid) + config.rel_nr
+  local source_win = vim.api.nvim_tabpage_list_wins(0)[source_nr]
+  vim.defer_fn(function()
+    local bufnr = vim.fn.bufadd(config.bufname)
+    window.open_aerial_in_win(bufnr, source_win, winid)
+  end, 5)
+end
+
+return M