nvim-config/lua/configs/session-manager.lua

local M = {}

function M.config()
	local status_ok, session_manager = pcall(require, "session_manager")
	if not status_ok then
		return
	end

	local sm_config = require'session_manager.config'
	local function get_branch_name()
		local handle = io.popen("git branch --show-current 2>/dev/null")
		if (handle == nil) then
			return nil
		end
		local branch = handle:read("l")
		handle:close()
		if (branch == nil) then
			return nil
		end
		branch = branch:gsub("/", "--")
		return branch
	end

	-- this plugin saves sessions for the working directory automatically
	session_manager.setup({
		autoload_mode = sm_config.AutoloadMode.Disabled, -- do not auto-load the last session at startup
		session_filename_to_dir = function(filename)
			local filename_without_extra = filename:sub(0, filename:find("=="))
			return sm_config.delimited_session_filename_to_dir(filename_without_extra)
		end,
		dir_to_session_filename = function(dir)
			local filename = sm_config.dir_to_delimited_session_filename(dir)
			local branch = get_branch_name()
			if branch ~= nil then
				return filename .. "==" .. branch
			else
				return filename
			end
		end,
	})
end

return M