From f08e8514ddbe73cb02644cbd7b4b98e3681a7f9d Mon Sep 17 00:00:00 2001
From: shadmansaleh <shadmansaleh3@gmail.com>
Date: Sun, 2 May 2021 10:32:45 +0600
Subject: [PATCH 1/2] Clear old config before applying a new one

Options are reseted to defaults and other sections are cleared
---
 lua/lualine/init.lua | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lua/lualine/init.lua b/lua/lualine/init.lua
index aeca8b8..f6376f5 100644
--- a/lua/lualine/init.lua
+++ b/lua/lualine/init.lua
@@ -2,11 +2,17 @@
 -- MIT license, see LICENSE for more details.
 local utils_section = require('lualine.utils.section')
 local highlight = require('lualine.highlight')
-local config = require('lualine.defaults')
+local config = vim.deepcopy(require('lualine.defaults'))
 
 local function apply_configuration(config_table)
   if not config_table then return end
   local function parse_sections(section_group_name)
+    if section_group_name ~= 'options' then
+      config[section_group_name] = {} -- clear old config
+    else
+      -- reset options
+      config.options = vim.deepcopy(require'lualine.defaults'.options)
+    end
     if not config_table[section_group_name] then return end
     for section_name, section in pairs(config_table[section_group_name]) do
       config[section_group_name][section_name] =
@@ -26,7 +32,7 @@ local function apply_configuration(config_table)
   parse_sections('sections')
   parse_sections('inactive_sections')
   parse_sections('tabline')
-  if config_table.extensions then config.extensions = config_table.extensions end
+  config.extensions = config_table.extensions or {}
 end
 
 local function check_single_separator()

From 39102109b80b77ed43036401bbf39c9016c373a9 Mon Sep 17 00:00:00 2001
From: shadmansaleh <shadmansaleh3@gmail.com>
Date: Sun, 2 May 2021 10:33:25 +0600
Subject: [PATCH 2/2] Don't apply `g:lualine` config if config given to setup
 function

---
 lua/lualine/init.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lua/lualine/init.lua b/lua/lualine/init.lua
index f6376f5..1d76875 100644
--- a/lua/lualine/init.lua
+++ b/lua/lualine/init.lua
@@ -273,7 +273,9 @@ local function set_statusline()
 end
 
 local function setup(user_config)
-  apply_configuration(vim.g.lualine)
+  if not user_config then
+    apply_configuration(vim.g.lualine)
+  end
   apply_configuration(user_config)
   check_single_separator()
   setup_theme()