feat: user defined extensions

README.md

@@ -398,6 +398,17 @@ extensions = {'quickfix'}
 
 </details>
 
+<details>
+<summary><b>Custom extensions</b></summary>
+
+You can define your own extensions. If you think an extension might be useful for others then please submit a pr.
+```lua
+local my_extension = {sections = {lualine_a = 'mode'}, filetypes = {'lua'}}
+require'lualine'.setup {extensions = {my_extension}}
+```
+
+</details>
+
 ---
 ### Disabling lualine
 You can disable lualine for specific filetypes

doc/lualine.txt

@@ -313,13 +313,22 @@ You can load extensions with:
 >
     extensions = {'quickfix'}
 <
-Available extensions
+Available extensions~
     * |chadtree|
     * |fugitive|
     * |fzf|
     * |nerdtree|
     * |nvim-tree|
     * |quickfix|
+    *
+
+Custom extensions~
+
+You can define your own extensions.
+If you think an extension might be useful for others then please submit a pr.
+>
+    local my_extension = {sections = {lualine_a = 'mode'}, filetypes = {'lua'}}
+    require'lualine'.setup {extensions = {my_extension}}
 
 ------------------------------------------------------------------------------
 DISABLING LUALINE                                              *lualine-disable*

lua/lualine/utils/loader.lua

@@ -52,9 +52,14 @@ end
 
 local function load_extensions(config)
   for index, extension in pairs(config.extensions) do
-    local local_extension = require('lualine.extensions.' .. extension)
-    load_sections(local_extension.sections, config.options)
-    config.extensions[index] = local_extension
+    if type(extension) == 'string' then
+      local local_extension = require('lualine.extensions.' .. extension)
+      load_sections(local_extension.sections, config.options)
+      config.extensions[index] = local_extension
+    elseif type(extension) == 'table' then
+      load_sections(extension.sections, config.options)
+      config.extensions[index] = extension
+    end
   end
 end