feat: added extension for trouble (#932)

* added extension for trouble

* add trouble extension to readme

README.md

@@ -899,6 +899,7 @@ extensions = {'quickfix'}
 - quickfix
 - symbols-outline
 - toggleterm
+- trouble
 
 #### Custom extensions
 

lua/lualine/extensions/trouble.lua

@@ -0,0 +1,22 @@
+local M = {}
+
+local function get_trouble_mode()
+  local opts = require('trouble.config').options
+
+  local words = vim.split(opts.mode, '[%W]')
+  for i, word in ipairs(words) do
+    words[i] = word:sub(1, 1):upper() .. word:sub(2)
+  end
+
+  return table.concat(words, ' ')
+end
+
+M.sections = {
+  lualine_a = {
+    get_trouble_mode,
+  },
+}
+
+M.filetypes = { 'Trouble' }
+
+return M