Support tilde as home path in the absolute file paths (#676)

* Support tile as home path in the absolute file paths

README.md

@@ -550,6 +550,7 @@ sections = {
       path = 0,                -- 0: Just the filename
                                -- 1: Relative path
                                -- 2: Absolute path
+                               -- 3: Absolute path, with tilde as the home directory
 
       shorting_target = 40,    -- Shortens path to leave 40 spaces in the window
                                -- for other components. (terrible name, any suggestions?)

lua/lualine/components/filename.lua

@@ -43,6 +43,9 @@ M.update_status = function(self)
   elseif self.options.path == 2 then
     -- absolute path
     data = vim.fn.expand('%:p')
+  elseif self.options.path == 3 then
+    -- absolute path, with tilde
+    data = vim.fn.expand('%:p:~')
   else
     -- just filename
     data = vim.fn.expand('%:t')