pass 1: get rid of obsolete modules

examples/text-objects.lua

@@ -1,4 +1,3 @@
-local Buffer = require 'u.buffer'
 local Pos = require 'u.pos'
 local Range = require 'u.range'
 local txtobj = require 'u.txtobj'
@@ -7,10 +6,10 @@ local M = {}
 
 function M.setup()
   -- Select whole file:
-  txtobj.define('ag', function() return Buffer.current():all() end)
+  txtobj.define('ag', function() return Range.from_buf_text(0) end)
 
   -- Select current line:
-  txtobj.define('a.', function() return Buffer.current():line(Pos.from_pos('.').lnum) end)
+  txtobj.define('a.', function() return Range.from_line(0, Pos.from_pos('.').lnum) end)
 
   -- Select the nearest quote:
   txtobj.define('aq', function() return Range.find_nearest_quotes() end)