test

-- ABC
-- DEF
local f = io.open ( require('shell').resolve ('test'),'r')

-- Works fine
f:seek('set',7)
print ( f:read('*line') )
f:seek('set',0)
print ( f:read('*line') )
f:close ()

local b = {
  ['resource']=nil,
  ['seek'] = {[1]=0},
  ['open'] = function ( self )
    self ['resource'] = io.open ( 'test', 'r' )
  end,
}
setmetatable ( b, {
  ['__index'] = function ( self, index )
    if self ['seek'][index] == nil then
      local tmpIndex = 1
      for i = index, 1, -1 do
        if self ['seek'][i] ~= nil then
          tmpIndex = i i = 0
        end
      end

      for i = tmpIndex, index, 1 do
        self ['resource']:seek ( 'set', self ['seek'][i] )
        local line = self ['resource']:read ('*line')
        self ['seek'][(i+1)] = self ['seek'][i] + #line + 1
      end
    end

    print ( 'seek', self['seek'][index] )
    self['resource']:seek ('set', self['seek'][index])
    return self['resource']:read('*line')
  end,
} )

b:open()
print ( b[2] )
print ( b[1] )