Re: Output pagination

[Luiz Henrique de Figueiredo <lhf@...>]

> When I'm reading a long text file with LUA, Can I use pagination for
> splitting output?

Try the code below. Adjust d to your needs.
Use q to quit, f to page forward, b to page backward, enter to see the next line

-- page.lua
-- usage: lua page.lua file

function page(file)
  local f,err = io.open(file, "r")
  if f == nil then
	print(err)
	return
  end
  local lines = {}
  local n = 0
  for line in f:lines() do
	n = n + 1
	lines[n] = line
  end
  os.execute("stty cbreak </dev/tty >/dev/tty 2>&1")
  local b=1
  local d=10
  while true do
  	local e=math.min(n,b+d-1)
	for i=b,e do
  		print(i,lines[i])
	end
	io.write(":"); io.flush()
        local key = io.read(1)
	io.write("\n"); io.flush()
	if key == "q"  then break end
	if key == "b"  then b=math.max(1,b-d) end
	if key == "f"  then b=math.min(n,b+d) end
	if key == "\n" then b=math.min(n,b+1) end
  end
  os.execute("stty -cbreak </dev/tty >/dev/tty 2>&1");
end

page(arg[1])