local component = require("component")
local event = require("event")
local fs = require("filesystem")
local keyboard = require("keyboard")
local shell = require("shell")
local term = require("term")
local text = require("text")
local unicode = require("unicode")
local sides = require("sides")
local colors=require("colors")
local line = " "

--getString:
--  Given a row and col, and an initial string, edit a string
--  len is the maximum number of characters allowed in the string
local function getString (row, col, start, len)
  local currLine = start
	if string.len(currLine) > 0 then
		currLine = currLine:gsub("^%s*(.-)%s*$", "%1")
	end
  local finished = false

  while not finished do
		local event, address, char, code, arg3 = event.pull()
		term.setCursor(col, row)
		if string.len(currLine) <= len then
			print(currLine)
		end
		if type(address) == "string" and component.isPrimary(address) then
			if event == "key_down" then
				if code == keyboard.keys.back then
					if string.len(currLine) > 0 then
						currLine = string.sub(currLine, 1, (string.len(currLine) - 1))
						if currPos > 0 then
							currPos = currPos - 1
						end
					end
				elseif code == keyboard.keys.enter then
					finished = true
				elseif not keyboard.isControl(char) then
					if string.len(currLine) < len then
						currLine = currLine..string.char(char)
					end
				end
			end
		end
	end
	return (currLine)
end

line = getString (5, 10, line, 30)
term.setCursor(7, 10)
print(line)