Select stuff from list using curses terminal GUI

pyselector.py

from curses import *


def selector(a , stri):
	'''a poorly written selector CLI curses selector, works for python3'''
	for elements in a:
		if type(elements) != str:
				stdscr.refresh()
				endwin()
				return -1
	wah = []
	stdscr = initscr()
	stdscr.move(0,0)
	stdscr.keypad(True)
	noecho()
	printer = stdscr.addstr
	curs_set(0)

	max_row , max_cols = stdscr.getmaxyx()
	limit = max_row - 4

	def line_calc(string):
		div = len(string)/max_cols
		if len(string)%max_cols :
			div+=1
		return div

	printer = stdscr.addstr

	def mov_up(array,d_l):
		count = 0
		i = d_l
		output = ["\n"]
		while 1:
			count+=1
			count+= line_calc(array[i])
			if count > limit :
				break
			if (i) == (len(array) - 1):
				break
			i+=1
		u_l = i
		
		while d_l != (u_l + 1) :
			output.append(array[d_l])
			output.append("\n\n")
			d_l += 1

		return i , output

	def mid_printer(string , a = stdscr.getyx()[0]):
		printer(a , int((max_cols - len(string))/2) , string)

	#precaution when a==[]
	if a == []:
		mid_printer("No "+stri+" found" , 0)
		mid_printer("Press Enter to proceed or q to quit", 1)
		key = stdscr.getch()
		if key == 113:
			stdscr.refresh()
			endwin()
			return 0
		elif key == ord("\n"):
			stdscr.refresh()
			endwin()
			return []



	def mov_down(array, d_l):
		count = 0
		i = d_l
		output = ["\n"]
		while 1:
			count+=1
			count+= line_calc(array[i])
			if count > limit :
				break
			if (i) == 0:
				break
			i-=1
		u_l = i
		while u_l != (d_l + 1) :
			output.append(array[u_l])
			output.append("\n\n")
			u_l += 1

		return i , output

	up_l = 0 
	low_l, arr = mov_up(a , 0)
	vir_cur = 0


	def length(arrr):
		r = []
		for stuff in arrr:
			if ( stuff != "\n" ) and (stuff != "\n\n" ):
				r.append(stuff)
		return len(r)

	def highlighter(arrr , r , wah):
		count = 0
		printer("\n")
		for stuff in arrr:
			if ( stuff != "\n" ) and (stuff != "\n\n" ):
				if count == r :
					if stuff in wah:
						printer(stuff , A_REVERSE | A_UNDERLINE)
					else:
						printer(stuff , A_REVERSE)
					printer("\n\n")
					count += 1
				else:
					if stuff in wah:
						printer(stuff , A_UNDERLINE)
						printer("\n\n")
					else:
						printer(stuff)
						printer("\n\n")
					count += 1

		mid_printer(stri , max_row - 2)
		mid_printer("Space to select, q to quit and enter to proceed" , max_row - 1)

	def cleanup(the_list):
		cleaned_list = []
		for elements in the_list:
			if elements not in cleaned_list:
				cleaned_list.append(elements)
		return cleaned_list


	def adder(arrr , r, wah):
		count = 0
		printer("\n")
		for stuff in arrr:
			if ( stuff != "\n" ) and (stuff != "\n\n" ):
				if count == r :
					if stuff not in wah:
						wah.append(stuff)
					else:
						wah.remove(stuff)
					count += 1
				else:
					count += 1
		return wah
	ar_len = length(arr)
	highlighter(arr , vir_cur, wah)

	while 1:
		key = stdscr.getch()
		stdscr.clear()
		stdscr.move(0,0)
		if key == 113: #q
			stdscr.refresh()
			endwin()
			return 0
		elif key == KEY_DOWN:
			vir_cur += 1
			if vir_cur == ar_len:
				if low_l != len(a) - 1:
					low_l += 1
					up_l , arr = mov_down(a , low_l)
					ar_len = length(arr)
					vir_cur = ar_len - 1
					highlighter(arr , vir_cur, wah)
				else:
					vir_cur -= 1
					highlighter(arr , vir_cur, wah)
			else:
				highlighter(arr , vir_cur, wah)

		elif key == KEY_UP:
			vir_cur -= 1
			if vir_cur == -1 :
				if up_l != 0:
					up_l -= 1
					low_l , arr = mov_up(a , up_l)
					ar_len = length(arr)
					vir_cur = 0
					highlighter(arr , vir_cur, wah)
				else:
					vir_cur += 1
					highlighter(arr , vir_cur, wah)
			else:
				highlighter(arr , vir_cur, wah)
		elif key == ord(" "):
			wah = adder(arr , vir_cur, wah)
			stdscr.move(0,0)
			stdscr.clear()
			highlighter(arr , vir_cur, wah)
		elif key == ord("\n"):
			break
		else:
			stdscr.move(0,0)
			stdscr.clear()
			highlighter(arr , vir_cur, wah)

	stdscr.refresh()
	endwin()

	wah = cleanup(wah)
	return wah