ncurses.py

import curses
from urllib.request import urlopen
import json
from time import sleep

fetch_todo = lambda: json.loads(urlopen("https://jsonplaceholder.typicode.com/todos").read())

stdscr = curses.initscr()

curses.noecho()
curses.cbreak()
curses.curs_set(0)

# Check for color support
if curses.has_colors():
    curses.start_color()

# Initialize the color pairs for future use
curses.init_pair(1, curses.COLOR_RED, curses.COLOR_BLACK)
curses.init_pair(2, curses.COLOR_GREEN, curses.COLOR_BLACK)
curses.init_pair(3, curses.COLOR_BLUE, curses.COLOR_BLACK)


# Top panel
stdscr.addstr("TODO:", curses.A_REVERSE)
stdscr.chgat(-1, curses.A_REVERSE)

# Bottom panel
stdscr.addstr(curses.LINES-1, 0, "Simple Terminal User Interface application for your To Do tasks")

# Change R to green
stdscr.chgat(curses.LINES-1, 7, 1, curses.A_BOLD | curses.color_pair(2))

# Set up the root window
root_window = curses.newwin(curses.LINES-2, curses.COLS, 1, 0)

# Set up the text window (subwin)
text_window = root_window.subwin(curses.LINES - 6, curses.COLS - 4, 3, 2)

# Draw a border around root window
root_window.box()

# Update the internal window data structures
stdscr.noutrefresh()
root_window.noutrefresh()

# Redraw the screen
curses.doupdate()

# Create the event loop
while 1:
    c = root_window.getch()

    if c == ord('r') or c == ord('R'):
        text_window.clear()
        text_window.addstr("Fetching data...", curses.color_pair(3))
        text_window.refresh()
        text_window.clear()
        data = fetch_todo()

        # Program will crash if you exceed available lines in the terminal
        for idx in range(5):
            template = ("\tTask ID: {}\n"
                 "\t\t- [{}] {}\n").format(data[idx]['id'], data[idx]['completed'], data[idx]['title'])

            text_window.addstr(template, curses.color_pair(1))
    elif c == ord('q') or c == ord('Q'):
        break
    
    # Refresh the windows from the bottom up
    stdscr.noutrefresh()
    root_window.noutrefresh
    text_window.noutrefresh()
    curses.doupdate()