ncurses two windows side-by-side

ledger-buffer.py

class Buffer(object):

    def __init__(self, window, lines):
        self.window = window
        self.lines = lines
        self.buffer = [""]

    def write(self, text):
        lines = text.split("\n")
        self.buffer[-1] += lines[0]
        self.buffer.extend(lines[1:])
        self.refresh()

    def writeln(self, text):
        self.write(text + "\n")

    def input(self, text = ""):
        return self._input(text, lambda: self.window.getstr().decode('utf-8'))

    def input_chr(self, text = ""):
        return self._input(text, lambda: chr(self.window.getch()))

    def _input(self, text, get_input):
        self.write(text)
        input = get_input()
        self.writeln(input)
        return input

    def refresh(self):
        self.window.clear()
        for nr, line in enumerate(self.buffer[-self.lines:]):
            self.window.addstr(nr, 0, line)

ledger-ledger.py

import argparse
import os
from ledger.actions import read_csv, complete_entries, read_ledger_accounts
from ledger.buffer import Buffer
import curses
import json

parser = argparse.ArgumentParser(description="Adds entries to a ledger file")
parser.add_argument('action')
parser.add_argument('input')

actions = {
    'parsecsv': read_csv
}

def run(stdscr):
    curses.echo()

    lines = int(os.environ['LINES'])
    columns = int(os.environ['COLUMNS'])

    half_width = int(columns / 2)

    left_window = curses.newwin(lines, half_width)
    left_buffer = Buffer(left_window, lines)

    right_window = curses.newwin(lines, half_width, 0, half_width + 2)
    right_buffer = Buffer(right_window, lines)

    args = parser.parse_args()
    input_filename = os.path.expanduser(args.input)
    if args.action == 'parsecsv':
        accounts = read_ledger_accounts(os.path.expanduser("~/Documents/boekhouding.dat"))

        right_buffer.writeln('Test')
        right_buffer.writeln(json.dumps(accounts))
        right_buffer.refresh()

        entries = read_csv(input_filename)
        entries = complete_entries(entries, left_buffer, right_buffer)
        #stdscr.refresh()

    right_buffer.input_chr()

ledger.py

#this is the startup file

from ledger import ledger
import curses

curses.wrapper(ledger.run)