budget.py

#!/usr/bin/env python3
import yaml, requests, os, argparse

with open(os.path.expanduser("~/budget.yaml")) as f:
    data = yaml.load(f)

currency = data.get('settings', dict()).get('currency', None)

parser = argparse.ArgumentParser()
parser.add_argument("currency", default=currency, nargs=('?' if currency is not None else 1))

args = parser.parse_args()

for x in data.get("patreons", []):
    if x.get('amount', 0):
        if 'expenses' not in data:
            data['expenses'] = []
        data["expenses"].append(dict(amount=x["amount"], tax=23, currency="USD", description=x["name"], medium='Patreon'))

currencies = {x["currency"] for x in data["expenses"] if x.get("enabled",True)} | {x["currency"] for x in data["incomes"] if x.get("enabled", True)}
if 'patreons' in data:
    currencies.add('USD')

rates = requests.get("https://api.fixer.io/latest?base={base}&symbols={symbols}".format(base=args.currency, symbols=",".join(currencies))).json()["rates"]
print("1 {base}".format(base=args.currency)+"".join([" = {rate} {currency}".format(currency=x, rate=rates[x]) for x in rates]))
print()

for x in data["incomes"]:
    if x.get("enabled", True):
        x["taxed_amount"] = x["amount"]*(1+(x.get("tax", 0)/100.00))
        x["base_amount"] = x["taxed_amount"] if x["currency"] == args.currency else x["taxed_amount"]/rates[x["currency"]]
        print("+[{medium}] {description} - {amount:.2f} {currency} - {base_amount:.2f} {base_currency}".format(base_currency=args.currency, **x))

print()

for x in data["expenses"]:
    if x.get("enabled", True):
        x["taxed_amount"] = x["amount"]*(1+(x.get("tax", 0)/100.00))
        x["base_amount"] = x["taxed_amount"] if x["currency"] == args.currency else x["taxed_amount"]/rates[x["currency"]]
        print("-[{medium}] {description} - {amount:.2f} {currency} - {base_amount:.2f} {base_currency}".format(base_currency=args.currency, **x))

print()

total_in, total_out = sum([x["base_amount"] for x in data["incomes"] if x.get("enabled", True)]), sum([x["base_amount"] for x in data["expenses"] if x.get("enabled", True)])
print("+ {total_in:.2f} {currency}".format(total_in=total_in, currency=args.currency))
print("- {total_out:.2f} {currency}".format(total_out=total_out, currency=args.currency))
total = total_in - total_out
print("= {total:.2f} {currency}".format(total=total, currency=args.currency))

budget.yaml

settings:
  currency: PLN
patreons:
- name: Vic Nightfall
  amount: 1.00
expenses:
- amount: 4.00
  tax: 23
  currency: PLN
  medium: Aruba
  description: Aruba server
incomes:
- amount: 5.00
  currency: PLN
  medium: dad
  description: pocket money