plomlompom.com Git - misc/blob - ledger.py

   1 import os
   2 import decimal
   3 from datetime import datetime, timedelta
   4 from urllib.parse import parse_qs, urlparse
   5 from jinja2 import Environment as JinjaEnv, FileSystemLoader as JinjaFSLoader
   6 from plomlib import PlomDB, PlomException, run_server, PlomHandler
   7
   8 db_path = '/home/plom/org/ledger2024.dat'
   9 server_port = 8082
  10 j2env = JinjaEnv(loader=JinjaFSLoader('ledger_templates'))
  11
  12 class EditableException(PlomException):
  13     def __init__(self, booking_index, *args, **kwargs):
  14         self.booking_index = booking_index
  15         super().__init__(*args, **kwargs)
  16
  17
  18 class LedgerTextLine:
  19
  20     def __init__(self, text_line):
  21         self.text_line = text_line
  22         self.comment = ''
  23         split_by_comment = text_line.rstrip().split(sep=';', maxsplit=1)
  24         self.non_comment = split_by_comment[0].rstrip()
  25         self.empty = len(split_by_comment) == 1 and len(self.non_comment) == 0
  26         if self.empty:
  27             return
  28         if len(split_by_comment) == 2:
  29             self.comment = split_by_comment[1].lstrip()
  30
  31
  32 class Wealth:
  33
  34     def __init__(self):
  35         self.money_dict = {}
  36
  37     def __iadd__(self, moneys):
  38         money_dict = moneys
  39         if type(moneys) == Wealth:
  40             moneys = moneys.money_dict
  41         for currency, amount in moneys.items():
  42             if not currency in self.money_dict.keys():
  43                 self.money_dict[currency] = 0
  44             self.money_dict[currency] += amount
  45         return self
  46
  47     @property
  48     def sink_empty(self):
  49         return len(self.as_sink) == 0
  50
  51     @property
  52     def as_sink(self):
  53         sink = {}
  54         for currency, amount in self.money_dict.items():
  55             if 0 == amount:
  56                 continue
  57             sink[currency] = -amount
  58         return sink
  59
  60
  61 class Account:
  62
  63     def __init__(self, own_name, parent):
  64         self.own_name = own_name
  65         self.parent = parent
  66         if self.parent:
  67             self.parent.children += [self]
  68         self.own_moneys = Wealth()
  69         self.children = []
  70
  71     def add_wealth(self, moneys):
  72         self.own_moneys += moneys
  73
  74     @property
  75     def full_name(self):
  76         if self.parent and len(self.parent.own_name) > 0:
  77             return f'{self.parent.full_name}:{self.own_name}'
  78         else:
  79             return self.own_name
  80
  81     @property
  82     def full_moneys(self):
  83         full_moneys = Wealth()
  84         full_moneys += self.own_moneys
  85         for child in self.children:
  86             full_moneys += child.full_moneys
  87         return full_moneys
  88
  89
  90 def parse_lines_to_bookings(lines, ignore_editable_exceptions=False):
  91     lines = [LedgerTextLine(line) for line in lines]
  92     lines += [LedgerTextLine('')]  # to simulate ending of last booking
  93     bookings = []
  94     inside_booking = False
  95     booking_lines = []
  96     booking_start_i = 0
  97     last_date = ''
  98     for i, line in enumerate(lines):
  99         intro = f'file line {i}'
 100         if line.empty:
 101             if inside_booking:
 102                 booking = Booking(lines=booking_lines, starts_at=booking_start_i)
 103                 if last_date > booking.date and not ignore_editable_exceptions:
 104                     raise EditableException(len(bookings), f'{intro}: out-of-order date (follows {last_date})')
 105                 last_date = booking.date
 106                 bookings += [booking]
 107                 inside_booking =False
 108                 booking_lines = []
 109         else:
 110             if not inside_booking:
 111                 booking_start_i = i
 112             inside_booking = True
 113             booking_lines += [line]
 114     if inside_booking:
 115         raise PlomException(f'{intro}: last booking unfinished')
 116     return bookings
 117
 118
 119 class TransferLine:
 120
 121     def __init__(self, line=None, account='', amount=None, currency='', comment='', validate=True):
 122         self.account = account
 123         self.amount = amount
 124         self.currency = currency
 125         self.comment = comment
 126         if line:
 127             if line.empty:
 128                 raise PlomException('line empty')
 129             self.comment = line.comment
 130             toks = line.non_comment.split()
 131             if (len(toks) not in {1, 3}):
 132                 if validate:
 133                     raise PlomException(f'number of non-comment tokens not 1 or 3')
 134                 elif len(toks) == 2:
 135                     toks += ['']
 136                 else:
 137                     toks = 3*['']
 138             self.account = toks[0]
 139             if len(toks) != 1:
 140                 try:
 141                     self.amount = decimal.Decimal(toks[1])
 142                 except decimal.InvalidOperation:
 143                     if validate:
 144                         raise PlomException(f'invalid token for Decimal: {toks[1]}')
 145                     else:
 146                         self.comment = f'unparsed: {toks[1]}; {self.comment}'
 147                 self.currency = toks[2]
 148
 149     @property
 150     def amount_fmt(self):
 151         if self.amount is None:
 152             return ''
 153         elif self.amount.as_tuple().exponent < -2:
 154             return f'{self.amount:.1f}…'
 155         else:
 156             return f'{self.amount:.2f}'
 157
 158     @property
 159     def for_writing(self):
 160         line = f'  {self.account}'
 161         if self.amount is not None:
 162             line += f'  {self.amount} {self.currency}'
 163         if self.comment != '':
 164             line += f' ; {self.comment}'
 165         return line
 166
 167     @property
 168     def comment_cols(self):
 169         return max(20, len(self.comment))
 170
 171
 172 class Booking:
 173
 174     def __init__(self, lines=None, starts_at='?', date='', description='', top_comment='', transfer_lines=None, validate=True):
 175         self.validate = validate
 176         self.starts_at = starts_at
 177         self.intro = f'booking starting at line {self.starts_at}'
 178         self.clean()
 179         if lines:
 180             self.lines = lines
 181             self.parse_lines()
 182         else:
 183             self.date = date
 184             self.description = description
 185             self.top_comment = top_comment
 186             self.validate_head()
 187             self.transfer_lines = transfer_lines if transfer_lines else []
 188             if self.validate and len(self.transfer_lines) < 2:
 189                 raise PlomException(f'{self.intro}: too few transfer lines')
 190             self.calculate_account_changes()
 191             self.lines = [LedgerTextLine(l) for l in self.for_writing]
 192
 193     @classmethod
 194     def from_postvars(cls, postvars, starts_at='?', validate=True):
 195         date = postvars['date'][0]
 196         description = postvars['description'][0]
 197         top_comment = postvars['top_comment'][0]
 198         transfer_lines = []
 199         for i, account in enumerate(postvars['account']):
 200             if len(account) == 0:
 201                 continue
 202             amount = None
 203             if len(postvars['amount'][i]) > 0:
 204                 amount = decimal.Decimal(postvars['amount'][i])
 205             transfer_lines += [TransferLine(None, account, amount, postvars['currency'][i], postvars['comment'][i])]
 206         return cls(None, starts_at, date, description, top_comment, transfer_lines, validate=validate)
 207
 208     def clean(self):
 209         self.transfer_lines = []
 210         self.account_changes = {}
 211
 212     def parse_lines(self):
 213         if len(self.lines) < 3 and self.validate:
 214             raise PlomException(f'{self.intro}: ends with less than 3 lines:' + str(self.lines))
 215         top_line = self.lines[0]
 216         if top_line.empty and self.validate:
 217             raise PlomException('{self.intro}: headline empty')
 218         self.top_comment = top_line.comment
 219         toks = top_line.non_comment.split(maxsplit=1)
 220         if len(toks) < 2:
 221             if self.validate:
 222                 raise PlomException(f'{self.intro}: headline missing elements: {non_comment}')
 223             elif 0 == len(toks):
 224                 toks = 2*['']
 225             else:
 226                 toks += ['']
 227         self.date = toks[0]
 228         self.description = toks[1]
 229         self.validate_head()
 230         for i, line in enumerate(self.lines[1:]):
 231             try:
 232                 self.transfer_lines += [TransferLine(line, validate=self.validate)]
 233             except PlomException as e:
 234                 raise PlomException(f'{self.intro}, transfer line {i}: {e}')
 235         self.calculate_account_changes()
 236
 237     def calculate_account_changes(self):
 238         sink_account = None
 239         money_changes = Wealth()
 240         for i, transfer_line in enumerate(self.transfer_lines):
 241             intro = f'{self.intro}, transfer line {i}'
 242             if transfer_line.amount is None:
 243                 if sink_account is not None and self.validate:
 244                     raise PlomException(f'{intro}: second sink found (only one allowed)')
 245                 sink_account = transfer_line.account
 246             else:
 247                 if not transfer_line.account in self.account_changes.keys():
 248                     self.account_changes[transfer_line.account] = Wealth()
 249                 money = {transfer_line.currency: transfer_line.amount}
 250                 self.account_changes[transfer_line.account] += money
 251                 money_changes += money
 252         if sink_account is None and (not money_changes.sink_empty) and self.validate:
 253             raise PlomException(f'{intro}: does not balance (undeclared non-empty sink)')
 254         if sink_account is not None:
 255             if not sink_account in self.account_changes.keys():
 256                 self.account_changes[sink_account] = Wealth()
 257             self.account_changes[sink_account] += money_changes.as_sink
 258
 259     @property
 260     def for_writing(self):
 261         lines = [f'{self.date} {self.description}']
 262         if self.top_comment is not None and self.top_comment.rstrip() != '':
 263             lines[0] += f' ; {self.top_comment}'
 264         for line in self.transfer_lines:
 265             lines += [line.for_writing]
 266         return lines
 267
 268     @property
 269     def comment_cols(self):
 270         return max(20, len(self.top_comment))
 271
 272     def validate_head(self):
 273         if not self.validate:
 274             return
 275         if len(self.date) == 0:
 276             raise PlomException(f'{self.intro}: missing date')
 277         if len(self.description) == 0:
 278             raise PlomException(f'{self.intro}: missing description')
 279         try:
 280             datetime.strptime(self.date, '%Y-%m-%d')
 281         except ValueError:
 282             raise PlomException(f'{self.intro}: bad headline date format: {self.date}')
 283
 284     def fill_sink(self):
 285         replacement_lines = []
 286         for i, line in enumerate(self.transfer_lines):
 287             if line.amount is None:
 288                 for currency, amount in self.account_changes[line.account].money_dict.items():
 289                     replacement_lines += [TransferLine(None, f'{line.account}', amount, currency).for_writing]
 290                 break
 291         lines = self.lines[:i+1] + [LedgerTextLine(l) for l in replacement_lines] + self.lines[i+2:]
 292         self.clean()
 293         self.lines = lines
 294         self.parse_lines()
 295
 296     def mirror(self):
 297         new_transfer_lines = []
 298         for transfer_line in self.transfer_lines:
 299             uncommented_source = LedgerTextLine(transfer_line.for_writing).non_comment
 300             comment = f're: {uncommented_source.lstrip()}'
 301             new_account = '?'
 302             new_transfer_lines += [TransferLine(None, new_account, -transfer_line.amount, transfer_line.currency, comment)]
 303         for transfer_line in new_transfer_lines:
 304             self.lines += [LedgerTextLine(transfer_line.for_writing)]
 305         self.clean()
 306         self.parse_lines()
 307
 308     def replace(self, replace_from, replace_to):
 309         lines = []
 310         for l in self.for_writing:
 311             lines += [l.replace(replace_from, replace_to)]
 312         self.lines = [LedgerTextLine(l) for l in lines]
 313         self.clean()
 314         self.parse_lines()
 315
 316     def add_taxes(self, db):
 317         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
 318         acc_kk_minimum = 'Reserves:Monthly:KrankenkassenDefaultBeitrag'
 319         acc_kk = 'Expenses:KrankenKasse'
 320         acc_ESt = 'Reserves:EinkommensSteuer'
 321         acc_assets = 'Assets'
 322         acc_neuanfangspuffer_expenses = 'Reserves:NeuAnfangsPuffer:Ausgaben'
 323         months_passed = datetime.strptime(self.date, '%Y-%m-%d').month - 1
 324         past_kk_expenses = 0
 325         past_kk_add = 0
 326         past_neuanfangspuffer_expenses = 0
 327         for b in db.bookings:
 328             if b.date == self.date:
 329                 break
 330             if acc_neuanfangspuffer_expenses in b.account_changes.keys():
 331                 past_neuanfangspuffer_expenses -= b.account_changes[acc_neuanfangspuffer_expenses].money_dict['€']
 332             if acc_kk_add in b.account_changes.keys():
 333                 past_kk_add += b.account_changes[acc_kk_add].money_dict['€']
 334             if acc_kk_minimum in b.account_changes.keys():
 335                 past_kk_expenses += b.account_changes[acc_kk_minimum].money_dict['€']
 336
 337         needed_netto = -self.account_changes['Assets'].money_dict['€']
 338         past_taxed_needs_before_kk = past_neuanfangspuffer_expenses - past_kk_expenses
 339         ESt_this_month = 0
 340         E0 = decimal.Decimal(11604)
 341         E1 = decimal.Decimal(17006)
 342         E2 = decimal.Decimal(66761)
 343         E3 = decimal.Decimal(277826)
 344         taxed_income_before_kk = needed_netto
 345         too_low = 0
 346         too_high = 2 * needed_netto
 347         while True:
 348             estimate_for_remaining_year = (12 - months_passed) * taxed_income_before_kk
 349             zvE = past_taxed_needs_before_kk + estimate_for_remaining_year
 350             if zvE < E0:
 351                 ESt_year = decimal.Decimal(0)
 352             elif zvE < E1:
 353                 y = (zvE - E0)/10000
 354                 ESt_year = (decimal.Decimal(922.98) * y + 1400) * y
 355             elif zvE < E2:
 356                 y = (zvE - E1)/10000
 357                 ESt_year = (decimal.Decimal(181.19) * y + 2397) * y + decimal.Decimal(1025.38)
 358             elif zvE < E3:
 359                 ESt_year = decimal.Decimal(0.42) * zvE - 10602.13
 360             else:
 361                 ESt_year = decimal.Decimal(0.45) * zvE - 18936.88
 362             ESt_this_month = ESt_year / 12
 363             taxed_income_minus_ESt = taxed_income_before_kk - ESt_this_month
 364             if abs(taxed_income_minus_ESt - needed_netto) < 0.001:
 365                 break
 366             elif taxed_income_minus_ESt < needed_netto:
 367                 too_low = taxed_income_before_kk
 368             elif taxed_income_minus_ESt > needed_netto:
 369                 too_high = taxed_income_before_kk
 370             taxed_income_before_kk = too_low + (too_high - too_low)/2
 371         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
 372         comment = f'estimated zvE: {past_taxed_needs_before_kk}€ + {estimate_for_remaining_year:.2f}€ = {zvE:.2f}€ → year ESt: {ESt_year:.2f} → needed taxed income before Krankenkasse: {taxed_income_before_kk:.2f}€'
 373         self.transfer_lines += [TransferLine(None, acc_ESt, ESt_this_month, '€', comment)]
 374
 375         kk_factor = decimal.Decimal(1.197)
 376         kk_minimum_income = 1178.33
 377         kk_minimum_tax = decimal.Decimal(232.13).quantize(decimal.Decimal('0.00'))
 378         if self.date < '2024-02-01':
 379             kk_minimum_income = 1131.67
 380             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
 381         comment = f'assumed minimum income of {kk_minimum_income:.2f}€ * {kk_factor:.3f}'
 382         self.transfer_lines += [TransferLine(None, acc_kk_minimum, kk_minimum_tax, '€', comment)]
 383         kk_add = taxed_income_before_kk * kk_factor - taxed_income_before_kk - kk_minimum_tax
 384         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
 385         if past_kk_add + kk_add < 0:   # *if* kk_add would actually kill all earlier kk_add …
 386             kk_add = - past_kk_add     # … shrink it so it won't push the kk_add total below 0
 387             comment = f'local negative as large as possible without moving {acc_kk_add} below zero'
 388         else:
 389             comment = f'({taxed_income_before_kk:.2f}€ * {kk_factor:.3f}) - {taxed_income_before_kk:.2f} - {kk_minimum_tax}'
 390         self.transfer_lines += [TransferLine(None, acc_kk_add, kk_add, '€', comment)]
 391
 392         diff_through_taxes_and_kk = ESt_this_month + kk_minimum_tax + kk_add
 393         comment = f'{ESt_this_month} + {kk_minimum_tax} + {kk_add}'
 394         self.transfer_lines += [TransferLine(None, acc_assets, -diff_through_taxes_and_kk, '€', comment)]
 395         final_loss = diff_through_taxes_and_kk + needed_netto
 396         comment = f'{needed_netto} + {diff_through_taxes_and_kk}'
 397         self.transfer_lines += [TransferLine(None, acc_assets, final_loss, '€', comment)]
 398         self.transfer_lines += [TransferLine(None, acc_neuanfangspuffer_expenses, -final_loss, '€')]
 399
 400
 401 class LedgerDB(PlomDB):
 402
 403     def __init__(self, prefix, ignore_editable_exceptions=False):
 404         self.prefix = prefix
 405         self.bookings = []
 406         self.comments = []
 407         self.text_lines = []
 408         super().__init__(db_path)
 409         self.bookings = parse_lines_to_bookings(self.text_lines, ignore_editable_exceptions)
 410
 411     def read_db_file(self, f):
 412         self.text_lines += f.readlines()
 413
 414     def insert_booking_at_date(self, booking):
 415         place_at = 0
 416         if len(self.bookings) > 0:
 417             for i, iterated_booking in enumerate(self.bookings):
 418                 if booking.date < iterated_booking.date:
 419                     break
 420                 elif booking.date == iterated_booking.date:
 421                     place_at = i
 422                     break
 423                 else:
 424                     place_at = i + 1
 425         self.bookings.insert(place_at, booking)
 426
 427     def ledger_as_html(self):
 428         for index, booking in enumerate(self.bookings):
 429             booking.can_up = index > 0 and self.bookings[index - 1].date == booking.date
 430             booking.can_down = index < len(self.bookings) - 1 and self.bookings[index + 1].date == booking.date
 431         return j2env.get_template('ledger.html').render(bookings=self.bookings)
 432
 433     def balance_as_html(self, until_after=None):
 434         bookings = self.bookings[:(until_after if until_after is None else int(until_after)+1)]
 435         account_trunk = Account('', None)
 436         accounts = {account_trunk.full_name: account_trunk}
 437         for booking in bookings:
 438             for full_account_name, moneys in booking.account_changes.items():
 439                 toks = full_account_name.split(':')
 440                 path = []
 441                 for tok in toks:
 442                     parent_name = ':'.join(path)
 443                     path += [tok]
 444                     account_name = ':'.join(path)
 445                     if not account_name in accounts.keys():
 446                         accounts[account_name] = Account(own_name=tok, parent=accounts[parent_name])
 447                 accounts[full_account_name].add_wealth(moneys)
 448         class Node:
 449             def __init__(self, indent, name, moneys):
 450                 self.indent = indent
 451                 self.name = name
 452                 self.moneys = moneys.money_dict
 453         nodes = []
 454         def walk_tree(nodes, indent, account):
 455             nodes += [Node(indent, account.own_name, account.full_moneys)]
 456             for child in account.children:
 457                 walk_tree(nodes, indent+1, child)
 458         for acc in account_trunk.children:
 459             walk_tree(nodes, 0, acc)
 460         return j2env.get_template('balance.html').render(nodes=nodes)
 461
 462     def edit(self, index, sent=None, error_msg=None, edit_mode='table', copy=False):
 463         accounts = set()
 464         if sent or -1 == index:
 465             content = sent if sent else ([] if 'textarea'==edit_mode else None)
 466         else:
 467             content = self.bookings[index]
 468         date_today = str(datetime.now())[:10]
 469         if copy:
 470             content.date = date_today
 471         elif -1 == index and (content is None or [] == content):
 472             content = Booking(date=date_today, validate=False)
 473         if 'textarea' == edit_mode and content:
 474             content = content.for_writing
 475         else:
 476             for booking in self.bookings:
 477                 for transfer_line in booking.transfer_lines:
 478                     accounts.add(transfer_line.account)
 479         return j2env.get_template('edit.html').render(content=content, index=index, error_msg=error_msg, edit_mode=edit_mode, accounts=accounts, adding=(copy or -1 == index))
 480
 481     def move_up(self, index):
 482         return self.move(index, -1)
 483
 484     def move_down(self, index):
 485         return self.move(index, +1)
 486
 487     def move(self, index, direction):
 488         to_move = self.bookings[index]
 489         swap_index = index + 1*(direction)
 490         to_swap = self.bookings[swap_index]
 491         self.bookings[index] = to_swap
 492         self.bookings[index + 1*(direction)] = to_move
 493         return swap_index
 494
 495     def write_db(self):
 496         lines = []
 497         for i, booking in enumerate(self.bookings):
 498             if i > 0:
 499                 lines += ['']
 500             lines += booking.for_writing
 501         self.write_text_to_db('\n'.join(lines) + '\n')
 502
 503
 504 class LedgerHandler(PlomHandler):
 505
 506     def app_init(self, handler):
 507         default_path = '/ledger'
 508         handler.add_route('GET', default_path, self.forward_gets)
 509         handler.add_route('POST', default_path, self.forward_posts)
 510         return 'ledger', default_path
 511
 512     def do_POST(self):
 513         self.try_do(self.forward_posts)
 514
 515     def forward_posts(self):
 516         prefix = self.apps['ledger'] if hasattr(self, 'apps') else ''
 517         length = int(self.headers['content-length'])
 518         postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 519         db = LedgerDB(prefix, ignore_editable_exceptions=True)
 520         index = 0
 521         parsed_url = urlparse(self.path)
 522         for string in {'update', 'add', 'check', 'mirror', 'fill_sink', 'textarea', 'table', 'move_up', 'move_down', 'add_taxes', 'replace'}:
 523             if string in postvars.keys():
 524                 submit_button = string
 525                 break
 526         if f'{prefix}/ledger' == parsed_url.path and submit_button in {'move_up', 'move_down'}:
 527             mover = getattr(db, submit_button)
 528             index = mover(int(postvars[submit_button][0]))
 529         elif prefix + '/edit' == parsed_url.path:
 530             index = int(postvars['index'][0])
 531             edit_mode = postvars['edit_mode'][0]
 532             validate = submit_button in {'update', 'add', 'copy', 'check'}
 533             starts_at = '?' if index == -1 else db.bookings[index].starts_at
 534             if 'textarea' == edit_mode:
 535                 lines = [LedgerTextLine(line) for line in postvars['booking'][0].rstrip().split('\n')]
 536                 booking = Booking(lines, starts_at, validate=validate)
 537             else:
 538                 booking = Booking.from_postvars(postvars, starts_at, validate)
 539             if submit_button in {'update', 'add'}:
 540                 if submit_button == 'update':
 541                     if 'textarea' == edit_mode and 'delete' == ''.join([l.text_line for l in lines]).strip():
 542                        del db.bookings[index]
 543                     # if not creating new Booking, and date unchanged, keep it in place
 544                     elif booking.date == db.bookings[index].date:
 545                        db.bookings[index] = booking
 546                     else:
 547                        del db.bookings[index]
 548                        db.insert_booking_at_date(booking)
 549                 else:
 550                     db.insert_booking_at_date(booking)
 551             else:  # non-DB-writing calls
 552                 error_msg = None
 553                 if 'check' == submit_button:
 554                     error_msg = 'All looks fine!'
 555                 elif submit_button in {'mirror', 'fill_sink', 'add_taxes'}:
 556                     if 'add_taxes' == submit_button:
 557                         booking.add_taxes(db)
 558                     else:
 559                         getattr(booking, submit_button)()
 560                 elif 'replace' == submit_button:
 561                     booking.replace(postvars['replace_from'][0], postvars['replace_to'][0])
 562                 elif submit_button in {'textarea', 'table'}:
 563                     edit_mode = submit_button
 564                 page = db.edit(index, booking, error_msg=error_msg, edit_mode=edit_mode)
 565                 self.send_HTML(page)
 566                 return
 567         db.write_db()
 568         index = index if index >= 0 else len(db.bookings) - 1
 569         self.redirect(prefix + f'/ledger#{index}')
 570
 571     def do_GET(self):
 572         self.try_do(self.forward_gets)
 573
 574     def forward_gets(self):
 575         prefix = self.apps['ledger'] if hasattr(self, 'apps') else ''
 576         try:
 577             db = LedgerDB(prefix=prefix)
 578         except EditableException as e:
 579             # We catch the EditableException for further editing, and then
 580             # re-run the DB initiation without it blocking DB creation.
 581             db = LedgerDB(prefix=prefix, ignore_editable_exceptions=True)
 582             page = db.edit(index=e.booking_index, error_msg=f'ERROR: {e}')
 583             self.send_HTML(page)
 584             return
 585         parsed_url = urlparse(self.path)
 586         params = parse_qs(parsed_url.query)
 587         if parsed_url.path == f'{prefix}/balance':
 588             stop = params.get('until_after', [None])[0]
 589             page = db.balance_as_html(stop)
 590         elif parsed_url.path == f'{prefix}/edit':
 591             index = params.get('i', [-1])[0]
 592             copy = params.get('copy', [0])[0]
 593             page = db.edit(int(index), copy=bool(copy))
 594         else:
 595             page = db.ledger_as_html()
 596         self.send_HTML(page)
 597
 598
 599
 600 if __name__ == "__main__":
 601     run_server(server_port, LedgerHandler)