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

   1 from http.server import BaseHTTPRequestHandler, HTTPServer
   2 import sys
   3 import os
   4 import html
   5 from urllib.parse import parse_qs, urlparse
   6 hostName = "localhost"
   7 serverPort = 8082
   8
   9
  10 class HandledException(Exception):
  11     pass
  12
  13
  14 def handled_error_exit(msg):
  15     print(f"ERROR: {msg}")
  16     sys.exit(1)
  17
  18
  19 def apply_booking_to_account_balances(account_sums, account, currency, amount):
  20     if not account in account_sums:
  21         account_sums[account] = {currency: amount}
  22     elif not currency in account_sums[account].keys():
  23         account_sums[account][currency] = amount
  24     else:
  25         account_sums[account][currency] += amount
  26
  27
  28 def add_taxes(lines):
  29     import decimal
  30     bookings, _ = parse_lines(lines)
  31     _, account_sums = bookings_to_account_tree(bookings)
  32     expenses_so_far = -1 * account_sums['Assets']['€']
  33     needed_income_before_krankenkasse = expenses_so_far
  34     ESt_this_month = 0
  35     left_over = needed_income_before_krankenkasse - ESt_this_month
  36     too_low = 0
  37     too_high = 2 * needed_income_before_krankenkasse
  38     E0 = 10908
  39     E1 = 15999
  40     E2 = 62809
  41     E3 = 277825
  42     while True:
  43         zvE = 12 * needed_income_before_krankenkasse
  44         if zvE < E0:
  45             ESt = decimal.Decimal(0)
  46         elif zvE < E1:
  47             y = (zvE - E0)/10000
  48             ESt = (decimal.Decimal(979.18) * y + 1400) * y
  49         elif zvE < E2:
  50             y = (zvE - E1)/10000
  51             ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
  52         elif zvE < E3:
  53             ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
  54         else:
  55             ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
  56         ESt_this_month = ESt / 12
  57         left_over = needed_income_before_krankenkasse - ESt_this_month
  58         if abs(left_over - expenses_so_far) < 0.1:
  59             break
  60         elif left_over < expenses_so_far:
  61             too_low = needed_income_before_krankenkasse
  62         elif left_over > expenses_so_far:
  63             too_high = needed_income_before_krankenkasse
  64         needed_income_before_krankenkasse = too_low + (too_high - too_low)/2
  65     line_income_tax = f'  Reserves:Einkommenssteuer  {ESt_this_month:.2f}€ ; expenses so far: {expenses_so_far:.2f}€; zvE: {zvE:.2f}€; ESt total: {ESt:.2f}€; needed before Krankenkasse: {needed_income_before_krankenkasse:.2f}€'
  66     kk_minimum_income = 1096.67
  67     kk_factor = decimal.Decimal(0.189)
  68     kk_minimum_tax = decimal.Decimal(207.27)
  69     # kk_minimum_income = 1131.67
  70     # kk_factor = decimal.Decimal(0.191)
  71     # kk_minimum_tax = decimal.Decimal(216.15)
  72     # kk_factor = decimal.Decimal(0.197)
  73     # kk_minimum_tax = decimal.Decimal(222.94)
  74     kk_add = max(0, kk_factor * needed_income_before_krankenkasse - kk_minimum_tax)
  75     line_kk_minimum = f'  Reserves:Month:Krankenkassendefaultbeitrag  {kk_minimum_tax:.2f}€  ; assed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}'
  76     line_kk_add = f'  Reserves:Month:Krankenkassenbeitragswachstum {kk_add:.2f}€  ; max(0, {kk_factor:.3f} * {needed_income_before_krankenkasse:.2f}€ - {kk_minimum_tax:.2f}€)'
  77     final_minus = expenses_so_far + ESt_this_month + kk_minimum_tax + kk_add
  78     line_finish = f'  Assets  -{final_minus:.2f}€'
  79     return [line_income_tax, line_kk_minimum, line_kk_add, line_finish]
  80
  81
  82 def bookings_to_account_tree(bookings):
  83     account_sums = {}
  84     for booking in bookings:
  85         for account, changes in booking.account_changes.items():
  86             for currency, amount in changes.items():
  87                 apply_booking_to_account_balances(account_sums, account, currency, amount)
  88     account_tree = {}
  89     def collect_branches(account_name, path):
  90         node = account_tree
  91         path_copy = path[:]
  92         while len(path_copy) > 0:
  93             step = path_copy.pop(0)
  94             node = node[step]
  95         toks = account_name.split(":", maxsplit=1)
  96         parent = toks[0]
  97         if parent in node.keys():
  98             child = node[parent]
  99         else:
 100             child = {}
 101             node[parent] = child
 102         if len(toks) == 2:
 103             k, v = collect_branches(toks[1], path + [parent])
 104             if k not in child.keys():
 105                 child[k] = v
 106             else:
 107                 child[k].update(v)
 108         return parent, child
 109     for account_name in sorted(account_sums.keys()):
 110         k, v = collect_branches(account_name, [])
 111         if k not in account_tree.keys():
 112             account_tree[k] = v
 113         else:
 114             account_tree[k].update(v)
 115     def collect_totals(parent_path, tree_node):
 116         for k, v in tree_node.items():
 117             child_path = parent_path + ":" + k
 118             for currency, amount in collect_totals(child_path, v).items():
 119                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
 120         return account_sums[parent_path]
 121     for account_name in account_tree.keys():
 122         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
 123     return account_tree, account_sums
 124
 125
 126 def parse_lines(lines):
 127     import datetime
 128     import decimal
 129     inside_booking = False
 130     date_string, description = None, None
 131     booking_lines = []
 132     start_line = 0
 133     bookings = []
 134     comments = []
 135     lines = lines.copy() + [''] # to ensure a booking-ending last line
 136     for i, line in enumerate(lines):
 137         prefix = f"line {i}"
 138         # we start with the case of an utterly empty line
 139         comments += [""]
 140         stripped_line = line.rstrip()
 141         if stripped_line == '':
 142             if inside_booking:
 143                 # assume we finished a booking, finalize, and commit to DB
 144                 if len(booking_lines) < 2:
 145                     raise HandledException(f"{prefix} booking ends to early")
 146                 booking = Booking(date_string, description, booking_lines, start_line)
 147                 bookings += [booking]
 148             # expect new booking to follow so re-zeroall booking data
 149             inside_booking = False
 150             date_string, description = None, None
 151             booking_lines = []
 152             continue
 153         # if non-empty line, first get comment if any, and commit to DB
 154         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
 155         if len(split_by_comment) == 2:
 156             comments[i] = split_by_comment[1].lstrip()
 157         # if pre-comment empty: if inside_booking, this must be a comment-only line so we keep it for later ledger-output to capture those comments; otherwise, no more to process for this line
 158         non_comment = split_by_comment[0].rstrip()
 159         if non_comment.rstrip() == '':
 160              if inside_booking:
 161                  booking_lines += ['']
 162              continue
 163         # if we're starting a booking, parse by first-line pattern
 164         if not inside_booking:
 165             start_line = i
 166             toks = non_comment.split(maxsplit=1)
 167             date_string = toks[0]
 168             try:
 169                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
 170             except ValueError:
 171                 raise HandledException(f"{prefix} bad date string: {date_string}")
 172             try:
 173                 description = toks[1]
 174             except IndexError:
 175                 raise HandledException(f"{prefix} bad description: {description}")
 176             inside_booking = True
 177             booking_lines += [non_comment]
 178             continue
 179         # otherwise, read as transfer data
 180         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 181         if len(toks) > 3:
 182             raise HandledException(f"{prefix} too many booking line tokens: {toks}")
 183         amount, currency = None, None
 184         account_name = toks[0]
 185         if account_name[0] == '[' and account_name[-1] == ']':
 186             # ignore specification's differentiation of "virtual" accounts
 187             account_name = account_name[1:-1]
 188         decimal_chars = ".-0123456789"
 189         if len(toks) == 3:
 190             i_currency = 1
 191             try:
 192                 amount = decimal.Decimal(toks[1])
 193                 i_currency = 2
 194             except decimal.InvalidOperation:
 195                 try:
 196                     amount = decimal.Decimal(toks[2])
 197                 except decimal.InvalidOperation:
 198                     raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
 199             currency = toks[i_currency]
 200             if currency[0] in decimal_chars:
 201                 raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 202         elif len(toks) == 2:
 203             value = toks[1]
 204             inside_amount = False
 205             inside_currency = False
 206             amount_string = ""
 207             currency = ""
 208             dots_counted = 0
 209             for i, c in enumerate(value):
 210                 if i == 0:
 211                     if c in decimal_chars:
 212                         inside_amount = True
 213                     else:
 214                         inside_currency = True
 215                 if inside_currency:
 216                     if c in decimal_chars and len(amount_string) == 0:
 217                         inside_currency = False
 218                         inside_amount = True
 219                     else:
 220                         currency += c
 221                         continue
 222                 if inside_amount:
 223                     if c not in decimal_chars:
 224                         if len(currency) > 0:
 225                             raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
 226                         inside_currency = True
 227                         inside_amount = False
 228                         currency += c
 229                         continue
 230                     if c == '-' and len(amount_string) > 1:
 231                         raise HandledException(f"{prefix} amount has non-start '-': {value}")
 232                     if c == '.':
 233                         if dots_counted > 1:
 234                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
 235                         dots_counted += 1
 236                     amount_string += c
 237             if len(amount_string) == 0:
 238                 raise HandledException(f"{prefix} amount missing: {value}")
 239             if len(currency) == 0:
 240                 raise HandledException(f"{prefix} currency missing: {value}")
 241             amount = decimal.Decimal(amount_string)
 242         booking_lines += [(account_name, amount, currency)]
 243     if inside_booking:
 244         raise HandledException(f"{prefix} last booking unfinished")
 245     return bookings, comments
 246
 247 class Booking:
 248
 249     def __init__(self, date_string, description, booking_lines, start_line):
 250         self.date_string = date_string
 251         self.description = description
 252         self.lines = booking_lines
 253         self.start_line = start_line
 254         self.validate_booking_lines()
 255         self.account_changes = self.parse_booking_lines_to_account_changes()
 256
 257     def validate_booking_lines(self):
 258         prefix = f"booking at line {self.start_line}"
 259         sums = {}
 260         empty_values = 0
 261         for line in self.lines[1:]:
 262             if line == '':
 263                 continue
 264             _, amount, currency = line
 265             if amount is None:
 266                 if empty_values > 0:
 267                     raise HandledException(f"{prefix} relates more than one empty value of same currency {currency}")
 268                 empty_values += 1
 269                 continue
 270             if currency not in sums:
 271                 sums[currency] = 0
 272             sums[currency] += amount
 273         if empty_values == 0:
 274             for k, v in sums.items():
 275                 if v != 0:
 276                     raise HandledException(f"{prefix} does not sum up to zero")
 277         else:
 278             sinkable = False
 279             for k, v in sums.items():
 280                 if v != 0:
 281                     sinkable = True
 282             if not sinkable:
 283                 raise HandledException(f"{prefix} has empty value that cannot be filled")
 284
 285     def parse_booking_lines_to_account_changes(self):
 286         account_changes = {}
 287         debt = {}
 288         sink_account = None
 289         for line in self.lines[1:]:
 290             if line == '':
 291                 continue
 292             account, amount, currency = line
 293             if amount is None:
 294                 sink_account = account
 295                 continue
 296             apply_booking_to_account_balances(account_changes, account, currency, amount)
 297             if currency not in debt:
 298                 debt[currency] = amount
 299             else:
 300                 debt[currency] += amount
 301         if sink_account:
 302             for currency, amount in debt.items():
 303                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 304         return account_changes
 305
 306
 307
 308 class Database:
 309
 310     def __init__(self):
 311         db_name = "_ledger"
 312         self.db_file = db_name + ".json"
 313         self.lock_file = db_name+ ".lock"
 314         self.bookings = []
 315         self.comments = []
 316         self.real_lines = []
 317         if os.path.exists(self.db_file):
 318             with open(self.db_file, "r") as f:
 319                 self.real_lines += f.readlines()
 320         ret = parse_lines(self.real_lines)
 321         self.bookings += ret[0]
 322         self.comments += ret[1]
 323
 324     def get_lines(self, start, end):
 325         return self.real_lines[start:end]
 326
 327     def replace(self, start, end, lines):
 328         import shutil
 329         if os.path.exists(self.lock_file):
 330             raise HandledException('Sorry, lock file!')
 331         if os.path.exists(self.db_file):
 332             shutil.copy(self.db_file, self.db_file + ".bak")
 333         f = open(self.lock_file, 'w+')
 334         f.close()
 335         text = ''.join(self.real_lines[:start]) + '\n'.join(lines) + ''.join(self.real_lines[end:])
 336         with open(self.db_file, 'w') as f:
 337             f.write(text);
 338         os.remove(self.lock_file)
 339
 340     def append(self, lines):
 341         import shutil
 342         if os.path.exists(self.lock_file):
 343             raise HandledException('Sorry, lock file!')
 344         if os.path.exists(self.db_file):
 345             shutil.copy(self.db_file, self.db_file + ".bak")
 346         f = open(self.lock_file, 'w+')
 347         f.close()
 348         with open(self.db_file, 'a') as f:
 349             f.write('\n' + '\n'.join(lines) + '\n');
 350         os.remove(self.lock_file)
 351
 352
 353 class MyServer(BaseHTTPRequestHandler):
 354     header = """<html>
 355 <meta charset="UTF-8">
 356 <style>
 357 body { color: #000000; }
 358 table { margin-bottom: 2em; }
 359 th, td { text-align: left }
 360 input[type=number] { text-align: right; font-family: monospace; }
 361 .money { font-family: monospace; text-align: right; }
 362 .comment { font-style: italic; color: #777777; }
 363 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 364 </style>
 365 <body>
 366 <a href="/ledger">ledger</a>
 367 <a href="/balance">balance</a>
 368 <a href="/add_free">add free</a>
 369 <a href="/add_structured">add structured</a>
 370 <hr />
 371 """
 372     footer = "</body>\n<html>"
 373
 374     def do_POST(self):
 375         db = Database()
 376         length = int(self.headers['content-length'])
 377         postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 378         parsed_url = urlparse(self.path)
 379         lines = []
 380         add_empty_line = None
 381         if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 382             date = postvars['date'][0]
 383             description = postvars['description'][0]
 384             start_comment = postvars['line_0_comment'][0]
 385             lines = [f'{date} {description} ; {start_comment}']
 386             if 'line_0_add' in postvars.keys():
 387                 add_empty_line = 0
 388             i = j = 1
 389             while f'line_{i}_comment' in postvars.keys():
 390                 if f'line_{i}_delete' in postvars.keys():
 391                     i += 1
 392                     continue
 393                 if f'line_{i}_add' in postvars.keys():
 394                     add_empty_line = j
 395                 account = postvars[f'line_{i}_account'][0]
 396                 amount = postvars[f'line_{i}_amount'][0]
 397                 currency = postvars[f'line_{i}_currency'][0]
 398                 comment = postvars[f'line_{i}_comment'][0]
 399                 i += 1
 400                 new_main = f'{account} {amount} {currency}'
 401                 if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines
 402                     continue
 403                 j += 1
 404                 new_line = new_main
 405                 if comment.rstrip() != '':
 406                     new_line += f' ; {comment}'
 407                 lines += [new_line]
 408             if 'add_taxes' in postvars.keys():
 409                 lines += add_taxes(lines)
 410         elif '/add_free' == parsed_url.path:
 411             lines = postvars['booking'][0].splitlines()
 412         lines += ['']  # to ensure Booking-ending last line
 413         start = int(postvars['start'][0])
 414         end = int(postvars['end'][0])
 415         try:
 416             _, _ = parse_lines(lines)
 417             if 'save' in postvars.keys():
 418                 if start == end == 0:
 419                     db.append(lines)
 420                 else:
 421                     db.replace(start, end, lines)
 422                 self.send_response(301)
 423                 redir_url = '/'
 424                 self.send_header('Location', redir_url)
 425                 self.end_headers()
 426             else:
 427                 page = self.header + self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line) + self.footer
 428                 self.send_response(200)
 429                 self.send_header("Content-type", "text/html")
 430                 self.end_headers()
 431                 self.wfile.write(bytes(page, "utf-8"))
 432         except HandledException as e:
 433             self.send_response(400)
 434             self.send_header("Content-type", "text/html")
 435             self.end_headers()
 436             page = f'{self.header}ERROR: {e}{self.footer}'
 437             self.wfile.write(bytes(page, "utf-8"))
 438
 439     def do_GET(self):
 440         self.send_response(200)
 441         self.send_header("Content-type", "text/html")
 442         self.end_headers()
 443         db = Database()
 444         parsed_url = urlparse(self.path)
 445         page = self.header + ''
 446         params = parse_qs(parsed_url.query)
 447         start = int(params.get('start', ['0'])[0])
 448         end = int(params.get('end', ['0'])[0])
 449         # bonus_lines = int(params.get('bonus_lines', ['0'])[0])
 450         if parsed_url.path == '/balance':
 451             page += self.balance_as_html(db)
 452         elif parsed_url.path == '/add_free':
 453             page += self.add_free(db, start, end)
 454         elif parsed_url.path == '/add_structured':
 455             page += self.add_structured(db, start, end)
 456         elif parsed_url.path == '/copy_free':
 457             page += self.add_free(db, start, end, copy=True)
 458         elif parsed_url.path == '/copy_structured':
 459             page += self.add_structured(db, start, end, copy=True)
 460         else:
 461             page += self.ledger_as_html(db)
 462         page += self.footer
 463         self.wfile.write(bytes(page, "utf-8"))
 464
 465     def balance_as_html(self, db):
 466         lines = []
 467         account_tree, account_sums = bookings_to_account_tree(db.bookings)
 468         def print_subtree(lines, indent, node, subtree, path):
 469             line = f"{indent}{node}"
 470             n_tabs = 5 - (len(line) // 8)
 471             line += n_tabs * "\t"
 472             if "€" in account_sums[path + node].keys():
 473                 amount = account_sums[path + node]["€"]
 474                 line += f"{amount:9.2f} €\t"
 475             else:
 476                 line += f"\t\t"
 477             for currency, amount in account_sums[path + node].items():
 478                 if currency != '€' and amount > 0:
 479                     line += f"{amount:5.2f} {currency}\t"
 480             lines += [line]
 481             indent += "  "
 482             for k, v in sorted(subtree.items()):
 483                 print_subtree(lines, indent, k, v, path + node + ":")
 484         for k, v in sorted(account_tree.items()):
 485             print_subtree(lines, "", k, v, "")
 486         content = "\n".join(lines)
 487         return f"<pre>{content}</pre>"
 488
 489     def ledger_as_html(self, db):
 490         lines = []
 491         for comment in db.comments:
 492             lines += [f'<span class="comment">{comment}</span>' if comment != '' else '']
 493         for booking in db.bookings:
 494             i = booking.start_line
 495             booking_end = booking.start_line + len(booking.lines)
 496             lines[i] = f"""<p>{booking.date_string} {booking.description} {lines[i]}
 497 [edit: <a href="/add_structured?start={booking.start_line}&end={booking_end}">structured</a>
 498 / <a href="/add_free?start={booking.start_line}&end={booking_end}">free</a>
 499 | copy:<a href="/copy_structured?start={booking.start_line}&end={booking_end}">structured</a>
 500 / <a href="/copy_free?start={booking.start_line}&end={booking_end}">free</a>]
 501 <table>"""
 502             for booking_line in booking.lines[1:]:
 503                 i += 1
 504                 if booking_line == '':
 505                     lines[i] = f'<tr><td><div class="full_line_comment">{lines[i]}</div></td></tr>'
 506                     continue
 507                 comment = f' {lines[i]}' if len(lines[i]) > 0 else ''
 508                 money = ''
 509                 if booking_line[1]:
 510                     money = f'{booking_line[1]} {booking_line[2]}'
 511                 account = booking_line[0]
 512                 lines[i] = f'<tr><td>{booking_line[0]}</td><td class="money">{money}</td><td>{comment}</td></tr>'
 513             lines[i] = lines[i] + "\n" + '</table></p>'
 514         return '\n'.join(lines)
 515
 516     def header_add_form(self, action):
 517         return f"<form method=\"POST\" action=\"/{action}\">\n"
 518
 519     def footer_add_form(self, start, end, copy):
 520         if copy:
 521             start = end = 0
 522         return f"""
 523 <input type="hidden" name="start" value={start} />
 524 <input type="hidden" name="end" value={end} />
 525 <input type="submit" name="save" value="save!">
 526 </form>"""
 527
 528     def textarea(self, name, lines, min_rows=1, min_cols=20):
 529         safe_content = html.escape(''.join(lines))
 530         n_rows = max(min_rows, len(lines))
 531         n_cols = min_cols
 532         for line in lines:
 533             n_cols = len(line) if len(line) > n_cols else n_cols
 534         return f'<textarea name="{name}" rows={n_rows} cols={n_cols}>{safe_content}</textarea>'
 535
 536     def add_free(self, db, start=0, end=0, copy=False):
 537         lines = db.get_lines(start, end)
 538         return f'{self.header_add_form("add_free")}{self.textarea("booking",lines,10,80)}{self.footer_add_form(start, end, copy)}'
 539
 540     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 541         import datetime
 542         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 543         bookings, comments = parse_lines(lines)
 544         if len(bookings) > 1:
 545             raise HandledException('can only edit single Booking')
 546         if add_empty_line is not None:
 547             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 548             booking = bookings[0]
 549             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 550         def inpu(name, val="", datalist="", input_type='text', size=-1):
 551             val = val if val is not None else ""
 552             safe_val = html.escape(str(val))
 553             datalist_string = '' if datalist == '' else f'list="{datalist}"'
 554             number_step = '' if input_type != 'number' else ' step=0.01'
 555             size_string = '' if size < 0 else f' size={size}'
 556             return f'<input type="{input_type}"{number_step} name="{name}"{size_string} value="{safe_val}" {datalist_string}/>'
 557         input_lines = inpu('check', 'check', '', 'submit') +\
 558                 inpu('revert', 'revert', '', 'submit') +\
 559                 inpu('add_taxes', 'add taxes', '', 'submit') +\
 560                 '<br />'
 561         today = str(datetime.datetime.now())[:10]
 562         if len(bookings) == 0:
 563             input_lines += f'{inpu("date", today, size=9)} {inpu("description", "", "descriptions")} ; {inpu("line_0_comment")} {inpu(f"line_0_add", "[+]", "", "submit")}<br />'
 564             for i in range(1, 3):
 565                 input_lines += f'{inpu(f"line_{i}_account", "", "accounts", size=40)} {inpu(f"line_{i}_amount", "", "", "number", size=10)} {inpu(f"line_{i}_currency", "", "currencies", size=3)} ; {self.textarea(f"line_{i}_comment", "")} {inpu(f"line_{i}_delete", "[x]", "", "submit")} {inpu(f"line_{i}_add", "[+]", "", "submit")}<br />'
 566         else:
 567             booking = bookings[0]
 568             last_line = len(comments)
 569             date_string = today if copy else booking.date_string
 570             input_lines += f'{inpu("date", date_string, size=9)} {inpu("description", booking.description, "descriptions")} ; {self.textarea("line_0_comment", [comments[0]])} {inpu(f"line_0_add", "[+]", "", "submit")}<br />'
 571             for i in range(1, len(comments)):
 572                 account = amount = currency = ''
 573                 if i < len(booking.lines) and booking.lines[i] != '':
 574                     account = booking.lines[i][0]
 575                     amount = booking.lines[i][1]
 576                     currency = booking.lines[i][2]
 577                 input_lines += f'{inpu(f"line_{i}_account", account, "accounts", size=40)} {inpu(f"line_{i}_amount", amount, "", "number", size=10)} {inpu(f"line_{i}_currency", currency, "currencies", size=3)} ; {self.textarea(f"line_{i}_comment", [comments[i]])} {inpu(f"line_{i}_delete", "[x]", "", "submit")} {inpu(f"line_{i}_add", "[+]", "", "submit")}<br />'
 578         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 579         for b in db.bookings:
 580             datalist_sets['descriptions'].add(b.description)
 581             for account, moneys in b.account_changes.items():
 582                 datalist_sets['accounts'].add(account)
 583                 for currency in moneys.keys():
 584                     datalist_sets['currencies'].add(currency)
 585         def build_datalist(name):
 586             datalist = f'<datalist id="{name}">' + "\n"
 587             for item in datalist_sets[name]:
 588                 safe_item = html.escape(item)
 589                 datalist += f'<option value="{safe_item}">{safe_item}</option>' + "\n"
 590             return f"{datalist}</datalist>\n"
 591         datalists = build_datalist('descriptions')
 592         datalists += build_datalist('accounts')
 593         datalists += build_datalist('currencies')
 594         return f'{self.header_add_form("add_structured")}{input_lines}{datalists}{self.footer_add_form(start, end, copy)}'
 595
 596
 597 if __name__ == "__main__":
 598     webServer = HTTPServer((hostName, serverPort), MyServer)
 599     print(f"Server started http://{hostName}:{serverPort}")
 600     try:
 601         webServer.serve_forever()
 602     except KeyboardInterrupt:
 603         pass
 604     webServer.server_close()
 605     print("Server stopped.")