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

   1 from http.server import BaseHTTPRequestHandler, HTTPServer
   2 import sys
   3 import os
   4 import html
   5 import jinja2
   6 from urllib.parse import parse_qs, urlparse
   7 hostName = "localhost"
   8 serverPort = 8082
   9
  10
  11 class HandledException(Exception):
  12     pass
  13
  14
  15 def handled_error_exit(msg):
  16     print(f"ERROR: {msg}")
  17     sys.exit(1)
  18
  19
  20 def apply_booking_to_account_balances(account_sums, account, currency, amount):
  21     if not account in account_sums:
  22         account_sums[account] = {currency: amount}
  23     elif not currency in account_sums[account].keys():
  24         account_sums[account][currency] = amount
  25     else:
  26         account_sums[account][currency] += amount
  27
  28
  29 def add_taxes(lines):
  30     import decimal
  31     bookings, _ = parse_lines(lines)
  32     _, account_sums = bookings_to_account_tree(bookings)
  33     expenses_so_far = -1 * account_sums['Assets']['€']
  34     needed_income_before_krankenkasse = expenses_so_far
  35     ESt_this_month = 0
  36     left_over = needed_income_before_krankenkasse - ESt_this_month
  37     too_low = 0
  38     too_high = 2 * needed_income_before_krankenkasse
  39     E0 = 10908
  40     E1 = 15999
  41     E2 = 62809
  42     E3 = 277825
  43     while True:
  44         zvE = 12 * needed_income_before_krankenkasse
  45         if zvE < E0:
  46             ESt = decimal.Decimal(0)
  47         elif zvE < E1:
  48             y = (zvE - E0)/10000
  49             ESt = (decimal.Decimal(979.18) * y + 1400) * y
  50         elif zvE < E2:
  51             y = (zvE - E1)/10000
  52             ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
  53         elif zvE < E3:
  54             ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
  55         else:
  56             ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
  57         ESt_this_month = ESt / 12
  58         left_over = needed_income_before_krankenkasse - ESt_this_month
  59         if abs(left_over - expenses_so_far) < 0.1:
  60             break
  61         elif left_over < expenses_so_far:
  62             too_low = needed_income_before_krankenkasse
  63         elif left_over > expenses_so_far:
  64             too_high = needed_income_before_krankenkasse
  65         needed_income_before_krankenkasse = too_low + (too_high - too_low)/2
  66     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}€'
  67     kk_minimum_income = 1096.67
  68     kk_factor = decimal.Decimal(0.189)
  69     kk_minimum_tax = decimal.Decimal(207.27)
  70     # kk_minimum_income = 1131.67
  71     # kk_factor = decimal.Decimal(0.191)
  72     # kk_minimum_tax = decimal.Decimal(216.15)
  73     # kk_factor = decimal.Decimal(0.197)
  74     # kk_minimum_tax = decimal.Decimal(222.94)
  75     kk_add = max(0, kk_factor * needed_income_before_krankenkasse - kk_minimum_tax)
  76     line_kk_minimum = f'  Reserves:Month:Krankenkassendefaultbeitrag  {kk_minimum_tax:.2f}€  ; assed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}'
  77     line_kk_add = f'  Reserves:Month:Krankenkassenbeitragswachstum {kk_add:.2f}€  ; max(0, {kk_factor:.3f} * {needed_income_before_krankenkasse:.2f}€ - {kk_minimum_tax:.2f}€)'
  78     final_minus = expenses_so_far + ESt_this_month + kk_minimum_tax + kk_add
  79     line_finish = f'  Assets  -{final_minus:.2f}€'
  80     return [line_income_tax, line_kk_minimum, line_kk_add, line_finish]
  81
  82
  83 def bookings_to_account_tree(bookings):
  84     account_sums = {}
  85     for booking in bookings:
  86         for account, changes in booking.account_changes.items():
  87             for currency, amount in changes.items():
  88                 apply_booking_to_account_balances(account_sums, account, currency, amount)
  89     account_tree = {}
  90     def collect_branches(account_name, path):
  91         node = account_tree
  92         path_copy = path[:]
  93         while len(path_copy) > 0:
  94             step = path_copy.pop(0)
  95             node = node[step]
  96         toks = account_name.split(":", maxsplit=1)
  97         parent = toks[0]
  98         if parent in node.keys():
  99             child = node[parent]
 100         else:
 101             child = {}
 102             node[parent] = child
 103         if len(toks) == 2:
 104             k, v = collect_branches(toks[1], path + [parent])
 105             if k not in child.keys():
 106                 child[k] = v
 107             else:
 108                 child[k].update(v)
 109         return parent, child
 110     for account_name in sorted(account_sums.keys()):
 111         k, v = collect_branches(account_name, [])
 112         if k not in account_tree.keys():
 113             account_tree[k] = v
 114         else:
 115             account_tree[k].update(v)
 116     def collect_totals(parent_path, tree_node):
 117         for k, v in tree_node.items():
 118             child_path = parent_path + ":" + k
 119             for currency, amount in collect_totals(child_path, v).items():
 120                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
 121         return account_sums[parent_path]
 122     for account_name in account_tree.keys():
 123         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
 124     return account_tree, account_sums
 125
 126
 127 def parse_lines(lines):
 128     import datetime
 129     import decimal
 130     inside_booking = False
 131     date_string, description = None, None
 132     booking_lines = []
 133     start_line = 0
 134     bookings = []
 135     comments = []
 136     lines = lines.copy() + [''] # to ensure a booking-ending last line
 137     for i, line in enumerate(lines):
 138         prefix = f"line {i}"
 139         # we start with the case of an utterly empty line
 140         comments += [""]
 141         stripped_line = line.rstrip()
 142         if stripped_line == '':
 143             if inside_booking:
 144                 # assume we finished a booking, finalize, and commit to DB
 145                 if len(booking_lines) < 2:
 146                     raise HandledException(f"{prefix} booking ends to early")
 147                 booking = Booking(date_string, description, booking_lines, start_line)
 148                 bookings += [booking]
 149             # expect new booking to follow so re-zeroall booking data
 150             inside_booking = False
 151             date_string, description = None, None
 152             booking_lines = []
 153             continue
 154         # if non-empty line, first get comment if any, and commit to DB
 155         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
 156         if len(split_by_comment) == 2:
 157             comments[i] = split_by_comment[1].lstrip()
 158         # 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
 159         non_comment = split_by_comment[0].rstrip()
 160         if non_comment.rstrip() == '':
 161              if inside_booking:
 162                  booking_lines += ['']
 163              continue
 164         # if we're starting a booking, parse by first-line pattern
 165         if not inside_booking:
 166             start_line = i
 167             toks = non_comment.split(maxsplit=1)
 168             date_string = toks[0]
 169             try:
 170                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
 171             except ValueError:
 172                 raise HandledException(f"{prefix} bad date string: {date_string}")
 173             try:
 174                 description = toks[1]
 175             except IndexError:
 176                 raise HandledException(f"{prefix} bad description: {description}")
 177             inside_booking = True
 178             booking_lines += [non_comment]
 179             continue
 180         # otherwise, read as transfer data
 181         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 182         if len(toks) > 3:
 183             raise HandledException(f"{prefix} too many booking line tokens: {toks}")
 184         amount, currency = None, None
 185         account_name = toks[0]
 186         if account_name[0] == '[' and account_name[-1] == ']':
 187             # ignore specification's differentiation of "virtual" accounts
 188             account_name = account_name[1:-1]
 189         decimal_chars = ".-0123456789"
 190         if len(toks) == 3:
 191             i_currency = 1
 192             try:
 193                 amount = decimal.Decimal(toks[1])
 194                 i_currency = 2
 195             except decimal.InvalidOperation:
 196                 try:
 197                     amount = decimal.Decimal(toks[2])
 198                 except decimal.InvalidOperation:
 199                     raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
 200             currency = toks[i_currency]
 201             if currency[0] in decimal_chars:
 202                 raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 203         elif len(toks) == 2:
 204             value = toks[1]
 205             inside_amount = False
 206             inside_currency = False
 207             amount_string = ""
 208             currency = ""
 209             dots_counted = 0
 210             for i, c in enumerate(value):
 211                 if i == 0:
 212                     if c in decimal_chars:
 213                         inside_amount = True
 214                     else:
 215                         inside_currency = True
 216                 if inside_currency:
 217                     if c in decimal_chars and len(amount_string) == 0:
 218                         inside_currency = False
 219                         inside_amount = True
 220                     else:
 221                         currency += c
 222                         continue
 223                 if inside_amount:
 224                     if c not in decimal_chars:
 225                         if len(currency) > 0:
 226                             raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
 227                         inside_currency = True
 228                         inside_amount = False
 229                         currency += c
 230                         continue
 231                     if c == '-' and len(amount_string) > 1:
 232                         raise HandledException(f"{prefix} amount has non-start '-': {value}")
 233                     if c == '.':
 234                         if dots_counted > 1:
 235                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
 236                         dots_counted += 1
 237                     amount_string += c
 238             if len(amount_string) == 0:
 239                 raise HandledException(f"{prefix} amount missing: {value}")
 240             if len(currency) == 0:
 241                 raise HandledException(f"{prefix} currency missing: {value}")
 242             amount = decimal.Decimal(amount_string)
 243         booking_lines += [(account_name, amount, currency)]
 244     if inside_booking:
 245         raise HandledException(f"{prefix} last booking unfinished")
 246     return bookings, comments
 247
 248
 249 class Booking:
 250
 251     def __init__(self, date_string, description, booking_lines, start_line):
 252         self.date_string = date_string
 253         self.description = description
 254         self.lines = booking_lines
 255         self.start_line = start_line
 256         self.validate_booking_lines()
 257         self.account_changes = self.parse_booking_lines_to_account_changes()
 258
 259     def validate_booking_lines(self):
 260         prefix = f"booking at line {self.start_line}"
 261         sums = {}
 262         empty_values = 0
 263         for line in self.lines[1:]:
 264             if line == '':
 265                 continue
 266             _, amount, currency = line
 267             if amount is None:
 268                 if empty_values > 0:
 269                     raise HandledException(f"{prefix} relates more than one empty value of same currency {currency}")
 270                 empty_values += 1
 271                 continue
 272             if currency not in sums:
 273                 sums[currency] = 0
 274             sums[currency] += amount
 275         if empty_values == 0:
 276             for k, v in sums.items():
 277                 if v != 0:
 278                     raise HandledException(f"{prefix} does not sum up to zero")
 279         else:
 280             sinkable = False
 281             for k, v in sums.items():
 282                 if v != 0:
 283                     sinkable = True
 284             if not sinkable:
 285                 raise HandledException(f"{prefix} has empty value that cannot be filled")
 286
 287     def parse_booking_lines_to_account_changes(self):
 288         account_changes = {}
 289         debt = {}
 290         sink_account = None
 291         for line in self.lines[1:]:
 292             if line == '':
 293                 continue
 294             account, amount, currency = line
 295             if amount is None:
 296                 sink_account = account
 297                 continue
 298             apply_booking_to_account_balances(account_changes, account, currency, amount)
 299             if currency not in debt:
 300                 debt[currency] = amount
 301             else:
 302                 debt[currency] += amount
 303         if sink_account:
 304             for currency, amount in debt.items():
 305                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 306         return account_changes
 307
 308
 309
 310 class Database:
 311
 312     def __init__(self):
 313         db_name = "_ledger"
 314         self.db_file = db_name + ".json"
 315         self.lock_file = db_name+ ".lock"
 316         self.bookings = []
 317         self.comments = []
 318         self.real_lines = []
 319         if os.path.exists(self.db_file):
 320             with open(self.db_file, "r") as f:
 321                 self.real_lines += [l.rstrip() for l in f.readlines()]
 322         ret = parse_lines(self.real_lines)
 323         self.bookings += ret[0]
 324         self.comments += ret[1]
 325
 326     def get_lines(self, start, end):
 327         return self.real_lines[start:end]
 328
 329     def replace(self, start, end, lines):
 330         import shutil
 331         if os.path.exists(self.lock_file):
 332             raise HandledException('Sorry, lock file!')
 333         if os.path.exists(self.db_file):
 334             shutil.copy(self.db_file, self.db_file + ".bak")
 335         f = open(self.lock_file, 'w+')
 336         f.close()
 337         total_lines = self.real_lines[:start] + lines + self.real_lines[end:]
 338         text = '\n'.join(total_lines)
 339         with open(self.db_file, 'w') as f:
 340             f.write(text);
 341         os.remove(self.lock_file)
 342
 343     def append(self, lines):
 344         import shutil
 345         if os.path.exists(self.lock_file):
 346             raise HandledException('Sorry, lock file!')
 347         if os.path.exists(self.db_file):
 348             shutil.copy(self.db_file, self.db_file + ".bak")
 349         f = open(self.lock_file, 'w+')
 350         f.close()
 351         with open(self.db_file, 'a') as f:
 352             f.write('\n\n' + '\n'.join(lines) + '\n\n');
 353         os.remove(self.lock_file)
 354
 355
 356 class MyServer(BaseHTTPRequestHandler):
 357     header = """<html>
 358 <meta charset="UTF-8">
 359 <style>
 360 body { color: #000000; }
 361 table { margin-bottom: 2em; }
 362 th, td { text-align: left }
 363 input[type=number] { text-align: right; font-family: monospace; }
 364 .money { font-family: monospace; text-align: right; }
 365 .comment { font-style: italic; color: #777777; }
 366 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 367 </style>
 368 <body>
 369 <a href="/ledger">ledger</a>
 370 <a href="/balance">balance</a>
 371 <a href="/add_free">add free</a>
 372 <a href="/add_structured">add structured</a>
 373 <hr />
 374 """
 375     footer = "</body>\n<html>"
 376
 377     def do_POST(self):
 378         db = Database()
 379         length = int(self.headers['content-length'])
 380         postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 381         parsed_url = urlparse(self.path)
 382         lines = []
 383         add_empty_line = None
 384         if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 385             date = postvars['date'][0]
 386             description = postvars['description'][0]
 387             start_comment = postvars['line_0_comment'][0]
 388             lines = [f'{date} {description} ; {start_comment}']
 389             if 'line_0_add' in postvars.keys():
 390                 add_empty_line = 0
 391             i = j = 1
 392             while f'line_{i}_comment' in postvars.keys():
 393                 if f'line_{i}_delete' in postvars.keys():
 394                     i += 1
 395                     continue
 396                 if f'line_{i}_add' in postvars.keys():
 397                     add_empty_line = j
 398                 account = postvars[f'line_{i}_account'][0]
 399                 amount = postvars[f'line_{i}_amount'][0]
 400                 currency = postvars[f'line_{i}_currency'][0]
 401                 comment = postvars[f'line_{i}_comment'][0]
 402                 i += 1
 403                 new_main = f'{account} {amount} {currency}'
 404                 if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines
 405                     continue
 406                 j += 1
 407                 new_line = new_main
 408                 if comment.rstrip() != '':
 409                     new_line += f' ; {comment}'
 410                 lines += [new_line]
 411             if 'add_taxes' in postvars.keys():
 412                 lines += add_taxes(lines)
 413         elif '/add_free' == parsed_url.path:
 414             lines = postvars['booking'][0].splitlines()
 415         start = int(postvars['start'][0])
 416         end = int(postvars['end'][0])
 417         try:
 418             _, _ = parse_lines(lines)
 419             if 'save' in postvars.keys():
 420                 if start == end == 0:
 421                     db.append(lines)
 422                 else:
 423                     db.replace(start, end, lines)
 424                 self.send_response(301)
 425                 redir_url = '/'
 426                 self.send_header('Location', redir_url)
 427                 self.end_headers()
 428             else:
 429                 page = self.header + self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line) + self.footer
 430                 self.send_response(200)
 431                 self.send_header("Content-type", "text/html")
 432                 self.end_headers()
 433                 self.wfile.write(bytes(page, "utf-8"))
 434         except HandledException as e:
 435             self.send_response(400)
 436             self.send_header("Content-type", "text/html")
 437             self.end_headers()
 438             page = f'{self.header}ERROR: {e}{self.footer}'
 439             self.wfile.write(bytes(page, "utf-8"))
 440
 441     def do_GET(self):
 442         self.send_response(200)
 443         self.send_header("Content-type", "text/html")
 444         self.end_headers()
 445         db = Database()
 446         parsed_url = urlparse(self.path)
 447         page = self.header + ''
 448         params = parse_qs(parsed_url.query)
 449         start = int(params.get('start', ['0'])[0])
 450         end = int(params.get('end', ['0'])[0])
 451         if parsed_url.path == '/balance':
 452             page += self.balance_as_html(db)
 453         elif parsed_url.path == '/add_free':
 454             page += self.add_free(db, start, end)
 455         elif parsed_url.path == '/add_structured':
 456             page += self.add_structured(db, start, end)
 457         elif parsed_url.path == '/copy_free':
 458             page += self.add_free(db, start, end, copy=True)
 459         elif parsed_url.path == '/copy_structured':
 460             page += self.add_structured(db, start, end, copy=True)
 461         else:
 462             page += self.ledger_as_html(db)
 463         page += self.footer
 464         self.wfile.write(bytes(page, "utf-8"))
 465
 466     def balance_as_html(self, db):
 467         lines = []
 468         account_tree, account_sums = bookings_to_account_tree(db.bookings)
 469         def print_subtree(lines, indent, node, subtree, path):
 470             line = f"{indent}{node}"
 471             n_tabs = 5 - (len(line) // 8)
 472             line += n_tabs * "\t"
 473             if "€" in account_sums[path + node].keys():
 474                 amount = account_sums[path + node]["€"]
 475                 line += f"{amount:9.2f} €\t"
 476             else:
 477                 line += f"\t\t"
 478             for currency, amount in account_sums[path + node].items():
 479                 if currency != '€' and amount > 0:
 480                     line += f"{amount:5.2f} {currency}\t"
 481             lines += [line]
 482             indent += "  "
 483             for k, v in sorted(subtree.items()):
 484                 print_subtree(lines, indent, k, v, path + node + ":")
 485         for k, v in sorted(account_tree.items()):
 486             print_subtree(lines, "", k, v, "")
 487         content = "\n".join(lines)
 488         return f"<pre>{content}</pre>"
 489
 490     def ledger_as_html(self, db):
 491         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')
 492         booking_tmpl = jinja2.Template("""
 493 <p>{{date}} {{desc}} <span class="comment">{{head_comment|e}}</span>
 494 [edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
 495 / <a href="/add_free?start={{start}}&end={{end}}">free</a>
 496 | copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
 497 / <a href="/copy_free?start={{start}}&end={{end}}">free</a>]
 498 <table>
 499 {% for l in booking_lines %}
 500 {% if l.acc %}
 501 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
 502 {% else %}
 503 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
 504 {% endif %}
 505 {% endfor %}
 506 </table></p>
 507 """)
 508         elements_to_write = []
 509         last_i = i = 0
 510         for booking in db.bookings:
 511             i = booking.start_line
 512             elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']
 513             booking_end = last_i = booking.start_line + len(booking.lines)
 514             booking_lines = []
 515             for booking_line in booking.lines[1:]:
 516                 i += 1
 517                 comment = db.comments[i]
 518                 if booking_line == '':
 519                     booking_lines += [{'acc': None, 'money': None, 'comment': comment}]
 520                     continue
 521                 money = ''
 522                 if booking_line[1]:
 523                     money = f'{booking_line[1]} {booking_line[2]}'
 524                 account = booking_line[0]
 525                 booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]
 526             elements_to_write += [booking_tmpl.render(
 527                 start=booking.start_line,
 528                 end=booking_end,
 529                 date=booking.date_string,
 530                 desc=booking.description,
 531                 head_comment=db.comments[booking.start_line],
 532                 booking_lines = booking_lines)]
 533         return '\n'.join(elements_to_write)
 534
 535     def add_free(self, db, start=0, end=0, copy=False):
 536         tmpl = jinja2.Template("""
 537 <form method="POST" action="{{action}}">
 538 <textarea name="booking" rows=10 cols=80>
 539 {% for line in lines %}{{ line }}
 540 {% endfor %}
 541 </textarea>
 542 <input type="hidden" name="start" value={{start}} />
 543 <input type="hidden" name="end" value={{end}} />
 544 <input type="submit" name="save" value="save!">
 545 </form>
 546 """)
 547         lines = db.get_lines(start, end)
 548         if copy:
 549             start = end = 0
 550         return tmpl.render(start=start, end=end, lines=lines)
 551
 552     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 553         tmpl = jinja2.Template("""
 554 <form method="POST" action="{{action|e}}">
 555 <input type="submit" name="check" value="check" />
 556 <input type="submit" name="revert" value="revert" />
 557 <input type="submit" name="add_taxes" value="add taxes" />
 558 <br />
 559 <input name="date" value="{{date|e}}" size=9 />
 560 <input name="description" value="{{desc|e}}" list="descriptions" />
 561 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
 562 <input type="submit" name="line_0_add" value="[+]" />
 563 <br />
 564 {% for line in booking_lines %}
 565 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
 566 <input type="number" name="line_{{line.i}}_amount" value="{{line.amt}}" size=10 />
 567 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
 568 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
 569 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
 570 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
 571 <br />
 572 {% endfor %}
 573 {% for name, items in datalist_sets.items() %}
 574 <datalist id="{{name}}">
 575 {% for item in items %}
 576   <option value="{{item|e}}">{{item|e}}</option>
 577 {% endfor %}
 578 </datalist>
 579 {% endfor %}
 580 <input type="hidden" name="start" value={{start}} />
 581 <input type="hidden" name="end" value={{end}} />
 582 <input type="submit" name="save" value="save!">
 583 </form>
 584 """)
 585         import datetime
 586         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 587         bookings, comments = parse_lines(lines)
 588         if len(bookings) > 1:
 589             raise HandledException('can only edit single Booking')
 590         if add_empty_line is not None:
 591             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 592             booking = bookings[0]
 593             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 594         action = 'add_structured'
 595         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 596         for b in db.bookings:
 597             datalist_sets['descriptions'].add(b.description)
 598             for account, moneys in b.account_changes.items():
 599                 datalist_sets['accounts'].add(account)
 600                 for currency in moneys.keys():
 601                     datalist_sets['currencies'].add(currency)
 602         content = ''
 603         today = str(datetime.datetime.now())[:10]
 604         booking_lines = []
 605         if copy:
 606             start = end = 0
 607         desc = head_comment = ''
 608         if len(bookings) == 0:
 609             for i in range(1, 3):
 610                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '', 'comment': ''}]
 611             date=today
 612         else:
 613             booking = bookings[0]
 614             desc = booking.description
 615             date = today if copy else booking.date_string
 616             head_comment=comments[0]
 617             last_line = len(comments)
 618             for i in range(1, len(comments)):
 619                 account = amount = currency = ''
 620                 if i < len(booking.lines) and booking.lines[i] != '':
 621                     account = booking.lines[i][0]
 622                     amount = booking.lines[i][1]
 623                     currency = booking.lines[i][2]
 624                 booking_lines += [{
 625                         'i': i,
 626                         'acc': account,
 627                         'amt': amount,
 628                         'curr': currency if currency else '',
 629                         'comment': comments[i],
 630                         'comm_cols': len(comments[i])}]
 631         content += tmpl.render(
 632                 action=action,
 633                 date=date,
 634                 desc=desc,
 635                 head_comment=head_comment,
 636                 booking_lines=booking_lines,
 637                 datalist_sets=datalist_sets,
 638                 start=start,
 639                 end=end)
 640         return content
 641
 642
 643 if __name__ == "__main__":
 644     webServer = HTTPServer((hostName, serverPort), MyServer)
 645     print(f"Server started http://{hostName}:{serverPort}")
 646     try:
 647         webServer.serve_forever()
 648     except KeyboardInterrupt:
 649         pass
 650     webServer.server_close()
 651     print("Server stopped.")