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

   1 from http.server import BaseHTTPRequestHandler, HTTPServer
   2 import os
   3 import html
   4 import jinja2
   5 import decimal
   6 import datetime
   7 from urllib.parse import parse_qs, urlparse
   8 hostName = "localhost"
   9 serverPort = 8082
  10
  11
  12 class HandledException(Exception):
  13     pass
  14
  15
  16 def apply_booking_to_account_balances(account_sums, account, currency, amount):
  17     if not account in account_sums:
  18         account_sums[account] = {currency: amount}
  19     elif not currency in account_sums[account].keys():
  20         account_sums[account][currency] = amount
  21     else:
  22         account_sums[account][currency] += amount
  23
  24
  25 def bookings_to_account_tree(bookings):
  26     account_sums = {}
  27     for booking in bookings:
  28         for account, changes in booking.account_changes.items():
  29             for currency, amount in changes.items():
  30                 apply_booking_to_account_balances(account_sums, account, currency, amount)
  31     account_tree = {}
  32     def collect_branches(account_name, path):
  33         node = account_tree
  34         path_copy = path[:]
  35         while len(path_copy) > 0:
  36             step = path_copy.pop(0)
  37             node = node[step]
  38         toks = account_name.split(":", maxsplit=1)
  39         parent = toks[0]
  40         if parent in node.keys():
  41             child = node[parent]
  42         else:
  43             child = {}
  44             node[parent] = child
  45         if len(toks) == 2:
  46             k, v = collect_branches(toks[1], path + [parent])
  47             if k not in child.keys():
  48                 child[k] = v
  49             else:
  50                 child[k].update(v)
  51         return parent, child
  52     for account_name in sorted(account_sums.keys()):
  53         k, v = collect_branches(account_name, [])
  54         if k not in account_tree.keys():
  55             account_tree[k] = v
  56         else:
  57             account_tree[k].update(v)
  58     def collect_totals(parent_path, tree_node):
  59         for k, v in tree_node.items():
  60             child_path = parent_path + ":" + k
  61             for currency, amount in collect_totals(child_path, v).items():
  62                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
  63         return account_sums[parent_path]
  64     for account_name in account_tree.keys():
  65         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
  66     return account_tree, account_sums
  67
  68
  69 def parse_lines(lines, validate_bookings=True):
  70     import datetime
  71     inside_booking = False
  72     date_string, description = None, None
  73     booking_lines = []
  74     start_line = 0
  75     bookings = []
  76     comments = []
  77     lines = lines.copy() + [''] # to ensure a booking-ending last line
  78     last_date = ''
  79     for i, line in enumerate(lines):
  80         prefix = f"line {i}"
  81         # we start with the case of an utterly empty line
  82         comments += [""]
  83         stripped_line = line.rstrip()
  84         if stripped_line == '':
  85             if inside_booking:
  86                 # assume we finished a booking, finalize, and commit to DB
  87                 if len(booking_lines) < 2:
  88                     raise HandledException(f"{prefix} booking ends to early")
  89                 booking = Booking(date_string, description, booking_lines, start_line, validate_bookings)
  90                 bookings += [booking]
  91             # expect new booking to follow so re-zeroall booking data
  92             inside_booking = False
  93             date_string, description = None, None
  94             booking_lines = []
  95             continue
  96         # if non-empty line, first get comment if any, and commit to DB
  97         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
  98         if len(split_by_comment) == 2:
  99             comments[i] = split_by_comment[1].lstrip()
 100         # 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
 101         non_comment = split_by_comment[0].rstrip()
 102         if non_comment.rstrip() == '':
 103              if inside_booking:
 104                  booking_lines += ['']
 105              continue
 106         # if we're starting a booking, parse by first-line pattern
 107         if not inside_booking:
 108             start_line = i
 109             toks = non_comment.split(maxsplit=1)
 110             date_string = toks[0]
 111             try:
 112                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
 113             except ValueError:
 114                 raise HandledException(f"{prefix} bad date string: {date_string}")
 115             if last_date > date_string:
 116                 raise HandledException(f"{prefix} out-of-order-date")
 117             last_date = date_string
 118             try:
 119                 description = toks[1]
 120             except IndexError:
 121                 raise HandledException(f"{prefix} bad description: {description}")
 122             inside_booking = True
 123             booking_lines += [non_comment]
 124             continue
 125         # otherwise, read as transfer data
 126         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 127         if len(toks) > 3:
 128             raise HandledException(f"{prefix} too many booking line tokens: {toks}")
 129         amount, currency = None, None
 130         account_name = toks[0]
 131         if account_name[0] == '[' and account_name[-1] == ']':
 132             # ignore specification's differentiation of "virtual" accounts
 133             account_name = account_name[1:-1]
 134         decimal_chars = ".-0123456789"
 135         if len(toks) == 3:
 136             i_currency = 1
 137             try:
 138                 amount = decimal.Decimal(toks[1])
 139                 i_currency = 2
 140             except decimal.InvalidOperation:
 141                 try:
 142                     amount = decimal.Decimal(toks[2])
 143                 except decimal.InvalidOperation:
 144                     raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
 145             currency = toks[i_currency]
 146             if currency[0] in decimal_chars:
 147                 raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 148         elif len(toks) == 2:
 149             value = toks[1]
 150             inside_amount = False
 151             inside_currency = False
 152             amount_string = ""
 153             currency = ""
 154             dots_counted = 0
 155             for i, c in enumerate(value):
 156                 if i == 0:
 157                     if c in decimal_chars:
 158                         inside_amount = True
 159                     else:
 160                         inside_currency = True
 161                 if inside_currency:
 162                     if c in decimal_chars and len(amount_string) == 0:
 163                         inside_currency = False
 164                         inside_amount = True
 165                     else:
 166                         currency += c
 167                         continue
 168                 if inside_amount:
 169                     if c not in decimal_chars:
 170                         if len(currency) > 0:
 171                             raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
 172                         inside_currency = True
 173                         inside_amount = False
 174                         currency += c
 175                         continue
 176                     if c == '-' and len(amount_string) > 1:
 177                         raise HandledException(f"{prefix} amount has non-start '-': {value}")
 178                     if c == '.':
 179                         if dots_counted > 1:
 180                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
 181                         dots_counted += 1
 182                     amount_string += c
 183             if len(currency) == 0:
 184                 raise HandledException(f"{prefix} currency missing: {value}")
 185             if len(amount_string) > 0:
 186                 amount = decimal.Decimal(amount_string)
 187         booking_lines += [(account_name, amount, currency)]
 188     if inside_booking:
 189         raise HandledException(f"{prefix} last booking unfinished")
 190     return bookings, comments
 191
 192
 193 class Booking:
 194
 195     def __init__(self, date_string, description, booking_lines, start_line, process=True):
 196         self.date_string = date_string
 197         self.description = description
 198         self.lines = booking_lines
 199         self.start_line = start_line
 200         if process:
 201             self.validate_booking_lines()
 202             self.sink = {}
 203             self.account_changes = self.parse_booking_lines_to_account_changes()
 204
 205     def validate_booking_lines(self):
 206         prefix = f"booking at line {self.start_line}"
 207         sums = {}
 208         empty_values = 0
 209         for line in self.lines[1:]:
 210             if line == '':
 211                 continue
 212             _, amount, currency = line
 213             if amount is None:
 214                 if empty_values > 0:
 215                     raise HandledException(f"{prefix} relates more than one empty value of same currency {currency}")
 216                 empty_values += 1
 217                 continue
 218             if currency not in sums:
 219                 sums[currency] = 0
 220             sums[currency] += amount
 221         if empty_values == 0:
 222             for k, v in sums.items():
 223                 if v != 0:
 224                     raise HandledException(f"{prefix} does not add up to zero / {k} {v}")
 225         else:
 226             sinkable = False
 227             for k, v in sums.items():
 228                 if v != 0:
 229                     sinkable = True
 230             if not sinkable:
 231                 raise HandledException(f"{prefix} has empty value that cannot be filled")
 232
 233     def parse_booking_lines_to_account_changes(self):
 234         account_changes = {}
 235         debt = {}
 236         sink_account = None
 237         for line in self.lines[1:]:
 238             if line == '':
 239                 continue
 240             account, amount, currency = line
 241             if amount is None:
 242                 sink_account = account
 243                 continue
 244             apply_booking_to_account_balances(account_changes, account, currency, amount)
 245             if currency not in debt:
 246                 debt[currency] = amount
 247             else:
 248                 debt[currency] += amount
 249         if sink_account:
 250             for currency, amount in debt.items():
 251                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 252                 self.sink[currency] = -amount
 253         return account_changes
 254
 255
 256
 257 class Database:
 258
 259     def __init__(self):
 260         db_name = "_ledger"
 261         self.db_file = db_name + ".json"
 262         self.lock_file = db_name+ ".lock"
 263         self.bookings = []
 264         self.comments = []
 265         self.real_lines = []
 266         if os.path.exists(self.db_file):
 267             with open(self.db_file, "r") as f:
 268                 self.real_lines += [l.rstrip() for l in f.readlines()]
 269         ret = parse_lines(self.real_lines)
 270         self.bookings += ret[0]
 271         self.comments += ret[1]
 272
 273     def get_lines(self, start, end):
 274         return self.real_lines[start:end]
 275
 276     def write_db(self, text, mode='w'):
 277         import shutil
 278         if os.path.exists(self.lock_file):
 279             raise HandledException('Sorry, lock file!')
 280         f = open(self.lock_file, 'w+')
 281         f.close()
 282
 283         # always back up most recent to .bak
 284         bakpath = f'{self.db_file}.bak'
 285         shutil.copy(self.db_file, bakpath)
 286
 287         # collect modification times of numbered .bak files
 288         bak_prefix = f'{bakpath}.'
 289         backup_dates = []
 290         i = 0
 291         bak_as = f'{bak_prefix}{i}'
 292         while os.path.exists(bak_as):
 293             mod_time = os.path.getmtime(bak_as)
 294             backup_dates += [str(datetime.datetime.fromtimestamp(mod_time))]
 295             i += 1
 296             bak_as = f'{bak_prefix}{i}'
 297
 298         # collect what numbered .bak files to save
 299         to_save = []
 300         datetime_len = 19
 301         now = str(datetime.datetime.now())[:datetime_len]
 302         while datetime_len > 2:
 303             for i, date in reversed(list(enumerate(backup_dates))):
 304                 if date[:datetime_len] == now:
 305                     if i not in to_save:
 306                         to_save += [i]
 307                         break
 308             datetime_len -= 1
 309             now = now[:datetime_len]
 310
 311         # remove redundant backup files
 312         j = 0
 313         for i in reversed(to_save):
 314             if i != j:
 315                 source = f'{bak_prefix}{i}'
 316                 target = f'{bak_prefix}{j}'
 317                 shutil.move(source, target)
 318             j += 1
 319         for i in range(j, len(backup_dates)):
 320             try:
 321                 os.remove(f'{bak_prefix}{i}')
 322             except FileNotFoundError:
 323                 pass
 324
 325         #
 326         shutil.copy(self.db_file, f'{bak_prefix}{j}')
 327         with open(self.db_file, mode) as f:
 328             f.write(text);
 329         os.remove(self.lock_file)
 330
 331     def replace(self, start, end, lines):
 332         total_lines = self.real_lines[:start] + lines + self.real_lines[end:]
 333         text = '\n'.join(total_lines)
 334         self.write_db(text)
 335
 336     def append(self, lines):
 337         text = '\n\n' + '\n'.join(lines) + '\n\n'
 338         self.write_db(text, 'a')
 339
 340     def add_taxes(self, lines, finish=False):
 341         ret = []
 342         bookings, _ = parse_lines(lines)
 343         date = bookings[0].date_string
 344         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
 345         acc_kk_minimum = 'Reserves:Month:KrankenkassenDefaultBeitrag'
 346         acc_kk = 'Expenses:KrankenKasse'
 347         acc_est = 'Reserves:Einkommenssteuer'
 348         acc_assets = 'Assets'
 349         acc_buffer = 'Reserves:NeuAnfangsPuffer:Ausgaben'
 350         last_monthbreak_assets = 0
 351         last_monthbreak_est = 0
 352         last_monthbreak_kk_minimum = 0
 353         last_monthbreak_kk_add = 0
 354         buffer_expenses = 0
 355         kk_expenses = 0
 356         est_expenses = 0
 357         months_passed = -int(finish)
 358         for b in self.bookings:
 359             if date == b.date_string:
 360                 break
 361             acc_keys = b.account_changes.keys()
 362             if acc_buffer in acc_keys:
 363                 buffer_expenses -= b.account_changes[acc_buffer]['€']
 364             if acc_kk_add in acc_keys:
 365                 kk_expenses += b.account_changes[acc_kk_add]['€']
 366             if acc_kk in acc_keys:
 367                 kk_expenses += b.account_changes[acc_kk]['€']
 368             if acc_est in acc_keys:
 369                 est_expenses += b.account_changes[acc_est]['€']
 370             if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
 371                 months_passed += 1
 372                 if finish:
 373                     last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
 374                     last_monthbreak_est = b.account_changes[acc_est]['€']
 375                     last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
 376                     last_monthbreak_assets = b.account_changes[acc_buffer]['€']
 377         old_needed_income = last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum + last_monthbreak_est
 378         if finish:
 379             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income}€']
 380         _, account_sums = bookings_to_account_tree(bookings)
 381         expenses_so_far = -1 * account_sums[acc_assets]['€'] - old_needed_income
 382         needed_income_before_kk = expenses_so_far
 383         ESt_this_month = 0
 384         left_over = needed_income_before_kk - ESt_this_month
 385         too_low = 0
 386         too_high = 2 * needed_income_before_kk
 387         E0 = decimal.Decimal(10908)
 388         E1 = decimal.Decimal(15999)
 389         E2 = decimal.Decimal(62809)
 390         E3 = decimal.Decimal(277825)
 391         while True:
 392             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
 393             if finish:
 394                 zvE += last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum
 395             if zvE < E0:
 396                 ESt = decimal.Decimal(0)
 397             elif zvE < E1:
 398                 y = (zvE - E0)/10000
 399                 ESt = (decimal.Decimal(979.18) * y + 1400) * y
 400             elif zvE < E2:
 401                 y = (zvE - E1)/10000
 402                 ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
 403             elif zvE < E3:
 404                 ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
 405             else:
 406                 ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
 407             ESt_this_month = (ESt + last_monthbreak_est - est_expenses) / (12 - months_passed)
 408             left_over = needed_income_before_kk - ESt_this_month
 409             if abs(left_over - expenses_so_far) < 0.001:
 410                 break
 411             elif left_over < expenses_so_far:
 412                 too_low = needed_income_before_kk
 413             elif left_over > expenses_so_far:
 414                 too_high = needed_income_before_kk
 415             needed_income_before_kk = too_low + (too_high - too_low)/2
 416         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
 417         ret += [f'  {acc_est}  {ESt_this_month}€ ; expenses so far: {expenses_so_far:.2f}€; zvE: {zvE:.2f}€; ESt total: {ESt:.2f}€; needed before Krankenkasse: {needed_income_before_kk:.2f}€']
 418         kk_minimum_income = 1131.67
 419         if date < '2023-02-01':
 420             kk_minimum_income = decimal.Decimal(1096.67)
 421             kk_factor = decimal.Decimal(0.189)
 422             kk_minimum_tax = decimal.Decimal(207.27).quantize(decimal.Decimal('0.00'))
 423         elif date < '2023-08-01':
 424             kk_factor = decimal.Decimal(0.191)
 425             kk_minimum_tax = decimal.Decimal(216.15).quantize(decimal.Decimal('0.00'))
 426         else:
 427             kk_factor = decimal.Decimal(0.197)
 428             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
 429         kk_add = max(0, kk_factor * needed_income_before_kk - kk_minimum_tax)
 430         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
 431         if finish:
 432             ret += [f'  {acc_kk_add}  {-last_monthbreak_kk_add}€  ; max(0, {kk_factor:.3f} * {-(old_needed_income - last_monthbreak_est):.2f}€ - {kk_minimum_tax}€)']
 433         else:
 434             ret += [f'  {acc_kk_minimum}  {kk_minimum_tax}€  ; assumed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}']
 435         ret += [f'  {acc_kk_add}  {kk_add}€  ; max(0, {kk_factor:.3f} * {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€)']
 436         diff = - last_monthbreak_est + ESt_this_month - last_monthbreak_kk_add + kk_add
 437         if not finish:
 438             diff += kk_minimum_tax
 439         final_minus = expenses_so_far + old_needed_income + diff
 440         ret += [f'  {acc_assets}  {-diff} €']
 441         ret += [f'  {acc_assets}  {final_minus} €']
 442         year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus
 443         ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {-year_needed}']
 444         return ret
 445
 446
 447 class MyServer(BaseHTTPRequestHandler):
 448     header = """<html>
 449 <meta charset="UTF-8">
 450 <style>
 451 body { color: #000000; }
 452 table { margin-bottom: 2em; }
 453 th, td { text-align: left }
 454 input[type=number] { text-align: right; font-family: monospace; }
 455 .money { font-family: monospace; text-align: right; }
 456 .comment { font-style: italic; color: #777777; }
 457 .meta { font-size: 0.75em; color: #777777; }
 458 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 459 </style>
 460 <body>
 461 <a href="/">ledger</a>
 462 <a href="/balance">balance</a>
 463 <a href="/add_free">add free</a>
 464 <a href="/add_structured">add structured</a>
 465 <hr />
 466 """
 467     booking_tmpl = jinja2.Template("""
 468 <p id="{{nth}}"><a href="#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
 469 <span class="meta">[edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
 470 / <a href="/add_free?start={{start}}&end={{end}}">free</a>
 471 | copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
 472 / <a href="/copy_free?start={{start}}&end={{end}}">free</a>
 473 | <a href="/balance?stop={{nth+1}}">balance after</a>
 474 ]</span>
 475 <table>
 476 {% for l in booking_lines %}
 477 {% if l.acc %}
 478 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
 479 {% else %}
 480 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
 481 {% endif %}
 482 {% endfor %}
 483 </table></p>
 484 """)
 485     add_form_footer = """
 486 <input type="hidden" name="start" value={{start}} />
 487 <input type="hidden" name="end" value={{end}} />
 488 <input type="submit" name="save" value="save!">
 489 </form>
 490 """
 491     footer = "</body>\n<html>"
 492
 493     def do_POST(self):
 494         try:
 495             parsed_url = urlparse(self.path)
 496             length = int(self.headers['content-length'])
 497             postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 498             start = int(postvars['start'][0])
 499             end = int(postvars['end'][0])
 500
 501             db = Database()
 502             add_empty_line = None
 503             lines = []
 504             if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 505                 date = postvars['date'][0]
 506                 description = postvars['description'][0]
 507                 start_comment = postvars['line_0_comment'][0]
 508                 lines = [f'{date} {description} ; {start_comment}']
 509                 if 'line_0_add' in postvars.keys():
 510                     add_empty_line = 0
 511                 i = j = 1
 512                 while f'line_{i}_comment' in postvars.keys():
 513                     if f'line_{i}_delete' in postvars.keys():
 514                         i += 1
 515                         continue
 516                     elif f'line_{i}_delete_after' in postvars.keys():
 517                         break
 518                     elif f'line_{i}_add' in postvars.keys():
 519                         add_empty_line = j
 520                     account = postvars[f'line_{i}_account'][0]
 521                     amount = postvars[f'line_{i}_amount'][0]
 522                     currency = postvars[f'line_{i}_currency'][0]
 523                     comment = postvars[f'line_{i}_comment'][0]
 524                     i += 1
 525                     new_main = f'  {account}  {amount}'
 526                     if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
 527                         continue
 528                     if len(amount.rstrip()) > 0:
 529                         new_main += f' {currency}'
 530                     j += 1
 531                     new_line = new_main
 532                     if comment.rstrip() != '':
 533                         new_line += f'  ; {comment}'
 534                     lines += [new_line]
 535                 if 'add_sink' in postvars.keys():
 536                     temp_lines = lines.copy() + ['_']
 537                     try:
 538                         temp_bookings, _ = parse_lines(temp_lines)
 539                         for currency in temp_bookings[0].sink:
 540                             amount = temp_bookings[0].sink[currency]
 541                             lines += [f'Assets  {amount:.2f} {currency}']
 542                     except HandledException:
 543                         pass
 544                 if 'add_taxes' in postvars.keys():
 545                     lines += db.add_taxes(lines, finish=False)
 546                 elif 'add_taxes2' in postvars.keys():
 547                     lines += db.add_taxes(lines, finish=True)
 548             elif '/add_free' == parsed_url.path:
 549                 lines = postvars['booking'][0].splitlines()
 550
 551             if ('save' in postvars.keys()) or ('check' in postvars.keys()):
 552                 _, _ = parse_lines(lines)
 553
 554             if 'save' in postvars.keys():
 555                 if start == end == 0:
 556                     db.append(lines)
 557                     redir_url = f'/#last'
 558                 else:
 559                     db.replace(start, end, lines)
 560                     nth = 0
 561                     for i, b in enumerate(db.bookings):
 562                         if b.start_line == start:
 563                             nth = i
 564                             break
 565                     redir_url = f'/#{nth}'
 566                 self.send_code_and_headers(301, [('Location', redir_url)])
 567             else:  # implicit assumption: this only happens on /add_structured flows
 568                 page = self.header + self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line) + self.footer
 569                 self.send_HTML(page)
 570         except HandledException as e:
 571             self.fail_400(e)
 572
 573     def do_GET(self):
 574         try:
 575             parsed_url = urlparse(self.path)
 576             params = parse_qs(parsed_url.query)
 577             start = int(params.get('start', ['0'])[0])
 578             end = int(params.get('end', ['0'])[0])
 579             db = Database()
 580             page = self.header
 581             if parsed_url.path == '/balance':
 582                 stop = params.get('stop', [None])[0]
 583                 page += self.balance_as_html(db, stop)
 584             elif parsed_url.path == '/add_free':
 585                 page += self.add_free(db, start, end)
 586             elif parsed_url.path == '/add_structured':
 587                 page += self.add_structured(db, start, end)
 588             elif parsed_url.path == '/copy_free':
 589                 page += self.add_free(db, start, end, copy=True)
 590             elif parsed_url.path == '/copy_structured':
 591                 page += self.add_structured(db, start, end, copy=True)
 592             else:
 593                 page += self.ledger_as_html(db)
 594             page += self.footer
 595             self.send_HTML(page)
 596         except HandledException as e:
 597             self.fail_400(e)
 598
 599     def fail_400(self, e):
 600         page = f'{self.header}ERROR: {e}{self.footer}'
 601         self.send_HTML(page, 400)
 602
 603     def send_HTML(self, html, code=200):
 604         self.send_code_and_headers(code, [('Content-type', 'text/html')])
 605         self.wfile.write(bytes(html, "utf-8"))
 606
 607     def send_code_and_headers(self, code, headers=[]):
 608         self.send_response(code)
 609         for fieldname, content in headers:
 610             self.send_header(fieldname, content)
 611         self.end_headers()
 612
 613     def balance_as_html(self, db, until=None):
 614         bookings = db.bookings[:until if until is None else int(until)]
 615         lines = []
 616         account_tree, account_sums = bookings_to_account_tree(bookings)
 617         def print_subtree(lines, indent, node, subtree, path):
 618             line = f"{indent}{node}"
 619             n_tabs = 5 - (len(line) // 8)
 620             line += n_tabs * "\t"
 621             if "€" in account_sums[path + node].keys():
 622                 amount = account_sums[path + node]["€"]
 623                 line += f"{amount:9.2f} €\t"
 624             else:
 625                 line += f"\t\t"
 626             for currency, amount in account_sums[path + node].items():
 627                 if currency != '€' and amount > 0:
 628                     line += f"{amount:5.2f} {currency}\t"
 629             lines += [line]
 630             indent += "  "
 631             for k, v in sorted(subtree.items()):
 632                 print_subtree(lines, indent, k, v, path + node + ":")
 633         for k, v in sorted(account_tree.items()):
 634             print_subtree(lines, "", k, v, "")
 635         content = "\n".join(lines)
 636         return f"<pre>{content}</pre>"
 637
 638     def ledger_as_html(self, db):
 639         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')  ##
 640         elements_to_write = []
 641         last_i = i = 0  ##
 642         for nth, booking in enumerate(db.bookings):
 643             booking_end = last_i = booking.start_line + len(booking.lines)
 644             booking_lines = []
 645             i = booking.start_line  ##
 646             elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']  ##
 647             for booking_line in booking.lines[1:]:
 648                  i += 1  ##
 649                  comment = db.comments[i]  ##
 650                  if booking_line == '':
 651                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]  ##
 652                      continue
 653                  account = booking_line[0]
 654                  money = ''
 655                  if booking_line[1] is not None:
 656                      money = f'{booking_line[1]} {booking_line[2]}'
 657                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
 658             elements_to_write += [self.booking_tmpl.render(
 659                 nth=nth,
 660                 start=booking.start_line,
 661                 end=booking_end,
 662                 date=booking.date_string,
 663                 desc=booking.description,
 664                 head_comment=db.comments[booking.start_line],
 665                 booking_lines = booking_lines)]
 666         elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:] if c != '']  #
 667         return '\n'.join(elements_to_write)
 668
 669     def add_free(self, db, start=0, end=0, copy=False):
 670         tmpl = jinja2.Template("""
 671 <form method="POST" action="{{action|e}}">
 672 <textarea name="booking" rows=10 cols=80>
 673 {% for line in lines %}{{ line }}
 674 {% endfor %}
 675 </textarea>
 676 """ + self.add_form_footer)
 677         lines = db.get_lines(start, end)
 678         if copy:
 679             start = end = 0
 680         return tmpl.render(action='add_free', start=start, end=end, lines=lines)
 681
 682     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 683         tmpl = jinja2.Template("""
 684 <form method="POST" action="{{action|e}}">
 685 <input type="submit" name="check" value="check" />
 686 <input type="submit" name="revert" value="revert" />
 687 <input type="submit" name="add_taxes" value="add taxes" />
 688 <input type="submit" name="add_taxes2" value="add taxes2" />
 689 <input type="submit" name="add_sink" value="add sink" />
 690 <br />
 691 <input name="date" value="{{date|e}}" size=9 />
 692 <input name="description" value="{{desc|e}}" list="descriptions" />
 693 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
 694 <input type="submit" name="line_0_add" value="[+]" />
 695 <br />
 696 {% for line in booking_lines %}
 697 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
 698 <input type="number" name="line_{{line.i}}_amount" step=0.01 value="{{line.amt}}" size=10 />
 699 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
 700 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
 701 <input type="submit" name="line_{{line.i}}_delete_after" value="[XX]" />
 702 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
 703 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
 704 <br />
 705 {% endfor %}
 706 {% for name, items in datalist_sets.items() %}
 707 <datalist id="{{name}}">
 708 {% for item in items %}
 709   <option value="{{item|e}}">{{item|e}}</option>
 710 {% endfor %}
 711 </datalist>
 712 {% endfor %}
 713 """ + self.add_form_footer)
 714         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 715         bookings, comments = parse_lines(lines, validate_bookings=False)
 716         if len(bookings) > 1:
 717             raise HandledException('can only edit single Booking')
 718         if add_empty_line is not None:
 719             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 720             booking = bookings[0]
 721             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 722         action = 'add_structured'
 723         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 724         for b in db.bookings:
 725             datalist_sets['descriptions'].add(b.description)
 726             for account, moneys in b.account_changes.items():
 727                 datalist_sets['accounts'].add(account)
 728                 for currency in moneys.keys():
 729                     datalist_sets['currencies'].add(currency)
 730         content = ''
 731         today = str(datetime.datetime.now())[:10]
 732         booking_lines = []
 733         if copy:
 734             start = end = 0
 735         desc = head_comment = ''
 736         if len(bookings) == 0:
 737             for i in range(1, 3):
 738                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
 739             date=today
 740         else:
 741             booking = bookings[0]
 742             desc = booking.description
 743             date = today if copy else booking.date_string
 744             head_comment=comments[0]
 745             last_line = len(comments)
 746             for i in range(1, len(comments)):
 747                 account = amount = currency = ''
 748                 if i < len(booking.lines) and booking.lines[i] != '':
 749                     account = booking.lines[i][0]
 750                     amount = booking.lines[i][1]
 751                     currency = booking.lines[i][2]
 752                 booking_lines += [{
 753                         'i': i,
 754                         'acc': account,
 755                         'amt': amount,
 756                         'curr': currency if currency else '€',
 757                         'comment': comments[i],
 758                         'comm_cols': len(comments[i])}]
 759         content += tmpl.render(
 760                 action=action,
 761                 date=date,
 762                 desc=desc,
 763                 head_comment=head_comment,
 764                 booking_lines=booking_lines,
 765                 datalist_sets=datalist_sets,
 766                 start=start,
 767                 end=end)
 768         return content
 769
 770
 771 if __name__ == "__main__":
 772     webServer = HTTPServer((hostName, serverPort), MyServer)
 773     print(f"Server started http://{hostName}:{serverPort}")
 774     try:
 775         webServer.serve_forever()
 776     except KeyboardInterrupt:
 777         pass
 778     webServer.server_close()
 779     print("Server stopped.")