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 import decimal
   7 import datetime
   8 from urllib.parse import parse_qs, urlparse
   9 hostName = "localhost"
  10 serverPort = 8082
  11
  12
  13 class HandledException(Exception):
  14     pass
  15
  16
  17 def handled_error_exit(msg):
  18     print(f"ERROR: {msg}")
  19     sys.exit(1)
  20
  21
  22 def apply_booking_to_account_balances(account_sums, account, currency, amount):
  23     if not account in account_sums:
  24         account_sums[account] = {currency: amount}
  25     elif not currency in account_sums[account].keys():
  26         account_sums[account][currency] = amount
  27     else:
  28         account_sums[account][currency] += amount
  29
  30
  31 def bookings_to_account_tree(bookings):
  32     account_sums = {}
  33     for booking in bookings:
  34         for account, changes in booking.account_changes.items():
  35             for currency, amount in changes.items():
  36                 apply_booking_to_account_balances(account_sums, account, currency, amount)
  37     account_tree = {}
  38     def collect_branches(account_name, path):
  39         node = account_tree
  40         path_copy = path[:]
  41         while len(path_copy) > 0:
  42             step = path_copy.pop(0)
  43             node = node[step]
  44         toks = account_name.split(":", maxsplit=1)
  45         parent = toks[0]
  46         if parent in node.keys():
  47             child = node[parent]
  48         else:
  49             child = {}
  50             node[parent] = child
  51         if len(toks) == 2:
  52             k, v = collect_branches(toks[1], path + [parent])
  53             if k not in child.keys():
  54                 child[k] = v
  55             else:
  56                 child[k].update(v)
  57         return parent, child
  58     for account_name in sorted(account_sums.keys()):
  59         k, v = collect_branches(account_name, [])
  60         if k not in account_tree.keys():
  61             account_tree[k] = v
  62         else:
  63             account_tree[k].update(v)
  64     def collect_totals(parent_path, tree_node):
  65         for k, v in tree_node.items():
  66             child_path = parent_path + ":" + k
  67             for currency, amount in collect_totals(child_path, v).items():
  68                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
  69         return account_sums[parent_path]
  70     for account_name in account_tree.keys():
  71         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
  72     return account_tree, account_sums
  73
  74
  75 def parse_lines(lines, validate_bookings=True):
  76     import datetime
  77     inside_booking = False
  78     date_string, description = None, None
  79     booking_lines = []
  80     start_line = 0
  81     bookings = []
  82     comments = []
  83     lines = lines.copy() + [''] # to ensure a booking-ending last line
  84     last_date = ''
  85     for i, line in enumerate(lines):
  86         prefix = f"line {i}"
  87         # we start with the case of an utterly empty line
  88         comments += [""]
  89         stripped_line = line.rstrip()
  90         if stripped_line == '':
  91             if inside_booking:
  92                 # assume we finished a booking, finalize, and commit to DB
  93                 if len(booking_lines) < 2:
  94                     raise HandledException(f"{prefix} booking ends to early")
  95                 booking = Booking(date_string, description, booking_lines, start_line, validate_bookings)
  96                 bookings += [booking]
  97             # expect new booking to follow so re-zeroall booking data
  98             inside_booking = False
  99             date_string, description = None, None
 100             booking_lines = []
 101             continue
 102         # if non-empty line, first get comment if any, and commit to DB
 103         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
 104         if len(split_by_comment) == 2:
 105             comments[i] = split_by_comment[1].lstrip()
 106         # 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
 107         non_comment = split_by_comment[0].rstrip()
 108         if non_comment.rstrip() == '':
 109              if inside_booking:
 110                  booking_lines += ['']
 111              continue
 112         # if we're starting a booking, parse by first-line pattern
 113         if not inside_booking:
 114             start_line = i
 115             toks = non_comment.split(maxsplit=1)
 116             date_string = toks[0]
 117             try:
 118                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
 119             except ValueError:
 120                 raise HandledException(f"{prefix} bad date string: {date_string}")
 121             if last_date > date_string:
 122                 raise HandledException(f"{prefix} out-of-order-date")
 123             last_date = date_string
 124             try:
 125                 description = toks[1]
 126             except IndexError:
 127                 raise HandledException(f"{prefix} bad description: {description}")
 128             inside_booking = True
 129             booking_lines += [non_comment]
 130             continue
 131         # otherwise, read as transfer data
 132         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 133         if len(toks) > 3:
 134             raise HandledException(f"{prefix} too many booking line tokens: {toks}")
 135         amount, currency = None, None
 136         account_name = toks[0]
 137         if account_name[0] == '[' and account_name[-1] == ']':
 138             # ignore specification's differentiation of "virtual" accounts
 139             account_name = account_name[1:-1]
 140         decimal_chars = ".-0123456789"
 141         if len(toks) == 3:
 142             i_currency = 1
 143             try:
 144                 amount = decimal.Decimal(toks[1])
 145                 i_currency = 2
 146             except decimal.InvalidOperation:
 147                 try:
 148                     amount = decimal.Decimal(toks[2])
 149                 except decimal.InvalidOperation:
 150                     raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
 151             currency = toks[i_currency]
 152             if currency[0] in decimal_chars:
 153                 raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 154         elif len(toks) == 2:
 155             value = toks[1]
 156             inside_amount = False
 157             inside_currency = False
 158             amount_string = ""
 159             currency = ""
 160             dots_counted = 0
 161             for i, c in enumerate(value):
 162                 if i == 0:
 163                     if c in decimal_chars:
 164                         inside_amount = True
 165                     else:
 166                         inside_currency = True
 167                 if inside_currency:
 168                     if c in decimal_chars and len(amount_string) == 0:
 169                         inside_currency = False
 170                         inside_amount = True
 171                     else:
 172                         currency += c
 173                         continue
 174                 if inside_amount:
 175                     if c not in decimal_chars:
 176                         if len(currency) > 0:
 177                             raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
 178                         inside_currency = True
 179                         inside_amount = False
 180                         currency += c
 181                         continue
 182                     if c == '-' and len(amount_string) > 1:
 183                         raise HandledException(f"{prefix} amount has non-start '-': {value}")
 184                     if c == '.':
 185                         if dots_counted > 1:
 186                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
 187                         dots_counted += 1
 188                     amount_string += c
 189             if len(currency) == 0:
 190                 raise HandledException(f"{prefix} currency missing: {value}")
 191             if len(amount_string) > 0:
 192                 amount = decimal.Decimal(amount_string)
 193         booking_lines += [(account_name, amount, currency)]
 194     if inside_booking:
 195         raise HandledException(f"{prefix} last booking unfinished")
 196     return bookings, comments
 197
 198
 199 class Booking:
 200
 201     def __init__(self, date_string, description, booking_lines, start_line, process=True):
 202         self.date_string = date_string
 203         self.description = description
 204         self.lines = booking_lines
 205         self.start_line = start_line
 206         if process:
 207             self.validate_booking_lines()
 208             self.sink = {}
 209             self.account_changes = self.parse_booking_lines_to_account_changes()
 210
 211     def validate_booking_lines(self):
 212         prefix = f"booking at line {self.start_line}"
 213         sums = {}
 214         empty_values = 0
 215         for line in self.lines[1:]:
 216             if line == '':
 217                 continue
 218             _, amount, currency = line
 219             if amount is None:
 220                 if empty_values > 0:
 221                     raise HandledException(f"{prefix} relates more than one empty value of same currency {currency}")
 222                 empty_values += 1
 223                 continue
 224             if currency not in sums:
 225                 sums[currency] = 0
 226             sums[currency] += amount
 227         if empty_values == 0:
 228             for k, v in sums.items():
 229                 if v != 0:
 230                     raise HandledException(f"{prefix} does not add up to zero / {k} {v}")
 231         else:
 232             sinkable = False
 233             for k, v in sums.items():
 234                 if v != 0:
 235                     sinkable = True
 236             if not sinkable:
 237                 raise HandledException(f"{prefix} has empty value that cannot be filled")
 238
 239     def parse_booking_lines_to_account_changes(self):
 240         account_changes = {}
 241         debt = {}
 242         sink_account = None
 243         for line in self.lines[1:]:
 244             if line == '':
 245                 continue
 246             account, amount, currency = line
 247             if amount is None:
 248                 sink_account = account
 249                 continue
 250             apply_booking_to_account_balances(account_changes, account, currency, amount)
 251             if currency not in debt:
 252                 debt[currency] = amount
 253             else:
 254                 debt[currency] += amount
 255         if sink_account:
 256             for currency, amount in debt.items():
 257                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 258                 self.sink[currency] = -amount
 259         return account_changes
 260
 261
 262
 263 class Database:
 264
 265     def __init__(self):
 266         db_name = "_ledger"
 267         self.db_file = db_name + ".json"
 268         self.lock_file = db_name+ ".lock"
 269         self.bookings = []
 270         self.comments = []
 271         self.real_lines = []
 272         if os.path.exists(self.db_file):
 273             with open(self.db_file, "r") as f:
 274                 self.real_lines += [l.rstrip() for l in f.readlines()]
 275         ret = parse_lines(self.real_lines)
 276         self.bookings += ret[0]
 277         self.comments += ret[1]
 278
 279     def get_lines(self, start, end):
 280         return self.real_lines[start:end]
 281
 282     def write_db(self, text, mode='w'):
 283         import shutil
 284         if os.path.exists(self.lock_file):
 285             raise HandledException('Sorry, lock file!')
 286         f = open(self.lock_file, 'w+')
 287         f.close()
 288
 289         # always back up most recent to .bak
 290         bakpath = f'{self.db_file}.bak'
 291         shutil.copy(self.db_file, bakpath)
 292
 293         # collect modification times of numbered .bak files
 294         bak_prefix = f'{bakpath}.'
 295         backup_dates = []
 296         i = 0
 297         bak_as = f'{bak_prefix}{i}'
 298         while os.path.exists(bak_as):
 299             mod_time = os.path.getmtime(bak_as)
 300             backup_dates += [str(datetime.datetime.fromtimestamp(mod_time))]
 301             i += 1
 302             bak_as = f'{bak_prefix}{i}'
 303
 304         # collect what numbered .bak files to save
 305         to_save = []
 306         datetime_len = 19
 307         now = str(datetime.datetime.now())[:datetime_len]
 308         while datetime_len > 2:
 309             for i, date in reversed(list(enumerate(backup_dates))):
 310                 if date[:datetime_len] == now:
 311                     if i not in to_save:
 312                         to_save += [i]
 313                         break
 314             datetime_len -= 1
 315             now = now[:datetime_len]
 316
 317         # remove redundant backup files
 318         j = 0
 319         for i in reversed(to_save):
 320             if i != j:
 321                 source = f'{bak_prefix}{i}'
 322                 target = f'{bak_prefix}{j}'
 323                 shutil.move(source, target)
 324             else:
 325                 print("keeping", i)
 326             j += 1
 327         for i in range(j, len(backup_dates)):
 328             print("removing", i)
 329             try:
 330                 os.remove(f'{bak_prefix}{i}')
 331             except FileNotFoundError:
 332                 pass
 333
 334         #
 335         shutil.copy(self.db_file, f'{bak_prefix}{j}')
 336         with open(self.db_file, mode) as f:
 337             f.write(text);
 338         os.remove(self.lock_file)
 339
 340     def replace(self, start, end, lines):
 341         total_lines = self.real_lines[:start] + lines + self.real_lines[end:]
 342         text = '\n'.join(total_lines)
 343         self.write_db(text)
 344
 345     def append(self, lines):
 346         text = '\n\n' + '\n'.join(lines) + '\n\n'
 347         self.write_db(text, 'a')
 348
 349     def add_taxes(self, lines, finish=False):
 350         ret = []
 351         bookings, _ = parse_lines(lines)
 352         date = bookings[0].date_string
 353         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
 354         acc_kk_minimum = 'Reserves:Month:KrankenkassenDefaultBeitrag'
 355         acc_kk = 'Expenses:KrankenKasse'
 356         acc_est = 'Reserves:Einkommenssteuer'
 357         acc_assets = 'Assets'
 358         acc_buffer = 'Reserves:NeuAnfangsPuffer:Ausgaben'
 359         last_monthbreak_assets = 0
 360         last_monthbreak_est = 0
 361         last_monthbreak_kk_minimum = 0
 362         last_monthbreak_kk_add = 0
 363         buffer_expenses = 0
 364         kk_expenses = 0
 365         est_expenses = 0
 366         months_passed = -int(finish)
 367         for b in self.bookings:
 368             if date == b.date_string:
 369                 break
 370             acc_keys = b.account_changes.keys()
 371             if acc_buffer in acc_keys:
 372                 buffer_expenses -= b.account_changes[acc_buffer]['€']
 373             if acc_kk_add in acc_keys:
 374                 kk_expenses += b.account_changes[acc_kk_add]['€']
 375             if acc_kk in acc_keys:
 376                 kk_expenses += b.account_changes[acc_kk]['€']
 377             if acc_est in acc_keys:
 378                 est_expenses += b.account_changes[acc_est]['€']
 379             if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
 380                 months_passed += 1
 381                 if finish:
 382                     last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
 383                     last_monthbreak_est = b.account_changes[acc_est]['€']
 384                     last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
 385                     last_monthbreak_assets = b.account_changes[acc_buffer]['€']
 386         old_needed_income = last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum + last_monthbreak_est
 387         if finish:
 388             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income}€']
 389         _, account_sums = bookings_to_account_tree(bookings)
 390         expenses_so_far = -1 * account_sums[acc_assets]['€'] - old_needed_income
 391         needed_income_before_kk = expenses_so_far
 392         ESt_this_month = 0
 393         left_over = needed_income_before_kk - ESt_this_month
 394         too_low = 0
 395         too_high = 2 * needed_income_before_kk
 396         E0 = decimal.Decimal(10908)
 397         E1 = decimal.Decimal(15999)
 398         E2 = decimal.Decimal(62809)
 399         E3 = decimal.Decimal(277825)
 400         while True:
 401             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
 402             if finish:
 403                 zvE += last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum
 404             if zvE < E0:
 405                 ESt = decimal.Decimal(0)
 406             elif zvE < E1:
 407                 y = (zvE - E0)/10000
 408                 ESt = (decimal.Decimal(979.18) * y + 1400) * y
 409             elif zvE < E2:
 410                 y = (zvE - E1)/10000
 411                 ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
 412             elif zvE < E3:
 413                 ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
 414             else:
 415                 ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
 416             ESt_this_month = (ESt + last_monthbreak_est - est_expenses) / (12 - months_passed)
 417             left_over = needed_income_before_kk - ESt_this_month
 418             if abs(left_over - expenses_so_far) < 0.001:
 419                 break
 420             elif left_over < expenses_so_far:
 421                 too_low = needed_income_before_kk
 422             elif left_over > expenses_so_far:
 423                 too_high = needed_income_before_kk
 424             needed_income_before_kk = too_low + (too_high - too_low)/2
 425         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
 426         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}€']
 427         kk_minimum_income = 1131.67
 428         if date < '2023-02-01':
 429             kk_minimum_income = decimal.Decimal(1096.67)
 430             kk_factor = decimal.Decimal(0.189)
 431             kk_minimum_tax = decimal.Decimal(207.27).quantize(decimal.Decimal('0.00'))
 432         elif date < '2023-08-01':
 433             kk_factor = decimal.Decimal(0.191)
 434             kk_minimum_tax = decimal.Decimal(216.15).quantize(decimal.Decimal('0.00'))
 435         else:
 436             kk_factor = decimal.Decimal(0.197)
 437             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
 438         kk_add = max(0, kk_factor * needed_income_before_kk - kk_minimum_tax)
 439         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
 440         if finish:
 441             ret += [f'  {acc_kk_add}  {-last_monthbreak_kk_add}€  ; max(0, {kk_factor:.3f} * {-(old_needed_income - last_monthbreak_est):.2f}€ - {kk_minimum_tax}€)']
 442         else:
 443             ret += [f'  {acc_kk_minimum}  {kk_minimum_tax}€  ; assumed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}']
 444         ret += [f'  {acc_kk_add}  {kk_add}€  ; max(0, {kk_factor:.3f} * {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€)']
 445         diff = - last_monthbreak_est + ESt_this_month - last_monthbreak_kk_add + kk_add
 446         if not finish:
 447             diff += kk_minimum_tax
 448         final_minus = expenses_so_far + old_needed_income + diff
 449         ret += [f'  {acc_assets}  {-diff} €']
 450         ret += [f'  {acc_assets}  {final_minus} €']
 451         year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus
 452         ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {-year_needed}']
 453         return ret
 454
 455
 456 class MyServer(BaseHTTPRequestHandler):
 457     header = """<html>
 458 <meta charset="UTF-8">
 459 <style>
 460 body { color: #000000; }
 461 table { margin-bottom: 2em; }
 462 th, td { text-align: left }
 463 input[type=number] { text-align: right; font-family: monospace; }
 464 .money { font-family: monospace; text-align: right; }
 465 .comment { font-style: italic; color: #777777; }
 466 .meta { font-size: 0.75em; color: #777777; }
 467 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 468 </style>
 469 <body>
 470 <a href="/ledger1">ledger1</a>
 471 <a href="/ledger2">ledger2</a>
 472 <a href="/balance">balance</a>
 473 <a href="/add_free">add free</a>
 474 <a href="/add_structured">add structured</a>
 475 <hr />
 476 """
 477     booking_tmpl = jinja2.Template("""
 478 <p id="{{start}}"><a href="#{{start}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
 479 <span class="meta">[edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
 480 / <a href="/add_free?start={{start}}&end={{end}}">free</a>
 481 | copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
 482 / <a href="/copy_free?start={{start}}&end={{end}}">free</a>
 483 | balance <a href="/balance?stop={{date}}&plus={{steps_after_date}}">before</a> or <a href="/balance?stop={{date}}&plus={{steps_after_date + 1}}">after</a>
 484 ]</span>
 485 <table>
 486 {% for l in booking_lines %}
 487 {% if l.acc %}
 488 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
 489 {% else %}
 490 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
 491 {% endif %}
 492 {% endfor %}
 493 </table></p>
 494 """)
 495     footer = "</body>\n<html>"
 496
 497     def do_POST(self):
 498         try:
 499             db = Database()
 500             length = int(self.headers['content-length'])
 501             postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 502             parsed_url = urlparse(self.path)
 503             lines = []
 504             add_empty_line = None
 505             start = int(postvars['start'][0])
 506             end = int(postvars['end'][0])
 507             if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 508                 date = postvars['date'][0]
 509                 description = postvars['description'][0]
 510                 start_comment = postvars['line_0_comment'][0]
 511                 lines = [f'{date} {description} ; {start_comment}']
 512                 if 'line_0_add' in postvars.keys():
 513                     add_empty_line = 0
 514                 i = j = 1
 515                 while f'line_{i}_comment' in postvars.keys():
 516                     if f'line_{i}_delete' in postvars.keys():
 517                         i += 1
 518                         continue
 519                     elif f'line_{i}_delete_after' in postvars.keys():
 520                         break
 521                     elif f'line_{i}_add' in postvars.keys():
 522                         add_empty_line = j
 523                     account = postvars[f'line_{i}_account'][0]
 524                     amount = postvars[f'line_{i}_amount'][0]
 525                     currency = postvars[f'line_{i}_currency'][0]
 526                     comment = postvars[f'line_{i}_comment'][0]
 527                     i += 1
 528                     new_main = f'  {account}  {amount}'
 529                     if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
 530                         continue
 531                     if len(amount.rstrip()) > 0:
 532                         new_main += f' {currency}'
 533                     j += 1
 534                     new_line = new_main
 535                     if comment.rstrip() != '':
 536                         new_line += f'  ; {comment}'
 537                     lines += [new_line]
 538                 if 'add_sink' in postvars.keys():
 539                     temp_lines = lines.copy() + ['_']
 540                     try:
 541                         temp_bookings, _ = parse_lines(temp_lines)
 542                         for currency in temp_bookings[0].sink:
 543                             amount = temp_bookings[0].sink[currency]
 544                             lines += [f'Assets  {amount:.2f} {currency}']
 545                     except HandledException:
 546                         pass
 547                 if 'add_taxes' in postvars.keys():
 548                     lines += db.add_taxes(lines, finish=False)
 549                 elif 'add_taxes2' in postvars.keys():
 550                     lines += db.add_taxes(lines, finish=True)
 551             elif '/add_free' == parsed_url.path:
 552                 lines = postvars['booking'][0].splitlines()
 553             if ('save' in postvars.keys()) or ('check' in postvars.keys()):
 554                 _, _ = parse_lines(lines)
 555             if 'save' in postvars.keys():
 556                 if start == end == 0:
 557                     db.append(lines)
 558                     redir_url = f'/#last'
 559                 else:
 560                     db.replace(start, end, lines)
 561                     redir_url = f'/#{start}'
 562                 self.send_response(301)
 563                 self.send_header('Location', redir_url)
 564                 self.end_headers()
 565             else:
 566                 page = self.header + self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line) + self.footer
 567                 self.send_response(200)
 568                 self.send_header("Content-type", "text/html")
 569                 self.end_headers()
 570                 self.wfile.write(bytes(page, "utf-8"))
 571         except HandledException as e:
 572             self.send_response(400)
 573             self.send_header("Content-type", "text/html")
 574             self.end_headers()
 575             page = f'{self.header}ERROR: {e}{self.footer}'
 576             self.wfile.write(bytes(page, "utf-8"))
 577
 578     def do_GET(self):
 579         self.send_response(200)
 580         self.send_header("Content-type", "text/html")
 581         self.end_headers()
 582         db = Database()
 583         parsed_url = urlparse(self.path)
 584         page = self.header + ''
 585         params = parse_qs(parsed_url.query)
 586         start = int(params.get('start', ['0'])[0])
 587         end = int(params.get('end', ['0'])[0])
 588         if parsed_url.path == '/balance':
 589             stop_date = params.get('stop', [None])[0]
 590             plus = int(params.get('plus', [0])[0])
 591             page += self.balance_as_html(db, stop_date, plus)
 592         elif parsed_url.path == '/add_free':
 593             page += self.add_free(db, start, end)
 594         elif parsed_url.path == '/add_structured':
 595             page += self.add_structured(db, start, end)
 596         elif parsed_url.path == '/copy_free':
 597             page += self.add_free(db, start, end, copy=True)
 598         elif parsed_url.path == '/copy_structured':
 599             page += self.add_structured(db, start, end, copy=True)
 600         elif parsed_url.path == '/ledger2':
 601             page += self.ledger2_as_html(db)
 602         else:
 603             page += self.ledger_as_html(db)
 604         page += self.footer
 605         self.wfile.write(bytes(page, "utf-8"))
 606
 607     def balance_as_html(self, db, stop_date=None, plus=0):
 608         lines = []
 609         bookings = db.bookings
 610         if stop_date:
 611             bookings = []
 612             i = -1
 613             for b in db.bookings:
 614                 if b.date_string == stop_date:
 615                     if -1 == i:
 616                         i = 0
 617                 if i >= plus:
 618                     break
 619                 if i > -1:
 620                     i += 1
 621                 bookings += [b]
 622         account_tree, account_sums = bookings_to_account_tree(bookings)
 623         def print_subtree(lines, indent, node, subtree, path):
 624             line = f"{indent}{node}"
 625             n_tabs = 5 - (len(line) // 8)
 626             line += n_tabs * "\t"
 627             if "€" in account_sums[path + node].keys():
 628                 amount = account_sums[path + node]["€"]
 629                 line += f"{amount:9.2f} €\t"
 630             else:
 631                 line += f"\t\t"
 632             for currency, amount in account_sums[path + node].items():
 633                 if currency != '€' and amount > 0:
 634                     line += f"{amount:5.2f} {currency}\t"
 635             lines += [line]
 636             indent += "  "
 637             for k, v in sorted(subtree.items()):
 638                 print_subtree(lines, indent, k, v, path + node + ":")
 639         for k, v in sorted(account_tree.items()):
 640             print_subtree(lines, "", k, v, "")
 641         content = "\n".join(lines)
 642         return f"<pre>{content}</pre>"
 643
 644     def ledger2_as_html(self, db):
 645         elements_to_write = []
 646         account_sums = {}  ##
 647         nth_of_same_date = 0
 648         same_date = ''
 649         for booking in db.bookings:
 650             if booking.date_string == same_date:
 651                 nth_of_same_date += 1
 652             else:
 653                 same_date = booking.date_string
 654                 nth_of_same_date = 0
 655             booking_end = booking.start_line + len(booking.lines)
 656             booking_lines = []
 657             for booking_line in booking.lines[1:]:
 658                 if booking_line == '':
 659                     continue
 660                 account = booking_line[0]  ##
 661                 account_toks = account.split(':')  ##
 662                 path = ''  ##
 663                 for tok in account_toks: ##
 664                     path += tok  ##
 665                     if not path in account_sums.keys():  ##
 666                         account_sums[path] = {}  ##
 667                     path += ':'  ##
 668                 moneys = []  ##
 669                 money = ''
 670                 if booking_line[1] is not None:
 671                     moneys += [(booking_line[1], booking_line[2])]  ##
 672                     money = f'{moneys[0][0]} {moneys[0][1]}'
 673                 else:  ##
 674                     for currency, amount in booking.sink.items():  ##
 675                         moneys += {(amount, currency)}  ##
 676                     money = '['  ##
 677                     for m in moneys:  ##
 678                         money += f'{m[0]} {m[1]} ' ##
 679                     money += ']'  ##
 680                 balance = ''  ##
 681                 for amount, currency in moneys:  ##
 682                     path = ''  ##
 683                     for tok in account_toks:  ##
 684                         path += tok  ##
 685                         if not currency in account_sums[path].keys():  ##
 686                             account_sums[path][currency] = 0  ##
 687                         account_sums[path][currency] += amount  ##
 688                         path += ':'   ##
 689                     balance += f'{account_sums[account][currency]} {currency}'  ##
 690                 booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':balance}]  ##
 691             elements_to_write += [self.booking_tmpl.render(
 692                 start=booking.start_line,
 693                 end=booking_end,
 694                 date=booking.date_string,
 695                 desc=booking.description,
 696                 head_comment=db.comments[booking.start_line],
 697                 steps_after_date=nth_of_same_date,
 698                 booking_lines = booking_lines)]
 699         return '\n'.join(elements_to_write)
 700
 701     def ledger_as_html(self, db):
 702         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')
 703         elements_to_write = []
 704         last_i = i = 0  ##
 705         nth_of_same_date = 0
 706         same_date = ''
 707         for booking in db.bookings:
 708             if booking.date_string == same_date:
 709                 nth_of_same_date += 1
 710             else:
 711                 same_date = booking.date_string
 712                 nth_of_same_date = 0
 713             i = booking.start_line  ##
 714             elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']  ##
 715             booking_end = last_i = booking.start_line + len(booking.lines)
 716             booking_lines = []
 717             for booking_line in booking.lines[1:]:
 718                  i += 1
 719                  comment = db.comments[i]
 720                  if booking_line == '':
 721                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]
 722                      continue
 723                  account = booking_line[0]
 724                  money = ''
 725                  if booking_line[1] is not None:
 726                      money = f'{booking_line[1]} {booking_line[2]}'
 727                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
 728             elements_to_write += [self.booking_tmpl.render(
 729                 start=booking.start_line,
 730                 end=booking_end,
 731                 date=booking.date_string,
 732                 desc=booking.description,
 733                 head_comment=db.comments[booking.start_line],
 734                 steps_after_date=nth_of_same_date,
 735                 booking_lines = booking_lines)]
 736         elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:] if c != '']
 737         return '\n'.join(elements_to_write)
 738
 739     def add_free(self, db, start=0, end=0, copy=False):
 740         tmpl = jinja2.Template("""
 741 <form method="POST" action="{{action|e}}">
 742 <textarea name="booking" rows=10 cols=80>
 743 {% for line in lines %}{{ line }}
 744 {% endfor %}
 745 </textarea>
 746 <input type="hidden" name="start" value={{start}} />
 747 <input type="hidden" name="end" value={{end}} />
 748 <input type="submit" name="save" value="save!">
 749 </form>
 750 """)
 751         lines = db.get_lines(start, end)
 752         if copy:
 753             start = end = 0
 754         return tmpl.render(action='add_free', start=start, end=end, lines=lines)
 755
 756     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 757         tmpl = jinja2.Template("""
 758 <form method="POST" action="{{action|e}}">
 759 <input type="submit" name="check" value="check" />
 760 <input type="submit" name="revert" value="revert" />
 761 <input type="submit" name="add_taxes" value="add taxes" />
 762 <input type="submit" name="add_taxes2" value="add taxes2" />
 763 <input type="submit" name="add_sink" value="add sink" />
 764 <br />
 765 <input name="date" value="{{date|e}}" size=9 />
 766 <input name="description" value="{{desc|e}}" list="descriptions" />
 767 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
 768 <input type="submit" name="line_0_add" value="[+]" />
 769 <br />
 770 {% for line in booking_lines %}
 771 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
 772 <input type="number" name="line_{{line.i}}_amount" step=0.01 value="{{line.amt}}" size=10 />
 773 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
 774 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
 775 <input type="submit" name="line_{{line.i}}_delete_after" value="[XX]" />
 776 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
 777 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
 778 <br />
 779 {% endfor %}
 780 {% for name, items in datalist_sets.items() %}
 781 <datalist id="{{name}}">
 782 {% for item in items %}
 783   <option value="{{item|e}}">{{item|e}}</option>
 784 {% endfor %}
 785 </datalist>
 786 {% endfor %}
 787 <input type="hidden" name="start" value={{start}} />
 788 <input type="hidden" name="end" value={{end}} />
 789 <input type="submit" name="save" value="save!">
 790 </form>
 791 """)
 792         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 793         bookings, comments = parse_lines(lines, validate_bookings=False)
 794         if len(bookings) > 1:
 795             raise HandledException('can only edit single Booking')
 796         if add_empty_line is not None:
 797             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 798             booking = bookings[0]
 799             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 800         action = 'add_structured'
 801         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 802         for b in db.bookings:
 803             datalist_sets['descriptions'].add(b.description)
 804             for account, moneys in b.account_changes.items():
 805                 datalist_sets['accounts'].add(account)
 806                 for currency in moneys.keys():
 807                     datalist_sets['currencies'].add(currency)
 808         content = ''
 809         today = str(datetime.datetime.now())[:10]
 810         booking_lines = []
 811         if copy:
 812             start = end = 0
 813         desc = head_comment = ''
 814         if len(bookings) == 0:
 815             for i in range(1, 3):
 816                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
 817             date=today
 818         else:
 819             booking = bookings[0]
 820             desc = booking.description
 821             date = today if copy else booking.date_string
 822             head_comment=comments[0]
 823             last_line = len(comments)
 824             for i in range(1, len(comments)):
 825                 account = amount = currency = ''
 826                 if i < len(booking.lines) and booking.lines[i] != '':
 827                     account = booking.lines[i][0]
 828                     amount = booking.lines[i][1]
 829                     currency = booking.lines[i][2]
 830                 booking_lines += [{
 831                         'i': i,
 832                         'acc': account,
 833                         'amt': amount,
 834                         'curr': currency if currency else '€',
 835                         'comment': comments[i],
 836                         'comm_cols': len(comments[i])}]
 837         content += tmpl.render(
 838                 action=action,
 839                 date=date,
 840                 desc=desc,
 841                 head_comment=head_comment,
 842                 booking_lines=booking_lines,
 843                 datalist_sets=datalist_sets,
 844                 start=start,
 845                 end=end)
 846         return content
 847
 848
 849 if __name__ == "__main__":
 850     webServer = HTTPServer((hostName, serverPort), MyServer)
 851     print(f"Server started http://{hostName}:{serverPort}")
 852     try:
 853         webServer.serve_forever()
 854     except KeyboardInterrupt:
 855         pass
 856     webServer.server_close()
 857     print("Server stopped.")