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     inside_booking = False
  71     date_string, description = None, None
  72     booking_lines = []
  73     start_line = 0
  74     bookings = []
  75     comments = []
  76     lines = lines.copy() + [''] # to ensure a booking-ending last line
  77     last_date = ''
  78     for i, line in enumerate(lines):
  79         prefix = f"line {i}"
  80         # we start with the case of an utterly empty line
  81         comments += [""]
  82         stripped_line = line.rstrip()
  83         if stripped_line == '':
  84             if inside_booking:
  85                 # assume we finished a booking, finalize, and commit to DB
  86                 if len(booking_lines) < 2:
  87                     raise HandledException(f"{prefix} booking ends to early")
  88                 booking = Booking(date_string, description, booking_lines, start_line, validate_bookings)
  89                 bookings += [booking]
  90             # expect new booking to follow so re-zeroall booking data
  91             inside_booking = False
  92             date_string, description = None, None
  93             booking_lines = []
  94             continue
  95         # if non-empty line, first get comment if any, and commit to DB
  96         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
  97         if len(split_by_comment) == 2:
  98             comments[i] = split_by_comment[1].lstrip()
  99         # 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
 100         non_comment = split_by_comment[0].rstrip()
 101         if non_comment.rstrip() == '':
 102              if inside_booking:
 103                  booking_lines += ['']
 104              continue
 105         # if we're starting a booking, parse by first-line pattern
 106         if not inside_booking:
 107             start_line = i
 108             toks = non_comment.split(maxsplit=1)
 109             date_string = toks[0]
 110             try:
 111                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
 112             except ValueError:
 113                 raise HandledException(f"{prefix} bad date string: {date_string}")
 114             if last_date > date_string:
 115                 raise HandledException(f"{prefix} out-of-order-date")
 116             last_date = date_string
 117             try:
 118                 description = toks[1]
 119             except IndexError:
 120                 raise HandledException(f"{prefix} bad description: {description}")
 121             inside_booking = True
 122             booking_lines += [non_comment]
 123             continue
 124         # otherwise, read as transfer data
 125         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 126         if len(toks) > 3:
 127             raise HandledException(f"{prefix} too many booking line tokens: {toks}")
 128         amount, currency = None, None
 129         account_name = toks[0]
 130         if account_name[0] == '[' and account_name[-1] == ']':
 131             # ignore specification's differentiation of "virtual" accounts
 132             account_name = account_name[1:-1]
 133         decimal_chars = ".-0123456789"
 134         if len(toks) == 3:
 135             i_currency = 1
 136             try:
 137                 amount = decimal.Decimal(toks[1])
 138                 i_currency = 2
 139             except decimal.InvalidOperation:
 140                 try:
 141                     amount = decimal.Decimal(toks[2])
 142                 except decimal.InvalidOperation:
 143                     raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
 144             currency = toks[i_currency]
 145             if currency[0] in decimal_chars:
 146                 raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 147         elif len(toks) == 2:
 148             value = toks[1]
 149             inside_amount = False
 150             inside_currency = False
 151             amount_string = ""
 152             currency = ""
 153             dots_counted = 0
 154             for i, c in enumerate(value):
 155                 if i == 0:
 156                     if c in decimal_chars:
 157                         inside_amount = True
 158                     else:
 159                         inside_currency = True
 160                 if inside_currency:
 161                     if c in decimal_chars and len(amount_string) == 0:
 162                         inside_currency = False
 163                         inside_amount = True
 164                     else:
 165                         currency += c
 166                         continue
 167                 if inside_amount:
 168                     if c not in decimal_chars:
 169                         if len(currency) > 0:
 170                             raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
 171                         inside_currency = True
 172                         inside_amount = False
 173                         currency += c
 174                         continue
 175                     if c == '-' and len(amount_string) > 1:
 176                         raise HandledException(f"{prefix} amount has non-start '-': {value}")
 177                     if c == '.':
 178                         if dots_counted > 1:
 179                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
 180                         dots_counted += 1
 181                     amount_string += c
 182             if len(currency) == 0:
 183                 raise HandledException(f"{prefix} currency missing: {value}")
 184             if len(amount_string) > 0:
 185                 amount = decimal.Decimal(amount_string)
 186         booking_lines += [(account_name, amount, currency)]
 187     if inside_booking:
 188         raise HandledException(f"{prefix} last booking unfinished")
 189     return bookings, comments
 190
 191
 192 class Booking:
 193
 194     def __init__(self, date_string, description, booking_lines, start_line, process=True):
 195         self.date_string = date_string
 196         self.description = description
 197         self.lines = booking_lines
 198         self.start_line = start_line
 199         if process:
 200             self.validate_booking_lines()
 201             self.sink = {}
 202             self.account_changes = self.parse_booking_lines_to_account_changes()
 203
 204     def validate_booking_lines(self):
 205         prefix = f"booking at line {self.start_line}"
 206         sums = {}
 207         empty_values = 0
 208         for line in self.lines[1:]:
 209             if line == '':
 210                 continue
 211             _, amount, currency = line
 212             if amount is None:
 213                 if empty_values > 0:
 214                     raise HandledException(f"{prefix} relates more than one empty value of same currency {currency}")
 215                 empty_values += 1
 216                 continue
 217             if currency not in sums:
 218                 sums[currency] = 0
 219             sums[currency] += amount
 220         if empty_values == 0:
 221             for k, v in sums.items():
 222                 if v != 0:
 223                     raise HandledException(f"{prefix} does not add up to zero / {k} {v}")
 224         else:
 225             sinkable = False
 226             for k, v in sums.items():
 227                 if v != 0:
 228                     sinkable = True
 229             if not sinkable:
 230                 raise HandledException(f"{prefix} has empty value that cannot be filled")
 231
 232     def parse_booking_lines_to_account_changes(self):
 233         account_changes = {}
 234         debt = {}
 235         sink_account = None
 236         for line in self.lines[1:]:
 237             if line == '':
 238                 continue
 239             account, amount, currency = line
 240             if amount is None:
 241                 sink_account = account
 242                 continue
 243             apply_booking_to_account_balances(account_changes, account, currency, amount)
 244             if currency not in debt:
 245                 debt[currency] = amount
 246             else:
 247                 debt[currency] += amount
 248         if sink_account:
 249             for currency, amount in debt.items():
 250                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 251                 self.sink[currency] = -amount
 252         return account_changes
 253
 254
 255
 256 class Database:
 257
 258     def __init__(self):
 259         db_name = "_ledger"
 260         self.db_file = db_name + ".json"
 261         self.lock_file = db_name+ ".lock"
 262         self.bookings = []
 263         self.comments = []
 264         self.real_lines = []
 265         if os.path.exists(self.db_file):
 266             with open(self.db_file, "r") as f:
 267                 self.real_lines += [l.rstrip() for l in f.readlines()]
 268         ret = parse_lines(self.real_lines)
 269         self.bookings += ret[0]
 270         self.comments += ret[1]
 271
 272     def get_lines(self, start, end):
 273         return self.real_lines[start:end]
 274
 275     def write_db(self, text, mode='w'):
 276         import shutil
 277         if os.path.exists(self.lock_file):
 278             raise HandledException('Sorry, lock file!')
 279         f = open(self.lock_file, 'w+')
 280         f.close()
 281
 282         # always back up most recent to .bak
 283         bakpath = f'{self.db_file}.bak'
 284         shutil.copy(self.db_file, bakpath)
 285
 286         # collect modification times of numbered .bak files
 287         bak_prefix = f'{bakpath}.'
 288         backup_dates = []
 289         i = 0
 290         bak_as = f'{bak_prefix}{i}'
 291         while os.path.exists(bak_as):
 292             mod_time = os.path.getmtime(bak_as)
 293             backup_dates += [str(datetime.datetime.fromtimestamp(mod_time))]
 294             i += 1
 295             bak_as = f'{bak_prefix}{i}'
 296
 297         # collect what numbered .bak files to save:
 298         # shrink datetime string right to left character by character,
 299         # on each step add the oldest file whose mtime still fits the pattern
 300         # (privilege older files to keep existing longer)
 301         to_save = []
 302         datetime_len = 19
 303         now = str(datetime.datetime.now())[:datetime_len]
 304         while datetime_len > 2:
 305             # assume backup_dates starts with oldest dates
 306             for i, date in enumerate(backup_dates):
 307                 if date[:datetime_len] == now:
 308                     if i not in to_save:
 309                         to_save += [i]
 310                         break
 311             datetime_len -= 1
 312             now = now[:datetime_len]
 313
 314         # remove redundant backup files
 315         j = 0
 316         for i in to_save:
 317             if i != j:
 318                 source = f'{bak_prefix}{i}'
 319                 target = f'{bak_prefix}{j}'
 320                 shutil.move(source, target)
 321             j += 1
 322         for i in range(j, len(backup_dates)):
 323             try:
 324                 os.remove(f'{bak_prefix}{i}')
 325             except FileNotFoundError:
 326                 pass
 327
 328         # put second backup copy of current state at end of bak list
 329         shutil.copy(self.db_file, f'{bak_prefix}{j}')
 330         with open(self.db_file, mode) as f:
 331             f.write(text);
 332         os.remove(self.lock_file)
 333
 334     def insert_at_date(self, lines, date):
 335         start_at = len(self.real_lines)
 336         for b in self.bookings:
 337             if b.date_string == date:
 338                 start_at = b.start_line
 339                 break
 340             elif b.date_string > date:
 341                 break
 342         if start_at == len(self.real_lines):
 343             lines = [''] + lines
 344         return self.write_lines_in_total_lines_at(self.real_lines, start_at, lines)
 345
 346     def update(self, start, end, lines, date):
 347         total_lines = self.real_lines[:start] + self.real_lines[end:]
 348         n_original_lines = end - start
 349         start_at = len(total_lines)
 350         for b in self.bookings:
 351             if b.date_string == date:
 352                 if start_at == len(total_lines) or b.start_line == start:
 353                     start_at = b.start_line
 354                     if b.start_line > start:
 355                         start_at -= n_original_lines
 356             elif b.date_string > date:
 357                 break
 358         if start_at == len(total_lines):
 359             lines = [''] + lines
 360         return self.write_lines_in_total_lines_at(total_lines, start_at, lines)
 361
 362     def write_lines_in_total_lines_at(self, total_lines, start_at, lines):
 363         total_lines = total_lines[:start_at] + lines + [''] + total_lines[start_at:]
 364         _, _ = parse_lines(lines)
 365         text = '\n'.join(total_lines)
 366         self.write_db(text)
 367         return start_at
 368
 369     def get_nth_for_booking_of_start_line(self, start_line):
 370         nth = 0
 371         for b in self.bookings:
 372             if b.start_line >= start_line:
 373                 break
 374             nth += 1
 375         return nth
 376
 377     def add_taxes(self, lines, finish=False):
 378         ret = []
 379         bookings, _ = parse_lines(lines)
 380         date = bookings[0].date_string
 381         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
 382         acc_kk_minimum = 'Reserves:Month:KrankenkassenDefaultBeitrag'
 383         acc_kk = 'Expenses:KrankenKasse'
 384         acc_est = 'Reserves:Einkommenssteuer'
 385         acc_assets = 'Assets'
 386         acc_buffer = 'Reserves:NeuAnfangsPuffer:Ausgaben'
 387         last_monthbreak_assets = 0
 388         last_monthbreak_est = 0
 389         last_monthbreak_kk_minimum = 0
 390         last_monthbreak_kk_add = 0
 391         buffer_expenses = 0
 392         kk_expenses = 0
 393         est_expenses = 0
 394         months_passed = -int(finish)
 395         for b in self.bookings:
 396             if date == b.date_string:
 397                 break
 398             acc_keys = b.account_changes.keys()
 399             if acc_buffer in acc_keys:
 400                 buffer_expenses -= b.account_changes[acc_buffer]['€']
 401             if acc_kk_add in acc_keys:
 402                 kk_expenses += b.account_changes[acc_kk_add]['€']
 403             if acc_kk in acc_keys:
 404                 kk_expenses += b.account_changes[acc_kk]['€']
 405             if acc_est in acc_keys:
 406                 est_expenses += b.account_changes[acc_est]['€']
 407             if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
 408                 months_passed += 1
 409                 if finish:
 410                     last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
 411                     last_monthbreak_est = b.account_changes[acc_est]['€']
 412                     last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
 413                     last_monthbreak_assets = b.account_changes[acc_buffer]['€']
 414         old_needed_income_before_anything = - last_monthbreak_assets - last_monthbreak_kk_add - last_monthbreak_kk_minimum - last_monthbreak_est
 415         if finish:
 416             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income_before_anything}€']
 417         _, account_sums = bookings_to_account_tree(bookings)
 418         expenses_so_far = -1 * account_sums[acc_assets]['€'] + old_needed_income_before_anything
 419         needed_income_before_kk = expenses_so_far
 420         ESt_this_month = 0
 421         left_over = needed_income_before_kk - ESt_this_month
 422         too_low = 0
 423         too_high = 2 * needed_income_before_kk
 424         E0 = decimal.Decimal(10908)
 425         E1 = decimal.Decimal(15999)
 426         E2 = decimal.Decimal(62809)
 427         E3 = decimal.Decimal(277825)
 428         while True:
 429             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
 430             if finish:
 431                 zvE += last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum
 432             if zvE < E0:
 433                 ESt = decimal.Decimal(0)
 434             elif zvE < E1:
 435                 y = (zvE - E0)/10000
 436                 ESt = (decimal.Decimal(979.18) * y + 1400) * y
 437             elif zvE < E2:
 438                 y = (zvE - E1)/10000
 439                 ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
 440             elif zvE < E3:
 441                 ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
 442             else:
 443                 ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
 444             ESt_this_month = (ESt + last_monthbreak_est - est_expenses) / (12 - months_passed)
 445             left_over = needed_income_before_kk - ESt_this_month
 446             if abs(left_over - expenses_so_far) < 0.001:
 447                 break
 448             elif left_over < expenses_so_far:
 449                 too_low = needed_income_before_kk
 450             elif left_over > expenses_so_far:
 451                 too_high = needed_income_before_kk
 452             needed_income_before_kk = too_low + (too_high - too_low)/2
 453         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
 454         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}€']
 455         kk_minimum_income = 1131.67
 456         if date < '2023-02-01':
 457             kk_minimum_income = decimal.Decimal(1096.67)
 458             kk_factor = decimal.Decimal(0.189)
 459             kk_minimum_tax = decimal.Decimal(207.27).quantize(decimal.Decimal('0.00'))
 460         elif date < '2023-08-01':
 461             kk_factor = decimal.Decimal(0.191)
 462             kk_minimum_tax = decimal.Decimal(216.15).quantize(decimal.Decimal('0.00'))
 463         else:
 464             kk_factor = decimal.Decimal(0.197)
 465             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
 466         kk_add_so_far = account_sums[acc_kk_add]['€'] if acc_kk_add in account_sums.keys() else 0
 467         kk_add = needed_income_before_kk / (1 - kk_factor) - needed_income_before_kk - kk_minimum_tax
 468         hit_kk_minimum_income_limit = False
 469         if kk_add_so_far + kk_add < 0:
 470             hit_kk_minimum_income_limit = True
 471             kk_add_uncorrect = kk_add
 472             kk_add = -(kk_add + kk_add_so_far)
 473         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
 474         if finish:
 475             ret += [f'  {acc_kk_add}  {-last_monthbreak_kk_add}€  ; for old assumption of needed income']
 476         else:
 477             ret += [f'  {acc_kk_minimum}  {kk_minimum_tax}€  ; assumed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}']
 478         if hit_kk_minimum_income_limit:
 479             ret += [f'  {acc_kk_add}  {kk_add}€  ; {needed_income_before_kk:.2f}€ / (1 - {kk_factor:.3f}) - {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€ = {kk_add_uncorrect:.2f}€ would reduce current {acc_kk_dd} ({kk_add_so_far:.2f}€) below 0']
 480         else:
 481             ret += [f'  {acc_kk_add}  {kk_add}€  ; {needed_income_before_kk:.2f}€ / (1 - {kk_factor:.3f}) - {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€']
 482         diff = - last_monthbreak_est + ESt_this_month - last_monthbreak_kk_add + kk_add
 483         if not finish:
 484             diff += kk_minimum_tax
 485         final_minus = expenses_so_far - old_needed_income_before_anything + diff
 486         ret += [f'  {acc_assets}  {-diff} €']
 487         ret += [f'  {acc_assets}  {final_minus} €']
 488         year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus
 489         if finish:
 490             ret += [f'  {acc_buffer}  {-final_minus} €']
 491         else:
 492             ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {year_needed}']
 493         return ret
 494
 495
 496 class MyServer(BaseHTTPRequestHandler):
 497     header = """<html>
 498 <meta charset="UTF-8">
 499 <style>
 500 body { color: #000000; }
 501 table { margin-bottom: 2em; }
 502 th, td { text-align: left }
 503 input[type=number] { text-align: right; font-family: monospace; }
 504 .money { font-family: monospace; text-align: right; }
 505 .comment { font-style: italic; color: #777777; }
 506 .meta { font-size: 0.75em; color: #777777; }
 507 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 508 </style>
 509 <body>
 510 <a href="/">ledger</a>
 511 <a href="/balance">balance</a>
 512 <a href="/add_free">add free</a>
 513 <a href="/add_structured">add structured</a>
 514 <hr />
 515 """
 516     booking_tmpl = jinja2.Template("""
 517 <p id="{{nth}}"><a href="#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
 518 <span class="meta">[edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
 519 / <a href="/add_free?start={{start}}&end={{end}}">free</a>
 520 | copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
 521 / <a href="/copy_free?start={{start}}&end={{end}}">free</a>
 522 | move {% if move_up %}<a href="/move_up?start={{start}}&end={{end}}">up</a>{% else %}up{% endif %}/{% if move_down %}<a href="/move_down?start={{start}}&end={{end}}">down</a>{% else %}down{% endif %}
 523 | <a href="/balance?stop={{nth+1}}">balance after</a>
 524 ]</span>
 525 <table>
 526 {% for l in booking_lines %}
 527 {% if l.acc %}
 528 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
 529 {% else %}
 530 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
 531 {% endif %}
 532 {% endfor %}
 533 </table></p>
 534 """)
 535     add_form_header = """<form method="POST" action="{{action|e}}">
 536 <input type="submit" name="check" value="check" />
 537 <input type="submit" name="revert" value="revert" />
 538 """
 539     add_form_footer = """
 540 <input type="hidden" name="start" value={{start}} />
 541 <input type="hidden" name="end" value={{end}} />
 542 <input type="submit" name="save" value="save!">
 543 </form>
 544 """
 545     footer = "</body>\n<html>"
 546
 547     def do_POST(self):
 548         try:
 549             parsed_url = urlparse(self.path)
 550             length = int(self.headers['content-length'])
 551             postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 552             start = int(postvars['start'][0])
 553             end = int(postvars['end'][0])
 554             db = Database()
 555             add_empty_line = None
 556             lines = []
 557             # get inputs
 558             if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 559                 lines, add_empty_line = self.booking_lines_from_postvars(postvars, db)
 560             elif '/add_free' == parsed_url.path and not 'revert' in postvars.keys():
 561                 lines = postvars['booking'][0].splitlines()
 562             # validate where appropriate
 563             if ('save' in postvars.keys()) or ('check' in postvars.keys()):
 564                 _, _ = parse_lines(lines)
 565             # if saving, process where to and where to redirect after
 566             if 'save' in postvars.keys():
 567                 last_date = str(datetime.datetime.now())[:10]
 568                 if len(db.bookings) > 0:
 569                     last_date = db.bookings[-1].date_string
 570                 target_date = last_date[:]
 571                 first_line_tokens = lines[0].split() if len(lines) > 0 else ''
 572                 first_token = first_line_tokens[0] if len(first_line_tokens) > 0 else ''
 573                 try:
 574                     datetime.datetime.strptime(first_token, '%Y-%m-%d')
 575                     target_date = first_token
 576                 except ValueError:
 577                      pass
 578                 if start == end == 0:
 579                         start = db.insert_at_date(lines, target_date)
 580                         nth = db.get_nth_for_booking_of_start_line(start)
 581                 else:
 582                     new_start = db.update(start, end, lines, target_date)
 583                     nth = db.get_nth_for_booking_of_start_line(new_start)
 584                     if new_start > start:
 585                         nth -= 1
 586                 redir_url = f'/#{nth}'
 587                 self.send_code_and_headers(302, [('Location', redir_url)])
 588             # otherwise just re-build editing form
 589             else:
 590                 if '/add_structured' == parsed_url.path:
 591                     edit_content = self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line)
 592                 else:
 593                     edit_content = self.add_free(db, start, end)
 594                 self.send_HTML(self.header + edit_content + self.footer)
 595         except HandledException as e:
 596             self.fail_400(e)
 597
 598     def do_GET(self):
 599         try:
 600             parsed_url = urlparse(self.path)
 601             params = parse_qs(parsed_url.query)
 602             start = int(params.get('start', ['0'])[0])
 603             end = int(params.get('end', ['0'])[0])
 604             db = Database()
 605             page = self.header
 606             if parsed_url.path == '/balance':
 607                 stop = params.get('stop', [None])[0]
 608                 page += self.balance_as_html(db, stop)
 609             elif parsed_url.path == '/add_free':
 610                 page += self.add_free(db, start, end)
 611             elif parsed_url.path == '/add_structured':
 612                 page += self.add_structured(db, start, end)
 613             elif parsed_url.path == '/copy_free':
 614                 page += self.add_free(db, start, end, copy=True)
 615             elif parsed_url.path == '/copy_structured':
 616                 page += self.add_structured(db, start, end, copy=True)
 617             elif parsed_url.path == '/move_up':
 618                 nth = self.move_up(db, start, end)
 619                 self.send_code_and_headers(302, [('Location', f'/#{nth}')])
 620                 return
 621             elif parsed_url.path == '/move_down':
 622                 nth = self.move_down(db, start, end)
 623                 self.send_code_and_headers(302, [('Location', f'/#{nth}')])
 624                 return
 625             else:
 626                 page += self.ledger_as_html(db)
 627             page += self.footer
 628             self.send_HTML(page)
 629         except HandledException as e:
 630             self.fail_400(e)
 631
 632     def fail_400(self, e):
 633         page = f'{self.header}ERROR: {e}{self.footer}'
 634         self.send_HTML(page, 400)
 635
 636     def send_HTML(self, html, code=200):
 637         self.send_code_and_headers(code, [('Content-type', 'text/html')])
 638         self.wfile.write(bytes(html, "utf-8"))
 639
 640     def send_code_and_headers(self, code, headers=[]):
 641         self.send_response(code)
 642         for fieldname, content in headers:
 643             self.send_header(fieldname, content)
 644         self.end_headers()
 645
 646     def booking_lines_from_postvars(self, postvars, db):
 647         add_empty_line = None
 648         date = postvars['date'][0]
 649         description = postvars['description'][0]
 650         start_comment = postvars['line_0_comment'][0]
 651         start_line = f'{date} {description}'
 652         if start_comment.rstrip() != '':
 653             start_line += f' ; {start_comment}'
 654         lines = [start_line]
 655         if 'line_0_add' in postvars.keys():
 656             add_empty_line = 0
 657         i = j = 1
 658         while f'line_{i}_comment' in postvars.keys():
 659             if f'line_{i}_delete' in postvars.keys():
 660                 i += 1
 661                 continue
 662             elif f'line_{i}_delete_after' in postvars.keys():
 663                 break
 664             elif f'line_{i}_add' in postvars.keys():
 665                 add_empty_line = j
 666             account = postvars[f'line_{i}_account'][0]
 667             amount = postvars[f'line_{i}_amount'][0]
 668             currency = postvars[f'line_{i}_currency'][0]
 669             comment = postvars[f'line_{i}_comment'][0]
 670             i += 1
 671             new_main = f'  {account}  {amount}'
 672             if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
 673                 continue
 674             if len(amount.rstrip()) > 0:
 675                 new_main += f' {currency}'
 676             j += 1
 677             new_line = new_main
 678             if comment.rstrip() != '':
 679                 new_line += f'  ; {comment}'
 680             lines += [new_line]
 681         if 'add_sink' in postvars.keys():
 682             temp_lines = lines.copy() + ['_']
 683             try:
 684                 temp_bookings, _ = parse_lines(temp_lines)
 685                 for currency in temp_bookings[0].sink:
 686                     amount = temp_bookings[0].sink[currency]
 687                     lines += [f'Assets  {amount:.2f} {currency}']
 688             except HandledException:
 689                 pass
 690         if 'add_taxes' in postvars.keys():
 691             lines += db.add_taxes(lines, finish=False)
 692         elif 'add_taxes2' in postvars.keys():
 693             lines += db.add_taxes(lines, finish=True)
 694         return lines, add_empty_line
 695
 696     def balance_as_html(self, db, until=None):
 697         bookings = db.bookings[:until if until is None else int(until)]
 698         lines = []
 699         account_tree, account_sums = bookings_to_account_tree(bookings)
 700         def print_subtree(lines, indent, node, subtree, path):
 701             line = f"{indent}{node}"
 702             n_tabs = 5 - (len(line) // 8)
 703             line += n_tabs * "\t"
 704             if "€" in account_sums[path + node].keys():
 705                 amount = account_sums[path + node]["€"]
 706                 line += f"{amount:9.2f} €\t"
 707             else:
 708                 line += f"\t\t"
 709             for currency, amount in account_sums[path + node].items():
 710                 if currency != '€' and amount > 0:
 711                     line += f"{amount:5.2f} {currency}\t"
 712             lines += [line]
 713             indent += "  "
 714             for k, v in sorted(subtree.items()):
 715                 print_subtree(lines, indent, k, v, path + node + ":")
 716         for k, v in sorted(account_tree.items()):
 717             print_subtree(lines, "", k, v, "")
 718         content = "\n".join(lines)
 719         return f"<pre>{content}</pre>"
 720
 721     def ledger_as_html(self, db):
 722         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')  ##
 723         elements_to_write = []
 724         last_i = i = 0  ##
 725         for nth, booking in enumerate(db.bookings):
 726             move_up = nth > 0 and db.bookings[nth - 1].date_string == booking.date_string
 727             move_down = nth < len(db.bookings) - 1 and db.bookings[nth + 1].date_string == booking.date_string
 728             booking_end = last_i = booking.start_line + len(booking.lines)
 729             booking_lines = []
 730             i = booking.start_line  ##
 731             elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']  ##
 732             for booking_line in booking.lines[1:]:
 733                  i += 1  ##
 734                  comment = db.comments[i]  ##
 735                  if booking_line == '':
 736                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]  ##
 737                      continue
 738                  account = booking_line[0]
 739                  money = ''
 740                  if booking_line[1] is not None:
 741                      money = f'{booking_line[1]} {booking_line[2]}'
 742                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
 743             elements_to_write += [self.booking_tmpl.render(
 744                 nth=nth,
 745                 start=booking.start_line,
 746                 end=booking_end,
 747                 date=booking.date_string,
 748                 desc=booking.description,
 749                 head_comment=db.comments[booking.start_line],
 750                 move_up=move_up,
 751                 move_down=move_down,
 752                 booking_lines = booking_lines)]
 753         elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:] if c != '']  #
 754         return '\n'.join(elements_to_write)
 755
 756     def add_free(self, db, start=0, end=0, copy=False):
 757         tmpl = jinja2.Template(self.add_form_header + """<br />
 758 <textarea name="booking" rows=10 cols=80>
 759 {% for line in lines %}{{ line }}
 760 {% endfor %}
 761 </textarea>
 762 """ + self.add_form_footer)
 763         lines = db.get_lines(start, end)
 764         if copy:
 765             start = end = 0
 766         return tmpl.render(action='add_free', start=start, end=end, lines=lines)
 767
 768     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 769         tmpl = jinja2.Template(self.add_form_header + """
 770 <input type="submit" name="add_taxes" value="add taxes" />
 771 <input type="submit" name="add_taxes2" value="add taxes2" />
 772 <input type="submit" name="add_sink" value="add sink" />
 773 <br />
 774 <input name="date" value="{{date|e}}" size=9 />
 775 <input name="description" value="{{desc|e}}" list="descriptions" />
 776 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
 777 <input type="submit" name="line_0_add" value="[+]" />
 778 <br />
 779 {% for line in booking_lines %}
 780 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
 781 <input type="number" name="line_{{line.i}}_amount" step=0.01 value="{{line.amt}}" size=10 />
 782 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
 783 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
 784 <input type="submit" name="line_{{line.i}}_delete_after" value="[XX]" />
 785 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
 786 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
 787 <br />
 788 {% endfor %}
 789 {% for name, items in datalist_sets.items() %}
 790 <datalist id="{{name}}">
 791 {% for item in items %}
 792   <option value="{{item|e}}">{{item|e}}</option>
 793 {% endfor %}
 794 </datalist>
 795 {% endfor %}
 796 """ + self.add_form_footer)
 797         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 798         bookings, comments = parse_lines(lines, validate_bookings=False)
 799         if len(bookings) > 1:
 800             raise HandledException('can only structurally edit single Booking')
 801         if add_empty_line is not None:
 802             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 803             booking = bookings[0]
 804             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 805         action = 'add_structured'
 806         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 807         for b in db.bookings:
 808             datalist_sets['descriptions'].add(b.description)
 809             for account, moneys in b.account_changes.items():
 810                 datalist_sets['accounts'].add(account)
 811                 for currency in moneys.keys():
 812                     datalist_sets['currencies'].add(currency)
 813         content = ''
 814         today = str(datetime.datetime.now())[:10]
 815         booking_lines = []
 816         if copy:
 817             start = end = 0
 818         desc = head_comment = ''
 819         if len(bookings) == 0:
 820             for i in range(1, 3):
 821                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
 822             date=today
 823         else:
 824             booking = bookings[0]
 825             desc = booking.description
 826             date = today if copy else booking.date_string
 827             head_comment=comments[0]
 828             last_line = len(comments)
 829             for i in range(1, len(comments)):
 830                 account = amount = currency = ''
 831                 if i < len(booking.lines) and booking.lines[i] != '':
 832                     account = booking.lines[i][0]
 833                     amount = booking.lines[i][1]
 834                     currency = booking.lines[i][2]
 835                 booking_lines += [{
 836                         'i': i,
 837                         'acc': account,
 838                         'amt': amount,
 839                         'curr': currency if currency else '€',
 840                         'comment': comments[i],
 841                         'comm_cols': len(comments[i])}]
 842         content += tmpl.render(
 843                 action=action,
 844                 date=date,
 845                 desc=desc,
 846                 head_comment=head_comment,
 847                 booking_lines=booking_lines,
 848                 datalist_sets=datalist_sets,
 849                 start=start,
 850                 end=end)
 851         return content
 852
 853     def move_up(self, db, start, end):
 854         prev_booking = None
 855         for redir_nth, b in enumerate(db.bookings):
 856             if b.start_line >= start:
 857                 break
 858             prev_booking = b
 859         start_at = prev_booking.start_line
 860         self.make_move(db, start, end, start_at)
 861         return redir_nth - 1
 862
 863     def move_down(self, db, start, end):
 864         next_booking = None
 865         for redir_nth, b in enumerate(db.bookings):
 866             if b.start_line > start:
 867                 next_booking = b
 868                 break
 869         start_at = next_booking.start_line + len(next_booking.lines) - (end - start) + 1
 870         self.make_move(db, start, end, start_at)
 871         return redir_nth
 872
 873     def make_move(self, db, start, end, start_at):
 874         lines = db.get_lines(start, end)
 875         total_lines = db.real_lines[:start] + db.real_lines[end:]
 876         db.write_lines_in_total_lines_at(total_lines, start_at, lines)
 877
 878
 879 if __name__ == "__main__":
 880     webServer = HTTPServer((hostName, serverPort), MyServer)
 881     print(f"Server started http://{hostName}:{serverPort}")
 882     try:
 883         webServer.serve_forever()
 884     except KeyboardInterrupt:
 885         pass
 886     webServer.server_close()
 887     print("Server stopped.")