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

   1 import os
   2 import jinja2
   3 import decimal
   4 from datetime import datetime, timedelta
   5 from urllib.parse import parse_qs, urlparse
   6 from plomlib import PlomDB, PlomException, run_server, run_server, PlomServer
   7
   8 server_port = 8082
   9 db_path = '/home/plom/org/ledger2023.dat'
  10
  11 html_head = """
  12 <style>
  13 body { color: #000000; }
  14 table { margin-bottom: 2em; }
  15 th, td { text-align: left }
  16 input[type=number] { text-align: right; font-family: monospace; }
  17 .money { font-family: monospace; text-align: right; }
  18 .comment { font-style: italic; color: #777777; }
  19 .meta { font-size: 0.75em; color: #777777; }
  20 .full_line_comment { display: block; white-space: nowrap; width: 0; }
  21 </style>
  22 <body>
  23 <a href="/">ledger</a>
  24 <a href="/balance">balance</a>
  25 <a href="/add_free">add free</a>
  26 <a href="/add_structured">add structured</a>
  27 <hr />
  28 """
  29 booking_html = """
  30 <p id="{{nth}}"><a href="#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
  31 <span class="meta">[edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
  32 / <a href="/add_free?start={{start}}&end={{end}}">free</a>
  33 | copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
  34 / <a href="/copy_free?start={{start}}&end={{end}}">free</a>
  35 | 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 %}
  36 | <a href="/balance?stop={{nth+1}}">balance after</a>
  37 ]</span>
  38 <table>
  39 {% for l in booking_lines %}
  40 {% if l.acc %}
  41 <tr><td>{{l.acc|e}}</td><td class="money">{{l.money|e}}</td><td class="comment">{{l.comment|e}}</td></tr>
  42 {% else %}
  43 <tr><td><div class="comment full_line_comment">{{l.comment|e}}</div></td></tr>
  44 {% endif %}
  45 {% endfor %}
  46 </table></p>
  47 """
  48 add_form_header = """<form method="POST" action="{{action|e}}">
  49 <input type="submit" name="check" value="check" />
  50 <input type="submit" name="revert" value="revert" />
  51 """
  52 add_form_footer = """
  53 <input type="hidden" name="start" value={{start}} />
  54 <input type="hidden" name="end" value={{end}} />
  55 <input type="submit" name="save" value="save!">
  56 </form>
  57 """
  58 add_free_html = """<br />
  59 <textarea name="booking" rows=10 cols=80>
  60 {% for line in lines %}{{ line }}
  61 {% endfor %}
  62 </textarea>
  63 """
  64 add_structured_html = """
  65 <input type="submit" name="add_taxes" value="add taxes" />
  66 <input type="submit" name="add_taxes2" value="add taxes2" />
  67 <input type="submit" name="add_sink" value="add sink" />
  68 <br />
  69 <input name="date" value="{{date|e}}" size=9 />
  70 <input name="description" value="{{desc|e}}" list="descriptions" />
  71 <textarea name="line_0_comment" rows=1 cols=20>{{head_comment|e}}</textarea>
  72 <input type="submit" name="line_0_add" value="[+]" />
  73 <br />
  74 {% for line in booking_lines %}
  75 <input name="line_{{line.i}}_account" value="{{line.acc|e}}" size=40 list="accounts" />
  76 <input type="number" name="line_{{line.i}}_amount" step=0.01 value="{{line.amt}}" size=10 />
  77 <input name="line_{{line.i}}_currency" value="{{line.curr|e}}" size=3 list="currencies" />
  78 <input type="submit" name="line_{{line.i}}_delete" value="[x]" />
  79 <input type="submit" name="line_{{line.i}}_delete_after" value="[XX]" />
  80 <input type="submit" name="line_{{line.i}}_add" value="[+]" />
  81 <textarea name="line_{{line.i}}_comment" rows=1 cols={% if line.comm_cols %}{{line.comm_cols}}{% else %}20{% endif %}>{{line.comment|e}}</textarea>
  82 <br />
  83 {% endfor %}
  84 {% for name, items in datalist_sets.items() %}
  85 <datalist id="{{name}}">
  86 {% for item in items %}
  87   <option value="{{item|e}}">{{item|e}}</option>
  88 {% endfor %}
  89 </datalist>
  90 {% endfor %}
  91 """
  92
  93
  94 def apply_booking_to_account_balances(account_sums, account, currency, amount):
  95     if not account in account_sums:
  96         account_sums[account] = {currency: amount}
  97     elif not currency in account_sums[account].keys():
  98         account_sums[account][currency] = amount
  99     else:
 100         account_sums[account][currency] += amount
 101
 102
 103 def bookings_to_account_tree(bookings):
 104     account_sums = {}
 105     for booking in bookings:
 106         for account, changes in booking.account_changes.items():
 107             for currency, amount in changes.items():
 108                 apply_booking_to_account_balances(account_sums, account, currency, amount)
 109     account_tree = {}
 110     def collect_branches(account_name, path):
 111         node = account_tree
 112         path_copy = path[:]
 113         while len(path_copy) > 0:
 114             step = path_copy.pop(0)
 115             node = node[step]
 116         toks = account_name.split(":", maxsplit=1)
 117         parent = toks[0]
 118         if parent in node.keys():
 119             child = node[parent]
 120         else:
 121             child = {}
 122             node[parent] = child
 123         if len(toks) == 2:
 124             k, v = collect_branches(toks[1], path + [parent])
 125             if k not in child.keys():
 126                 child[k] = v
 127             else:
 128                 child[k].update(v)
 129         return parent, child
 130     for account_name in sorted(account_sums.keys()):
 131         k, v = collect_branches(account_name, [])
 132         if k not in account_tree.keys():
 133             account_tree[k] = v
 134         else:
 135             account_tree[k].update(v)
 136     def collect_totals(parent_path, tree_node):
 137         for k, v in tree_node.items():
 138             child_path = parent_path + ":" + k
 139             for currency, amount in collect_totals(child_path, v).items():
 140                 apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
 141         return account_sums[parent_path]
 142     for account_name in account_tree.keys():
 143         account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
 144     return account_tree, account_sums
 145
 146
 147 def parse_lines(lines, validate_bookings=True):
 148     inside_booking = False
 149     date_string, description = None, None
 150     booking_lines = []
 151     start_line = 0
 152     bookings = []
 153     comments = []
 154     lines = lines.copy() + [''] # to ensure a booking-ending last line
 155     last_date = ''
 156     for i, line in enumerate(lines):
 157         prefix = f"line {i}"
 158         # we start with the case of an utterly empty line
 159         comments += [""]
 160         stripped_line = line.rstrip()
 161         if stripped_line == '':
 162             if inside_booking:
 163                 # assume we finished a booking, finalize, and commit to DB
 164                 if len(booking_lines) < 2:
 165                     raise PlomException(f"{prefix} booking ends to early")
 166                 booking = Booking(date_string, description, booking_lines, start_line, validate_bookings)
 167                 bookings += [booking]
 168             # expect new booking to follow so re-zeroall booking data
 169             inside_booking = False
 170             date_string, description = None, None
 171             booking_lines = []
 172             continue
 173         # if non-empty line, first get comment if any, and commit to DB
 174         split_by_comment = stripped_line.split(sep=";", maxsplit=1)
 175         if len(split_by_comment) == 2:
 176             comments[i] = split_by_comment[1].lstrip()
 177         # 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
 178         non_comment = split_by_comment[0].rstrip()
 179         if non_comment.rstrip() == '':
 180              if inside_booking:
 181                  booking_lines += ['']
 182              continue
 183         # if we're starting a booking, parse by first-line pattern
 184         if not inside_booking:
 185             start_line = i
 186             toks = non_comment.split(maxsplit=1)
 187             date_string = toks[0]
 188             try:
 189                 datetime.strptime(date_string, '%Y-%m-%d')
 190             except ValueError:
 191                 raise PlomException(f"{prefix} bad date string: {date_string}")
 192             if last_date > date_string:
 193                 raise PlomException(f"{prefix} out-of-order-date")
 194             last_date = date_string
 195             try:
 196                 description = toks[1]
 197             except IndexError:
 198                 raise PlomException(f"{prefix} bad description: {description}")
 199             inside_booking = True
 200             booking_lines += [non_comment]
 201             continue
 202         # otherwise, read as transfer data
 203         toks = non_comment.split()  # ignore specification's allowance of single spaces in names
 204         if len(toks) > 3:
 205             raise PlomException(f"{prefix} too many booking line tokens: {toks}")
 206         amount, currency = None, None
 207         account_name = toks[0]
 208         if account_name[0] == '[' and account_name[-1] == ']':
 209             # ignore specification's differentiation of "virtual" accounts
 210             account_name = account_name[1:-1]
 211         decimal_chars = ".-0123456789"
 212         if len(toks) == 3:
 213             i_currency = 1
 214             try:
 215                 amount = decimal.Decimal(toks[1])
 216                 i_currency = 2
 217             except decimal.InvalidOperation:
 218                 try:
 219                     amount = decimal.Decimal(toks[2])
 220                 except decimal.InvalidOperation:
 221                     raise PlomException(f"{prefix} no decimal number in: {toks[1:]}")
 222             currency = toks[i_currency]
 223             if currency[0] in decimal_chars:
 224                 raise PlomException(f"{prefix} currency starts with int, dot, or minus: {currency}")
 225         elif len(toks) == 2:
 226             value = toks[1]
 227             inside_amount = False
 228             inside_currency = False
 229             amount_string = ""
 230             currency = ""
 231             dots_counted = 0
 232             for i, c in enumerate(value):
 233                 if i == 0:
 234                     if c in decimal_chars:
 235                         inside_amount = True
 236                     else:
 237                         inside_currency = True
 238                 if inside_currency:
 239                     if c in decimal_chars and len(amount_string) == 0:
 240                         inside_currency = False
 241                         inside_amount = True
 242                     else:
 243                         currency += c
 244                         continue
 245                 if inside_amount:
 246                     if c not in decimal_chars:
 247                         if len(currency) > 0:
 248                             raise PlomException(f"{prefix} amount has non-decimal chars: {value}")
 249                         inside_currency = True
 250                         inside_amount = False
 251                         currency += c
 252                         continue
 253                     if c == '-' and len(amount_string) > 1:
 254                         raise PlomException(f"{prefix} amount has non-start '-': {value}")
 255                     if c == '.':
 256                         if dots_counted > 1:
 257                             raise PlomException(f"{prefix} amount has multiple dots: {value}")
 258                         dots_counted += 1
 259                     amount_string += c
 260             if len(currency) == 0:
 261                 raise PlomException(f"{prefix} currency missing: {value}")
 262             if len(amount_string) > 0:
 263                 amount = decimal.Decimal(amount_string)
 264         booking_lines += [(account_name, amount, currency)]
 265     if inside_booking:
 266         raise PlomException(f"{prefix} last booking unfinished")
 267     return bookings, comments
 268
 269
 270 class Booking:
 271
 272     def __init__(self, date_string, description, booking_lines, start_line, process=True):
 273         self.date_string = date_string
 274         self.description = description
 275         self.lines = booking_lines
 276         self.start_line = start_line
 277         if process:
 278             self.validate_booking_lines()
 279             self.sink = {}
 280             self.account_changes = self.parse_booking_lines_to_account_changes()
 281
 282     def validate_booking_lines(self):
 283         prefix = f"booking at line {self.start_line}"
 284         sums = {}
 285         empty_values = 0
 286         for line in self.lines[1:]:
 287             if line == '':
 288                 continue
 289             _, amount, currency = line
 290             if amount is None:
 291                 if empty_values > 0:
 292                     raise PlomException(f"{prefix} relates more than one empty value of same currency {currency}")
 293                 empty_values += 1
 294                 continue
 295             if currency not in sums:
 296                 sums[currency] = 0
 297             sums[currency] += amount
 298         if empty_values == 0:
 299             for k, v in sums.items():
 300                 if v != 0:
 301                     raise PlomException(f"{prefix} does not add up to zero / {k} {v}")
 302         else:
 303             sinkable = False
 304             for k, v in sums.items():
 305                 if v != 0:
 306                     sinkable = True
 307             if not sinkable:
 308                 raise PlomException(f"{prefix} has empty value that cannot be filled")
 309
 310     def parse_booking_lines_to_account_changes(self):
 311         account_changes = {}
 312         debt = {}
 313         sink_account = None
 314         for line in self.lines[1:]:
 315             if line == '':
 316                 continue
 317             account, amount, currency = line
 318             if amount is None:
 319                 sink_account = account
 320                 continue
 321             apply_booking_to_account_balances(account_changes, account, currency, amount)
 322             if currency not in debt:
 323                 debt[currency] = amount
 324             else:
 325                 debt[currency] += amount
 326         if sink_account:
 327             for currency, amount in debt.items():
 328                 apply_booking_to_account_balances(account_changes, sink_account, currency, -amount)
 329                 self.sink[currency] = -amount
 330         return account_changes
 331
 332
 333
 334 class LedgerDB(PlomDB):
 335
 336     def __init__(self):
 337         self.bookings = []
 338         self.comments = []
 339         self.real_lines = []
 340         super().__init__(db_path)
 341         ret = parse_lines(self.real_lines)
 342         self.bookings += ret[0]
 343         self.comments += ret[1]
 344
 345     def read_db_file(self, f):
 346         self.real_lines += [l.rstrip() for l in f.readlines()]
 347
 348     def get_lines(self, start, end):
 349         return self.real_lines[start:end]
 350
 351     def write_db(self, text, mode='w'):
 352         self.write_text_to_db(text)
 353
 354     def insert_at_date(self, lines, date):
 355         start_at = len(self.real_lines)
 356         for b in self.bookings:
 357             if b.date_string == date:
 358                 start_at = b.start_line
 359                 break
 360             elif b.date_string > date:
 361                 break
 362         if start_at == len(self.real_lines):
 363             lines = [''] + lines
 364         return self.write_lines_in_total_lines_at(self.real_lines, start_at, lines)
 365
 366     def update(self, start, end, lines, date):
 367         total_lines = self.real_lines[:start] + self.real_lines[end:]
 368         n_original_lines = end - start
 369         start_at = len(total_lines)
 370         for b in self.bookings:
 371             if b.date_string == date:
 372                 if start_at == len(total_lines) or b.start_line == start:
 373                     start_at = b.start_line
 374                     if b.start_line > start:
 375                         start_at -= n_original_lines
 376             elif b.date_string > date:
 377                 break
 378         if start_at == len(total_lines):
 379             lines = [''] + lines
 380         return self.write_lines_in_total_lines_at(total_lines, start_at, lines)
 381
 382     def write_lines_in_total_lines_at(self, total_lines, start_at, lines):
 383         total_lines = total_lines[:start_at] + lines + [''] + total_lines[start_at:]
 384         _, _ = parse_lines(lines)
 385         text = '\n'.join(total_lines)
 386         self.write_db(text)
 387         return start_at
 388
 389     def get_nth_for_booking_of_start_line(self, start_line):
 390         nth = 0
 391         for b in self.bookings:
 392             if b.start_line >= start_line:
 393                 break
 394             nth += 1
 395         return nth
 396
 397     def add_taxes(self, lines, finish=False):
 398         ret = []
 399         bookings, _ = parse_lines(lines)
 400         date = bookings[0].date_string
 401         acc_kk_add = 'Reserves:KrankenkassenBeitragsWachstum'
 402         acc_kk_minimum = 'Reserves:Month:KrankenkassenDefaultBeitrag'
 403         acc_kk = 'Expenses:KrankenKasse'
 404         acc_est = 'Reserves:Einkommenssteuer'
 405         acc_assets = 'Assets'
 406         acc_buffer = 'Reserves:NeuAnfangsPuffer:Ausgaben'
 407         last_monthbreak_assets = 0
 408         last_monthbreak_est = 0
 409         last_monthbreak_kk_minimum = 0
 410         last_monthbreak_kk_add = 0
 411         buffer_expenses = 0
 412         kk_expenses = 0
 413         est_expenses = 0
 414         months_passed = -int(finish)
 415         for b in self.bookings:
 416             if date == b.date_string:
 417                 break
 418             acc_keys = b.account_changes.keys()
 419             if acc_buffer in acc_keys:
 420                 buffer_expenses -= b.account_changes[acc_buffer]['€']
 421             if acc_kk_add in acc_keys:
 422                 kk_expenses += b.account_changes[acc_kk_add]['€']
 423             if acc_kk in acc_keys:
 424                 kk_expenses += b.account_changes[acc_kk]['€']
 425             if acc_est in acc_keys:
 426                 est_expenses += b.account_changes[acc_est]['€']
 427             if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
 428                 months_passed += 1
 429                 if finish:
 430                     last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
 431                     last_monthbreak_est = b.account_changes[acc_est]['€']
 432                     last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
 433                     last_monthbreak_assets = b.account_changes[acc_buffer]['€']
 434         old_needed_income_before_anything = - last_monthbreak_assets - last_monthbreak_kk_add - last_monthbreak_kk_minimum - last_monthbreak_est
 435         if finish:
 436             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income_before_anything}€']
 437         _, account_sums = bookings_to_account_tree(bookings)
 438         expenses_so_far = -1 * account_sums[acc_assets]['€'] + old_needed_income_before_anything
 439         needed_income_before_kk = expenses_so_far
 440         ESt_this_month = 0
 441         left_over = needed_income_before_kk - ESt_this_month
 442         too_low = 0
 443         too_high = 2 * needed_income_before_kk
 444         E0 = decimal.Decimal(10908)
 445         E1 = decimal.Decimal(15999)
 446         E2 = decimal.Decimal(62809)
 447         E3 = decimal.Decimal(277825)
 448         while True:
 449             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
 450             if finish:
 451                 zvE += last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum
 452             if zvE < E0:
 453                 ESt = decimal.Decimal(0)
 454             elif zvE < E1:
 455                 y = (zvE - E0)/10000
 456                 ESt = (decimal.Decimal(979.18) * y + 1400) * y
 457             elif zvE < E2:
 458                 y = (zvE - E1)/10000
 459                 ESt = (decimal.Decimal(192.59) * y + 2397) * y + decimal.Decimal(966.53)
 460             elif zvE < E3:
 461                 ESt = decimal.Decimal(0.42) * (zvE - decimal.Decimal(62809))  + decimal.Decimal(16405.54)
 462             else:
 463                 ESt = decimal.Decimal(0.45) * (zvE - decimal.Decimal(277825)) + decimal.Decimal(106713.52)
 464             ESt_this_month = (ESt + last_monthbreak_est - est_expenses) / (12 - months_passed)
 465             left_over = needed_income_before_kk - ESt_this_month
 466             if abs(left_over - expenses_so_far) < 0.001:
 467                 break
 468             elif left_over < expenses_so_far:
 469                 too_low = needed_income_before_kk
 470             elif left_over > expenses_so_far:
 471                 too_high = needed_income_before_kk
 472             needed_income_before_kk = too_low + (too_high - too_low)/2
 473         ESt_this_month = ESt_this_month.quantize(decimal.Decimal('0.00'))
 474         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}€']
 475         kk_minimum_income = 1131.67
 476         if date < '2023-02-01':
 477             kk_minimum_income = decimal.Decimal(1096.67)
 478             kk_factor = decimal.Decimal(0.189)
 479             kk_minimum_tax = decimal.Decimal(207.27).quantize(decimal.Decimal('0.00'))
 480         elif date < '2023-08-01':
 481             kk_factor = decimal.Decimal(0.191)
 482             kk_minimum_tax = decimal.Decimal(216.15).quantize(decimal.Decimal('0.00'))
 483         else:
 484             kk_factor = decimal.Decimal(0.197)
 485             kk_minimum_tax = decimal.Decimal(222.94).quantize(decimal.Decimal('0.00'))
 486         kk_add_so_far = account_sums[acc_kk_add]['€'] if acc_kk_add in account_sums.keys() else 0
 487         kk_add = needed_income_before_kk / (1 - kk_factor) - needed_income_before_kk - kk_minimum_tax
 488         hit_kk_minimum_income_limit = False
 489         if kk_add_so_far + kk_add < 0:
 490             hit_kk_minimum_income_limit = True
 491             kk_add_uncorrect = kk_add
 492             kk_add = -(kk_add + kk_add_so_far)
 493         kk_add = decimal.Decimal(kk_add).quantize(decimal.Decimal('0.00'))
 494         if finish:
 495             ret += [f'  {acc_kk_add}  {-last_monthbreak_kk_add}€  ; for old assumption of needed income']
 496         else:
 497             ret += [f'  {acc_kk_minimum}  {kk_minimum_tax}€  ; assumed minimum income {kk_minimum_income:.2f}€ * {kk_factor:.3f}']
 498         if hit_kk_minimum_income_limit:
 499             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']
 500         else:
 501             ret += [f'  {acc_kk_add}  {kk_add}€  ; {needed_income_before_kk:.2f}€ / (1 - {kk_factor:.3f}) - {needed_income_before_kk:.2f}€ - {kk_minimum_tax}€']
 502         diff = - last_monthbreak_est + ESt_this_month - last_monthbreak_kk_add + kk_add
 503         if not finish:
 504             diff += kk_minimum_tax
 505         final_minus = expenses_so_far - old_needed_income_before_anything + diff
 506         ret += [f'  {acc_assets}  {-diff} €']
 507         ret += [f'  {acc_assets}  {final_minus} €']
 508         year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus
 509         if finish:
 510             ret += [f'  {acc_buffer}  {-final_minus} €']
 511         else:
 512             ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {year_needed}']
 513         return ret
 514
 515
 516 class LedgerServer(PlomServer):
 517
 518     def pre_init(self):
 519         self.html_head += [html_head]
 520
 521     def do_POST(self):
 522         try:
 523             parsed_url = urlparse(self.path)
 524             length = int(self.headers['content-length'])
 525             postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
 526             start = int(postvars['start'][0])
 527             end = int(postvars['end'][0])
 528             db = LedgerDB()
 529             add_empty_line = None
 530             lines = []
 531             # get inputs
 532             if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
 533                 lines, add_empty_line = self.booking_lines_from_postvars(postvars, db)
 534             elif '/add_free' == parsed_url.path and not 'revert' in postvars.keys():
 535                 lines = postvars['booking'][0].splitlines()
 536             # validate where appropriate
 537             if ('save' in postvars.keys()) or ('check' in postvars.keys()):
 538                 _, _ = parse_lines(lines)
 539             # if saving, process where to and where to redirect after
 540             if 'save' in postvars.keys():
 541                 last_date = str(datetime.now())[:10]
 542                 if len(db.bookings) > 0:
 543                     last_date = db.bookings[-1].date_string
 544                 target_date = last_date[:]
 545                 first_line_tokens = lines[0].split() if len(lines) > 0 else ''
 546                 first_token = first_line_tokens[0] if len(first_line_tokens) > 0 else ''
 547                 try:
 548                     datetime.strptime(first_token, '%Y-%m-%d')
 549                     target_date = first_token
 550                 except ValueError:
 551                      pass
 552                 if start == end == 0:
 553                     start = db.insert_at_date(lines, target_date)
 554                     nth = db.get_nth_for_booking_of_start_line(start)
 555                 else:
 556                     new_start = db.update(start, end, lines, target_date)
 557                     nth = db.get_nth_for_booking_of_start_line(new_start)
 558                     if new_start > start:
 559                         nth -= 1
 560                 self.redirect( f'/#{nth}')
 561             # otherwise just re-build editing form
 562             else:
 563                 if '/add_structured' == parsed_url.path:
 564                     edit_content = self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line)
 565                 else:
 566                     edit_content = self.add_free(db, start, end)
 567                 self.send_HTML(edit_content)
 568         except PlomException as e:
 569             self.fail_400(e)
 570
 571     def do_GET(self):
 572         try:
 573             parsed_url = urlparse(self.path)
 574             params = parse_qs(parsed_url.query)
 575             start = int(params.get('start', ['0'])[0])
 576             end = int(params.get('end', ['0'])[0])
 577             db = LedgerDB()
 578             if parsed_url.path == '/balance':
 579                 stop = params.get('stop', [None])[0]
 580                 page = self.balance_as_html(db, stop)
 581             elif parsed_url.path == '/add_free':
 582                 page = self.add_free(db, start, end)
 583             elif parsed_url.path == '/add_structured':
 584                 page = self.add_structured(db, start, end)
 585             elif parsed_url.path == '/copy_free':
 586                 page = self.add_free(db, start, end, copy=True)
 587             elif parsed_url.path == '/copy_structured':
 588                 page = self.add_structured(db, start, end, copy=True)
 589             elif parsed_url.path == '/move_up':
 590                 nth = self.move_up(db, start, end)
 591                 self.redirect(f'/#{nth}')
 592                 return
 593             elif parsed_url.path == '/move_down':
 594                 nth = self.move_down(db, start, end)
 595                 self.redirect(f'/#{nth}')
 596                 return
 597             else:
 598                 page = self.ledger_as_html(db)
 599             self.send_HTML(page)
 600         except PlomException as e:
 601             self.fail_400(e)
 602
 603     def booking_lines_from_postvars(self, postvars, db):
 604         add_empty_line = None
 605         date = postvars['date'][0]
 606         description = postvars['description'][0]
 607         start_comment = postvars['line_0_comment'][0]
 608         start_line = f'{date} {description}'
 609         if start_comment.rstrip() != '':
 610             start_line += f' ; {start_comment}'
 611         lines = [start_line]
 612         if 'line_0_add' in postvars.keys():
 613             add_empty_line = 0
 614         i = j = 1
 615         while f'line_{i}_comment' in postvars.keys():
 616             if f'line_{i}_delete' in postvars.keys():
 617                 i += 1
 618                 continue
 619             elif f'line_{i}_delete_after' in postvars.keys():
 620                 break
 621             elif f'line_{i}_add' in postvars.keys():
 622                 add_empty_line = j
 623             account = postvars[f'line_{i}_account'][0]
 624             amount = postvars[f'line_{i}_amount'][0]
 625             currency = postvars[f'line_{i}_currency'][0]
 626             comment = postvars[f'line_{i}_comment'][0]
 627             i += 1
 628             new_main = f'  {account}  {amount}'
 629             if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
 630                 continue
 631             if len(amount.rstrip()) > 0:
 632                 new_main += f' {currency}'
 633             j += 1
 634             new_line = new_main
 635             if comment.rstrip() != '':
 636                 new_line += f'  ; {comment}'
 637             lines += [new_line]
 638         if 'add_sink' in postvars.keys():
 639             temp_lines = lines.copy() + ['_']
 640             try:
 641                 temp_bookings, _ = parse_lines(temp_lines)
 642                 for currency in temp_bookings[0].sink:
 643                     amount = temp_bookings[0].sink[currency]
 644                     lines += [f'Assets  {amount:.2f} {currency}']
 645             except PlomException:
 646                 pass
 647         if 'add_taxes' in postvars.keys():
 648             lines += db.add_taxes(lines, finish=False)
 649         elif 'add_taxes2' in postvars.keys():
 650             lines += db.add_taxes(lines, finish=True)
 651         return lines, add_empty_line
 652
 653     def balance_as_html(self, db, until=None):
 654         bookings = db.bookings[:until if until is None else int(until)]
 655         lines = []
 656         account_tree, account_sums = bookings_to_account_tree(bookings)
 657         def print_subtree(lines, indent, node, subtree, path):
 658             line = f"{indent}{node}"
 659             n_tabs = 5 - (len(line) // 8)
 660             line += n_tabs * "\t"
 661             if "€" in account_sums[path + node].keys():
 662                 amount = account_sums[path + node]["€"]
 663                 line += f"{amount:9.2f} €\t"
 664             else:
 665                 line += f"\t\t"
 666             for currency, amount in account_sums[path + node].items():
 667                 if currency != '€' and amount > 0:
 668                     line += f"{amount:5.2f} {currency}\t"
 669             lines += [line]
 670             indent += "  "
 671             for k, v in sorted(subtree.items()):
 672                 print_subtree(lines, indent, k, v, path + node + ":")
 673         for k, v in sorted(account_tree.items()):
 674             print_subtree(lines, "", k, v, "")
 675         content = "\n".join(lines)
 676         return f"<pre>{content}</pre>"
 677
 678     def ledger_as_html(self, db):
 679         booking_tmpl = jinja2.Template(booking_html)
 680         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')  ##
 681         elements_to_write = []
 682         last_i = i = 0  ##
 683         for nth, booking in enumerate(db.bookings):
 684             move_up = nth > 0 and db.bookings[nth - 1].date_string == booking.date_string
 685             move_down = nth < len(db.bookings) - 1 and db.bookings[nth + 1].date_string == booking.date_string
 686             booking_end = last_i = booking.start_line + len(booking.lines)
 687             booking_lines = []
 688             i = booking.start_line  ##
 689             elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']  ##
 690             for booking_line in booking.lines[1:]:
 691                  i += 1  ##
 692                  comment = db.comments[i]  ##
 693                  if booking_line == '':
 694                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]  ##
 695                      continue
 696                  account = booking_line[0]
 697                  money = ''
 698                  if booking_line[1] is not None:
 699                      money = f'{booking_line[1]} {booking_line[2]}'
 700                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
 701             elements_to_write += [booking_tmpl.render(
 702                 nth=nth,
 703                 start=booking.start_line,
 704                 end=booking_end,
 705                 date=booking.date_string,
 706                 desc=booking.description,
 707                 head_comment=db.comments[booking.start_line],
 708                 move_up=move_up,
 709                 move_down=move_down,
 710                 booking_lines = booking_lines)]
 711         elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:] if c != '']  #
 712         return '\n'.join(elements_to_write)
 713
 714     def add_free(self, db, start=0, end=0, copy=False):
 715         tmpl = jinja2.Template(add_form_header + add_free_html + add_form_footer)
 716         lines = db.get_lines(start, end)
 717         if copy:
 718             start = end = 0
 719         return tmpl.render(action='add_free', start=start, end=end, lines=lines)
 720
 721     def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
 722         tmpl = jinja2.Template(add_form_header + add_structured_html + add_form_footer)
 723         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
 724         bookings, comments = parse_lines(lines, validate_bookings=False)
 725         if len(bookings) > 1:
 726             raise PlomException('can only structurally edit single Booking')
 727         if add_empty_line is not None:
 728             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
 729             booking = bookings[0]
 730             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
 731         action = 'add_structured'
 732         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
 733         for b in db.bookings:
 734             datalist_sets['descriptions'].add(b.description)
 735             for account, moneys in b.account_changes.items():
 736                 datalist_sets['accounts'].add(account)
 737                 for currency in moneys.keys():
 738                     datalist_sets['currencies'].add(currency)
 739         content = ''
 740         today = str(datetime.now())[:10]
 741         booking_lines = []
 742         if copy:
 743             start = end = 0
 744         desc = head_comment = ''
 745         if len(bookings) == 0:
 746             for i in range(1, 3):
 747                 booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
 748             date=today
 749         else:
 750             booking = bookings[0]
 751             desc = booking.description
 752             date = today if copy else booking.date_string
 753             head_comment=comments[0]
 754             last_line = len(comments)
 755             for i in range(1, len(comments)):
 756                 account = amount = currency = ''
 757                 if i < len(booking.lines) and booking.lines[i] != '':
 758                     account = booking.lines[i][0]
 759                     amount = booking.lines[i][1]
 760                     currency = booking.lines[i][2]
 761                 booking_lines += [{
 762                         'i': i,
 763                         'acc': account,
 764                         'amt': amount,
 765                         'curr': currency if currency else '€',
 766                         'comment': comments[i],
 767                         'comm_cols': len(comments[i])}]
 768         content += tmpl.render(
 769                 action=action,
 770                 date=date,
 771                 desc=desc,
 772                 head_comment=head_comment,
 773                 booking_lines=booking_lines,
 774                 datalist_sets=datalist_sets,
 775                 start=start,
 776                 end=end)
 777         return content
 778
 779     def move_up(self, db, start, end):
 780         prev_booking = None
 781         for redir_nth, b in enumerate(db.bookings):
 782             if b.start_line >= start:
 783                 break
 784             prev_booking = b
 785         start_at = prev_booking.start_line
 786         self.make_move(db, start, end, start_at)
 787         return redir_nth - 1
 788
 789     def move_down(self, db, start, end):
 790         next_booking = None
 791         for redir_nth, b in enumerate(db.bookings):
 792             if b.start_line > start:
 793                 next_booking = b
 794                 break
 795         start_at = next_booking.start_line + len(next_booking.lines) - (end - start) + 1
 796         self.make_move(db, start, end, start_at)
 797         return redir_nth
 798
 799     def make_move(self, db, start, end, start_at):
 800         lines = db.get_lines(start, end)
 801         total_lines = db.real_lines[:start] + db.real_lines[end:]
 802         db.write_lines_in_total_lines_at(total_lines, start_at, lines)
 803
 804
 805 if __name__ == "__main__":
 806     run_server(server_port, LedgerServer)