From: Christian Heller <c.heller@plomlompom.de>
Date: Sat, 4 Nov 2023 05:14:35 +0000 (+0100)
Subject: Improve ledger.py.
X-Git-Url: https://plomlompom.com/repos/%7B%7Bdb.prefix%7D%7D/%7B%7B%20web_path%20%7D%7D/decks/%7B%7Btodo.comment%7D%7D?a=commitdiff_plain;h=169d6b20b9f3d63508180971426db3bc195a3581;p=misc

Improve ledger.py.
---

diff --git a/ledger.py b/ledger.py
index 6e0a482..b93b202 100755
--- a/ledger.py
+++ b/ledger.py
@@ -4,6 +4,7 @@ import os
 import html
 import jinja2
 import decimal
+import datetime
 from urllib.parse import parse_qs, urlparse
 hostName = "localhost"
 serverPort = 8082
@@ -80,6 +81,7 @@ def parse_lines(lines, validate_bookings=True):
     bookings = []
     comments = []
     lines = lines.copy() + [''] # to ensure a booking-ending last line
+    last_date = ''
     for i, line in enumerate(lines):
         prefix = f"line {i}"
         # we start with the case of an utterly empty line
@@ -116,6 +118,9 @@ def parse_lines(lines, validate_bookings=True):
                 datetime.datetime.strptime(date_string, '%Y-%m-%d')
             except ValueError:
                 raise HandledException(f"{prefix} bad date string: {date_string}")
+            if last_date > date_string:
+                raise HandledException(f"{prefix} out-of-order-date")
+            last_date = date_string
             try:
                 description = toks[1]
             except IndexError:
@@ -181,11 +186,10 @@ def parse_lines(lines, validate_bookings=True):
                             raise HandledException(f"{prefix} amount has multiple dots: {value}")
                         dots_counted += 1
                     amount_string += c
-            if len(amount_string) == 0:
-                raise HandledException(f"{prefix} amount missing: {value}")
             if len(currency) == 0:
                 raise HandledException(f"{prefix} currency missing: {value}")
-            amount = decimal.Decimal(amount_string)
+            if len(amount_string) > 0:
+                amount = decimal.Decimal(amount_string)
         booking_lines += [(account_name, amount, currency)]
     if inside_booking:
         raise HandledException(f"{prefix} last booking unfinished")
@@ -275,31 +279,72 @@ class Database:
     def get_lines(self, start, end):
         return self.real_lines[start:end]
 
-    def replace(self, start, end, lines):
+    def write_db(self, text, mode='w'):
         import shutil
         if os.path.exists(self.lock_file):
             raise HandledException('Sorry, lock file!')
-        if os.path.exists(self.db_file):
-            shutil.copy(self.db_file, self.db_file + ".bak")
         f = open(self.lock_file, 'w+')
         f.close()
-        total_lines = self.real_lines[:start] + lines + self.real_lines[end:]
-        text = '\n'.join(total_lines)
-        with open(self.db_file, 'w') as f:
+
+        # always back up most recent to .bak
+        bakpath = f'{self.db_file}.bak'
+        shutil.copy(self.db_file, bakpath)
+
+        # collect modification times of numbered .bak files
+        bak_prefix = f'{bakpath}.'
+        backup_dates = []
+        i = 0
+        bak_as = f'{bak_prefix}{i}'
+        while os.path.exists(bak_as):
+            mod_time = os.path.getmtime(bak_as)
+            backup_dates += [str(datetime.datetime.fromtimestamp(mod_time))]
+            i += 1
+            bak_as = f'{bak_prefix}{i}'
+
+        # collect what numbered .bak files to save
+        to_save = []
+        datetime_len = 19
+        now = str(datetime.datetime.now())[:datetime_len]
+        while datetime_len > 2:
+            for i, date in reversed(list(enumerate(backup_dates))):
+                if date[:datetime_len] == now:
+                    if i not in to_save:
+                        to_save += [i] 
+                        break
+            datetime_len -= 1 
+            now = now[:datetime_len]
+
+        # remove redundant backup files 
+        j = 0
+        for i in reversed(to_save):
+            if i != j:
+                source = f'{bak_prefix}{i}'
+                target = f'{bak_prefix}{j}'
+                shutil.move(source, target)
+            else:
+                print("keeping", i)
+            j += 1
+        for i in range(j, len(backup_dates)):
+            print("removing", i)
+            try:
+                os.remove(f'{bak_prefix}{i}')
+            except FileNotFoundError:
+                pass
+
+        # 
+        shutil.copy(self.db_file, f'{bak_prefix}{j}')
+        with open(self.db_file, mode) as f:
             f.write(text);
         os.remove(self.lock_file)
 
+    def replace(self, start, end, lines):
+        total_lines = self.real_lines[:start] + lines + self.real_lines[end:]
+        text = '\n'.join(total_lines)
+        self.write_db(text)
+
     def append(self, lines):
-        import shutil
-        if os.path.exists(self.lock_file):
-            raise HandledException('Sorry, lock file!')
-        if os.path.exists(self.db_file):
-            shutil.copy(self.db_file, self.db_file + ".bak")
-        f = open(self.lock_file, 'w+')
-        f.close()
-        with open(self.db_file, 'a') as f:
-            f.write('\n\n' + '\n'.join(lines) + '\n\n');
-        os.remove(self.lock_file)
+        text = '\n\n' + '\n'.join(lines) + '\n\n'
+        self.write_db(text, 'a')
 
     def add_taxes(self, lines, finish=False):
         ret = []
@@ -318,6 +363,7 @@ class Database:
         buffer_expenses = 0
         kk_expenses = 0
         est_expenses = 0
+        months_passed = -int(finish) 
         for b in self.bookings:
             if date == b.date_string:
                 break
@@ -330,11 +376,13 @@ class Database:
                 kk_expenses += b.account_changes[acc_kk]['€']
             if acc_est in acc_keys:
                 est_expenses += b.account_changes[acc_est]['€']
-            if finish and acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
-                last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
-                last_monthbreak_est = b.account_changes[acc_est]['€']
-                last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
-                last_monthbreak_assets = b.account_changes[acc_buffer]['€']
+            if acc_kk_add in acc_keys and acc_kk_minimum in acc_keys:
+                months_passed += 1
+                if finish:
+                    last_monthbreak_kk_add = b.account_changes[acc_kk_add]['€']
+                    last_monthbreak_est = b.account_changes[acc_est]['€']
+                    last_monthbreak_kk_minimum = b.account_changes[acc_kk_minimum]['€']
+                    last_monthbreak_assets = b.account_changes[acc_buffer]['€']
         old_needed_income = last_monthbreak_assets + last_monthbreak_kk_add + last_monthbreak_kk_minimum + last_monthbreak_est
         if finish:
             ret += [f'  {acc_est}  {-last_monthbreak_est}€ ; for old assumption of needed income: {old_needed_income}€']
@@ -349,7 +397,6 @@ class Database:
         E1 = decimal.Decimal(15999)
         E2 = decimal.Decimal(62809)
         E3 = decimal.Decimal(277825)
-        months_passed = int(date[5:7]) - 1
         while True:
             zvE = buffer_expenses - kk_expenses + (12 - months_passed) * needed_income_before_kk
             if finish:
@@ -401,7 +448,8 @@ class Database:
         final_minus = expenses_so_far + old_needed_income + diff
         ret += [f'  {acc_assets}  {-diff} €']
         ret += [f'  {acc_assets}  {final_minus} €']
-        ret += [f'  {acc_buffer}  {-final_minus} €']
+        year_needed = buffer_expenses + final_minus + (12 - months_passed - 1) * final_minus 
+        ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {-year_needed}']
         return ret
 
 
@@ -447,50 +495,61 @@ input[type=number] { text-align: right; font-family: monospace; }
     footer = "</body>\n<html>"
 
     def do_POST(self):
-        db = Database()
-        length = int(self.headers['content-length'])
-        postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
-        parsed_url = urlparse(self.path)
-        lines = []
-        add_empty_line = None
-        start = int(postvars['start'][0])
-        end = int(postvars['end'][0])
-        if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
-            date = postvars['date'][0]
-            description = postvars['description'][0]
-            start_comment = postvars['line_0_comment'][0]
-            lines = [f'{date} {description} ; {start_comment}']
-            if 'line_0_add' in postvars.keys():
-                add_empty_line = 0
-            i = j = 1
-            while f'line_{i}_comment' in postvars.keys():
-                if f'line_{i}_delete' in postvars.keys():
-                    i += 1
-                    continue
-                elif f'line_{i}_delete_after' in postvars.keys():
-                    break 
-                elif f'line_{i}_add' in postvars.keys():
-                    add_empty_line = j
-                account = postvars[f'line_{i}_account'][0]
-                amount = postvars[f'line_{i}_amount'][0]
-                currency = postvars[f'line_{i}_currency'][0]
-                comment = postvars[f'line_{i}_comment'][0]
-                i += 1
-                new_main = f'{account} {amount} {currency}'
-                if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines
-                    continue
-                j += 1
-                new_line = new_main
-                if comment.rstrip() != '':
-                    new_line += f' ; {comment}'
-                lines += [new_line]
-            if 'add_taxes' in postvars.keys():
-                lines += db.add_taxes(lines, finish=False)
-            elif 'add_taxes2' in postvars.keys():
-                lines += db.add_taxes(lines, finish=True)
-        elif '/add_free' == parsed_url.path:
-            lines = postvars['booking'][0].splitlines()
         try:
+            db = Database()
+            length = int(self.headers['content-length'])
+            postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
+            parsed_url = urlparse(self.path)
+            lines = []
+            add_empty_line = None
+            start = int(postvars['start'][0])
+            end = int(postvars['end'][0])
+            if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
+                date = postvars['date'][0]
+                description = postvars['description'][0]
+                start_comment = postvars['line_0_comment'][0]
+                lines = [f'{date} {description} ; {start_comment}']
+                if 'line_0_add' in postvars.keys():
+                    add_empty_line = 0
+                i = j = 1
+                while f'line_{i}_comment' in postvars.keys():
+                    if f'line_{i}_delete' in postvars.keys():
+                        i += 1
+                        continue
+                    elif f'line_{i}_delete_after' in postvars.keys():
+                        break 
+                    elif f'line_{i}_add' in postvars.keys():
+                        add_empty_line = j
+                    account = postvars[f'line_{i}_account'][0]
+                    amount = postvars[f'line_{i}_amount'][0]
+                    currency = postvars[f'line_{i}_currency'][0]
+                    comment = postvars[f'line_{i}_comment'][0]
+                    i += 1
+                    new_main = f'  {account}  {amount}'
+                    if '' == new_main.rstrip() == comment.rstrip():  # don't write empty lines, ignore currency if nothing else set
+                        continue
+                    if len(amount.rstrip()) > 0:
+                        new_main += f' {currency}'
+                    j += 1
+                    new_line = new_main
+                    if comment.rstrip() != '':
+                        new_line += f'  ; {comment}'
+                    lines += [new_line]
+                if 'add_sink' in postvars.keys():
+                    temp_lines = lines.copy() + ['_']
+                    try:
+                        temp_bookings, _ = parse_lines(temp_lines)
+                        for currency in temp_bookings[0].sink:
+                            amount = temp_bookings[0].sink[currency]
+                            lines += [f'Assets  {amount:.2f} {currency}']
+                    except HandledException:
+                        pass
+                if 'add_taxes' in postvars.keys():
+                    lines += db.add_taxes(lines, finish=False)
+                elif 'add_taxes2' in postvars.keys():
+                    lines += db.add_taxes(lines, finish=True)
+            elif '/add_free' == parsed_url.path:
+                lines = postvars['booking'][0].splitlines()
             if ('save' in postvars.keys()) or ('check' in postvars.keys()):
                 _, _ = parse_lines(lines)
             if 'save' in postvars.keys():
@@ -582,7 +641,7 @@ input[type=number] { text-align: right; font-family: monospace; }
         content = "\n".join(lines)
         return f"<pre>{content}</pre>"
 
-    def ledger_as_html(self, db):
+    def ledger2_as_html(self, db):
         elements_to_write = []
         account_sums = {}  ##
         nth_of_same_date = 0
@@ -639,7 +698,7 @@ input[type=number] { text-align: right; font-family: monospace; }
                 booking_lines = booking_lines)]
         return '\n'.join(elements_to_write)
 
-    def ledger2_as_html(self, db):
+    def ledger_as_html(self, db):
         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')
         elements_to_write = []
         last_i = i = 0  ##
@@ -701,6 +760,7 @@ input[type=number] { text-align: right; font-family: monospace; }
 <input type="submit" name="revert" value="revert" />
 <input type="submit" name="add_taxes" value="add taxes" />
 <input type="submit" name="add_taxes2" value="add taxes2" />
+<input type="submit" name="add_sink" value="add sink" />
 <br />
 <input name="date" value="{{date|e}}" size=9 />
 <input name="description" value="{{desc|e}}" list="descriptions" />
@@ -729,7 +789,6 @@ input[type=number] { text-align: right; font-family: monospace; }
 <input type="submit" name="save" value="save!">
 </form>
 """)
-        import datetime
         lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
         bookings, comments = parse_lines(lines, validate_bookings=False)
         if len(bookings) > 1:
@@ -754,7 +813,7 @@ input[type=number] { text-align: right; font-family: monospace; }
         desc = head_comment = ''
         if len(bookings) == 0:
             for i in range(1, 3):
-                booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '', 'comment': ''}]
+                booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
             date=today
         else:
             booking = bookings[0]
@@ -772,7 +831,7 @@ input[type=number] { text-align: right; font-family: monospace; }
                         'i': i,
                         'acc': account,
                         'amt': amount,
-                        'curr': currency if currency else '',
+                        'curr': currency if currency else '€',
                         'comment': comments[i],
                         'comm_cols': len(comments[i])}]
         content += tmpl.render(