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Improve todo accounting.
[misc] / ledger.py
index 244a68444c6d60901330cd3df6ff637be24553f6..9ff0d3eaabc723170071ffbb0e3a4726a6a747d0 100755 (executable)
--- a/ledger.py
+++ b/ledger.py
@@ -3,7 +3,7 @@ import jinja2
 import decimal
 from datetime import datetime, timedelta
 from urllib.parse import parse_qs, urlparse
-from plomlib import PlomDB, PlomException, run_server, run_server, PlomServer
+from plomlib import PlomDB, PlomException, run_server, PlomHandler 
 
 server_port = 8082
 db_path = '/home/plom/org/ledger2023.dat'
@@ -20,20 +20,20 @@ input[type=number] { text-align: right; font-family: monospace; }
 .full_line_comment { display: block; white-space: nowrap; width: 0; }
 </style>
 <body>
-<a href="/">ledger</a>
-<a href="/balance">balance</a>
-<a href="/add_free">add free</a>
-<a href="/add_structured">add structured</a>
+<a href="{{prefix}}/ledger">ledger</a>
+<a href="{{prefix}}/balance">balance</a>
+<a href="{{prefix}}/add_free">add free</a>
+<a href="{{prefix}}/add_structured">add structured</a>
 <hr />
 """
 booking_html = """
-<p id="{{nth}}"><a href="#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
-<span class="meta">[edit: <a href="/add_structured?start={{start}}&end={{end}}">structured</a>
-/ <a href="/add_free?start={{start}}&end={{end}}">free</a>
-| copy:<a href="/copy_structured?start={{start}}&end={{end}}">structured</a>
-/ <a href="/copy_free?start={{start}}&end={{end}}">free</a>
-| 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 %}
-| <a href="/balance?stop={{nth+1}}">balance after</a>
+<p id="{{nth}}"><a href="{{prefix}}#{{nth}}">{{date}}</a> {{desc}} <span class="comment">{{head_comment|e}}</span><br />
+<span class="meta">[edit: <a href="{{prefix}}/add_structured?start={{start}}&end={{end}}">structured</a>
+/ <a href="{{prefix}}/add_free?start={{start}}&end={{end}}">free</a>
+| copy:<a href="{{prefix}}/copy_structured?start={{start}}&end={{end}}">structured</a>
+/ <a href="{{prefix}}/copy_free?start={{start}}&end={{end}}">free</a>
+| move {% if move_up %}<a href="{{prefix}}/move_up?start={{start}}&end={{end}}">up</a>{% else %}up{% endif %}/{% if move_down %}<a href="{{prefix}}/move_down?start={{start}}&end={{end}}">down</a>{% else %}down{% endif %}
+| <a href="{{prefix}}/balance?stop={{nth+1}}">balance after</a>
 ]</span>
 <table>
 {% for l in booking_lines %}
@@ -65,6 +65,10 @@ add_structured_html = """
 <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" />
+<input name="replace_from" />
+<input type="submit" name="replace" value="-> replace ->" />
+<input name="replace_to" />
+<input type="submit" name="add_mirror" value="add mirror" />
 <br />
 <input name="date" value="{{date|e}}" size=9 />
 <input name="description" value="{{desc|e}}" list="descriptions" />
@@ -333,7 +337,8 @@ class Booking:
 
 class LedgerDB(PlomDB):
 
-    def __init__(self):
+    def __init__(self, prefix):
+        self.prefix = prefix 
         self.bookings = []
         self.comments = []
         self.real_lines = []
@@ -349,21 +354,28 @@ class LedgerDB(PlomDB):
         return self.real_lines[start:end]
 
     def write_db(self, text, mode='w'):
+        if text[-1] != '\n':
+            text += '\n'
         self.write_text_to_db(text)
 
     def insert_at_date(self, lines, date):
-        start_at = len(self.real_lines)
-        for b in self.bookings:
-            if b.date_string == date:
-                start_at = b.start_line 
-                break
-            elif b.date_string > date:
-                break
-        if start_at == len(self.real_lines):
-            lines = [''] + lines
+        print("DEBUG insert_at_date")
+        start_at = 0 
+        if len(self.bookings) > 0:
+            if date >= self.bookings[-1].date_string:
+                start_at = len(self.real_lines)
+                lines = [''] + lines
+            else:
+                for b in self.bookings:
+                    if b.date_string == date:
+                        start_at = b.start_line 
+                    elif b.date_string > date:
+                        start_at = b.start_line 
+                        break
         return self.write_lines_in_total_lines_at(self.real_lines, start_at, lines)
 
     def update(self, start, end, lines, date):
+        print("DEBUG update")
         total_lines = self.real_lines[:start] + self.real_lines[end:]
         n_original_lines = end - start
         start_at = len(total_lines)
@@ -512,184 +524,29 @@ class LedgerDB(PlomDB):
             ret += [f'  {acc_buffer}  {-final_minus} € ; assume as to earn in year: {acc_buffer} + {12 - months_passed - 1} * this = {year_needed}']
         return ret
 
+    def add_mirror(self, lines):
+        ret = []
+        bookings, _ = parse_lines(lines)
+        booking = bookings[0]
+        for line in booking.lines[1:]:
+            ret += [f'?  {-line[1]} {line[2]}']
+        return ret
 
-class LedgerServer(PlomServer):
-
-    def pre_init(self):
-        self.html_head += [html_head]
-
-    def do_POST(self):
-        try:
-            parsed_url = urlparse(self.path)
-            length = int(self.headers['content-length'])
-            postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
-            start = int(postvars['start'][0])
-            end = int(postvars['end'][0])
-            db = LedgerDB()
-            add_empty_line = None
-            lines = []
-            # get inputs
-            if '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
-                lines, add_empty_line = self.booking_lines_from_postvars(postvars, db) 
-            elif '/add_free' == parsed_url.path and not 'revert' in postvars.keys():
-                lines = postvars['booking'][0].splitlines()
-            # validate where appropriate
-            if ('save' in postvars.keys()) or ('check' in postvars.keys()):
-                _, _ = parse_lines(lines)
-            # if saving, process where to and where to redirect after
-            if 'save' in postvars.keys():
-                last_date = str(datetime.now())[:10]
-                if len(db.bookings) > 0:
-                    last_date = db.bookings[-1].date_string
-                target_date = last_date[:] 
-                first_line_tokens = lines[0].split() if len(lines) > 0 else ''
-                first_token = first_line_tokens[0] if len(first_line_tokens) > 0 else ''
-                try:
-                    datetime.strptime(first_token, '%Y-%m-%d')
-                    target_date = first_token
-                except ValueError:
-                     pass
-                if start == end == 0:
-                    start = db.insert_at_date(lines, target_date)
-                    nth = db.get_nth_for_booking_of_start_line(start) 
-                else:
-                    new_start = db.update(start, end, lines, target_date)
-                    nth = db.get_nth_for_booking_of_start_line(new_start)
-                    if new_start > start: 
-                        nth -= 1 
-                self.redirect( f'/#{nth}')
-            # otherwise just re-build editing form
-            else:
-                if '/add_structured' == parsed_url.path: 
-                    edit_content = self.add_structured(db, start, end, temp_lines=lines, add_empty_line=add_empty_line)
-                else:
-                    edit_content = self.add_free(db, start, end)
-                self.send_HTML(edit_content)
-        except PlomException as e:
-            self.fail_400(e)
-
-    def do_GET(self):
-        try:
-            parsed_url = urlparse(self.path)
-            params = parse_qs(parsed_url.query)
-            start = int(params.get('start', ['0'])[0])
-            end = int(params.get('end', ['0'])[0])
-            db = LedgerDB()
-            if parsed_url.path == '/balance':
-                stop = params.get('stop', [None])[0]
-                page = self.balance_as_html(db, stop)
-            elif parsed_url.path == '/add_free':
-                page = self.add_free(db, start, end)
-            elif parsed_url.path == '/add_structured':
-                page = self.add_structured(db, start, end)
-            elif parsed_url.path == '/copy_free':
-                page = self.add_free(db, start, end, copy=True)
-            elif parsed_url.path == '/copy_structured':
-                page = self.add_structured(db, start, end, copy=True)
-            elif parsed_url.path == '/move_up':
-                nth = self.move_up(db, start, end)
-                self.redirect(f'/#{nth}')
-                return
-            elif parsed_url.path == '/move_down':
-                nth = self.move_down(db, start, end)
-                self.redirect(f'/#{nth}')
-                return
-            else:
-                page = self.ledger_as_html(db)
-            self.send_HTML(page)
-        except PlomException as e:
-            self.fail_400(e)
-
-    def booking_lines_from_postvars(self, postvars, db):
-        add_empty_line = None
-        date = postvars['date'][0]
-        description = postvars['description'][0]
-        start_comment = postvars['line_0_comment'][0]
-        start_line = f'{date} {description}'
-        if start_comment.rstrip() != '':
-            start_line += f' ; {start_comment}' 
-        lines = [start_line]
-        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 PlomException:
-                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)
-        return lines, add_empty_line
-
-    def balance_as_html(self, db, until=None):
-        bookings = db.bookings[:until if until is None else int(until)]
-        lines = []
-        account_tree, account_sums = bookings_to_account_tree(bookings)
-        def print_subtree(lines, indent, node, subtree, path):
-            line = f"{indent}{node}"
-            n_tabs = 5 - (len(line) // 8)
-            line += n_tabs * "\t"
-            if "€" in account_sums[path + node].keys():
-                amount = account_sums[path + node]["€"]
-                line += f"{amount:9.2f} €\t"
-            else:
-                line += f"\t\t"
-            for currency, amount in account_sums[path + node].items():
-                if currency != '€' and amount > 0:
-                    line += f"{amount:5.2f} {currency}\t"
-            lines += [line]
-            indent += "  "
-            for k, v in sorted(subtree.items()):
-                print_subtree(lines, indent, k, v, path + node + ":")
-        for k, v in sorted(account_tree.items()):
-            print_subtree(lines, "", k, v, "")
-        content = "\n".join(lines)
-        return f"<pre>{content}</pre>"
-
-    def ledger_as_html(self, db):
+    def ledger_as_html(self):
         booking_tmpl = jinja2.Template(booking_html)
         single_c_tmpl = jinja2.Template('<span class="comment">{{c|e}}</span><br />')  ##
         elements_to_write = []
         last_i = i = 0  ##
-        for nth, booking in enumerate(db.bookings):
-            move_up = nth > 0 and db.bookings[nth - 1].date_string == booking.date_string
-            move_down = nth < len(db.bookings) - 1 and db.bookings[nth + 1].date_string == booking.date_string
+        for nth, booking in enumerate(self.bookings):
+            move_up = nth > 0 and self.bookings[nth - 1].date_string == booking.date_string
+            move_down = nth < len(self.bookings) - 1 and self.bookings[nth + 1].date_string == booking.date_string
             booking_end = last_i = booking.start_line + len(booking.lines)
             booking_lines = []
             i = booking.start_line  ##
-            elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:i] if c != '']  ##
+            elements_to_write += [single_c_tmpl.render(c=c) for c in self.comments[last_i:i] if c != '']  ##
             for booking_line in booking.lines[1:]:
                  i += 1  ##
-                 comment = db.comments[i]  ##
+                 comment = self.comments[i]  ##
                  if booking_line == '':
                      booking_lines += [{'acc': None, 'money': None, 'comment': comment}]  ##
                      continue
@@ -699,28 +556,54 @@ class LedgerServer(PlomServer):
                      money = f'{booking_line[1]} {booking_line[2]}'
                  booking_lines += [{'acc': booking_line[0], 'money':money, 'comment':comment}]  ##
             elements_to_write += [booking_tmpl.render(
+                prefix=self.prefix,
                 nth=nth,
                 start=booking.start_line,
                 end=booking_end,
                 date=booking.date_string,
                 desc=booking.description,
-                head_comment=db.comments[booking.start_line],
+                head_comment=self.comments[booking.start_line],
                 move_up=move_up,
                 move_down=move_down,
                 booking_lines = booking_lines)]
-        elements_to_write += [single_c_tmpl.render(c=c) for c in db.comments[last_i:] if c != '']  #
+        elements_to_write += [single_c_tmpl.render(c=c) for c in self.comments[last_i:] if c != '']  #
         return '\n'.join(elements_to_write)
 
-    def add_free(self, db, start=0, end=0, copy=False):
+    def balance_as_html(self, until=None):
+        bookings = self.bookings[:until if until is None else int(until)]
+        lines = []
+        account_tree, account_sums = bookings_to_account_tree(bookings)
+        def print_subtree(lines, indent, node, subtree, path):
+            line = f"{indent}{node}"
+            n_tabs = 5 - (len(line) // 8)
+            line += n_tabs * "\t"
+            if "€" in account_sums[path + node].keys():
+                amount = account_sums[path + node]["€"]
+                line += f"{amount:9.2f} €\t"
+            else:
+                line += f"\t\t"
+            for currency, amount in account_sums[path + node].items():
+                if currency != '€' and amount > 0:
+                    line += f"{amount:5.2f} {currency}\t"
+            lines += [line]
+            indent += "  "
+            for k, v in sorted(subtree.items()):
+                print_subtree(lines, indent, k, v, path + node + ":")
+        for k, v in sorted(account_tree.items()):
+            print_subtree(lines, "", k, v, "")
+        content = "\n".join(lines)
+        return f"<pre>{content}</pre>"
+
+    def add_free(self, start=0, end=0, copy=False):
         tmpl = jinja2.Template(add_form_header + add_free_html + add_form_footer) 
-        lines = db.get_lines(start, end)
+        lines = self.get_lines(start, end)
         if copy:
             start = end = 0
-        return tmpl.render(action='add_free', start=start, end=end, lines=lines)
+        return tmpl.render(action=self.prefix + '/add_free', start=start, end=end, lines=lines)
 
-    def add_structured(self, db, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
+    def add_structured(self, start=0, end=0, copy=False, temp_lines=[], add_empty_line=None):
         tmpl = jinja2.Template(add_form_header + add_structured_html + add_form_footer) 
-        lines = temp_lines if len(''.join(temp_lines)) > 0 else db.get_lines(start, end)
+        lines = temp_lines if len(''.join(temp_lines)) > 0 else self.get_lines(start, end)
         bookings, comments = parse_lines(lines, validate_bookings=False)
         if len(bookings) > 1:
             raise PlomException('can only structurally edit single Booking')
@@ -728,9 +611,9 @@ class LedgerServer(PlomServer):
             comments = comments[:add_empty_line+1] + [''] + comments[add_empty_line+1:]
             booking = bookings[0]
             booking.lines = booking.lines[:add_empty_line+1] + [''] + booking.lines[add_empty_line+1:]
-        action = 'add_structured'
+        action = self.prefix + '/add_structured'
         datalist_sets = {'descriptions': set(), 'accounts': set(), 'currencies': set()}
-        for b in db.bookings:
+        for b in self.bookings:
             datalist_sets['descriptions'].add(b.description)
             for account, moneys in b.account_changes.items():
                 datalist_sets['accounts'].add(account)
@@ -743,15 +626,12 @@ class LedgerServer(PlomServer):
             start = end = 0
         desc = head_comment = ''
         if len(bookings) == 0:
-            for i in range(1, 3):
-                booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
             date=today
         else:
             booking = bookings[0]
             desc = booking.description
             date = today if copy else booking.date_string
             head_comment=comments[0]
-            last_line = len(comments)
             for i in range(1, len(comments)):
                 account = amount = currency = ''
                 if i < len(booking.lines) and booking.lines[i] != '':
@@ -765,6 +645,8 @@ class LedgerServer(PlomServer):
                         'curr': currency if currency else '€',
                         'comment': comments[i],
                         'comm_cols': len(comments[i])}]
+        for i in range(len(comments), len(comments) + 8):
+            booking_lines += [{'i': i, 'acc': '', 'amt': '', 'curr': '€', 'comment': ''}]
         content += tmpl.render(
                 action=action,
                 date=date,
@@ -776,31 +658,183 @@ class LedgerServer(PlomServer):
                 end=end)
         return content
 
-    def move_up(self, db, start, end):
+    def move_up(self, start, end):
         prev_booking = None
-        for redir_nth, b in enumerate(db.bookings):
+        for redir_nth, b in enumerate(self.bookings):
             if b.start_line >= start:
                 break
             prev_booking = b
         start_at = prev_booking.start_line 
-        self.make_move(db, start, end, start_at)
+        self.make_move(start, end, start_at)
         return redir_nth - 1
 
-    def move_down(self, db, start, end):
+    def move_down(self, start, end):
         next_booking = None
-        for redir_nth, b in enumerate(db.bookings):
+        for redir_nth, b in enumerate(self.bookings):
             if b.start_line > start:
                 next_booking = b
                 break
         start_at = next_booking.start_line + len(next_booking.lines) - (end - start) + 1 
-        self.make_move(db, start, end, start_at)
+        self.make_move(start, end, start_at-1)
         return redir_nth
 
-    def make_move(self, db, start, end, start_at):
-        lines = db.get_lines(start, end)
-        total_lines = db.real_lines[:start] + db.real_lines[end:]
-        db.write_lines_in_total_lines_at(total_lines, start_at, lines)
+    def make_move(self, start, end, start_at):
+        lines = self.get_lines(start, end)
+        total_lines = self.real_lines[:start-1] + self.real_lines[end:]  # +1 because we reduce the original position's two empty border lines to in-between line
+        self.write_lines_in_total_lines_at(total_lines, start_at, lines)
+
+    def booking_lines_from_postvars(self, postvars):
+        add_empty_line = None
+        date = postvars['date'][0]
+        description = postvars['description'][0]
+        start_comment = postvars['line_0_comment'][0]
+        start_line = f'{date} {description}'
+        if start_comment.rstrip() != '':
+            start_line += f' ; {start_comment}' 
+        lines = [start_line]
+        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 PlomException:
+                pass
+        elif 'add_taxes' in postvars.keys():
+            lines += self.add_taxes(lines, finish=False)
+        elif 'add_taxes2' in postvars.keys():
+            lines += self.add_taxes(lines, finish=True)
+        elif 'replace' in postvars.keys():
+            for i, line in enumerate(lines):
+                lines[i] = line.replace(postvars['replace_from'][0], postvars['replace_to'][0])
+        elif 'add_mirror' in postvars.keys():
+            lines += self.add_mirror(lines)
+        return lines, add_empty_line
+
+
+
+class LedgerHandler(PlomHandler):
+    
+    def app_init(self, handler):
+        default_path = '/ledger'
+        handler.add_route('GET', default_path, self.forward_gets) 
+        handler.add_route('POST', default_path, self.forward_posts) 
+        return 'ledger', default_path 
+
+    def do_POST(self):
+        self.try_do(self.forward_posts)
+
+    def forward_posts(self):
+        prefix = self.apps['ledger'] if hasattr(self, 'apps') else '' 
+        parsed_url = urlparse(self.path)
+        length = int(self.headers['content-length'])
+        postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
+        start = int(postvars['start'][0])
+        end = int(postvars['end'][0])
+        db = LedgerDB(prefix)
+        add_empty_line = None
+        lines = []
+        # get inputs
+        if prefix + '/add_structured' == parsed_url.path and not 'revert' in postvars.keys():
+            lines, add_empty_line = db.booking_lines_from_postvars(postvars) 
+        elif prefix + '/add_free' == parsed_url.path and not 'revert' in postvars.keys():
+            lines = postvars['booking'][0].splitlines()
+        # validate where appropriate
+        if ('save' in postvars.keys()) or ('check' in postvars.keys()):
+            _, _ = parse_lines(lines)
+        # if saving, process where to and where to redirect after
+        if 'save' in postvars.keys():
+            last_date = str(datetime.now())[:10]
+            if len(db.bookings) > 0:
+                last_date = db.bookings[-1].date_string
+            target_date = last_date[:] 
+            first_line_tokens = lines[0].split() if len(lines) > 0 else ''
+            first_token = first_line_tokens[0] if len(first_line_tokens) > 0 else ''
+            try:
+                datetime.strptime(first_token, '%Y-%m-%d')
+                target_date = first_token
+            except ValueError:
+                 pass
+            if start == end == 0:
+                start = db.insert_at_date(lines, target_date)
+                nth = db.get_nth_for_booking_of_start_line(start) 
+            else:
+                new_start = db.update(start, end, lines, target_date)
+                nth = db.get_nth_for_booking_of_start_line(new_start)
+                if new_start > start: 
+                    nth -= 1 
+            self.redirect(prefix + f'/#{nth}')
+        # otherwise just re-build editing form
+        else:
+            if prefix + '/add_structured' == parsed_url.path: 
+                edit_content = db.add_structured(start, end, temp_lines=lines, add_empty_line=add_empty_line)
+            else:
+                edit_content = db.add_free(start, end)
+            header = jinja2.Template(html_head).render(prefix=prefix)
+            self.send_HTML(header + edit_content)
+
+    def do_GET(self):
+        self.try_do(self.forward_gets)
+
+    def forward_gets(self):
+        prefix = self.apps['ledger'] if hasattr(self, 'apps') else '' 
+        parsed_url = urlparse(self.path)
+        params = parse_qs(parsed_url.query)
+        start = int(params.get('start', ['0'])[0])
+        end = int(params.get('end', ['0'])[0])
+        db = LedgerDB(prefix=prefix)
+        if parsed_url.path == prefix + '/balance':
+            stop = params.get('stop', [None])[0]
+            page = db.balance_as_html(stop)
+        elif parsed_url.path == prefix + '/add_free':
+            page = db.add_free(start, end)
+        elif parsed_url.path == prefix + '/add_structured':
+            page = db.add_structured(start, end)
+        elif parsed_url.path == prefix + '/copy_free':
+            page = db.add_free(start, end, copy=True)
+        elif parsed_url.path == prefix + '/copy_structured':
+            page = db.add_structured(start, end, copy=True)
+        elif parsed_url.path == prefix + '/move_up':
+            nth = db.move_up(start, end)
+            self.redirect(prefix + f'/#{nth}')
+            return
+        elif parsed_url.path == prefix + '/move_down':
+            nth = db.move_down(start, end)
+            self.redirect(prefix + f'/#{nth}')
+            return
+        else:
+            page = db.ledger_as_html()
+        header = jinja2.Template(html_head).render(prefix=prefix)
+        self.send_HTML(header + page)
+
 
 
 if __name__ == "__main__":  
-    run_server(server_port, LedgerServer)
+    run_server(server_port, LedgerHandler)