adding viseca importer

docs/importers.rst

@@ -324,3 +324,15 @@ Import CSV from `Neon <https://www.neon-free.ch/>`__
   from tariochbctools.importers.neon import importer as neonimp
 
   CONFIG = [neonimp.Importer("\d\d\d\d_account_statements\.csv", "Assets:Neon:CHF")]
+
+
+Viseca One
+----------
+
+Import PDF from `Viseca One <https://one-digitalservice.ch/>`__
+
+.. code-block:: python
+
+  from tariochbctools.importers.viseca import importer as visecaimp
+
+  CONFIG = [visecaimp.Importer(r"Kontoauszug.*\.pdf", "Assets:Viseca:CHF")]

src/tariochbctools/importers/viseca/importer.py

@@ -0,0 +1,95 @@
+import re
+from datetime import datetime
+
+import camelot
+from beancount.core import amount, data
+from beancount.core.number import D
+from beancount.ingest import importer
+from beancount.ingest.importers.mixins import identifier
+
+
+class Importer(identifier.IdentifyMixin, importer.ImporterProtocol):
+    """An importer for Viseca One Card Statement PDF files."""
+
+    def __init__(self, regexps, account):
+        identifier.IdentifyMixin.__init__(self, matchers=[("filename", regexps)])
+        self.account = account
+        self.currency = "CHF"
+
+    def file_account(self, file):
+        return self.account
+
+    def createEntry(self, file, date, amt, text):
+        meta = data.new_metadata(file.name, 0)
+        return data.Transaction(
+            meta,
+            date,
+            "*",
+            "",
+            text,
+            data.EMPTY_SET,
+            data.EMPTY_SET,
+            [
+                data.Posting(self.account, amt, None, None, None, None),
+            ],
+        )
+
+    def extract(self, file, existing_entries):
+        entries = []
+
+        p = re.compile(
+            r"^(?P<bookingDate>\d\d\.\d\d\.\d\d) (?P<valueDate>\d\d\.\d\d\.\d\d) (?P<detail>.*)$"
+        )
+
+        tables = camelot.read_pdf(
+            file.name, flavor="stream", table_areas=["65,450,575,100"]
+        )
+        for table in tables:
+            df = table.df
+
+            # skip incompatible tables
+            if df.columns.size != 4:
+                continue
+
+            lastTrxDate = None
+            lastAmount = None
+            lastDetails = ""
+            for _, row in df.iterrows():
+                dateValutaDetails, currency, amountCcy, amountChf = tuple(row)
+
+                if (
+                    "XX XXXX" in dateValutaDetails
+                    or "Kartenlimite" in dateValutaDetails
+                ):
+                    continue
+
+                trxDate = None
+                detail = ""
+                m = p.match(dateValutaDetails)
+                if m:
+                    trxDate = m.group("valueDate")
+                    detail = m.group("detail").strip() + " "
+                else:
+                    detail = dateValutaDetails.strip() + " "
+
+                if amountChf:
+                    if lastTrxDate:
+                        amt = None
+                        if "-" in lastAmount:
+                            amt = -amount.Amount(D(lastAmount.strip(" -")), "CHF")
+                        else:
+                            amt = amount.Amount(D(lastAmount), "CHF")
+
+                        book_date = datetime.strptime(lastTrxDate, "%d.%m.%y").date()
+
+                        entries.append(
+                            self.createEntry(file, book_date, amt, lastDetails.strip())
+                        )
+
+                    lastTrxDate = trxDate
+                    lastAmount = amountChf
+                    lastDetails = ""
+
+                lastDetails += detail + " "
+
+        return entries