Bulk convert CommBank statements to CSV

Here's the shape of a CommBank description that trips up most PDF converters: "TRANSFER TO MR J SMITH NETBANK ADELAIDE SA AU" often wraps onto a second line in the PDF that's really still part of the same transaction. A plain text extractor reads that wrapped line as its own row, and a batch job of twelve statements ends up with a hundred phantom half-transactions mixed in among the real ones that then need finding and deleting by hand.

That's the specific problem this parser was built to avoid, since it's a CommBank-shaped one rather than a general PDF issue. Wrapped description lines get joined back to the transaction they belong to, and opening, running and closing balances are tracked through the statement so the numbers stay internally consistent from page to page.

The batch mechanics are the same as any other bank here: ten PDFs per run, Commonwealth Bank set as the file type, and the output is one merged CSV with every transaction from every file in date order rather than a stack of separate spreadsheets to reassemble. Two runs covers a calendar year of NetBank, Smart Access or a CommBank credit card statement on its own or mixed together.

A file uploaded under the wrong bank setting comes back as a clearly labelled failure rather than a CSV that looks fine and quietly isn't, and it costs nothing when that happens. CommSec Trading statements convert through the same process, and a batch isn't limited to one bank, so CommBank and Westpac or ANZ statements can go through side by side.