In this directory one may find my invoicing tools. These handle line-item math and generate pretty PDFs. I place line-items into items.txt, which holds tab-seperated values for each line's information (date, description, quantity, unit, and price). Then, I run `gen.sh` to create a PDF. It goes through each item, generates placeholder LaTeX syntax, and inserts the placeholders into the invoice.tex template. The template is compiled, producing a PDF with the invoice's ID being the name of the directory it is held under. In this example, the invoice's ID is '2020-000'. Finally, after I inspect the invoice, I toss it onto my reMarkable tablet to sign, then download it back to my computer. The signed invoice is placed into a "Pending Payments" folder, and I email a copy to the customer.