Commit Graph

5 Commits

Author SHA1 Message Date
jordi fita mas 039bf3abbd Add the “menu” to change invoice statuses 2023-03-07 11:52:09 +01:00
jordi fita mas 4d2379555e Convert invoices to PDF with WeasyPrint
Although it is possible to just print the invoice from the browser, many
people will not even try an assume that they can not create a PDF for
the invoice.

I thought of using Groff or TeX to create the PDF, but it would mean
maintaining two templates in two different systems (HTML and whatever i
would use), and would probably look very different, because i do not
know Groff or TeX that well.

I wish there was a way to tell the browser to print to PDF, and it can
be done, but only with the Chrome Protocol to a server-side running
Chrome instance.   This works, but i would need a Chrome running as a
daemon.

I also wrote a Qt application that uses QWebEngine to print the PDF,
much like wkhtmltopdf, but with support for more recent HTML and CSS
standards.  Unfortunately, Qt 6.4’s embedded Chromium does not follow
break-page-inside as well as WeasyPrint does.

To use WeasyPrint, at first i wanted to reach the same URL as the user,
passing the cookie to WeasyPrint so that i can access the same invoice
as the user, something that can be done with wkhtmltopdf, but WeasyPrint
does not have such option.  I did it with a custom Python script, but
then i need to package and install that script, that is not that much
work, but using the Debian-provided script is even less work, and less
likely to drift when WeasyPrint changes API.

Also, it is unnecessary to do a network round-trip from Go to Python
back to Go, because i can already write the invoice HTML as is to
WeasyPrint’s stdin.
2023-02-26 17:26:09 +01:00
jordi fita mas 97ef02b0f9 Add views to compute taxes and total amount of invoices
They are not functions because i need to join them with the main
invoice relation, and although possible is a bit more awkward with
functions.

The taxes have their own relation because i will need them grouped by
their name in the PDF, so it will probably be a select for that
relation.
2023-02-22 14:39:38 +01:00
jordi fita mas 4903c8a3b9 Add the form to add products to an invoice and create invoices too
Still missing: the invoice number, that requires more tables and
possibly a PL/pgSQL function to do it properly.
2023-02-12 21:06:48 +01:00
jordi fita mas 5c15b9de20 Add the bare-bones form for invoices 2023-02-11 22:16:48 +01:00