On Mon, Jun 2, 2014 at 8:55 PM, Martin Blais bl...@furius.ca wrote:
Why don't you build a tool for printing out the result of these rule-based
modifications? Do you think that would be useful? Is it possible? I see a
lot of questions like: Why doesn't my rule such and such work? I see
unexpected results in the register. If Ledger had a command to expand
everything, and print the expanded results, all of these questions would
be easily answered by inspecting what it's doing, no? Is that easy to
implement?
Just an idea. I'm building something exactly like that for Beancount, to
help in debugging plugins, which are essentially functions that transform a
list of entries in arbitrary ways, into a new, modified list of entries.
One should be able to diff the files and round-trip between data-structure
to text and back.
Actually, I just completed support for round-trips tonight (I had been
writing comparison code lately in order to make it easier to write tests by
writing a list of expected transactions in the input syntax itself, so it
was a-propos). This means that Beancount can now read a complete ledger
file, spit it back out in text, and re-reading that output generates the
same data structures in memory. Writing that re-read structure out again to
a second file also shows no file diff against the first output to text,
it's identical. I tested this on my gigantic personal ledger of 8 years,
and it passes clean.
I'll add a new report type called print shortly, which will just spit out
the data structure it read in memory back to text, after running all the
transformations (e.g. automatically setting the amounts on postings,
processing the tag directives, adding price entries for postings at a
price, and whatever else the plugins do). This should be a nice debugging
tool in the future, as it reflects what it does, e.g., what was
automatically generated by the syntax shortcuts.
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