[GNC-dev] Extending GnuCash: CSV-import/lookup commodity by cusip

[Thomas]

Dear list,

recently, I spotted a feature that I would love to have added to 
GnuCash. As I have a software development background, I could definitely 
contribute to the solution, but as it is quite some time ago that I 
developed in C++ and am new to contributing to GnuCash, I might need 
some cues.

Desired feature:
When importing prices from a CSV file, the matching to existing 
commodities seems to be possible only based on the symbol. What would be 
really helpful for me would be, if this matching could also be done by 
cusip.

The optimal scenario would be the possiblity to choose either "symbol" 
or "cusip" in the dropdown list above the columns and then use another 
method that retrieves the respective commodity as done in 
gnucash/import-export/csv-imp/gnc-imp-props-price.cpp:106 using the 
symbol_str.

 From the functional point of view, I am currently only lacking an idea 
on how such a lookup based on the cusip would look like, as there seems 
only to be a 'gnc_commodity_table_lookup' function that only takes 
namespace and symbol. Would a respective method also need to be 
implemented or what would be the proper approach for looking up a 
commodity by cusip?

Thanks a lot in advance and would be grateful for any hint in this regard!

Best regards,
Thomas