As a WMCS user when writing a sparql query and when I start entering the sdc: prefix I'd like to have the same autocompletion feature currently available on wikidata items.
AC:
Given that mediainfo items are just of the form sdc:M12345, is much meaningful autocompletion for these actually possible?
(Autocompletion for Commons filenames might be a nice touch, though I doubt these would often be specified as literals in queries, as the M-IDs are so much shorter).
The same meaningful autocompletion as for Wikidata items, which are of the form wd:Q12345? ^^
In other words, you start typing sdc:Yuzuru Hanyu 20 and it suggests Yuzuru Hanyu 2009 JGPF Podium.jpg, Yuzuru Hanyu 2010 Cup of Russia.JPG and Yuzuru hanyu 2015 worlds.jpg, and when you select the third file it replaces the input with sdc:M43058490.
I can't find in wikibase/queryService/ui/editor/Editor.js (and "sub-classes") what to change in order to allow autocompletion for sdc:. From what I understand, adding
PREFIX sdc: <http://commons.wikimedia.org/entity/>
to the query should make the autocompletion work (as per hint/Rdf.js which seems to handle all the RDF namespaces). But it does not.
Or maybe that's a config thing?
The current search is implemented in wikibase/queryService/ui/editor/hint/Rdf.js, based on wikibase/queryService/api/Wikibase.js, which uses the wbsearchentities API. That API is useless on Commons, so someone™ will have to implement an alternative search for files – perhaps just using the regular search, limited to the file namespace. It might need a new group of namespaces in RdfNamespaces.js too (in addition to ENTITY_TYPES), so the UI knows when to search for items and when to search for files.