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nichtich / wdq

Command line interface to Wikidata Query Service
https://metacpan.org/pod/distribution/App-wdq/script/wdq
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wdq lookup reference error #14

Closed maxlath closed 8 years ago

maxlath commented 8 years ago

after following the apt-get/wget installation instructions, I tried the following command echo http://de.wikipedia.org/wiki/Argon | wdq lookup (pasted from your tweet) which returned the following error: Can't call method "referenced_variables" on an undefined value at /usr/share/perl5/RDF/Query/Algebra/Service.pm line 255, <> line 1.

Other commands such as wdq -q '?c wdt:P361 wd:Q544' seem to work just fine. Could this be that the master branch doesn't provide this functionality yet?

nichtich commented 8 years ago

Thanks for the bug report! Unfortunately I cannot reproduce error, at least on a fresh Ubuntu 14.04. Which operating system do you use? Could you also tell what version of the packages you have installed?

$ perl -E 'use RDF::Query; say $RDF::Query::VERSION'

Further investigation requires a stack trace to show where the error originated from:

$ sudo apt-get install libcarp-always-perl
$ echo http://de.wikipedia.org/wiki/Argon | perl -MCarp::Always `which wdq` lookup
maxlath commented 8 years ago

Ubuntu: 12.04.5 LTS (yes, I'm waaay too late on updates) libhttp-tiny-perl: 0.016-1 librdf-query-perl: 2.908-1

$ perl -E 'use RDF::Query; say $RDF::Query::VERSION'

Name "_p_librdf_world_s::OWNER" used only once: possible typo at /usr/share/perl5/RDF/Redland.pm line 49.
2.908

$ echo http://de.wikipedia.org/wiki/Argon | perl -MCarp::Alwayswhich wdqlookup

Can't call method "referenced_variables" on an undefined value at /usr/share/perl5/RDF/Query/Algebra/Service.pm line 255
    RDF::Query::Algebra::Service::referenced_variables('RDF::Query::Algebra::Service=ARRAY(0x62c1838)') called at /usr/share/perl5/RDF/Query/Algebra/GroupGraphPattern.pm line 255
    RDF::Query::Algebra::GroupGraphPattern::referenced_variables('RDF::Query::Algebra::GroupGraphPattern=ARRAY(0x62c11a8)') called at /usr/share/perl5/RDF/Query/Algebra/Project.pm line 343
    RDF::Query::Algebra::Project::referenced_variables('RDF::Query::Algebra::Project=ARRAY(0x62cc938)') called at /usr/share/perl5/RDF/Query.pm line 746
    RDF::Query::as_sparql('RDF::Query=HASH(0x62e3ef8)') called at /home/maxlath/scripts/wdq line 501
nichtich commented 8 years ago

I could not easily find the problem and planned to only support what's available at least in Ubuntu 14.04 LTS anyway, so I'm sorry for not fixing this bug.