:- module(_,[ loaded_kp/1, all_kps_loaded/0, all_kps_loaded/1, kp_dir/1, taxkb_dir/1, kp_location/3, kp/1, must_succeed/2, must_succeed/1, shouldMapModule/2, module_api_hack/1, moduleMapping/2, myDeclaredModule/1, system_predicate/1, discover_kps_in_dir/1, discover_kps_in_dir/0, discover_kps_gitty/0, setup_kp_modules/0, load_kps/0, load_gitty_files/1, load_gitty_files/0, save_gitty_files/1, save_gitty_files/0, delete_gitty_file/1, update_gitty_file/3, xref_all/0, xref_clean/0, print_kp_predicates/0, print_kp_predicates/1, reset_errors/0, my_xref_defined/3, url_simple/2, kp_predicate_mention/3, predicate_literal/2,load_named_file/3, edit_kp/1, swish_editor_path/2, knowledgePagesGraph/1, knowledgePagesGraph/2]). :- use_module(library(prolog_xref)). :- use_module(library(broadcast)). :- multifile prolog:message//1. :- dynamic kp_dir/1, taxkb_dir/1. :- prolog_load_context(directory, D), retractall(taxkb_dir(_)), assert(taxkb_dir(D)), retractall(kp_dir(_)), atomic_list_concat([D,'/kb'], KD), assert(kp_dir(KD)), print_message(informational,"KB directory is ~a"-[KD]). /** Dynamic module loader. Scans a given set of Prolog files in SWISH storage or in a file system directpry, and identifies "knowledge pages", files which: - are modules named with an URL Can also export and import SWISH storage to/from a file system directory. */ :- dynamic kp_location/4. % URL,File,ModifiedTime,InGitty kp_location(URL,File,InGitty) :- kp_location(URL,File,_,InGitty). kp(URL_) :- (nonvar(URL_) -> atom_string(URL,URL_);URL=URL_), kp_location(URL,_,_). %! discover_kps_in_dir(+Dir) is det. % discover_kps_in_dir(Dir) :- retractall(kp_location(_,_,_,false)), forall(directory_member(Dir,File,[extensions([pl])]), ( time_file(File,Modified), open(File,read,In), process_file(In,File,Modified,false) )). % This also RELOADS modules already loaded discover_kps_in_dir :- kp_dir(D), discover_kps_in_dir(D). process_file(In,File,Modified,InGitty) :- must_be(boolean,InGitty), setup_call_cleanup( true, ( process_terms(In, LastTerm), % (LastTerm=at(Name) -> ( (LastTerm=(:-module(Name,_)) -> ( ((kp_location(Name,PreviousFile,PreviousMod,InGitty), PreviousMod>=Modified) -> print_message(warning,ignored_older_module(Name,PreviousFile,File)) ; ( (kp_location(Name,PreviousFile,_,InGitty) -> print_message(warning,using_newer_module(Name,PreviousFile,File)) ; true), retractall(kp_location(Name,_,_,InGitty)), assert(kp_location(Name,File,Modified,InGitty)), % reload the module if it already exists: (current_module(Name) -> load_named_file(File,Name,InGitty) ; true) )) ); true) ), close(In)). prolog:message(ignored_older_module(Module,PreviousFile,File)) --> ['Ignored older file ~a for module ~w; sticking to ~a'-[File,Module,PreviousFile]]. prolog:message(using_newer_module(Module,PreviousFile,File)) --> ['Forgot older file ~a for module ~w; using instead ~a'-[PreviousFile,Module,File]]. process_terms(In,Term) :- % actually gets only the first term, where the module declaration must be: %repeat, read_term(In, Term, [syntax_errors(fail)]), ( Term==end_of_file, ! ; Term= (:- module(URL,_)), is_absolute_url(URL), ! ; true %Term=at(Name), (ground(Name)->true; print_message(warning,'ignored'(at(Name))), fail) ). declare_our_metas(Module) :- Module:meta_predicate(mainGoal(0,+)), Module:meta_predicate(on(0,?)), Module:meta_predicate(because(0,-)). % load_named_file(+File,+Module,+InGittyStorage) load_named_file(File,Module,InGittyStorage) :- load_named_file_(File,Module,InGittyStorage), kp_file_modified(Module,Modified,InGittyStorage), retractall(kp_location(Module,File,_,InGittyStorage)), assert(kp_location(Module,File,Modified,InGittyStorage)), (xref_source(Module,[silent(true)]) -> true ; print_message(warning,"failed xref_source"-[])). load_named_file_(File,Module,true) :- !, %print_message(informational, "load File into Module ~w ~w\n"-[File, Module]), use_gitty_file(Module:File,[/* useless: module(Module)*/]). load_named_file_(File,Module,false) :- load_files(File,[module(Module)]). load_kps :- forall(kp_location(URL,File,InGitty), ( load_named_file(File,URL,InGitty) )). setup_kp_modules :- forall(kp(M), setup_kp_module(M) ). setup_kp_module(M) :- M:discontiguous((if)/2), M:discontiguous((on)/2), M:discontiguous((because)/2), M:discontiguous(question/2), M:discontiguous(question/3), declare_our_metas(M). all_kps_loaded :- all_kps_loaded(_). all_kps_loaded(KP):- print_message(informational,"Loading Knowledge Page(s)..(~w)"-[KP]), forall(kp(KP),loaded_kp(KP)). :- thread_local module_api_hack/1. %! loaded_kp(++KnowledgePageName) is nondet. % % loads the knowledge page, failing if it cannot loaded_kp(Name) :- module_api_hack(Name), !. loaded_kp(Name) :- must_be(nonvar,Name), shouldMapModule(_,Name), !. % SWISH module already loaded loaded_kp(Name) :- \+ kp_location(Name,_,_), !, (\+ reported_missing_kp(Name) -> ( assert(reported_missing_kp(Name)), print_message(error,"Unknown knowledge page: ~w"-[Name])) ; true), fail. loaded_kp(Name) :- % some version already loaded: module_property(Name,last_modified_generation(T)), T>0, !, once(( kp_file_modified(Name,FT,InGitty), kp_location(Name,File,LastModified,InGitty) )), (FT>LastModified -> ( load_named_file(File,Name,InGitty), print_message(informational,"Reloaded ~w"-[Name]) ) ; true). loaded_kp(Name) :- kp_location(Name,File,InGitty), !, % first load: load_named_file(File,Name,InGitty), (\+ reported_loaded_kp(Name) -> ( print_message(informational,loaded(Name,File)), assert(reported_loaded_kp(Name))) ; true). loaded_kp(Name) :- \+ reported_missing_kp(Name), print_message(error,no_kp(Name)), assert(reported_missing_kp(Name)), fail. kp_file_modified(Name,Time,InGitty) :- kp_location(Name,File,InGitty), (InGitty==true -> (storage_meta_data(File, Meta), Time=Meta.time) ; time_file(File,Time)). :-thread_local reported_missing_kp/1. :-thread_local reported_loaded_kp/1. reset_errors :- retractall(reported_missing_kp(_)), retractall(reported_loaded_kp(_)). prolog:message(loaded(Module,Path)) --> ['Loaded ~w from ~a'-[Module,Path]]. % Support xref for gitty and file system files :- multifile prolog:xref_source_identifier/2, prolog:xref_open_source/2, prolog:xref_close_source/2, prolog:xref_source_time/2, prolog:meta_goal/2. prolog:xref_source_identifier(URL, URL) :- kp_location(URL,_,_). prolog:xref_open_source(URL, Stream) :- kp_location(URL,File,InGitty), (InGitty==true -> (storage_file(File,Data,_Meta), open_string(Data, Stream)) ; (open(File,read,Stream))). prolog:xref_close_source(_, Stream) :- close(Stream). prolog:xref_source_time(URL, Modified) :- kp_location(URL,_File,Modified,_InGitty). %! xref_all is det % % refresh xref database for all knowledge pages %TODO: report syntax errors properly xref_all :- forall(kp_location(URL,File,_), ( print_message(informational,xreferencing(URL,File)), xref_source(URL,[silent(true)]) % to avoid spurious warnings for mainGoal singleton vars )). prolog:message(xreferencing(URL,File)) --> ['Xreferencing module ~w in file ~w'-[URL,File]]. prolog:message(no_kp(Name)) --> ["Could not find knowledge page ~w"-[Name]]. xref_clean :- forall(kp_location(URL,_,_), xref_clean(URL)). % kp_predicate_mention(?Module,?PredicateTemplate,?How) How is called_by(KP)/defined % Considers undefined predicates too; ignores mentions from example scenarios kp_predicate_mention(KP,G,How) :- (nonvar(KP) -> true ; kp(KP)), ( xref_defined(KP,G,_), How=defined ; xref_called(KP, Called, _By), (Called=_:G->true;Called=G), How=called_by(KP) ), \+ prolog:meta_goal(G,_), \+ system_predicate(G). %! predicate_argnames(+KP,?PredicateTemplate) is nondet. % Grounds argument variables with their source names AS MUCH AS POSSIBLE, using system meta information from the clauses mentioning the predicate % KP must be already loaded. Anonymous variables are not ground. predicate_literal(M,Pred) :- must_be(nonvar,M), (M:clause(Pred,Body,Ref) ; my_xref_called(M,Pred,By), clause(M:By,Body,Ref), \+ \+ contains_term(Pred,Body)), clause_info(Ref,_,_,_,[variable_names(Names)]), bind_vars_with_names(Pred:-Body,Names). %TODO: should use a contains_term with variant/2 instead %! bind_vars_with_names(?Term,+VarNames) % VarNames is a list of Name=Var bind_vars_with_names(T,VN) :- bind_vars_with_names(T,VN,_). bind_vars_with_names(_,[],[]) :- !. bind_vars_with_names(V,[Name=Var|VN],NewVN) :- var(V), !, (var(Var) -> (Var=V,Name=Var,NewVN=VN) ; (bind_vars_with_names(V,VN,NewVN))). bind_vars_with_names(X,VN,VN) :- atomic(X), !. bind_vars_with_names([X1|Xn],VN1,VNn) :- !, bind_vars_with_names(X1,VN1,VN2), bind_vars_with_names(Xn,VN2,VNn). bind_vars_with_names(X,VN1,VNn) :- compound_name_arguments(X,_,Args), bind_vars_with_names(Args,VN1,VNn). print_kp_predicates :- print_kp_predicates(_). % This also LOADS the modules, to access the examples: print_kp_predicates(KP) :- %TODO: ignore subtrees of because/2 all_kps_loaded, forall(kp(KP),( format("---~nKP: ~w~n",[KP]), format(" Examples:~n"), forall(catch(KP:example(Name,Scenarios),_,fail),( aggregate(sum(N),( member(scenario(Facts,_Assertion),Scenarios), length(Facts,N)), Total), format(" ~w: ~w facts~n",[Name,Total]) )), format(" Instance data:~n"), forall(xref_defined(KP,G,thread_local(_)), ( functor(G,F,N), format(" ~w~n",[F/N]) )), format(" Defined predicates:~n"), forall((xref_defined(KP,G,How),How\=thread_local(_)), ( functor(G,F,N), format(" ~w~n",[F/N]) )), format(" External predicates called:~n"), forall(( xref_called(KP, Called, _By), Called=Other:G, Other\=KP, (\+ prolog:meta_goal(G,_)) ), (functor(G,F,N), format(" ~w (~w)~n",[F/N,Other])) ), format(" UNDEFINED predicates:~n"), forall(( xref_called(KP, Called, _), (Called=Other:G -> Other\=KP ; (Called=G,Other=KP)), (\+ prolog:meta_goal(G,_)), \+ my_xref_defined(Other,G,_), \+ system_predicate(G) ), (functor(G,F,N), format(" ~w (~w)~n",[F/N,Other])) ) )). % check that the source has already been xref'ed, otherwise xref would try to load it and cause an "iri_scheme" error: my_xref_defined(M,G,Class) :- xref_current_source(M), xref_defined(M,G,Class). my_xref_called(M,Pred,By) :- xref_current_source(M), xref_called(M,Pred,By). system_predicate(G) :- predicate_property(G,built_in). system_predicate(G) :- kp_dir(D), predicate_property(G,file(F)), \+ sub_atom(F,_,_,_,D). system_predicate(example(_,_)). system_predicate(mainGoal(_,_)). system_predicate(query(_,_)). system_predicate(question(_,_)). system_predicate(question(_,_,_)). system_predicate(irrelevant_explanation(_)). system_predicate(function(_,_)). url_simple(URL,Simple) :- \+ sub_atom(URL,_,_,_,'/'), !, Simple=URL. url_simple(URL,Simple) :- parse_url(URL,L), memberchk(path(P),L), atomics_to_string(LL,'/',P), ((last(LL,Simple),Simple\='') -> true ; LL = [Simple] -> true; append(_,[Simple,_],LL)), !. url_simple(URL,URL). :- meta_predicate(must_succeed(0,+)). must_succeed(G,_) :- G, !. must_succeed(G,M) :- throw("weird_failure_of of ~w: ~w"-[G,M]). must_succeed(G) :- must_succeed(G,''). :- thread_local myDeclaredModule_/1. % remembers the module declared in the last SWISH window loaded % filters the SWISH declared module with known KPs; the term_expansion hack catches a lot of other modules too, such as 'http_stream' myDeclaredModule(M) :- myDeclaredModule_(M), kp(M), !. swish_editor_path(KP,Path) :- must_be(nonvar,KP), (kp_location(KP,File,true)->true;File=not_on_swish_storage), format(string(Path),"/p/~a",[File]), !. :- if(current_module(swish)). %%% only when running with the SWISH web server: :- use_module(swish(lib/storage)). :- use_module(swish(lib/gitty)). :- use_module(library(pengines)). %! discover_kps_gitty is det. % % Scans all Prolog files in SWISH's gitty storage for knowledge pages. RELOADS % already loaded modules, but does not delete "orphans" (modules no longer in gitty) % TODO: use '$destroy_module'(M) on those? discover_kps_gitty :- retractall(kp_location(_,_,_,true)), forall(storage_file_extension(File,pl),( storage_file(File,Data,Meta), open_string(Data, In), process_file(In,File,Meta.time,true) )). %! save_gitty_files(+ToDirectory) is det % % ERASES the directory and copies all gitty Prolog files into it % MAKE SURE ToDirectory has source versioning control! save_gitty_files(_ToDirectory) :- \+ storage_file_extension(_File,pl), !, print_message(warning,"No gitty files to save"-[]). save_gitty_files(ToDirectory) :- (exists_directory(ToDirectory)->true; make_directory(ToDirectory)), delete_directory_contents(ToDirectory), forall(storage_file_extension(File,pl),( storage_file(File,Data,Meta), directory_file_path(ToDirectory,File,Path), open(Path,write,S), write_term(S,Data,[]), close(S), set_time_file(Path, _OldTimes, [modified(Meta.time)]) )). save_gitty_files :- kp_dir(D), save_gitty_files(D). %! load_gitty_files(+FromDirectory) is det % % Updates or creates (in gitty storage) all Prolog files from the given file system directory; sub-directories are ignored. % Does not delete the other (pre-existing) gitty files % Example: load_gitty_files('/Users/mc/git/TaxKB/kb'). load_gitty_files(From) :- forall(directory_member(From,Path,[extensions([pl])]),( read_file_to_string(Path,Data,[]), time_file(Path,Modified), directory_file_path(_,File,Path), update_gitty_file(File,Modified,From,Data) )). load_gitty_files :- kp_dir(D), load_gitty_files(D). % update_gitty_file(+Filename,+ModifiedTime,+Origin,+Text) update_gitty_file(File,Modified,Origin,Data) :- web_storage:open_gittystore(Store), current_user(User,_Email), (gitty_file(Store, File, OldHead) -> ( storage_meta_data(File, Meta), NewMeta = Meta.put([previous=OldHead, modify=[any, login, owner], (public)=true, time=Modified, author=User]), gitty_update(Store, File, Data, NewMeta, _CommitRet) ) ; ( gitty_create(Store, File, Data, _{update_gitty_file:Origin, modify:[any, login, owner], public:true, time:Modified, author:User }, _CommitRet) ) ). update_gitty_file(File,Origin,Data) :- get_time(Now), update_gitty_file(File,Now,Origin,Data). %! delete_gitty_file(+GittyFile) is det % % makes the file empty, NOT a proper delete delete_gitty_file(File) :- must_be(nonvar,File), web_storage:open_gittystore(Store), gitty_file(Store, File, OldHead), % I was unable to effectively delete: % gitty:delete_head(Store, OldHead), gitty:delete_object(Store, OldHead), % this is only effective after a SWISH restart % broadcast(swish(deleted(File, OldHead))). % not doing anything, possibly missing something on the JS end % ... instead this does roughly what the DELETE REST SWISH endpoint in storage.pl does: storage_meta_data(File, Meta), NewMeta = Meta.put([previous=OldHead]), gitty_update(Store, File, "", NewMeta, _CommitRet). :- listen(swish(X),reactToSaved(X)). % note: do NOT use writes!, they would interfere with SWISH's internal REST API /* reactToSaved(created(GittyFile,Commit)) :- % discover and xref storage_file(GittyFile,Data,Meta), process_file(Data,GittyFile,Meta.time,true), reactToSaved(updated(GittyFile,Commit)). reactToSaved(updated(GittyFile,_Commit)) :- % xref kp_location(URL,GittyFile,true), xref_source(URL,[silent(true)]). */ reactToSaved(created(GittyFile,Commit)) :- reactToSaved(updated(GittyFile,Commit)). reactToSaved(updated(GittyFile,_Commit)) :- % discover (module name may have changed...) and xref %mylog(updated(GittyFile,_Commit)), storage_file(GittyFile,Data,Meta), open_string(Data,In), must_succeed(process_file(In,GittyFile,Meta.time,true)), (kp_location(URL,GittyFile,true) -> xref_source(URL,[silent(true)]) ; print_message(warning,"Could not find URL for ~w"-[GittyFile])). %! edit_kp(URL) is det % % Open the current gitty version of the knowledge page in SWISH's editor edit_kp(KP) :- kp_location(KP,_File,InGitty), (InGitty==(false) -> print_message(error,"~w is not in SWISH storage"-[KP]);( swish_editor_path(KP,Path), format(string(URL),"http://localhost:3050~a",[Path]), www_open_url(URL) )). %%%% Knowledge pages graph :- multifile user:'swish renderer'/2. % to avoid SWISH warnings in other files :- use_rendering(user:graphviz). knowledgePagesGraph(KP,dot(digraph([rankdir='LR'|Graph]))) :- % xref_defined(KP, Goal, ?How) setof(edge(From->To,[]), KP^Called^By^ByF^ByN^OtherKP^G^CalledF^CalledN^How^( kp(KP), xref_called(KP, Called, By), functor(By,ByF,ByN), From = at(ByF/ByN,KP), (Called=OtherKP:G -> true ; ( once(xref_defined(KP,Called,How)), OtherKP=KP, G=Called)), \+ prolog:meta_goal(G,_), functor(G,CalledF,CalledN), To = at(CalledF/CalledN,OtherKP) %term_string(From_,From,[quoted(false)]), term_string(To_,To,[quoted(false)]), url_simple(ArcRole_,ArcRole) ),Edges), setof(node(ID,[/*shape=Shape*/label=Label]), KP^Goal^How^GF^GN^From^EA^Pred^Abrev^( ( kp(KP), xref_defined(KP, Goal, How), functor(Goal,GF,GN), ID = at(GF/GN,KP) ; member(edge(From->ID,EA),Edges) % calls to undefined predicates ), ID=at(Pred,KP), url_simple(KP,Abrev), format(string(Label),"~w at ~w",[Pred,Abrev]) %(hypercube(R,ID) -> Shape=box3d ; Shape=ellipse) ), Nodes), append(Nodes,Edges,Items), Graph=Items. %(var(SizeInches) -> Graph=Items ; Graph = [size=SizeInches|Items]). knowledgePagesGraph(G) :- knowledgePagesGraph(_,G). :- multifile sandbox:safe_primitive/1. sandbox:safe_primitive(kp_loader:knowledgePagesGraph(_,_)). sandbox:safe_primitive(kp_loader:print_kp_predicates(_)). sandbox:safe_primitive(kp_loader:load_gitty_files). %TODO: this should be restricted to power users sandbox:safe_primitive(kp_loader:save_gitty_files). sandbox:safe_primitive(kp_loader:all_kps_loaded). sandbox:safe_primitive(web_storage:open_gittystore(_)). sandbox:safe_primitive(gitty:gitty_file(_, _, _)). sandbox:safe_primitive(gitty:load_commit(_,_,_)). sandbox:safe_primitive(gitty:gitty_update(_, _, _, _, _)). sandbox:safe_primitive(gitty:size_in_bytes(_,_)). sandbox:safe_primitive(gitty:save_object(_,_,_,_)). sandbox:safe_primitive(gitty:gitty_create(_,_,_,_,_)). %%%% assist editor navigation; cf. swish/web/js/codemirror/mode/prolog/prolog_server.js :- use_module(library(http/http_json)). :- use_module(library(http/http_dispatch)). :- use_module(library(http/http_parameters)). :- http_handler(codemirror(xref), token_references, []). token_references(Request) :- %http_read_json_dict(Request, Query, [value_string_as(atom)]), http_parameters(Request, [arity(Arity,[integer]),text(Text,[]),type(Type,[]),file(Module,[optional(true)]),uuid(UUID,[optional(true)])]), % UUID is the SWISH internal module for our current editor's text % mylog(gotQuery/Type/Text/Arity/Module/UUID), % asserta(my_request(Query)), % for debugging (nonvar(UUID) -> (xref_module(UUID,MyModule), Ignorable=[UUID,MyModule]); Ignorable=[]), catch(term_string(Term_,Text),_,fail), functor(Term_,Functor,_), (atom(Term_) -> functor(Term,Functor,Arity); Term=Term_), % hack to fix longclicks on body goals (sub_atom(Type, 0, _, _, head) -> ( % a clause head must_be(var,Module), findall( _{title:Title,line:Line,file:File,target:Functor}, ( % regex built on the Javascript side from target xref_called(OtherModule,_Mine:Term,By,_Cond,Line), functor(By,F,N), format(string(Title),"A call from ~w",[F/N]), \+ member(OtherModule,Ignorable), kp_location(OtherModule,File,_InGitty) ),Locations) ) ; sub_atom(Type, 0, _, _, goal) -> ( % a goal in a clause body findall( _{title:Title,line:Line,file:File,target:Functor}, ( xref_defined(Module,Term,How), arg(1,How,Line), format(string(Title),"A definition for ~a",[Text]), kp_location(Module,File,_InGitty) ),Locations) ) ; throw(weird_token_type(Type)) ), %Solution = _{hello: "Good Afternoon!", functor:Functor, arity:Arity, module:File}, reply_json_dict(Locations). % This at the end, as it activates the term expansion (no harm done otherwise, just some performance..): user:term_expansion((:-module(M,L)),(:-module(M,L))) :- !, assert(myDeclaredModule_(M)). :- multifile pengines:prepare_module/3. :- thread_local myCurrentModule/1. % the new temporary SWISH module where our query runs pengines:prepare_module(Module, swish, _Options) :- % this seems to hold always, but commenting it out just in case...: assertion( \+ myCurrentModule(_)), setup_kp_module(Module), assert(myCurrentModule(Module)). % should we perhaps use this_capsule...?? % there is (just arrived from the SWISH editor) a fresher version To of the declared module From % ...OR there WAS, although it no longer exists shouldMapModule(From,To) :- myDeclaredModule(From), kp(From), myCurrentModule(To), !, (moduleMapping(From,To)->true;(assert(moduleMapping(From,To)))). :- dynamic moduleMapping/2. % Nice module->transient SWISH module; remembers previous mappings, to support UI navigation later, e.g. from explanations current_user(User,Email) :- pengine_user(U), get_dict(user,U,User), Email=U.user_info.email, !. current_user(unknown_user,unknown_email). :- else. % vanilla SWI-Prolog current_user(unknown_user,unknown_email). shouldMapModule(_,_) :- fail. moduleMapping(_,_) :- fail. %! edit_kp(URL) is det % % Open the filed version of the knowledge page in the user editor edit_kp(URL) :- kp_location(URL,File,InGitty), (InGitty==(true) -> print_message(error,"That is in SWISH storage, not in the file system!");( edit(file(File)) )). discover_kps_gitty :- print_message(informational,'this only works on SWISH'-[]). load_gitty_files :- throw('this only works on SWISH '). load_gitty_files(_) :- throw('this only works on SWISH '). save_gitty_files(_) :- throw('this only works on SWISH '). save_gitty_files :- throw('this only works on SWISH '). delete_gitty_file(_) :- throw('this only works on SWISH '). update_gitty_file(_,_,_) :- throw('this only works on SWISH '). knowledgePagesGraph(_,_) :- throw('this only works on SWISH'). knowledgePagesGraph(_) :- throw('this only works on SWISH'). gitty_file(_,_,_) :- throw('this only works in SWISH gitty'). gitty_update(_, _, _, _, _) :- throw('this only works in SWISH gitty'). :- endif.