1:- module( lib, [
    2                    op( 200, fy, & ),
    3                    lib/1, lib/2   % +Repo[, +Opts]
    4        ] ).    5                     % lib_suggests/1,  % fixme: feature()
    6                     % lib_promise/2,
    7                     % lib_expects/1+2,
    8                     % lib_init/1
    9
   10:- ensure_loaded(library(apply)).        % exclude/3, ...
   11:- ensure_loaded(library(lists)).        % append/3, ...
   12:- ensure_loaded(library(debug)).        % debug/1+3, ? 
   13:- ensure_loaded(library(filesex)).      % directory_file_path/3,...
   14:- ensure_loaded(library(prolog_pack)).  % query_pack_server/3
   15
   16:- ensure_loaded('../src/lib_init').   17:- ensure_loaded('../src/lib_load').   18:- ensure_loaded('../src/lib_type').   19:- ensure_loaded('../src/lib_auxil').   20:- ensure_loaded('../src/lib_attach').   21:- ensure_loaded('../src/lib_homonyms').   22:- ensure_loaded('../src/lib_suggests').   23:- ensure_loaded('../src/lib_expects').   24:- ensure_loaded('../src/lib_promise').   25:- ensure_loaded('../src/lib_message').   26:- ensure_loaded('../src/lib_pack_install').   27
   28:- dynamic(lib_tables:lib_repo/4).             % +Repo, +Type, +Root, +Load 
   29:- dynamic(lib_tables:lib_repo_index/2).       % +Repo, +IdxFile
   30:- dynamic(lib_tables:lib_repo_homonyms/2).    % +Repo, +SrcDir
   31:- dynamic(lib_tables:lib_context/2).          % +Ctx, +Root
   32:- dynamic(lib_tables:lib_index/4).            % +Pa, +Pn, +Repo, +File. records loaded indices
   33:- dynamic(lib_tables:lib_promise/2).          % +Pids, +Cxt, +Load. hot swap Pid with loading Load
   34:- dynamic(lib_tables:lib_homonym/3).          % +Stem, +Repo, +File. record loaded homonym
   35:- dynamic(lib_tables:lib_loaded_index/2).     % +Repo, +File. tracks loaded index files
   36:- dynamic(lib_tables:lib_loaded_homonyms/2).  % 
   37:- dynamic(lib_tables:lib_attached_indices/2). % +Ctx, Repo
   38:- dynamic(lib_tables:lib_attached_homonyms/2).% +Ctx, Repo
   39:- dynamic(lib_tables:lib_lazy/1).             % +Repo
   40:- dynamic(lib_tables:lib_full/2).             % +Repo
   41:- dynamic(lib_tables:lib_packs_at/2).         % +Repo, +Dir
   42:- dynamic(lib_tables:lib_skeleton_only/1).    % +Pack
   43
   44:- multifile(user:lib_code_loader/3 ).   45
   46user:lib_code_loader(bioc, lib, lib_bioc).
   47user:lib_code_loader(r, lib, lib_r).
   48
   49% values: auto, allow option to override if set to true; false: never warn; true: always warn; install: install if missing
   50:- Opts = [access(read_write),type(atom),keep(true)],
   51   create_prolog_flag(lib_suggests_warns, auto, Opts).   52
   53lib_bioc( Rlib, Opts ) :-
   54    lib_r( Rlib, [bioc(true)|Opts] ).
   55
   56lib_r( Rlib, Opts ) :-
   57     string( Rlib ),
   58     !,
   59     atom_string( RlibAtm, Rlib ),
   60     lib_r( RlibAtm, Opts ).
   61lib_r( Rlib, _Opts ) :-
   62     getenv( 'R_LIB_REAL', RlibRealPath ),
   63     atomic_list_concat( RlibDirs, ':', RlibRealPath ),
   64     member( Rdir, RlibDirs ),
   65     member( Ext, ['','r','R'] ),
   66     file_name_extension( Rlib, Ext, Rbase ),
   67     directory_file_path( Rdir, Rbase, Rfile ),
   68     exists_file( Rfile ),
   69     !,
   70     r_call( source(+Rfile), [] ).
   71lib_r( Rlib, Opts ) :-
   72    memberchk( suggest(Sugg), Opts ),
   73    current_prolog_flag( lib_suggests_warns, SuggFlag ),
   74    (Sugg == true ; SuggFlag == debug; SuggFlag == install),
   75    !,
   76    ( current_predicate(real:r_call/2) ->
   77        true
   78        ;
   79        catch(use_module(library(real)),_,true)
   80    ),
   81    ( current_predicate(real:r_call/2) ->           
   82        real:r_call(rownames('installed.packages'()), [rvar(Rlibs)]),
   83        ( memberchk(Rlib,Rlibs) ->
   84            ( (debugging(lib);SuggFlag==debug) ->
   85                Mess = 'Loading installed R library: ~w',
   86                lib_message_report( Mess, [Rlib], informational )
   87                ;
   88                true
   89            ),
   90            r_lib_sys( Rlib )
   91            ;
   92            % not-installed Rlib...
   93            % fixme: clarify logic of warnings...
   94            ( memberchk(suggests_warns(false),Opts) ->
   95                true   % no warning, successed 
   96                ;
   97                ( (SuggFlag==install ; SuggFlag==debug)  -> 
   98                    ( prolog_pack:confirm( contact_r_server(Rlib), yes, [] ) ->
   99                        ( memberchk(bioc(true),Opts) ->
  100                            real:r_call( requireNamespace("BiocManager",quietly='TRUE'), [rvar(BiocX)] ),
  101                            (BiocX == true -> true; real:r_call('install.packages'("BiocManager"),[])),
  102                                real:r_call('BiocManager::install'(+ Rlib),  []),
  103                                real:r_call(library(Rlib), [])
  104                                ;
  105                                real:r_call('install.packages'(+ Rlib),  []),
  106                                real:r_call(library(Rlib), [])
  107                        )
  108                    ;
  109                    true
  110                    )
  111                )
  112                ;
  113                fail
  114            )
  115        )
  116        ;      % if it is still not installed 
  117        Mess1 = 'You need to install SWI-Prolog lib Real before you can lib/1-load R library: ~w',
  118        lib_message_report( Mess1, [Rlib], informational )
  119    ).
  120lib_r( Rlib, _Opts ) :-
  121    r_lib_sys( Rlib ).
  122
  123r_lib_sys( Rlib ) :-
  124     current_prolog_flag( real_suppress_lib_messages, false ),
  125     !,
  126     r_library_codes( Rlib, '', '', Rcodes ), % fixme to atom
  127     atom_codes( R, Rcodes ),
  128     real:r_send(R).
  129r_lib_sys( Rlib ) :-
  130     Pre = 'suppressPackageStartupMessages(',
  131     r_lib_codes( Rlib, Pre, ')', Rcodes ),
  132     atom_codes( R, Rcodes ),
  133     real:r_send( R ).
  134r_lib_codes( Rlib, Pre, Post, Rcodes ) :-
  135     ( is_list(Rlib) -> Rlib=Rlibs; Rlibs = [Rlib] ),
  136     atomic_list_concat( Rlibs, ',', RlibsAtm ),
  137     atomic_list_concat( [Pre,'library(',RlibsAtm,')',Post], RlibCallAtm ),
  138     atom_codes( RlibCallAtm, Rcodes ).
  139
  140% fixme: user defined ones
  141lib_src_sub_dir(src).
  142lib_src_sub_dir('src/lib').
  143lib_src_sub_dir('src/auxil' ).

?- lib( stoics_lib:kv_compose/3 ).
?- lib( stoics_lib:kv_decompose/3 ).

?- lib(stoics_lib).

?- use_module( library(stoics_lib) ).

?- use_module(library(bio_db)).

?- lib(bio_db).

?- lib(& bio_db).

?- lib(& bio_db(hs)).

?- lib(& bio_db(hs)).

?- lib(& bio_db(hs(hgnc))).

?- use_module( pack('bio_db/cell/hs/hgnc') ).

?- lib(@ bio_db)

?- load_files( library(bio_db) ).

:- lib(suggests(wgraph),[]).
:- lib(real).
:- lib(suggests(call(lib_r("GGally"),[]).

 ?- lib(Atomic).

kv_decompose( [], [], [] ).
kv_decompose( [K-V|T], [K|Tk], [V|Tv] ) :-
    kv_decompose( T, Tk, Tv ).

lib_tables:lib_index( Pname, Parity, Repo, AbsFile ).

lib_tables:lib_homonym( Stem, Repo, AbsFile ).

lib_tables:lib_loaded_indices(Repo,File)

lib_tables:lib_loaded_homonyms(Repo,Stem,File)

lib_tables:lib_attached_indices(bims,options).
lib_tables:lib_attached_homonyms(bims,false).

bims/prolog/bims.pl

  445lib_defaults( pack, [load(true),index(true),homonym(true),type(pack),mode(self)] ).
  446lib_defaults( lib, [load(false),index(true),homonym(true),type(lib),mode(self)] ).
  447lib_defaults( [suggest(true)] ).

 lib(+Operand)

 lib(+Operand, +Opts)

Loads code or/and indices of Repo into the current context.

When Repo homonym(Repository) then only the homonims of local dir (adjusted for pack dir structure) are added to as coming from Repository.

Operand

One of

homonyms(From)

attach homonyms From pack

init(Lib)

init(Lib, Cxt)

declare initilization call (library can be loaded without this firing, if so needed, as is the case for lib_mkindex/1)

suggests(Lib)

suggests(Lib, SugOpts)

it is likely you need Lib for full functionalilty. If Lib is a known library it is loaded other wise nothing is loaded.
This is useful for fringe functionalities that depend on external libraries, where we do not want the average user to do anything if library (Lib) is not there. See lib_suggests/2 for details of how to enable warning messages.

promise(Pred, Load)

Pred is needed for functionality and it can be found by loading Load, but it will only happen at Pred's first call.

expects(Pid, Mess)

expects(Pid, Mess, Call)

complains if Pid is not defined at loading time. Mess should be a debug style message with one ~w which will be called with Pid as its printing argument. If call is present, is called after the printing of the message.

version(Vers, Date)

return version and publication date

Opts

index(Idx)

whether to load indices

homonym(Hnym)

whether to load homonym file-locators

load(Load)

whether to load the main entry point of Repo

mode Mode=self

makes missing message more acurate (other value: suggests)

suggest(Dn=true)

suggest the library is downloaded if it is not locally installed ?

type(Type)

enforce a particular type of repository (pack or lib)

The defaults depend on whether Repo is a pack or a lib.

opts(Opts=PackDefs)

PackDefs= [load(true),index(true),homonym(false),type(pack)]

opts(Opts=LibDefs)

LibDefs = [load(false),index(true),homonym(true),type(lib)]

When invoked with code attaching operands (SysLibrary, Pack or Lib) the predicate will first load anything that needs to be loaded in their native module and then import predicates from that module. Attaching a lib or pack means that the predicates pointed to by indices and by file name from the target pack/lib become available to the importee. Option index(Idx) controls whether LibIndex.pl based indices are attahced whereas homonym(Hmns) control the attachment of the file names from within the filesystem of the target.

For example to only import the interface predicates of pack ex1 use

?- lib(ex1, [type(pack),load(true),index(false),homonym(false)]).

Assume that ex1 is a pack that is not installed on your Prolog installation, but you have its sources unpacked on local dir /tmp/ex1/ you can load it interface predicates with:

For example to only import the interface predicates of pack ex1 use

?- lib('/tmp/ex1', [type(pack),load(true),index(false),homonym(false)]).

Assume there is a file src/lib/foo.pl in ex1 defining predicate foo/1, then you can load its code with

?- lib('/tmp/ex1', [type(pack),load(true),index(false),homonym(true)]).
?- lib(foo/1).

The above will first load foo.pl (by means of matching its filename to the predicate name) into ex1: and then assuming that this loaded foo/1 it will import it into current context (here this is =user+).

Assuming foo.pl also defines predicate bar/2 and there is a file src/LibIndex.pl within ex1 containing the line

lib_index( bar, 2, swipl(_), user, 'lib/foo.pl' ).

Then the code for foo_bar/2 can be loaded with

?- lib('/tmp/ex1', [type(pack),load(true),index(true),homonym(false)]).
?- lib(bar/2).

Pack lib can be used to create and access skeleton packs. These packs, may load very little interface code but their code base can be loaded on demand and piece-meal. That is if a specific non-interface predicate is required, it will be located and loaded along with all its dependencies.

An example of such a pack is stoics_lib. The following commands: 1. load the minimal interface,, 2, load the code for a specific non-interface predicate.

?- lib(stoics_lib).
?- lib(kv_decompose/3).

The above two directives can be shortened to:

?- lib(stoics_lib:kv_decompose/3).

Current version can be found by:

?-
    lib( version(Vers,Date) ).
Vers = 2:10:0,
Date = date(2022, 12, 29).

author

- nicos angelopoulos

version

- 2:10 2022/12/29

To be done

- when predicate is missing from stoics_lib while loading from b_real, we get clash between main and lazy, error should be clearer (the pred select_all/3 was actually not defined in file either)

*/

  573lib( Repo ) :-
  574    % fixme: add alias() command
  575    lib( Repo, [] ).
  576
  577lib( Repo, ArgS ) :-
  578    lib_loading_context( Cxt ),
  579    lib_en_list( ArgS, Args ),
  580    lib_defaults( Defs ),
  581    append( Args, Defs, Opts ),
  582    lib( Repo, Cxt, Opts ).
  583
  584lib( Lib, Cxt, Args ) :-
  585    debug( lib, 'lib directive: ~w, in context: ~w, with opts: ~w', [Lib,Cxt,Args] ),
  586    fail.
  587lib( Pn/Pa, Cxt, Args ) :-
  588    !,
  589    lib_load( Cxt, Pn, Pa, Args ).
  590lib( Repo:Pn/Pa, Cxt, Args ) :-
  591    !,
  592    lib_explicit( Repo, Pn, Pa, Cxt, Args ).
  593lib( External,  Cxt, Opts ) :-
  594    compound( External ),
  595    External =.. [Alias,Lib],
  596    user:lib_code_loader( Alias, Mod, Pname ), 
  597    !,
  598    Goal =.. [Pname,Lib,Opts],
  599    ( catch(Mod:Goal,_,fail) ->
  600        true
  601        ;
  602        memberchk( suggest(Sugg), Opts ),
  603        lib_missing( Sugg, Lib, Cxt, Opts, true )
  604    ).
  605
  606lib( homonyms(Repo), _, _Args )  :-   
  607                  % load local homonyms as coming from Repo. can be added to
  608                  % pack to indicate that LibIndex is incomplete or missing 
  609                  % by default packs do not load their homonyms
  610    !,
  611    lib_homonyms( Repo ).
  612lib( source(Src), _Cxt, Opts ) :-
  613    !,
  614    lib_source( Src, Opts ).
  615lib( end(Src), _Cxt, Opts ) :-
  616    lib_source_end( Src, Opts ).
  617
  618% lib( alias(Alias), Cxt, Opts ) :-
  619    % !,
  620    % lib_alias( Alias, Cxt, Opts ).
  621lib( version(V,D), _, _Args ) :-
  622    !,
  623    V = 2:10:0, D = date(2022,12,29).
  624lib( suggests(Lib), _, _Args ) :- 
  625    !,
  626    lib_suggests( Lib ).
  627lib( suggests(Lib,SgOptS), _, _Args ) :-
  628    !,
  629    lib_en_list( SgOptS, SgOpts ),
  630    lib_suggests( Lib, SgOpts ).
  631lib( promise(PidS,Load), Cxt, _Args ) :-
  632    !,
  633    lib_promise( PidS, Cxt, Load ).
  634lib( expects(Lib,Mess), _, _Opts ) :-
  635    !,
  636    lib_expects( Lib, Mess ).
  637lib( expects(Lib,Mess,Goal), _, _Opts ) :-  % fixme: add note() option 
  638    !,
  639    lib_expects( Lib, Mess, Goal ).
  640lib( init(Lib), Cxt, _Opts ) :-
  641    !,
  642    lib_init( Lib, Cxt ).
  643lib( sys(SysLib), Cxt, _Opts ) :-
  644    !,
  645    % AbsOpts = [access(read),file_errors(fail),file_type(prolog)],
  646    % absolute_file_name(library(SysLib), AbsLib, AbsOpts ),
  647    absolute_file_name(library(SysLib), AbsLib ),
  648    % fixme: need map from SysLib -> Repo
  649    lib_retract_lazy( SysLib, WasLazy ),
  650    lib_sys_lazy( WasLazy, SysLib, AbsLib, ', expected,', Cxt ).
  651% testing: lib( & (bio_db(hs)) ). % which contains hgnc
  652%  map_hgnc_hgnc_symb(H,'LMTK3').
  653lib( @(Pack), Cxt, _Opts ) :-
  654    atomic( Pack ),
  655    absolute_file_name( pack(Pack), PackD, [file_type(directory),access(exist)] ),
  656    !,
  657    ( lib_tables:lib_skeleton_only(Pack) -> % fixme: shall we check it is the first one ?
  658        true
  659        ;
  660        directory_file_path( PackD, cell, CellsD ),
  661        ( exists_directory(CellsD) -> 
  662            directory_files( CellsD, AllOses ),
  663            findall( Os, (member(Os,AllOses),file_name_extension(_,pl,Os)), Oses ),
  664            debug( lib, 'Loading of all cells found pl files: ~w', [Oses] ),
  665            findall( Os, ( member(Os,Oses), directory_file_path(CellsD,Os,CellF),
  666                       %fixme: this: assumes module is same as pack ...
  667                       debug( lib, 'Loading of cells is loading: ~w', [CellF] ),
  668                       Pack:ensure_loaded(CellF),
  669                       directory_file_path(Pack,cell,RelCellP),
  670                       directory_file_path(RelCellP,Os,RelOs),
  671                       lib_export_cell(Pack,RelOs,Cxt)
  672                     ),
  673                        _OsesDash 
  674               )
  675            ; 
  676            % fixme: print warning ?
  677            debug( lib, 'Loading directory only as cells cannot be located for: ~w', Pack )
  678        )
  679    ).
  680lib( &(Pack), Cxt, _Opts ) :-
  681    atomic( Pack ),
  682    % absolute_file_name( pack(Pack), PackD, [file_type(directory),access(exist)] ),
  683    !,
  684    asserta( lib_tables:lib_skeleton_only(Pack) ),
  685    debug( lib, 'Loading of ampersand pack with: ~w', [Cxt:use_module(library(Pack))] ),
  686    Cxt:use_module( library(Pack) ),
  687    once( retract(lib_tables:lib_skeleton_only(Pack)) ).
  688
  689lib( &(CellIn), Cxt, Opts ) :-
  690    !,
  691    lib_cell( CellIn, Main, Cell, Opts ),
  692    % Cxt:use_module( library(Main) ),
  693    asserta( lib_tables:lib_skeleton_only(Main) ),
  694    debug( lib, 'Loading of ampersand cell (~w) with: ~w', [CellIn,Cxt:use_module(library(Main))] ),
  695    Cxt:use_module( library(Main) ),
  696    once( retract(lib_tables:lib_skeleton_only(Main)) ),
  697
  698    atomic_list_concat( [Main,Cell], '/', Full ),
  699    Main:ensure_loaded( pack(Full) ),
  700    lib_export_cell( Main, Full, Cxt ).
  701lib( Repo, Cxt, Opts ) :-
  702    lib_tables:lib_lazy( Repo ),
  703    !,
  704    lib_lazy_no_more( Repo, Cxt, Opts ).
  705lib( Repo, Cxt, _Args ) :-
  706    lib_tables:lib_packs_at( Cxt, PrivPacksD ),
  707    directory_file_path( PrivPacksD, Repo, PackRoot ),
  708    directory_file_path( PackRoot, prolog, PackPrologD ),
  709    directory_file_path( PackPrologD, Repo, PrologStem ),
  710    file_name_extension( PrologStem, pl, PlF ),
  711    exists_file( PlF ),
  712    !,
  713    debug( lib, 'Loading from private pack with entry point: ~p', PlF ),
  714    % ensure_loaded( PlF ).
  715    lib_defaults( pack, PackLoadDefs ),
  716    lib( Repo, PackRoot, PlF, Cxt, PackLoadDefs ).
  717lib( Repo, Cxt, Args ) :-
  718    lib_type( Repo, RepoType, RepoMod, RepoRoot, RepoLoad ),
  719    !,
  720    lib_reg_repo( RepoMod, RepoType, RepoRoot, RepoLoad, Exists ),
  721    MsId = 'Identified repo: ~w as: ~w, loading in: ~w, with root: ~w',
  722    debug( lib, MsId, [Repo,RepoType,RepoMod,RepoRoot] ),
  723    lib_defaults( RepoType, Defs ),
  724    append( Args, Defs, Opts ),
  725    lib( Exists, RepoMod, RepoRoot, RepoLoad, Cxt, Opts ).
  726lib( SysLib, Cxt, _Args ) :-
  727    AbsOpts = [access(read),file_errors(fail),file_type(prolog)],
  728    absolute_file_name(library(SysLib), AbsLib, AbsOpts ),
  729    lib_retract_lazy( SysLib, WasLazy ),
  730    lib_sys_lazy( WasLazy, SysLib, AbsLib, '', Cxt ),
  731    !.  % fixme: is this too late in the body?
  732    
  733    /*
  734    Assert = asserta( lib_tables:lib_full(SysLib,AbsLib) ),
  735    Goal = Cxt:use_module(library(SysLib)),
  736    Retract = retract(lib_tables:lib_full(SysLib,AbsLib) ),
  737    setup_call_cleanup(Assert, Goal, Retract),
  738    % catch( Cxt:use_module(library(SysLib)), _, fail ),
  739    !,
  740    debug( lib, 'System library: ~w, loaded in: ~w', [SysLib,Cxt] ).
  741    */
  742lib( Repo, Cxt, Args ) :-
  743    lib_tables:lib_repo(Repo,Type,Root,Load),
  744    !,
  745    lib_repo( Repo, Type, Root, Load, Cxt, Args ).
  746lib( Root, Cxt, Args ) :-
  747    lib_tables:lib_repo(Repo,Type,Root,Load),
  748    !,
  749    lib_repo( Repo, Type, Root, Load, Cxt, Args ).
  750lib( Pack, Cxt, Opts ) :-
  751    memberchk( suggest(Sugg), Opts ),
  752    lib_missing( Sugg, Pack, Cxt, Opts, true ),
  753    !.
  754lib( Repo, Cxt, Opts ) :-
  755    compound( Repo ),
  756    lib( &(Repo), Cxt, Opts ),
  757    !.
  758lib( Repo, Cxt, Opts ) :-
  759    memberchk( mode(Mode), Opts ),
  760    lib_not_found( Mode, Repo, Cxt ).
  761
  762lib_cell( CellIn, Main, Cell, _Opts ) :-
  763    compound( CellIn ),
  764    !,
  765    lib_term_dir( CellIn, true, Main, Cell ).
  766lib_cell( CellIn, Pack, Cell, Opts ) :-
  767    % options( pack(Pack), Opts ),
  768    memberchk( pack(Pack), Opts ),
  769    !,
  770    lib_term_dir( CellIn, false, Pack, Cell ).
  771    % lib_cell_pack( Pack, CellIn, Main, Cell, Opts ).
  772lib_cell( CellIn, _Main, _Cell, Opts ) :-
  773    throw( cannot_locate_cell_with_options(CellIn,Opts) ).
  774
  775lib_retract_lazy( SysLib, WasLazy ) :-
  776    lib_tables:lib_lazy(SysLib),
  777    !,
  778    WasLazy = true.
  779lib_retract_lazy( _SysLib, false ).
  780
  781lib_sys_lazy( _, SysLib, AbsLib, ExplicitTkn, Cxt ) :-
  782    lib_sys( SysLib, AbsLib, ExplicitTkn, Cxt ),
  783    !.   % don't need to reassert it as it is now fully loaded
  784lib_sys_lazy( true, SysLib, _AbsLib, _ExplicitTkn, _Cxt ) :-
  785    asserta( lib_tables:lib_lazy(SysLib) ),
  786    fail.
  787
  788lib_sys( SysLib, AbsLib, ExplicitTkn, Cxt  ) :-
  789    Assert = asserta( lib_tables:lib_full(SysLib,AbsLib) ),
  790    Goal = Cxt:use_module(library(SysLib)),
  791    Retract = retract(lib_tables:lib_full(SysLib,AbsLib) ),
  792    setup_call_cleanup(Assert, Goal, Retract),
  793    debug( lib, 'System~w library: ~w, loaded in: ~w', [ExplicitTkn,SysLib,Cxt] ).
  794
  795lib_not_found( self, Repo, _Cxt ) :-
  796    Mess = 'Failed to locate library:~w, (no local lib, local pack or remote pack)',
  797    lib_message_report( Mess, [Repo], informational ).
  798lib_not_found( suggests, Repo, _Cxt ) :-
  799    Mess = 'Failed to locate suggested library:~w, (no local lib, local pack or remote pack)',
  800    lib_message_report( Mess, [Repo], informational ).
  801
  802lib_explicit( Repo, Pn, Pa, Cxt, _Opts ) :-
  803    lib_tables:lib_full(Repo,_),
  804    !,   % this should be able to cope with cyclic dependencies? 
  805         % check with options
  806    Cxt:import( Repo:Pn/Pa ).
  807lib_explicit( Repo, Pn, Pa, Cxt, _Opts ) :-
  808    current_predicate( Repo:Pn/Pa ),
  809    !,
  810    lib_import_existing( Repo, Pn/Pa, Cxt ).
  811lib_explicit( Repo, Pn, Pa, Cxt, Opts ) :-
  812    lib_type( Repo, Type, Rmod, Root, Load ),
  813    lib_repo_lazy_assert( Rmod ),
  814    lib_explicit_repo( Type, Repo, Rmod, Root, Load, Pn, Pa, Cxt, Opts ),
  815    !.
  816lib_explicit( Repo, Pn, Pa, Cxt, Opts ) :-
  817    memberchk( suggest(Sugg), Opts ),
  818    lib_missing( Sugg, Repo, Cxt, Opts, false ),
  819    !,
  820    lib_explicit( Repo, Pn, Pa, Cxt, Opts ).
  821lib_explicit( Repo, Pn, Pa, Cxt, _Args ) :-
  822    % 17.03.24; the following 2 lines create a cycle
  823    % lib( Repo, Cxt, Args ),
  824    % lib( Pn/Pa, Cxt, [repo(Repo)|Args] ).
  825    Mess = 'Failed to locate: ~w within explicit repository:~w, within context: ~w',
  826    lib_message_report( Mess, [Pn/Pa,Repo,Cxt], error ).
  827
  828lib_explicit_repo( pack, Repo, Rmod, Root, Load, Pn, Pa, Cxt, Opts ) :-
  829    file_name_extension( LoadStem, pl, Load ),
  830    atomic_concat( LoadStem, '_lazy', LazyStem ),
  831    file_name_extension( LazyStem, pl, LazyF ),
  832    ( exists_file(LazyF) ->
  833        true
  834        ; 
  835        Mess = 'Lazy loading file: ~w does not exist (context: ~w)',
  836        lib_message_report( Mess, [LazyF,Cxt], informational),
  837        fail
  838    ),
  839    lib_defaults( pack, Defs ),
  840    append( Opts, Defs, All ),
  841    lib( Rmod, Root, LazyF, Cxt, All ),
  842    % ensure_loaded( Rmod:LazyF ),
  843    % lib_reg_repo( Repo, pack, Root, LazyF ),
  844    lib( Pn/Pa, Cxt, [repo(Repo)|Opts] ).
  845
  846lib_repo_lazy_assert( Repo ) :-
  847    lib_tables:lib_lazy( Repo ),
  848    !.
  849lib_repo_lazy_assert( Repo ) :-
  850    asserta( lib_tables:lib_lazy(Repo) ).
  851
  852lib_missing( false, Pack, Cxt, Opts, _Load ) :-
  853    memberchk( mode(Mode), Opts ),
  854    Mode == suggests,
  855    !,
  856    current_prolog_flag( lib_suggests_warns, WarnFlag ),
  857    lib_missing_suggested( WarnFlag, Pack, Cxt, Opts ).
  858lib_missing( false, Pack, Cxt, _Args, _Load ) :-
  859    debug( lib, 'Instructed to skip contacting server for:~w and context:~w', [Pack,Cxt] ).
  860lib_missing( true, Pack, Cxt, Args, Load ) :-
  861    prolog_pack:confirm( contact_server(Pack), yes, [] ),
  862    G = query_pack_server(search(Pack), Result, [] ),
  863    catch( prolog_pack:G, _Ball, fail ),
  864    Result \== false,
  865    lib_defaults( lib, LibDefs ),
  866    append( Args, LibDefs, Opts ),
  867    memberchk( mode(Mode), Opts ),
  868    catch( prolog_pack:pack_list(Pack), _, fail ),
  869    prolog_pack:confirm( pack_on_server(Mode,Pack), yes, [] ),
  870    !,
  871    lib_pack_install( Pack ),
  872    lib_missing_load( Load, Cxt, Pack ).
  873
  874lib_missing_suggested( WarnFlag, Pack, Cxt, Opts ) :-
  875    memberchk( WarnFlag, [auto,debug,false,install,true] ),
  876    !,
  877    lib_missing_suggested_known( WarnFlag, Pack, Cxt, Opts ).
  878lib_missing_suggested( WarnFlag, _Pack, _Cxt, _Opts ) :-
  879    throw( incorrect_value_for_flag(lib_suggests_warns(WarnFlag)) ).
  880
  881lib_missing_suggested_known( auto, Pack, Cxt, Opts ) :-
  882    memberchk( suggests_warns(WarnsOpt), Opts ),
  883    ( memberchk(WarnsOpt,[true,false]) -> true; throw(incorrent_option_value_for_option(suggest_warns(WarnsOpt))) ),
  884    lib_missing_suggested_known( WarnsOpt, Pack, Cxt, Opts ).
  885lib_missing_suggested_known( debug, Pack, Cxt, Opts ) :-
  886    lib_missing_suggested_known( true, Pack, Cxt, Opts ).
  887lib_missing_suggested_known( false, Pack, Cxt, _Opts ) :-
  888    debug( lib, 'Silently ignoring suggested, and missing library: ~w, in context: ~w', [Pack,Cxt] ).
  889lib_missing_suggested_known( true, Pack, Cxt, _Opts ) :-
  890    Mess = 'Failed to load suggested library:~w, in context: ~w',
  891    lib_message_report( Mess, [Pack,Cxt], informational ).
  892
  893lib_missing_load( true, Cxt, Pack ) :-
  894    Cxt:use_module( library(Pack) ).
  895lib_missing_load( false, _Cxt, _Pack ).
  896
  897lib_import_existing( Repo, Pn/Pa, Cxt ) :-
  898    functor( Phead, Pn, Pa ),
  899    predicate_property(Repo:Phead,exported),
  900    !,
  901    debug( lib, 'Importing from existing : ~w, into: ~w', [Repo:Pn/Pa,Cxt] ),
  902    Cxt:import( Repo:Pn/Pa ).
  903lib_import_existing( Repo, Pn/Pa, Cxt ) :-
  904    functor( Phead, Pn, Pa ),
  905    predicate_property(Repo:Phead,imported_from(Mod)),
  906    !,
  907    debug( lib, 'Importing from parent: ~w, via: ~w, pred: ~w, and context: ~w', [Mod,Repo:Pn/Pa,Cxt] ),
  908    Mod:import(Repo:Pn/Pa).
  909lib_import_existing( Repo, Pn/Pa, Cxt ) :-
  910    debug( lib, 'Exporting on: ~w and then importing:~w, into: ~w', [Repo,Pn/Pa,Cxt] ),
  911    export( Repo:Pn/Pa ),
  912    Cxt:import( Repo:Pn/Pa ).
  913
  914lib_lazy_no_more( Repo, Cxt, Opts ) :-
  915    % use_module( Repo:library(Repo) ).
  916    lib_type( Repo, Type, _RepoMod, _RepoRoot, RepoLoad ),
  917    open( RepoLoad, read, In ),
  918    read( In, ModuleDfn ), 
  919    ModuleDfn = (:- module(Repo,Exports) ),
  920    lib_defaults( Type, Defs ),
  921    append( Opts, Defs, All ),
  922    maplist( lib_explicit_exports(Repo,Cxt,All), Exports ),
  923    close( In ),
  924    !.
  925lib_lazy_no_more( Repo, Cxt, Opts ) :-
  926    throw( failed_to_unset_lazy_mode_for(Repo,Cxt,Opts) ).
  927
  928lib_explicit_exports( Repo, Cxt, Opts, Pn/Pa) :-
  929    lib_explicit( Repo, Pn, Pa, Cxt, Opts ).
  930
  931% lib_alias( Alias, Cxt, Opts ) :-
  932    % !,
  933    % absolute_file_name( Alias, Dir, [access(exist)] ),
  934    % lib( Dir, Cxt, Opts ).
  935% lib_alias( Alias, _Cxt, _Opts ) :-
  936    % throw( alias_does_not_correspont_to_lib(Alias) ).
  937
  938lib( Repo, Root, Load, Cxt, Opts ) :-
  939    lib( false, Repo, Root, Load, Cxt, Opts ).
  940
  941% testing: 18.11.22:
  942/*
  943lib( true, Repo, Root, _Load, Cxt, _Opts ) :-
  944    Mess = 'lib/4, not loading anything for lib that already existed. Cxt: ~w, repo: ~w, root:~w',
  945    debug( lib, Mess, [Cxt,Repo,Root] ),
  946    !.
  947    */
  948lib( _, Repo, Root, Load, Cxt, Opts ) :-
  949    ( catch(lib_load_repo_root_index_file(Repo,Root), _, true ) -> true; true ),
  950    Setup = asserta( lib_tables:lib_context(Repo,Root) ),
  951    Goal  = lib_load_file( Load, Repo, Opts ),
  952    Clean = ( once(retract(lib_tables:lib_context(Repo,Root))) ),
  953    debug( lib, 'lib/4: ~w', setup_call_cleanup(Setup, Goal, Clean) ),
  954    setup_call_cleanup(Setup, Goal, Clean),
  955    findall( _, 
  956                    (   predicate_property(Repo:Ph,exported),
  957                        functor(Ph,Pn,Pa),
  958                        Cxt:import(Repo:Pn/Pa)
  959                    )
  960                    ,
  961                        _ ),
  962    memberchk( index(IdxB), Opts ),
  963    lib_attach_indices( IdxB, Root, Repo, Cxt ),
  964    memberchk( homonym(LocB), Opts ),
  965    lib_attach_filenames( LocB, Root, Repo, Cxt ).
  966
  967lib_repo( Repo, Type, Root, Load, Cxt, Args ) :-
  968    Mess = 'Located in memory repo:~w of type: ~w, loading in: ~w, with root: ~w',
  969    debug( lib, Mess, [Repo,Type,Repo,Root] ),
  970    lib_defaults( Type, Defs ),
  971    append( Args, Defs, Opts ),
  972    lib( Repo, Root, Load, Cxt, Opts ),
  973    findall( _, (predicate_property(Repo:Phead,exported),functor(Phead,Pn,Pa),Cxt:import(Repo:Pn/Pa)), _ ).
  974
  975lib_source( Repo, Opts ) :-
  976    prolog_load_context( directory, Base ), 
  977    directory_file_path( Root, prolog, Base ),
  978    !,
  979    % next N lines accommodate for private packs...
  980    directory_file_path( Root, src, Srot ),
  981    directory_file_path( Srot, packs, PrivP ),
  982    ( exists_directory(PrivP) -> assert( lib_tables:lib_packs_at(Repo,PrivP) ); true ),
  983    % end of N lines
  984    asserta( lib_tables:lib_context(Repo,Root) ),
  985    ( memberchk(index(Idx),Opts) -> true; Idx = false ),
  986    lib_source_index( Idx, Root, Repo ),
  987    ( memberchk(homonyms(Hmns),Opts) -> true; Hmns = false ),
  988    lib_source_homonyms( Hmns, Repo ).
  989lib_source( Repo, Opts ) :-
  990    compound( Repo ),
  991    % we are within a cell of a pack...
  992    Repo =.. [Pack,Cell],  % fixme: allow for more complex terms
  993    prolog_load_context( directory, Base ), 
  994    % directory_file_path( Base, src, Srot ),
  995    atomic_list_concat( [Pack,Cell], '_', Mod ),
  996    asserta( lib_tables:lib_context(Mod,Base) ),
  997    ( memberchk(index(Idx),Opts) -> true; Idx = false ),
  998    lib_source_index( Idx, Base, Mod ),
  999    ( memberchk(homonyms(Hmns),Opts) -> true; Hmns = false ),
 1000    lib_source_homonyms( Hmns, Repo ).
 1001    
 1002lib_source_index( true, Root, Repo ) :-
 1003    lib_src_sub_dir( Sub ),
 1004    directory_file_path( Root, Sub, AbsSrc ),
 1005    directory_file_path( AbsSrc, 'LibIndex.pl', LibIndex ),
 1006    exists_file( LibIndex ),
 1007    !,
 1008    lib_load_index_file( LibIndex, Repo ).
 1009lib_source_index( false, _Root, _Repo ).
 1010
 1011lib_source_homonyms( true, Repo ) :-
 1012    % :- dynamic( lib_tables:lib_loaded_homonyms/2 ).  % 
 1013    lib_homonyms( Repo ),
 1014    !.
 1015lib_source_homonyms( false, _Repo ).
 1016
 1017lib_source_end( Repo, _Opts ) :-
 1018    compound( Repo ),
 1019    % then we are within a cell of a pack
 1020    !,
 1021    Repo =.. [Pack,Cell],  % fixme: allow for more complex terms
 1022    atomic_list_concat( [Pack,Cell], '_', Mod ),
 1023    retractall( lib_tables:lib_context(Mod,_Root1) ),
 1024    retractall( lib_tables:lib_packs_at(Mod,_) ).
 1025lib_source_end( Repo, _Opts ) :-
 1026    retractall( lib_tables:lib_context(Repo,_Root1) ),
 1027    retractall( lib_tables:lib_packs_at(Repo,_) ).
 1028
 1029lib_term_dir( DirIn, _Top, _Main, Dir ) :-
 1030    atomic( DirIn ),
 1031    !,
 1032    DirIn = Dir.
 1033lib_term_dir( LeftIn/Leaf, Top, Main, Dir ) :-
 1034    !,
 1035    lib_term_dir( LeftIn, Top, Main, Left ),
 1036    atomic_list_concat( [Left,Leaf], '/', Dir ).
 1037lib_term_dir( DirIn, Top, Main, Dir ) :-
 1038    functor( DirIn, TNm, 1 ),
 1039    !,
 1040    arg( 1, DirIn, SubIn ),
 1041    lib_term_dir( SubIn, false, Main, Sub ),
 1042    ( Top == true -> TNm = Main,
 1043                     atomic_list_concat( [cell,Sub], '/', Dir )
 1044                   ; atomic_list_concat( [TNm,Sub], '/', Dir )
 1045    ).
 1046lib_term_dir( DirIn, Top, _Main, _Dir ) :-
 1047    throw( cannot_de_term_dir(DirIn,Top) ).
 1048
 1049% import all predicates that are defined by RelCell into module defined by pack Main.
 1050lib_export_cell( Main, RelCell, Cxt ) :-
 1051    lib_pack_module( Main, Cxt, Mod ),
 1052    lib_cell_module( Mod, RelCell, Cod ),
 1053    findall( Pid, (
 1054                        ( 
 1055                        predicate_property(Mod:Pid,imported_from(Cod))
 1056                        ;
 1057                        ( predicate_property(Cod:Pid,imported_from(Common)),
 1058                          predicate_property(Mod:Pid,imported_from(Common))
 1059                        )
 1060                        ),
 1061                        \+ predicate_property(Cxt:Pid,_),
 1062                        functor( Pid, Pnm, Par ),
 1063                        % export(Mod:Pid),
 1064                        % Cxt:import(Mod:Pid)
 1065                        Cxt:import(Cod:Pnm/Par),
 1066                        Cxt:export(Cxt:Pnm/Par)
 1067                  ), Pids ),
 1068    debug( lib, 'lib imported in context: ~w, from mod: ~w, having cell, ~w, the predicates: ~w', [Cxt,Main,RelCell,Pids] ).
 1069
 1070% finds the module defined by a loaded pack file...
 1071lib_pack_module( Main, Cxt, Mod ) :-
 1072    absolute_file_name( pack(Main), PackMain ),
 1073    directory_file_path( PackMain, prolog, PrologMain ),
 1074    directory_file_path( PrologMain, Main, MainF ),
 1075    file_name_extension( MainF, pl, PlF ),
 1076    exists_file( PlF ),
 1077    lib_pack_file_module( PlF, Main, Cxt, Mod ),
 1078    !.
 1079lib_pack_module( Main, Cxt, Mod ) :-
 1080    throw( cannot_locate_loaded_module_for(Main,Cxt,Mod) ).
 1081
 1082lib_pack_file_module( PlF, Main, Cxt, Mod ) :-
 1083    predicate_property( Cxt:Pred, file(PlF) ),
 1084    predicate_property( Cxt:Pred, imported_from(Mod) ),
 1085    !,
 1086    debug( lib, 'Commiting to mod: ~w, for main pack: ~w in context: ~w', [Mod,Main,Cxt] ).
 1087% fixme: we need this for ?- lib(bio_db).  use_module(library(bio_db)) works fine because of initialization delay ?
 1088lib_pack_file_module( PlF, _Main, _Cxt, Mod ) :-
 1089    exists_file( PlF ),
 1090    open( PlF, read, In ),
 1091    read( In, Term ),
 1092    close( In ),
 1093    Term = ( :- module(Mod,_) ).
 1094
 1095lib_cell_module( Mod, Rel, Cod ) :-
 1096    absolute_file_name( pack(Rel), PlF, [file_type(prolog),access(read)] ),
 1097    predicate_property( Mod:Pid, file(PlF) ), 
 1098    predicate_property( Mod:Pid, imported_from(Cod) ), 
 1099    !,
 1100    debug( lib, 'Commiting to cell mod: ~w, for main mod: ~w and relative : ~w', [Cod,Mod,Rel] ).
 1101lib_cell_module( Mod, Rel, Cod ) :-
 1102    throw( cannot_locate_loaded_module_cell(Mod,Rel,Cod) )