1/*  Part of SWI-Prolog
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2012-2021, VU University Amsterdam
    7                              CWI, Amsterdam
    8                              SWI-Prolog Solutions b.v.
    9    All rights reserved.
   10
   11    Redistribution and use in source and binary forms, with or without
   12    modification, are permitted provided that the following conditions
   13    are met:
   14
   15    1. Redistributions of source code must retain the above copyright
   16       notice, this list of conditions and the following disclaimer.
   17
   18    2. Redistributions in binary form must reproduce the above copyright
   19       notice, this list of conditions and the following disclaimer in
   20       the documentation and/or other materials provided with the
   21       distribution.
   22
   23    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   24    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   25    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   26    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   27    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   28    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   29    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   30    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   31    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   33    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   34    POSSIBILITY OF SUCH DAMAGE.
   35*/
   36
   37:- module(prolog_pack,
   38          [ pack_list_installed/0,
   39            pack_info/1,                % +Name
   40            pack_list/1,                % +Keyword
   41            pack_search/1,              % +Keyword
   42            pack_install/1,             % +Name
   43            pack_install/2,             % +Name, +Options
   44            pack_upgrade/1,             % +Name
   45            pack_rebuild/1,             % +Name
   46            pack_rebuild/0,             % All packages
   47            pack_remove/1,              % +Name
   48            pack_property/2,            % ?Name, ?Property
   49            pack_attach/2,              % +Dir, +Options
   50
   51            pack_url_file/2             % +URL, -File
   52          ]).   53:- use_module(library(apply)).   54:- use_module(library(error)).   55:- use_module(library(option)).   56:- use_module(library(readutil)).   57:- use_module(library(lists)).   58:- use_module(library(filesex)).   59:- use_module(library(xpath)).   60:- use_module(library(settings)).   61:- use_module(library(uri)).   62:- use_module(library(dcg/basics)).   63:- use_module(library(http/http_open)).   64:- use_module(library(http/json)).   65:- use_module(library(http/http_client), []).   % plugin for POST support
   66:- use_module(library(prolog_config)).   67:- use_module(library(debug), [assertion/1]).   68:- use_module(library(pairs), [group_pairs_by_key/2]).   69% Stuff we may not have and may not need
   70:- autoload(library(git)).   71:- autoload(library(sgml)).   72:- autoload(library(sha)).   73:- autoload(library(build/tools)).

   90:- multifile
   91    environment/2.                          % Name, Value
   92
   93:- dynamic
   94    pack_requires/2,                        % Pack, Requirement
   95    pack_provides_db/2.                     % Pack, Provided
   96
   97
   98                 /*******************************
   99                 *          CONSTANTS           *
  100                 *******************************/
  101
  102:- setting(server, atom, 'https://www.swi-prolog.org/pack/',
  103           'Server to exchange pack information').  104
  105
  106                 /*******************************
  107                 *         PACKAGE INFO         *
  108                 *******************************/

 current_pack(?Pack) is nondet

 current_pack(?Pack, ?Dir) is nondet

True if Pack is a currently installed pack.

  115current_pack(Pack) :-
  116    current_pack(Pack, _).
  117
  118current_pack(Pack, Dir) :-
  119    '$pack':pack(Pack, Dir).

 pack_list_installed is det

List currently installed packages. Unlike pack_list/1, only locally installed packages are displayed and no connection is made to the internet.

See also

- Use pack_list/1 to find packages.

  129pack_list_installed :-
  130    findall(Pack, current_pack(Pack), Packages0),
  131    Packages0 \== [],
  132    !,
  133    sort(Packages0, Packages),
  134    length(Packages, Count),
  135    format('Installed packages (~D):~n~n', [Count]),
  136    maplist(pack_info(list), Packages),
  137    validate_dependencies.
  138pack_list_installed :-
  139    print_message(informational, pack(no_packages_installed)).

 pack_info(+Pack)

Print more detailed information about Pack.

  145pack_info(Name) :-
  146    pack_info(info, Name).
  147
  148pack_info(Level, Name) :-
  149    must_be(atom, Name),
  150    findall(Info, pack_info(Name, Level, Info), Infos0),
  151    (   Infos0 == []
  152    ->  print_message(warning, pack(no_pack_installed(Name))),
  153        fail
  154    ;   true
  155    ),
  156    update_dependency_db(Name, Infos0),
  157    findall(Def,  pack_default(Level, Infos, Def), Defs),
  158    append(Infos0, Defs, Infos1),
  159    sort(Infos1, Infos),
  160    show_info(Name, Infos, [info(Level)]).
  161
  162
  163show_info(_Name, _Properties, Options) :-
  164    option(silent(true), Options),
  165    !.
  166show_info(Name, Properties, Options) :-
  167    option(info(list), Options),
  168    !,
  169    memberchk(title(Title), Properties),
  170    memberchk(version(Version), Properties),
  171    format('i ~w@~w ~28|- ~w~n', [Name, Version, Title]).
  172show_info(Name, Properties, _) :-
  173    !,
  174    print_property_value('Package'-'~w', [Name]),
  175    findall(Term, pack_level_info(info, Term, _, _), Terms),
  176    maplist(print_property(Properties), Terms).
  177
  178print_property(_, nl) :-
  179    !,
  180    format('~n').
  181print_property(Properties, Term) :-
  182    findall(Term, member(Term, Properties), Terms),
  183    Terms \== [],
  184    !,
  185    pack_level_info(_, Term, LabelFmt, _Def),
  186    (   LabelFmt = Label-FmtElem
  187    ->  true
  188    ;   Label = LabelFmt,
  189        FmtElem = '~w'
  190    ),
  191    multi_valued(Terms, FmtElem, FmtList, Values),
  192    atomic_list_concat(FmtList, ', ', Fmt),
  193    print_property_value(Label-Fmt, Values).
  194print_property(_, _).
  195
  196multi_valued([H], LabelFmt, [LabelFmt], Values) :-
  197    !,
  198    H =.. [_|Values].
  199multi_valued([H|T], LabelFmt, [LabelFmt|LT], Values) :-
  200    H =.. [_|VH],
  201    append(VH, MoreValues, Values),
  202    multi_valued(T, LabelFmt, LT, MoreValues).
  203
  204
  205pvalue_column(24).
  206print_property_value(Prop-Fmt, Values) :-
  207    !,
  208    pvalue_column(C),
  209    atomic_list_concat(['~w:~t~*|', Fmt, '~n'], Format),
  210    format(Format, [Prop,C|Values]).
  211
  212pack_info(Name, Level, Info) :-
  213    '$pack':pack(Name, BaseDir),
  214    (   Info = directory(BaseDir)
  215    ;   pack_info_term(BaseDir, Info)
  216    ),
  217    pack_level_info(Level, Info, _Format, _Default).
  218
  219:- public pack_level_info/4.                    % used by web-server
  220
  221pack_level_info(_,    title(_),         'Title',                   '<no title>').
  222pack_level_info(_,    version(_),       'Installed version',       '<unknown>').
  223pack_level_info(info, directory(_),     'Installed in directory',  -).
  224pack_level_info(info, author(_, _),     'Author'-'~w <~w>',        -).
  225pack_level_info(info, maintainer(_, _), 'Maintainer'-'~w <~w>',    -).
  226pack_level_info(info, packager(_, _),   'Packager'-'~w <~w>',      -).
  227pack_level_info(info, home(_),          'Home page',               -).
  228pack_level_info(info, download(_),      'Download URL',            -).
  229pack_level_info(_,    provides(_),      'Provides',                -).
  230pack_level_info(_,    requires(_),      'Requires',                -).
  231pack_level_info(_,    conflicts(_),     'Conflicts with',          -).
  232pack_level_info(_,    replaces(_),      'Replaces packages',       -).
  233pack_level_info(info, library(_),	'Provided libraries',      -).
  234
  235pack_default(Level, Infos, Def) :-
  236    pack_level_info(Level, ITerm, _Format, Def),
  237    Def \== (-),
  238    \+ memberchk(ITerm, Infos).

 pack_info_term(+PackDir, ?Info) is nondet

True when Info is meta-data for the package PackName.

  244pack_info_term(BaseDir, Info) :-
  245    directory_file_path(BaseDir, 'pack.pl', InfoFile),
  246    catch(
  247        setup_call_cleanup(
  248            open(InfoFile, read, In),
  249            term_in_stream(In, Info),
  250            close(In)),
  251        error(existence_error(source_sink, InfoFile), _),
  252        ( print_message(error, pack(no_meta_data(BaseDir))),
  253          fail
  254        )).
  255pack_info_term(BaseDir, library(Lib)) :-
  256    atom_concat(BaseDir, '/prolog/', LibDir),
  257    atom_concat(LibDir, '*.pl', Pattern),
  258    expand_file_name(Pattern, Files),
  259    maplist(atom_concat(LibDir), Plain, Files),
  260    convlist(base_name, Plain, Libs),
  261    member(Lib, Libs).
  262
  263base_name(File, Base) :-
  264    file_name_extension(Base, pl, File).
  265
  266term_in_stream(In, Term) :-
  267    repeat,
  268        read_term(In, Term0, []),
  269        (   Term0 == end_of_file
  270        ->  !, fail
  271        ;   Term = Term0,
  272            valid_info_term(Term0)
  273        ).
  274
  275valid_info_term(Term) :-
  276    Term =.. [Name|Args],
  277    same_length(Args, Types),
  278    Decl =.. [Name|Types],
  279    (   pack_info_term(Decl)
  280    ->  maplist(valid_info_arg, Types, Args)
  281    ;   print_message(warning, pack(invalid_info(Term))),
  282        fail
  283    ).
  284
  285valid_info_arg(Type, Arg) :-
  286    must_be(Type, Arg).

 pack_info_term(?Term) is nondet

True when Term describes name and arguments of a valid package info term.

  293pack_info_term(name(atom)).                     % Synopsis
  294pack_info_term(title(atom)).
  295pack_info_term(keywords(list(atom))).
  296pack_info_term(description(list(atom))).
  297pack_info_term(version(version)).
  298pack_info_term(author(atom, email_or_url_or_empty)).     % Persons
  299pack_info_term(maintainer(atom, email_or_url)).
  300pack_info_term(packager(atom, email_or_url)).
  301pack_info_term(pack_version(nonneg)).           % Package convention version
  302pack_info_term(home(atom)).                     % Home page
  303pack_info_term(download(atom)).                 % Source
  304pack_info_term(provides(atom)).                 % Dependencies
  305pack_info_term(requires(dependency)).
  306pack_info_term(conflicts(dependency)).          % Conflicts with package
  307pack_info_term(replaces(atom)).                 % Replaces another package
  308pack_info_term(autoload(boolean)).              % Default installation options
  309
  310:- multifile
  311    error:has_type/2.  312
  313error:has_type(version, Version) :-
  314    atom(Version),
  315    version_data(Version, _Data).
  316error:has_type(email_or_url, Address) :-
  317    atom(Address),
  318    (   sub_atom(Address, _, _, _, @)
  319    ->  true
  320    ;   uri_is_global(Address)
  321    ).
  322error:has_type(email_or_url_or_empty, Address) :-
  323    (   Address == ''
  324    ->  true
  325    ;   error:has_type(email_or_url, Address)
  326    ).
  327error:has_type(dependency, Value) :-
  328    is_dependency(Value, _Token, _Version).
  329
  330version_data(Version, version(Data)) :-
  331    atomic_list_concat(Parts, '.', Version),
  332    maplist(atom_number, Parts, Data).
  333
  334is_dependency(Token, Token, *) :-
  335    atom(Token).
  336is_dependency(Term, Token, VersionCmp) :-
  337    Term =.. [Op,Token,Version],
  338    cmp(Op, _),
  339    version_data(Version, _),
  340    VersionCmp =.. [Op,Version].
  341
  342cmp(<,  @<).
  343cmp(=<, @=<).
  344cmp(==, ==).
  345cmp(>=, @>=).
  346cmp(>,  @>).
  347
  348
  349                 /*******************************
  350                 *            SEARCH            *
  351                 *******************************/

 pack_search(+Query) is det

 pack_list(+Query) is det

Query package server and installed packages and display results. Query is matches case-insensitively against the name and title of known and installed packages. For each matching package, a single line is displayed that provides:

• Installation status
  • p: package, not installed
  • i: installed package; up-to-date with public version
  • U: installed package; can be upgraded
  • A: installed package; newer than publically available
  • l: installed package; not on server
• Name@Version
• Name@Version(ServerVersion)
• Title

Hint: ?- pack_list(''). lists all packages.

The predicates pack_list/1 and pack_search/1 are synonyms. Both contact the package server at http://www.swi-prolog.org to find available packages.

See also

- pack_list_installed/0 to list installed packages without contacting the server.

  380pack_list(Query) :-
  381    pack_search(Query).
  382
  383pack_search(Query) :-
  384    query_pack_server(search(Query), Result, []),
  385    (   Result == false
  386    ->  (   local_search(Query, Packs),
  387            Packs \== []
  388        ->  forall(member(pack(Pack, Stat, Title, Version, _), Packs),
  389                   format('~w ~w@~w ~28|- ~w~n',
  390                          [Stat, Pack, Version, Title]))
  391        ;   print_message(warning, pack(search_no_matches(Query)))
  392        )
  393    ;   Result = true(Hits),
  394        local_search(Query, Local),
  395        append(Hits, Local, All),
  396        sort(All, Sorted),
  397        list_hits(Sorted)
  398    ).
  399
  400list_hits([]).
  401list_hits([ pack(Pack, i, Title, Version, _),
  402            pack(Pack, p, Title, Version, _)
  403          | More
  404          ]) :-
  405    !,
  406    format('i ~w@~w ~28|- ~w~n', [Pack, Version, Title]),
  407    list_hits(More).
  408list_hits([ pack(Pack, i, Title, VersionI, _),
  409            pack(Pack, p, _,     VersionS, _)
  410          | More
  411          ]) :-
  412    !,
  413    version_data(VersionI, VDI),
  414    version_data(VersionS, VDS),
  415    (   VDI @< VDS
  416    ->  Tag = ('U')
  417    ;   Tag = ('A')
  418    ),
  419    format('~w ~w@~w(~w) ~28|- ~w~n', [Tag, Pack, VersionI, VersionS, Title]),
  420    list_hits(More).
  421list_hits([ pack(Pack, i, Title, VersionI, _)
  422          | More
  423          ]) :-
  424    !,
  425    format('l ~w@~w ~28|- ~w~n', [Pack, VersionI, Title]),
  426    list_hits(More).
  427list_hits([pack(Pack, Stat, Title, Version, _)|More]) :-
  428    format('~w ~w@~w ~28|- ~w~n', [Stat, Pack, Version, Title]),
  429    list_hits(More).
  430
  431
  432local_search(Query, Packs) :-
  433    findall(Pack, matching_installed_pack(Query, Pack), Packs).
  434
  435matching_installed_pack(Query, pack(Pack, i, Title, Version, URL)) :-
  436    current_pack(Pack),
  437    findall(Term,
  438            ( pack_info(Pack, _, Term),
  439              search_info(Term)
  440            ), Info),
  441    (   sub_atom_icasechk(Pack, _, Query)
  442    ->  true
  443    ;   memberchk(title(Title), Info),
  444        sub_atom_icasechk(Title, _, Query)
  445    ),
  446    option(title(Title), Info, '<no title>'),
  447    option(version(Version), Info, '<no version>'),
  448    option(download(URL), Info, '<no download url>').
  449
  450search_info(title(_)).
  451search_info(version(_)).
  452search_info(download(_)).
  453
  454
  455                 /*******************************
  456                 *            INSTALL           *
  457                 *******************************/

 pack_install(+Spec:atom) is det

Install a package. Spec is one of

• Archive file name
• HTTP URL of an archive file name. This URL may contain a star (*) for the version. In this case pack_install asks for the directory content and selects the latest version.
• GIT URL (not well supported yet)
• A local directory name given as file:// URL or '.'
• A package name. This queries the package repository at http://www.swi-prolog.org

After resolving the type of package, pack_install/2 is used to do the actual installation.

  475pack_install(Spec) :-
  476    pack_default_options(Spec, Pack, [], Options),
  477    pack_install(Pack, [pack(Pack)|Options]).

 pack_default_options(+Spec, -Pack, +OptionsIn, -Options) is det

Establish the pack name (Pack) and install options from a specification and options (OptionsIn) provided by the user.

  484pack_default_options(_Spec, Pack, OptsIn, Options) :-
  485    option(already_installed(pack(Pack,_Version)), OptsIn),
  486    !,
  487    Options = OptsIn.
  488pack_default_options(_Spec, Pack, OptsIn, Options) :-
  489    option(url(URL), OptsIn),
  490    !,
  491    (   option(git(_), OptsIn)
  492    ->  Options = OptsIn
  493    ;   git_url(URL, Pack)
  494    ->  Options = [git(true)|OptsIn]
  495    ;   Options = OptsIn
  496    ),
  497    (   nonvar(Pack)
  498    ->  true
  499    ;   option(pack(Pack), Options)
  500    ->  true
  501    ;   pack_version_file(Pack, _Version, URL)
  502    ).
  503pack_default_options(Archive, Pack, _, Options) :-      % Install from archive
  504    must_be(atom, Archive),
  505    \+ uri_is_global(Archive),
  506    expand_file_name(Archive, [File]),
  507    exists_file(File),
  508    !,
  509    pack_version_file(Pack, Version, File),
  510    uri_file_name(FileURL, File),
  511    Options = [url(FileURL), version(Version)].
  512pack_default_options(URL, Pack, _, Options) :-
  513    git_url(URL, Pack),
  514    !,
  515    Options = [git(true), url(URL)].
  516pack_default_options(FileURL, Pack, _, Options) :-      % Install from directory
  517    uri_file_name(FileURL, Dir),
  518    exists_directory(Dir),
  519    pack_info_term(Dir, name(Pack)),
  520    !,
  521    (   pack_info_term(Dir, version(Version))
  522    ->  uri_file_name(DirURL, Dir),
  523        Options = [url(DirURL), version(Version)]
  524    ;   throw(error(existence_error(key, version, Dir),_))
  525    ).
  526pack_default_options('.', Pack, _, Options) :-          % Install from CWD
  527    pack_info_term('.', name(Pack)),
  528    !,
  529    working_directory(Dir, Dir),
  530    (   pack_info_term(Dir, version(Version))
  531    ->  uri_file_name(DirURL, Dir),
  532        Options = [url(DirURL), version(Version) | Options1],
  533        (   current_prolog_flag(windows, true)
  534        ->  Options1 = []
  535        ;   Options1 = [link(true), rebuild(make)]
  536        )
  537    ;   throw(error(existence_error(key, version, Dir),_))
  538    ).
  539pack_default_options(URL, Pack, _, Options) :-          % Install from URL
  540    pack_version_file(Pack, Version, URL),
  541    download_url(URL),
  542    !,
  543    available_download_versions(URL, [URLVersion-LatestURL|_]),
  544    Options = [url(LatestURL)|VersionOptions],
  545    version_options(Version, URLVersion, VersionOptions).
  546pack_default_options(Pack, Pack, OptsIn, Options) :-    % Install from name
  547    \+ uri_is_global(Pack),                             % ignore URLs
  548    query_pack_server(locate(Pack), Reply, OptsIn),
  549    (   Reply = true(Results)
  550    ->  pack_select_candidate(Pack, Results, OptsIn, Options)
  551    ;   print_message(warning, pack(no_match(Pack))),
  552        fail
  553    ).
  554
  555version_options(Version, Version, [version(Version)]) :- !.
  556version_options(Version, _, [version(Version)]) :-
  557    Version = version(List),
  558    maplist(integer, List),
  559    !.
  560version_options(_, _, []).

 pack_select_candidate(+Pack, +AvailableVersions, +OptionsIn, -Options)

Select from available packages.

  566pack_select_candidate(Pack, [Version-_|_], Options,
  567                      [already_installed(pack(Pack, Installed))|Options]) :-
  568    current_pack(Pack),
  569    pack_info(Pack, _, version(InstalledAtom)),
  570    atom_version(InstalledAtom, Installed),
  571    Installed @>= Version,
  572    !.
  573pack_select_candidate(Pack, Available, Options, OptsOut) :-
  574    option(url(URL), Options),
  575    memberchk(_Version-URLs, Available),
  576    memberchk(URL, URLs),
  577    !,
  578    (   git_url(URL, Pack)
  579    ->  Extra = [git(true)]
  580    ;   Extra = []
  581    ),
  582    OptsOut = [url(URL), inquiry(true) | Extra].
  583pack_select_candidate(Pack, [Version-[URL]|_], Options,
  584                      [url(URL), git(true), inquiry(true)]) :-
  585    git_url(URL, Pack),
  586    !,
  587    confirm(install_from(Pack, Version, git(URL)), yes, Options).
  588pack_select_candidate(Pack, [Version-[URL]|More], Options,
  589                      [url(URL), inquiry(true)]) :-
  590    (   More == []
  591    ->  !
  592    ;   true
  593    ),
  594    confirm(install_from(Pack, Version, URL), yes, Options),
  595    !.
  596pack_select_candidate(Pack, [Version-URLs|_], Options,
  597                      [url(URL), inquiry(true)|Rest]) :-
  598    maplist(url_menu_item, URLs, Tagged),
  599    append(Tagged, [cancel=cancel], Menu),
  600    Menu = [Default=_|_],
  601    menu(pack(select_install_from(Pack, Version)),
  602         Menu, Default, Choice, Options),
  603    (   Choice == cancel
  604    ->  fail
  605    ;   Choice = git(URL)
  606    ->  Rest = [git(true)]
  607    ;   Choice = URL,
  608        Rest = []
  609    ).
  610
  611url_menu_item(URL, git(URL)=install_from(git(URL))) :-
  612    git_url(URL, _),
  613    !.
  614url_menu_item(URL, URL=install_from(URL)).

 pack_install(+Name, +Options) is det

Install package Name. Processes the options below. Default options as would be used by pack_install/1 are used to complete the provided Options.

url(+URL)

Source for downloading the package

package_directory(+Dir)

Directory into which to install the package.

global(+Boolean)

If true, install in the XDG common application data path, making the pack accessible to everyone. If false, install in the XDG user application data path, making the pack accessible for the current user only. If the option is absent, use the first existing and writable directory. If that doesn't exist find locations where it can be created and prompt the user to do so.

interactive(+Boolean)

Use default answer without asking the user if there is a default action.

silent(+Boolean)

If true (default false), suppress informational progress messages.

upgrade(+Boolean)

If true (default false), upgrade package if it is already installed.

rebuild(Condition)

Rebuild the foreign components. Condition is one of if_absent (default, do nothing if the directory with foreign resources exists), make (run make) or true (run `make distclean` followed by the default configure and build steps).

test(Boolean)

If true (default), run the pack tests.

git(+Boolean)

If true (default false unless URL ends with =.git=), assume the URL is a GIT repository.

link(+Boolean)

Can be used if the installation source is a local directory and the file system supports symbolic links. In this case the system adds the current directory to the pack registration using a symbolic link and performs the local installation steps.

Non-interactive installation can be established using the option interactive(false). It is adviced to install from a particular trusted URL instead of the plain pack name for unattented operation.

  665pack_install(Spec, Options) :-
  666    pack_default_options(Spec, Pack, Options, DefOptions),
  667    (   option(already_installed(Installed), DefOptions)
  668    ->  print_message(informational, pack(already_installed(Installed)))
  669    ;   merge_options(Options, DefOptions, PackOptions),
  670        update_dependency_db,
  671        pack_install_dir(PackDir, PackOptions),
  672        pack_install(Pack, PackDir, PackOptions)
  673    ).
  674
  675pack_install_dir(PackDir, Options) :-
  676    option(package_directory(PackDir), Options),
  677    !.
  678pack_install_dir(PackDir, Options) :-
  679    base_alias(Alias, Options),
  680    absolute_file_name(Alias, PackDir,
  681                       [ file_type(directory),
  682                         access(write),
  683                         file_errors(fail)
  684                       ]),
  685    !.
  686pack_install_dir(PackDir, Options) :-
  687    pack_create_install_dir(PackDir, Options).
  688
  689base_alias(Alias, Options) :-
  690    option(global(true), Options),
  691    !,
  692    Alias = common_app_data(pack).
  693base_alias(Alias, Options) :-
  694    option(global(false), Options),
  695    !,
  696    Alias = user_app_data(pack).
  697base_alias(Alias, _Options) :-
  698    Alias = pack('.').
  699
  700pack_create_install_dir(PackDir, Options) :-
  701    base_alias(Alias, Options),
  702    findall(Candidate = create_dir(Candidate),
  703            ( absolute_file_name(Alias, Candidate, [solutions(all)]),
  704              \+ exists_file(Candidate),
  705              \+ exists_directory(Candidate),
  706              file_directory_name(Candidate, Super),
  707              (   exists_directory(Super)
  708              ->  access_file(Super, write)
  709              ;   true
  710              )
  711            ),
  712            Candidates0),
  713    list_to_set(Candidates0, Candidates),   % keep order
  714    pack_create_install_dir(Candidates, PackDir, Options).
  715
  716pack_create_install_dir(Candidates, PackDir, Options) :-
  717    Candidates = [Default=_|_],
  718    !,
  719    append(Candidates, [cancel=cancel], Menu),
  720    menu(pack(create_pack_dir), Menu, Default, Selected, Options),
  721    Selected \== cancel,
  722    (   catch(make_directory_path(Selected), E,
  723              (print_message(warning, E), fail))
  724    ->  PackDir = Selected
  725    ;   delete(Candidates, PackDir=create_dir(PackDir), Remaining),
  726        pack_create_install_dir(Remaining, PackDir, Options)
  727    ).
  728pack_create_install_dir(_, _, _) :-
  729    print_message(error, pack(cannot_create_dir(pack(.)))),
  730    fail.

 pack_install(+Pack, +PackDir, +Options)

Install package Pack into PackDir. Options:

url(URL)

Install from the given URL, URL is either a file://, a git URL or a download URL.

upgrade(Boolean)

If Pack is already installed and Boolean is true, update the package to the latest version. If Boolean is false print an error and fail.

  745pack_install(Name, _, Options) :-
  746    current_pack(Name, Dir),
  747    option(upgrade(false), Options, false),
  748    \+ pack_is_in_local_dir(Name, Dir, Options),
  749    print_message(error, pack(already_installed(Name))),
  750    pack_info(Name),
  751    print_message(information, pack(remove_with(Name))),
  752    !,
  753    fail.
  754pack_install(Name, PackDir, Options) :-
  755    option(url(URL), Options),
  756    uri_file_name(URL, Source),
  757    !,
  758    pack_install_from_local(Source, PackDir, Name, Options).
  759pack_install(Name, PackDir, Options) :-
  760    option(url(URL), Options),
  761    uri_components(URL, Components),
  762    uri_data(scheme, Components, Scheme),
  763    pack_install_from_url(Scheme, URL, PackDir, Name, Options).

 pack_install_from_local(+Source, +PackTopDir, +Name, +Options)

Install a package from a local media.

To be done

- Provide an option to install directories using a link (or file-links).

  772pack_install_from_local(Source, PackTopDir, Name, Options) :-
  773    exists_directory(Source),
  774    !,
  775    directory_file_path(PackTopDir, Name, PackDir),
  776    (   option(link(true), Options)
  777    ->  (   same_file(Source, PackDir)
  778        ->  true
  779        ;   atom_concat(PackTopDir, '/', PackTopDirS),
  780            relative_file_name(Source, PackTopDirS, RelPath),
  781            link_file(RelPath, PackDir, symbolic),
  782            assertion(same_file(Source, PackDir))
  783        )
  784    ;   prepare_pack_dir(PackDir, Options),
  785        copy_directory(Source, PackDir)
  786    ),
  787    pack_post_install(Name, PackDir, Options).
  788pack_install_from_local(Source, PackTopDir, Name, Options) :-
  789    exists_file(Source),
  790    directory_file_path(PackTopDir, Name, PackDir),
  791    prepare_pack_dir(PackDir, Options),
  792    pack_unpack(Source, PackDir, Name, Options),
  793    pack_post_install(Name, PackDir, Options).
  794
  795pack_is_in_local_dir(_Pack, PackDir, Options) :-
  796    option(url(DirURL), Options),
  797    uri_file_name(DirURL, Dir),
  798    same_file(PackDir, Dir).

 pack_unpack(+SourceFile, +PackDir, +Pack, +Options)

Unpack an archive to the given package dir.

  805:- if(exists_source(library(archive))).  806pack_unpack(Source, PackDir, Pack, Options) :-
  807    ensure_loaded_archive,
  808    pack_archive_info(Source, Pack, _Info, StripOptions),
  809    prepare_pack_dir(PackDir, Options),
  810    archive_extract(Source, PackDir,
  811                    [ exclude(['._*'])          % MacOS resource forks
  812                    | StripOptions
  813                    ]).
  814:- else.  815pack_unpack(_,_,_,_) :-
  816    existence_error(library, archive).
  817:- endif.  818
  819                 /*******************************
  820                 *             INFO             *
  821                 *******************************/

 pack_archive_info(+Archive, +Pack, -Info, -Strip)

True when Archive archives Pack. Info is unified with the terms from pack.pl in the pack and Strip is the strip-option for archive_extract/3.

Requires library(archive), which is lazily loaded when needed.

Errors

- existence_error(pack_file, 'pack.pl') if the archive doesn't contain pack.pl

- Syntax errors if pack.pl cannot be parsed.

  835:- if(exists_source(library(archive))).  836ensure_loaded_archive :-
  837    current_predicate(archive_open/3),
  838    !.
  839ensure_loaded_archive :-
  840    use_module(library(archive)).
  841
  842pack_archive_info(Archive, Pack, [archive_size(Bytes)|Info], Strip) :-
  843    ensure_loaded_archive,
  844    size_file(Archive, Bytes),
  845    setup_call_cleanup(
  846        archive_open(Archive, Handle, []),
  847        (   repeat,
  848            (   archive_next_header(Handle, InfoFile)
  849            ->  true
  850            ;   !, fail
  851            )
  852        ),
  853        archive_close(Handle)),
  854    file_base_name(InfoFile, 'pack.pl'),
  855    atom_concat(Prefix, 'pack.pl', InfoFile),
  856    strip_option(Prefix, Pack, Strip),
  857    setup_call_cleanup(
  858        archive_open_entry(Handle, Stream),
  859        read_stream_to_terms(Stream, Info),
  860        close(Stream)),
  861    !,
  862    must_be(ground, Info),
  863    maplist(valid_info_term, Info).
  864:- else.  865pack_archive_info(_, _, _, _) :-
  866    existence_error(library, archive).
  867:- endif.  868pack_archive_info(_, _, _, _) :-
  869    existence_error(pack_file, 'pack.pl').
  870
  871strip_option('', _, []) :- !.
  872strip_option('./', _, []) :- !.
  873strip_option(Prefix, Pack, [remove_prefix(Prefix)]) :-
  874    atom_concat(PrefixDir, /, Prefix),
  875    file_base_name(PrefixDir, Base),
  876    (   Base == Pack
  877    ->  true
  878    ;   pack_version_file(Pack, _, Base)
  879    ->  true
  880    ;   \+ sub_atom(PrefixDir, _, _, _, /)
  881    ).
  882
  883read_stream_to_terms(Stream, Terms) :-
  884    read(Stream, Term0),
  885    read_stream_to_terms(Term0, Stream, Terms).
  886
  887read_stream_to_terms(end_of_file, _, []) :- !.
  888read_stream_to_terms(Term0, Stream, [Term0|Terms]) :-
  889    read(Stream, Term1),
  890    read_stream_to_terms(Term1, Stream, Terms).

 pack_git_info(+GitDir, -Hash, -Info) is det

Retrieve info from a cloned git repository that is compatible with pack_archive_info/4.

  898pack_git_info(GitDir, Hash, [git(true), installed_size(Bytes)|Info]) :-
  899    exists_directory(GitDir),
  900    !,
  901    git_ls_tree(Entries, [directory(GitDir)]),
  902    git_hash(Hash, [directory(GitDir)]),
  903    maplist(arg(4), Entries, Sizes),
  904    sum_list(Sizes, Bytes),
  905    directory_file_path(GitDir, 'pack.pl', InfoFile),
  906    read_file_to_terms(InfoFile, Info, [encoding(utf8)]),
  907    must_be(ground, Info),
  908    maplist(valid_info_term, Info).

 download_file_sanity_check(+Archive, +Pack, +Info) is semidet

Perform basic sanity checks on DownloadFile

  914download_file_sanity_check(Archive, Pack, Info) :-
  915    info_field(name(Name), Info),
  916    info_field(version(VersionAtom), Info),
  917    atom_version(VersionAtom, Version),
  918    pack_version_file(PackA, VersionA, Archive),
  919    must_match([Pack, PackA, Name], name),
  920    must_match([Version, VersionA], version).
  921
  922info_field(Field, Info) :-
  923    memberchk(Field, Info),
  924    ground(Field),
  925    !.
  926info_field(Field, _Info) :-
  927    functor(Field, FieldName, _),
  928    print_message(error, pack(missing(FieldName))),
  929    fail.
  930
  931must_match(Values, _Field) :-
  932    sort(Values, [_]),
  933    !.
  934must_match(Values, Field) :-
  935    print_message(error, pack(conflict(Field, Values))),
  936    fail.
  937
  938
  939                 /*******************************
  940                 *         INSTALLATION         *
  941                 *******************************/

 prepare_pack_dir(+Dir, +Options)

Prepare for installing the package into Dir. This

• If the directory exist and is empty, done.
• Else if the directory exists, remove the directory and recreate it. Note that if the directory is a symlink this just deletes the link.
• Else create the directory.

  953prepare_pack_dir(Dir, Options) :-
  954    exists_directory(Dir),
  955    !,
  956    (   empty_directory(Dir)
  957    ->  true
  958    ;   (   option(upgrade(true), Options)
  959        ;   confirm(remove_existing_pack(Dir), yes, Options)
  960        )
  961    ->  delete_directory_and_contents(Dir),
  962        make_directory(Dir)
  963    ).
  964prepare_pack_dir(Dir, _) :-
  965    make_directory(Dir).

 empty_directory(+Directory) is semidet

True if Directory is empty (holds no files or sub-directories).

  971empty_directory(Dir) :-
  972    \+ ( directory_files(Dir, Entries),
  973         member(Entry, Entries),
  974         \+ special(Entry)
  975       ).
  976
  977special(.).
  978special(..).

 pack_install_from_url(+Scheme, +URL, +PackDir, +Pack, +Options)

Install a package from a remote source. For git repositories, we simply clone. Archives are downloaded. We currently use the built-in HTTP client. For complete coverage, we should consider using an external (e.g., curl) if available.

  988pack_install_from_url(_, URL, PackTopDir, Pack, Options) :-
  989    option(git(true), Options),
  990    !,
  991    directory_file_path(PackTopDir, Pack, PackDir),
  992    prepare_pack_dir(PackDir, Options),
  993    run_process(path(git), [clone, URL, PackDir], []),
  994    pack_git_info(PackDir, Hash, Info),
  995    pack_inquiry(URL, git(Hash), Info, Options),
  996    show_info(Pack, Info, Options),
  997    confirm(git_post_install(PackDir, Pack), yes, Options),
  998    pack_post_install(Pack, PackDir, Options).
  999pack_install_from_url(Scheme, URL, PackTopDir, Pack, Options) :-
 1000    download_scheme(Scheme),
 1001    directory_file_path(PackTopDir, Pack, PackDir),
 1002    prepare_pack_dir(PackDir, Options),
 1003    pack_download_dir(PackTopDir, DownLoadDir),
 1004    download_file(URL, Pack, DownloadBase, Options),
 1005    directory_file_path(DownLoadDir, DownloadBase, DownloadFile),
 1006    setup_call_cleanup(
 1007        http_open(URL, In,
 1008                  [ cert_verify_hook(ssl_verify)
 1009                  ]),
 1010        setup_call_cleanup(
 1011            open(DownloadFile, write, Out, [type(binary)]),
 1012            copy_stream_data(In, Out),
 1013            close(Out)),
 1014        close(In)),
 1015    pack_archive_info(DownloadFile, Pack, Info, _),
 1016    download_file_sanity_check(DownloadFile, Pack, Info),
 1017    pack_inquiry(URL, DownloadFile, Info, Options),
 1018    show_info(Pack, Info, Options),
 1019    confirm(install_downloaded(DownloadFile), yes, Options),
 1020    pack_install_from_local(DownloadFile, PackTopDir, Pack, Options).

 download_file(+URL, +Pack, -File, +Options) is det

 1024download_file(URL, Pack, File, Options) :-
 1025    option(version(Version), Options),
 1026    !,
 1027    atom_version(VersionA, Version),
 1028    file_name_extension(_, Ext, URL),
 1029    format(atom(File), '~w-~w.~w', [Pack, VersionA, Ext]).
 1030download_file(URL, Pack, File, _) :-
 1031    file_base_name(URL,Basename),
 1032    no_int_file_name_extension(Tag,Ext,Basename),
 1033    tag_version(Tag,Version),
 1034    !,
 1035    atom_version(VersionA,Version),
 1036    format(atom(File0), '~w-~w', [Pack, VersionA]),
 1037    file_name_extension(File0, Ext, File).
 1038download_file(URL, _, File, _) :-
 1039    file_base_name(URL, File).

 pack_url_file(+URL, -File) is det

True if File is a unique id for the referenced pack and version. Normally, that is simply the base name, but GitHub archives destroy this picture. Needed by the pack manager.

 1047pack_url_file(URL, FileID) :-
 1048    github_release_url(URL, Pack, Version),
 1049    !,
 1050    download_file(URL, Pack, FileID, [version(Version)]).
 1051pack_url_file(URL, FileID) :-
 1052    file_base_name(URL, FileID).
 1053
 1054
 1055:- public ssl_verify/5.

 ssl_verify(+SSL, +ProblemCert, +AllCerts, +FirstCert, +Error)

Currently we accept all certificates. We organise our own security using SHA1 signatures, so we do not care about the source of the data.

 1063ssl_verify(_SSL,
 1064           _ProblemCertificate, _AllCertificates, _FirstCertificate,
 1065           _Error).
 1066
 1067pack_download_dir(PackTopDir, DownLoadDir) :-
 1068    directory_file_path(PackTopDir, 'Downloads', DownLoadDir),
 1069    (   exists_directory(DownLoadDir)
 1070    ->  true
 1071    ;   make_directory(DownLoadDir)
 1072    ),
 1073    (   access_file(DownLoadDir, write)
 1074    ->  true
 1075    ;   permission_error(write, directory, DownLoadDir)
 1076    ).

 download_url(+URL) is det

True if URL looks like a URL we can download from.

 1082download_url(URL) :-
 1083    atom(URL),
 1084    uri_components(URL, Components),
 1085    uri_data(scheme, Components, Scheme),
 1086    download_scheme(Scheme).
 1087
 1088download_scheme(http).
 1089download_scheme(https) :-
 1090    catch(use_module(library(http/http_ssl_plugin)),
 1091          E, (print_message(warning, E), fail)).

 pack_post_install(+Pack, +PackDir, +Options) is det

Process post installation work. Steps:

• Create foreign resources
• Register directory as autoload library
• Attach the package

 1101pack_post_install(Pack, PackDir, Options) :-
 1102    post_install_foreign(Pack, PackDir, Options),
 1103    post_install_autoload(PackDir, Options),
 1104    '$pack_attach'(PackDir).

 pack_rebuild(+Pack) is det

Rebuilt possible foreign components of Pack.

 1110pack_rebuild(Pack) :-
 1111    current_pack(Pack, PackDir),
 1112    !,
 1113    post_install_foreign(Pack, PackDir, [rebuild(true)]).
 1114pack_rebuild(Pack) :-
 1115    unattached_pacth(Pack, PackDir),
 1116    !,
 1117    post_install_foreign(Pack, PackDir, [rebuild(true)]).
 1118pack_rebuild(Pack) :-
 1119    existence_error(pack, Pack).
 1120
 1121unattached_pacth(Pack, BaseDir) :-
 1122    directory_file_path(Pack, 'pack.pl', PackFile),
 1123    absolute_file_name(pack(PackFile), PackPath,
 1124                       [ access(read),
 1125                         file_errors(fail)
 1126                       ]),
 1127    file_directory_name(PackPath, BaseDir).

 pack_rebuild is det

Rebuild foreign components of all packages.

 1133pack_rebuild :-
 1134    forall(current_pack(Pack),
 1135           ( print_message(informational, pack(rebuild(Pack))),
 1136             pack_rebuild(Pack)
 1137           )).

 post_install_foreign(+Pack, +PackDir, +Options) is det

Install foreign parts of the package.

 1144post_install_foreign(Pack, PackDir, Options) :-
 1145    is_foreign_pack(PackDir, _),
 1146    !,
 1147    (   pack_info_term(PackDir, pack_version(Version))
 1148    ->  true
 1149    ;   Version = 1
 1150    ),
 1151    option(rebuild(Rebuild), Options, if_absent),
 1152    (   Rebuild == if_absent,
 1153        foreign_present(PackDir)
 1154    ->  print_message(informational, pack(kept_foreign(Pack)))
 1155    ;   BuildSteps0 = [[dependencies], [configure], build, [test], install],
 1156        (   Rebuild == true
 1157        ->  BuildSteps1 = [distclean|BuildSteps0]
 1158        ;   BuildSteps1 = BuildSteps0
 1159        ),
 1160        (   option(test(false), Options)
 1161        ->  delete(BuildSteps1, [test], BuildSteps)
 1162        ;   BuildSteps = BuildSteps1
 1163        ),
 1164        build_steps(BuildSteps, PackDir, [pack_version(Version)|Options])
 1165    ).
 1166post_install_foreign(_, _, _).

 foreign_present(+PackDir) is semidet

True if we find one or more modules in the pack lib directory for the current architecture. Does not check that these can be loaded, nor whether all required modules are present.

 1175foreign_present(PackDir) :-
 1176    current_prolog_flag(arch, Arch),
 1177    atomic_list_concat([PackDir, '/lib'], ForeignBaseDir),
 1178    exists_directory(ForeignBaseDir),
 1179    !,
 1180    atomic_list_concat([PackDir, '/lib/', Arch], ForeignDir),
 1181    exists_directory(ForeignDir),
 1182    current_prolog_flag(shared_object_extension, Ext),
 1183    atomic_list_concat([ForeignDir, '/*.', Ext], Pattern),
 1184    expand_file_name(Pattern, Files),
 1185    Files \== [].

 is_foreign_pack(+PackDir, -Type) is nondet

True when PackDir contains files that indicate the need for a specific class of build tools indicated by Type.

 1192is_foreign_pack(PackDir, Type) :-
 1193    foreign_file(File, Type),
 1194    directory_file_path(PackDir, File, Path),
 1195    exists_file(Path).
 1196
 1197foreign_file('CMakeLists.txt', cmake).
 1198foreign_file('configure',      configure).
 1199foreign_file('configure.in',   autoconf).
 1200foreign_file('configure.ac',   autoconf).
 1201foreign_file('Makefile.am',    automake).
 1202foreign_file('Makefile',       make).
 1203foreign_file('makefile',       make).
 1204foreign_file('conanfile.txt',  conan).
 1205foreign_file('conanfile.py',   conan).
 1206
 1207
 1208                 /*******************************
 1209                 *           AUTOLOAD           *
 1210                 *******************************/

 post_install_autoload(+PackDir, +Options)

Create an autoload index if the package demands such.

 1216post_install_autoload(PackDir, Options) :-
 1217    option(autoload(true), Options, true),
 1218    pack_info_term(PackDir, autoload(true)),
 1219    !,
 1220    directory_file_path(PackDir, prolog, PrologLibDir),
 1221    make_library_index(PrologLibDir).
 1222post_install_autoload(_, _).
 1223
 1224
 1225                 /*******************************
 1226                 *            UPGRADE           *
 1227                 *******************************/

 pack_upgrade(+Pack) is semidet

Try to upgrade the package Pack.

To be done

- Update dependencies when updating a pack from git?

 1235pack_upgrade(Pack) :-
 1236    pack_info(Pack, _, directory(Dir)),
 1237    directory_file_path(Dir, '.git', GitDir),
 1238    exists_directory(GitDir),
 1239    !,
 1240    print_message(informational, pack(git_fetch(Dir))),
 1241    git([fetch], [ directory(Dir) ]),
 1242    git_describe(V0, [ directory(Dir) ]),
 1243    git_describe(V1, [ directory(Dir), commit('origin/master') ]),
 1244    (   V0 == V1
 1245    ->  print_message(informational, pack(up_to_date(Pack)))
 1246    ;   confirm(upgrade(Pack, V0, V1), yes, []),
 1247        git([merge, 'origin/master'], [ directory(Dir) ]),
 1248        pack_rebuild(Pack)
 1249    ).
 1250pack_upgrade(Pack) :-
 1251    once(pack_info(Pack, _, version(VersionAtom))),
 1252    atom_version(VersionAtom, Version),
 1253    pack_info(Pack, _, download(URL)),
 1254    (   wildcard_pattern(URL)
 1255    ->  true
 1256    ;   github_url(URL, _User, _Repo)
 1257    ),
 1258    !,
 1259    available_download_versions(URL, [Latest-LatestURL|_Versions]),
 1260    (   Latest @> Version
 1261    ->  confirm(upgrade(Pack, Version, Latest), yes, []),
 1262        pack_install(Pack,
 1263                     [ url(LatestURL),
 1264                       upgrade(true),
 1265                       pack(Pack)
 1266                     ])
 1267    ;   print_message(informational, pack(up_to_date(Pack)))
 1268    ).
 1269pack_upgrade(Pack) :-
 1270    print_message(warning, pack(no_upgrade_info(Pack))).
 1271
 1272
 1273                 /*******************************
 1274                 *            REMOVE            *
 1275                 *******************************/

 pack_remove(+Name) is det

Remove the indicated package.

 1281pack_remove(Pack) :-
 1282    update_dependency_db,
 1283    (   setof(Dep, pack_depends_on(Dep, Pack), Deps)
 1284    ->  confirm_remove(Pack, Deps, Delete),
 1285        forall(member(P, Delete), pack_remove_forced(P))
 1286    ;   pack_remove_forced(Pack)
 1287    ).
 1288
 1289pack_remove_forced(Pack) :-
 1290    catch('$pack_detach'(Pack, BaseDir),
 1291          error(existence_error(pack, Pack), _),
 1292          fail),
 1293    !,
 1294    print_message(informational, pack(remove(BaseDir))),
 1295    delete_directory_and_contents(BaseDir).
 1296pack_remove_forced(Pack) :-
 1297    unattached_pacth(Pack, BaseDir),
 1298    !,
 1299    delete_directory_and_contents(BaseDir).
 1300pack_remove_forced(Pack) :-
 1301    print_message(informational, error(existence_error(pack, Pack),_)).
 1302
 1303confirm_remove(Pack, Deps, Delete) :-
 1304    print_message(warning, pack(depends(Pack, Deps))),
 1305    menu(pack(resolve_remove),
 1306         [ [Pack]      = remove_only(Pack),
 1307           [Pack|Deps] = remove_deps(Pack, Deps),
 1308           []          = cancel
 1309         ], [], Delete, []),
 1310    Delete \== [].
 1311
 1312
 1313                 /*******************************
 1314                 *           PROPERTIES         *
 1315                 *******************************/

 pack_property(?Pack, ?Property) is nondet

True when Property is a property of an installed Pack. This interface is intended for programs that wish to interact with the package manager. Defined properties are:

directory(Directory)

Directory into which the package is installed

version(Version)

Installed version

title(Title)

Full title of the package

author(Author)

Registered author

download(URL)

Official download URL

readme(File)

Package README file (if present)

todo(File)

Package TODO file (if present)

 1338pack_property(Pack, Property) :-
 1339    findall(Pack-Property, pack_property_(Pack, Property), List),
 1340    member(Pack-Property, List).            % make det if applicable
 1341
 1342pack_property_(Pack, Property) :-
 1343    pack_info(Pack, _, Property).
 1344pack_property_(Pack, Property) :-
 1345    \+ \+ info_file(Property, _),
 1346    '$pack':pack(Pack, BaseDir),
 1347    access_file(BaseDir, read),
 1348    directory_files(BaseDir, Files),
 1349    member(File, Files),
 1350    info_file(Property, Pattern),
 1351    downcase_atom(File, Pattern),
 1352    directory_file_path(BaseDir, File, InfoFile),
 1353    arg(1, Property, InfoFile).
 1354
 1355info_file(readme(_), 'readme.txt').
 1356info_file(readme(_), 'readme').
 1357info_file(todo(_),   'todo.txt').
 1358info_file(todo(_),   'todo').
 1359
 1360
 1361                 /*******************************
 1362                 *             GIT              *
 1363                 *******************************/

 git_url(+URL, -Pack) is semidet

True if URL describes a git url for Pack

 1369git_url(URL, Pack) :-
 1370    uri_components(URL, Components),
 1371    uri_data(scheme, Components, Scheme),
 1372    uri_data(path, Components, Path),
 1373    (   Scheme == git
 1374    ->  true
 1375    ;   git_download_scheme(Scheme),
 1376        file_name_extension(_, git, Path)
 1377    ),
 1378    file_base_name(Path, PackExt),
 1379    (   file_name_extension(Pack, git, PackExt)
 1380    ->  true
 1381    ;   Pack = PackExt
 1382    ),
 1383    (   safe_pack_name(Pack)
 1384    ->  true
 1385    ;   domain_error(pack_name, Pack)
 1386    ).
 1387
 1388git_download_scheme(http).
 1389git_download_scheme(https).

 safe_pack_name(+Name:atom) is semidet

Verifies that Name is a valid pack name. This avoids trickery with pack file names to make shell commands behave unexpectly.

 1396safe_pack_name(Name) :-
 1397    atom_length(Name, Len),
 1398    Len >= 3,                               % demand at least three length
 1399    atom_codes(Name, Codes),
 1400    maplist(safe_pack_char, Codes),
 1401    !.
 1402
 1403safe_pack_char(C) :- between(0'a, 0'z, C), !.
 1404safe_pack_char(C) :- between(0'A, 0'Z, C), !.
 1405safe_pack_char(C) :- between(0'0, 0'9, C), !.
 1406safe_pack_char(0'_).
 1407
 1408
 1409                 /*******************************
 1410                 *         VERSION LOGIC        *
 1411                 *******************************/

 pack_version_file(-Pack, -Version, +File) is semidet

True if File is the name of a file or URL of a file that contains Pack at Version. File must have an extension and the basename must be of the form <pack>-<n>{.<m>}*. E.g., mypack-1.5.

 1420pack_version_file(Pack, Version, GitHubRelease) :-
 1421    atomic(GitHubRelease),
 1422    github_release_url(GitHubRelease, Pack, Version),
 1423    !.
 1424pack_version_file(Pack, Version, Path) :-
 1425    atomic(Path),
 1426    file_base_name(Path, File),
 1427    no_int_file_name_extension(Base, _Ext, File),
 1428    atom_codes(Base, Codes),
 1429    (   phrase(pack_version(Pack, Version), Codes),
 1430        safe_pack_name(Pack)
 1431    ->  true
 1432    ).
 1433
 1434no_int_file_name_extension(Base, Ext, File) :-
 1435    file_name_extension(Base0, Ext0, File),
 1436    \+ atom_number(Ext0, _),
 1437    !,
 1438    Base = Base0,
 1439    Ext = Ext0.
 1440no_int_file_name_extension(File, '', File).

 github_release_url(+URL, -Pack, -Version) is semidet

True when URL is the URL of a GitHub release. Such releases are accessible as

https:/github.com/<owner>/<pack>/archive/[vV]?<version>.zip'

 1453github_release_url(URL, Pack, Version) :-
 1454    uri_components(URL, Components),
 1455    uri_data(authority, Components, 'github.com'),
 1456    uri_data(scheme, Components, Scheme),
 1457    download_scheme(Scheme),
 1458    uri_data(path, Components, Path),
 1459    atomic_list_concat(['',_Project,Pack,archive,File], /, Path),
 1460    file_name_extension(Tag, Ext, File),
 1461    github_archive_extension(Ext),
 1462    tag_version(Tag, Version),
 1463    !.
 1464
 1465github_archive_extension(tgz).
 1466github_archive_extension(zip).
 1467
 1468tag_version(Tag, Version) :-
 1469    version_tag_prefix(Prefix),
 1470    atom_concat(Prefix, AtomVersion, Tag),
 1471    atom_version(AtomVersion, Version).
 1472
 1473version_tag_prefix(v).
 1474version_tag_prefix('V').
 1475version_tag_prefix('').
 1476
 1477
 1478:- public
 1479    atom_version/2.

 atom_version(?Atom, ?Version)

Translate between atomic version representation and term representation. The term representation is a list of version components as integers and can be compared using @>

 1487atom_version(Atom, version(Parts)) :-
 1488    (   atom(Atom)
 1489    ->  atom_codes(Atom, Codes),
 1490        phrase(version(Parts), Codes)
 1491    ;   atomic_list_concat(Parts, '.', Atom)
 1492    ).
 1493
 1494pack_version(Pack, version(Parts)) -->
 1495    string(Codes), "-",
 1496    version(Parts),
 1497    !,
 1498    { atom_codes(Pack, Codes)
 1499    }.
 1500
 1501version([_|T]) -->
 1502    "*",
 1503    !,
 1504    (   "."
 1505    ->  version(T)
 1506    ;   []
 1507    ).
 1508version([H|T]) -->
 1509    integer(H),
 1510    (   "."
 1511    ->  version(T)
 1512    ;   { T = [] }
 1513    ).
 1514
 1515                 /*******************************
 1516                 *       QUERY CENTRAL DB       *
 1517                 *******************************/

 pack_inquiry(+URL, +DownloadFile, +Info, +Options) is semidet

Query the status of a package with the central repository. To do this, we POST a Prolog document containing the URL, info and the SHA1 hash to http://www.swi-prolog.org/pack/eval. The server replies using a list of Prolog terms, described below. The only member that is always included is downloads (with default value 0).

alt_hash(Count, URLs, Hash)

A file with the same base-name, but a different hash was found at URLs and downloaded Count times.

downloads(Count)

Number of times a file with this hash was downloaded.

rating(VoteCount, Rating)

User rating (1..5), provided based on VoteCount votes.

dependency(Token, Pack, Version, URLs, SubDeps)

Required tokens can be provided by the given provides.

 1537pack_inquiry(_, _, _, Options) :-
 1538    option(inquiry(false), Options),
 1539    !.
 1540pack_inquiry(URL, DownloadFile, Info, Options) :-
 1541    setting(server, ServerBase),
 1542    ServerBase \== '',
 1543    atom_concat(ServerBase, query, Server),
 1544    (   option(inquiry(true), Options)
 1545    ->  true
 1546    ;   confirm(inquiry(Server), yes, Options)
 1547    ),
 1548    !,
 1549    (   DownloadFile = git(SHA1)
 1550    ->  true
 1551    ;   file_sha1(DownloadFile, SHA1)
 1552    ),
 1553    query_pack_server(install(URL, SHA1, Info), Reply, Options),
 1554    inquiry_result(Reply, URL, Options).
 1555pack_inquiry(_, _, _, _).

 query_pack_server(+Query, -Result, +Options)

Send a Prolog query to the package server and process its results.

 1563query_pack_server(Query, Result, Options) :-
 1564    setting(server, ServerBase),
 1565    ServerBase \== '',
 1566    atom_concat(ServerBase, query, Server),
 1567    format(codes(Data), '~q.~n', Query),
 1568    info_level(Informational, Options),
 1569    print_message(Informational, pack(contacting_server(Server))),
 1570    setup_call_cleanup(
 1571        http_open(Server, In,
 1572                  [ post(codes(application/'x-prolog', Data)),
 1573                    header(content_type, ContentType)
 1574                  ]),
 1575        read_reply(ContentType, In, Result),
 1576        close(In)),
 1577    message_severity(Result, Level, Informational),
 1578    print_message(Level, pack(server_reply(Result))).
 1579
 1580read_reply(ContentType, In, Result) :-
 1581    sub_atom(ContentType, 0, _, _, 'application/x-prolog'),
 1582    !,
 1583    set_stream(In, encoding(utf8)),
 1584    read(In, Result).
 1585read_reply(ContentType, In, _Result) :-
 1586    read_string(In, 500, String),
 1587    print_message(error, pack(no_prolog_response(ContentType, String))),
 1588    fail.
 1589
 1590info_level(Level, Options) :-
 1591    option(silent(true), Options),
 1592    !,
 1593    Level = silent.
 1594info_level(informational, _).
 1595
 1596message_severity(true(_), Informational, Informational).
 1597message_severity(false, warning, _).
 1598message_severity(exception(_), error, _).

 inquiry_result(+Reply, +File, +Options) is semidet

Analyse the results of the inquiry and decide whether to continue or not.

 1606inquiry_result(Reply, File, Options) :-
 1607    findall(Eval, eval_inquiry(Reply, File, Eval, Options), Evaluation),
 1608    \+ member(cancel, Evaluation),
 1609    select_option(git(_), Options, Options1, _),
 1610    forall(member(install_dependencies(Resolution), Evaluation),
 1611           maplist(install_dependency(Options1), Resolution)).
 1612
 1613eval_inquiry(true(Reply), URL, Eval, _) :-
 1614    include(alt_hash, Reply, Alts),
 1615    Alts \== [],
 1616    print_message(warning, pack(alt_hashes(URL, Alts))),
 1617    (   memberchk(downloads(Count), Reply),
 1618        (   git_url(URL, _)
 1619        ->  Default = yes,
 1620            Eval = with_git_commits_in_same_version
 1621        ;   Default = no,
 1622            Eval = with_alt_hashes
 1623        ),
 1624        confirm(continue_with_alt_hashes(Count, URL), Default, [])
 1625    ->  true
 1626    ;   !,                          % Stop other rules
 1627        Eval = cancel
 1628    ).
 1629eval_inquiry(true(Reply), _, Eval, Options) :-
 1630    include(dependency, Reply, Deps),
 1631    Deps \== [],
 1632    select_dependency_resolution(Deps, Eval, Options),
 1633    (   Eval == cancel
 1634    ->  !
 1635    ;   true
 1636    ).
 1637eval_inquiry(true(Reply), URL, true, Options) :-
 1638    file_base_name(URL, File),
 1639    info_level(Informational, Options),
 1640    print_message(Informational, pack(inquiry_ok(Reply, File))).
 1641eval_inquiry(exception(pack(modified_hash(_SHA1-URL, _SHA2-[URL]))),
 1642             URL, Eval, Options) :-
 1643    (   confirm(continue_with_modified_hash(URL), no, Options)
 1644    ->  Eval = true
 1645    ;   Eval = cancel
 1646    ).
 1647
 1648alt_hash(alt_hash(_,_,_)).
 1649dependency(dependency(_,_,_,_,_)).

 select_dependency_resolution(+Deps, -Eval, +Options)

Select a resolution.

To be done

- Exploit backtracking over resolve_dependencies/2.

 1658select_dependency_resolution(Deps, Eval, Options) :-
 1659    resolve_dependencies(Deps, Resolution),
 1660    exclude(local_dep, Resolution, ToBeDone),
 1661    (   ToBeDone == []
 1662    ->  !, Eval = true
 1663    ;   print_message(warning, pack(install_dependencies(Resolution))),
 1664        (   memberchk(_-unresolved, Resolution)
 1665        ->  Default = cancel
 1666        ;   Default = install_deps
 1667        ),
 1668        menu(pack(resolve_deps),
 1669             [ install_deps    = install_deps,
 1670               install_no_deps = install_no_deps,
 1671               cancel          = cancel
 1672             ], Default, Choice, Options),
 1673        (   Choice == cancel
 1674        ->  !, Eval = cancel
 1675        ;   Choice == install_no_deps
 1676        ->  !, Eval = install_no_deps
 1677        ;   !, Eval = install_dependencies(Resolution)
 1678        )
 1679    ).
 1680
 1681local_dep(_-resolved(_)).

 install_dependency(+Options, +TokenResolution)

Install dependencies for the given resolution.

To be done

- : Query URI to use

 1690install_dependency(Options,
 1691                   _Token-resolve(Pack, VersionAtom, [_URL|_], SubResolve)) :-
 1692    atom_version(VersionAtom, Version),
 1693    current_pack(Pack),
 1694    pack_info(Pack, _, version(InstalledAtom)),
 1695    atom_version(InstalledAtom, Installed),
 1696    Installed == Version,               % already installed
 1697    !,
 1698    maplist(install_dependency(Options), SubResolve).
 1699install_dependency(Options,
 1700                   _Token-resolve(Pack, VersionAtom, [URL|_], SubResolve)) :-
 1701    !,
 1702    atom_version(VersionAtom, Version),
 1703    merge_options([ url(URL),
 1704                    version(Version),
 1705                    interactive(false),
 1706                    inquiry(false),
 1707                    info(list),
 1708                    pack(Pack)
 1709                  ], Options, InstallOptions),
 1710    pack_install(Pack, InstallOptions),
 1711    maplist(install_dependency(Options), SubResolve).
 1712install_dependency(_, _-_).
 1713
 1714
 1715                 /*******************************
 1716                 *        WILDCARD URIs         *
 1717                 *******************************/