604 lines
20 KiB
Prolog
Executable File
604 lines
20 KiB
Prolog
Executable File
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2014 *
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* *
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*************************************************************************/
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/**
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@file absf.yap
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@defgroup abs_file_name File Name Resolution
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Support for file name resolution through absolute_file_name/3 and
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friends. These utility built-ins describe a list of directories that
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are used by load_files/2 to search. They include pre-compiled paths
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plus user-defined directories, directories based on environment
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variables and registry information to search for files.
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@{
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*/
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:- system_module( absolute_file_name, [absolute_file_name/2,
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absolute_file_name/3,
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add_to_path/1,
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add_to_path/2,
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path/1,
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remove_from_path/1], ['$full_filename'/3,
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'$system_library_directories'/2]).
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:- use_system_module( '$_boot', ['$system_catch'/4]).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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:- use_system_module( '$_lists', [member/2]).
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/**
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absolute_file_name(+File:atom, +Options:list, +Path:atom) is nondet
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absolute_file_name(-File:atom, +Path:atom, +Options:list) is nondet
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_Options_ is a list of options to guide the conversion:
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- extensions(+ _ListOfExtensions_)
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List of file-extensions to try. Default is `''`. For each
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extension, absolute_file_name/3 will first add the extension and then
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verify the conditions imposed by the other options. If the condition
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fails, the next extension of the list is tried. Extensions may be
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specified both with dot, as `.ext`, or without, as plain `ext`.
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- relative_to(+ _FileOrDir_ )
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Resolve the path relative to the given directory or directory the
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holding the given file. Without this option, paths are resolved
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relative to the working directory (see working_directory/2) or,
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if _Spec_ is atomic and absolute_file_name/3 is executed
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in a directive, it uses the current source-file as reference.
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- access(+ _Mode_ )
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Imposes the condition access_file( _File_ , _Mode_ ). _Mode_ is one of `read`, `write`, `append`, `exist` or
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`none` (default).
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See also access_file/2.
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- file_type(+ _Type_ )
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Defines suffixes matching one of several pre-specified type of files. Default mapping is as follows:
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1. `txt` implies `[ '' ]`,
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2. `prolog` implies `['.yap', '.pl', '.prolog', '']`,
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3. `executable` implies `['.so', ',dylib', '.dll']` depending on the Operating system,
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4. `qlf` implies `['.qlf', '']`,
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5. `directory` implies `['']`,
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6. The file-type `source` is an alias for `prolog` designed to support compatibility with SICStus Prolog. See also prolog_file_type/2.
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Notice that this predicate only
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returns non-directories, unless the option `file_type(directory)` is
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specified, or unless `access(none)`.
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- file_errors(`fail`/`error`)
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If `error` (default), throw and `existence_error` exception
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if the file cannot be found. If `fail`, stay silent.
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- solutions(`first`/`all`)
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If `first` (default), the search cannot backtrack. leaves no choice-point.
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Otherwise a choice-point will be left and backtracking may yield
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more solutions.
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- expand(`true`/`false`)
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If `true` (default is `false`) and _Spec_ is atomic,
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call expand_file_name/2 followed by member/2 on _Spec_ before
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proceeding. This is originally a SWI-Prolog extension.
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Compatibility considerations to common argument-order in ISO as well
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as SICStus absolute_file_name/3 forced us to be flexible here.
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If the last argument is a list and the second not, the arguments are
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swapped, making the call
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~~~~~~~~~~~prolog
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absolute_file_name(+ _Spec_ , - _Path_ ,+ _Options_ )
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~~~~~~~~~~~
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valid as well.
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*/
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absolute_file_name(File,TrueFileName,Opts) :- ( var(TrueFileName) ->
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true ; atom(TrueFileName), TrueFileName \= [] ), !,
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absolute_file_name(File,Opts,TrueFileName).
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absolute_file_name(File,Opts,TrueFileName) :-
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'$absolute_file_name'(File,Opts,TrueFileName,absolute_file_name(File,Opts,TrueFileName)).
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/**
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absolute_file_name(+Name:atom,+Path:atom) is nondet
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Converts the given file specification into an absolute path, using default options. See absolute_file_name/3 for details on the options.
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*/
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absolute_file_name(V,Out) :- var(V), !, % absolute_file_name needs commenting.
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'$do_error'(instantiation_error, absolute_file_name(V, Out)).
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absolute_file_name(user,user) :- !.
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absolute_file_name(File0,File) :-
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'$absolute_file_name'(File0,[access(none),file_type(txt),file_errors(fail),solutions(first)],File,absolute_file_name(File0,File)).
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'$full_filename'(F0,F,G) :-
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'$absolute_file_name'(F0,[access(read),file_type(source),file_errors(fail),solutions(first),expand(true)],F,G).
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'$absolute_file_name'(File, _Opts, _TrueFileName, G) :- var(File), !,
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'$do_error'(instantiation_error, G).
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'$absolute_file_name'(File,Opts,TrueFileName, G) :-
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'$process_fn_opts'(Opts,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G),
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/* our own local findall */
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nb:nb_queue(Ref),
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(
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'$find_in_path'(File,opts(Extensions,RelTo,Type,Access,FErrors,Expand,Debug),TrueFileName,G),
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nb:nb_queue_enqueue(Ref, TrueFileName),
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fail
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;
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nb:nb_queue_close(Ref, FileNames, [])
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),
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'$absolute_file_names'(Solutions, FileNames, FErrors, TrueFileName, File, G).
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'$absolute_file_names'(_Solutions, [], error, _, File, G) :- !,
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'$do_error'(existence_error(file,File),G).
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'$absolute_file_names'(Solutions, FileNames, _, TrueFileName, _, _) :-
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lists:member(TrueFileName, FileNames),
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(Solutions == first -> ! ; true).
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'$process_fn_opts'(V,_,_,_,_,_,_,_,_,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$process_fn_opts'([],[],_,txt,none,error,first,false,false,_) :- !.
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'$process_fn_opts'([Opt|Opts],Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
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'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions0,RelTo0,Type0,Access0,FErrors0,Solutions0,Expand0,Debug0,G),
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'$process_fn_opts'(Opts,Extensions0,RelTo0,Type0,Access0,FErrors0,Solutions0,Expand0,Debug0,G).
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'$process_fn_opts'(Opts,_Extensions,_RelTo,_Type,_Access,_FErrors,_Solutions,_Expand,_Debug,G) :- !,
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'$do_error'(type_error(list,Opts),G).
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'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- var(Opt), !,
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'$do_error'(instantiation_error, G).
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'$process_fn_opt'(extensions(Extensions),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,_,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
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'$check_fn_extensions'(Extensions,G).
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'$process_fn_opt'(relative_to(RelTo),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,_,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
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'$check_atom'(RelTo,G).
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'$process_fn_opt'(access(Access),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,_,FErrors,Solutions,Expand,Debug,G) :- !,
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'$check_atom'(Access,G).
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'$process_fn_opt'(file_type(Type),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,_,Access,FErrors,Solutions,Expand,Debug,G) :- !,
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'$check_fn_type'(Type,G).
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'$process_fn_opt'(file_errors(FErrors),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,_,Solutions,Expand,Debug,G) :- !,
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'$check_fn_errors'(FErrors,G).
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'$process_fn_opt'(solutions(Solutions),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,_,Expand,Debug,G) :- !,
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'$check_fn_solutions'(Solutions,G).
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'$process_fn_opt'(expand(Expand),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,_,Debug,G) :- !,
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'$check_true_false'(Expand,G).
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'$process_fn_opt'(verbose_file_search(Debug),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,_,G) :- !,
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'$check_true_false'(Debug,G).
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'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
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'$do_error'(domain_error(file_name_option,Opt),G).
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'$check_fn_extensions'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_fn_extensions'([],_) :- !.
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'$check_fn_extensions'([A|L],G) :- !,
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'$check_atom'(A,G),
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'$check_fn_extensions'(L,G).
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'$check_fn_extensions'(T,G) :- !,
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'$do_error'(type_error(list,T),G).
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'$check_atom'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_atom'(A,_G) :- atom(A), !.
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'$check_atom'(T,G) :- !,
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'$do_error'(type_error(atom,T),G).
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'$check_fn_type'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_fn_type'(txt,_) :- !.
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'$check_fn_type'(prolog,_) :- !.
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'$check_fn_type'(source,_) :- !.
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'$check_fn_type'(executable,_) :- !.
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'$check_fn_type'(qlf,_) :- !.
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'$check_fn_type'(directory,_) :- !.
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'$check_fn_type'(T,G) :- atom(T), !,
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'$do_error'(domain_error(file_type,T),G).
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'$check_fn_type'(T,G) :- !,
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'$do_error'(type_error(atom,T),G).
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'$check_fn_errors'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_fn_errors'(fail,_) :- !.
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'$check_fn_errors'(error,_) :- !.
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'$check_fn_errors'(T,G) :- atom(T), !,
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'$do_error'(domain_error(file_errors,T),G).
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'$check_fn_errors'(T,G) :- !,
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'$do_error'(type_error(atom,T),G).
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'$check_fn_solutions'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_fn_solutions'(first,_) :- !.
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'$check_fn_solutions'(all,_) :- !.
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'$check_fn_solutions'(T,G) :- atom(T), !,
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'$do_error'(domain_error(solutions,T),G).
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'$check_fn_solutions'(T,G) :- !,
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'$do_error'(type_error(atom,T),G).
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'$check_true_false'(V,G) :- var(V), !,
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'$do_error'(instantiation_error, G).
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'$check_true_false'(true,_) :- !.
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'$check_true_false'(false,_) :- !.
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'$check_true_false'(T,G) :- atom(T), !,
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'$do_error'(domain_error(boolean,T),G).
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'$check_true_false'(T,G) :- !,
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'$do_error'(type_error(atom,T),G).
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% This sequence must be followed:
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% user and user_input are special;
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% library(F) must check library_directories
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% T(F) must check file_search_path
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% all must try search in path
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'$find_in_path'(user,_,user_input, _) :- !.
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'$find_in_path'(user_input,_,user_input, _) :- !.
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'$find_in_path'(S, Opts, NewFile, Call) :-
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S =.. [Name,File0],
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'$cat_file_name'(File0,File), !,
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'$dir_separator'(D),
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atom_codes(A,[D]),
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'$extend_path_directory'(Name, A, File, Opts, NewFile, Call).
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'$find_in_path'(File0,Opts,NewFile,_) :-
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'$cat_file_name'(File0,File), !,
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'$add_path'(File,PFile),
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'$get_abs_file'(PFile,Opts,AbsFile),
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'$search_in_path'(AbsFile,Opts,NewFile).
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'$find_in_path'(File,_,_,Call) :-
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'$do_error'(domain_error(source_sink,File),Call).
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% allow paths in File Name
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'$cat_file_name'(File0,File) :-
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atom(File0), !,
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File = File0.
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'$cat_file_name'(Atoms, File) :-
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'$to_list_of_atoms'(Atoms, List, []),
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atom_concat(List, File).
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'$to_list_of_atoms'(V, _, _) :- var(V), !, fail.
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'$to_list_of_atoms'(Atom, [Atom|L], L) :- atom(Atom), !.
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'$to_list_of_atoms'(Atoms, L1, LF) :-
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Atoms =.. [A,As,Bs],
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atom_codes(A,[D]),
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'$dir_separator'(D),
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'$to_list_of_atoms'(As, L1, [A|L2]),
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'$to_list_of_atoms'(Bs, L2, LF).
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'$get_abs_file'(File,opts(_,RelTo,_,_,_,Expand,_),AbsFile) :-
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'$swi_current_prolog_flag'(file_name_variables, OldF),
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'$swi_set_prolog_flag'(file_name_variables, Expand),
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(
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'$absolute_file_name'(File,ExpFile)
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->
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'$swi_set_prolog_flag'(file_name_variables, OldF)
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;
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'$swi_set_prolog_flag'(file_name_variables, OldF),
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fail
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),
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(
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nonvar(RelTo)
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->
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( is_absolute_file_name(ExpFile) ->
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AbsFile = ExpFile
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;
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'$dir_separator'(D),
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atom_codes(DA,[D]),
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atom_concat([RelTo, DA, ExpFile], AbsFile)
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)
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;
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AbsFile = ExpFile
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).
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'$search_in_path'(File,opts(Extensions,_,Type,Access,_,_,_),F) :-
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'$add_extensions'(Extensions, File, F0),
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'$check_file'(F0, Type, Access, F).
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'$search_in_path'(File,opts(_,_,Type,Access,_,_,_),F) :-
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'$add_type_extensions'(Type, File, F0),
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'$check_file'(F0, Type, Access, F).
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'$check_file'(F, _Type, none, F) :- !.
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'$check_file'(F0, Type, Access, F0) :-
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access_file(F0, Access),
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(Type == directory ->
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exists_directory(F0)
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;
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\+ exists_directory(F0) % if it has a type cannot be a directory.
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).
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'$add_extensions'([Ext|_],File,F) :-
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'$mk_sure_true_ext'(Ext,NExt),
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atom_concat([File,NExt],F).
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'$add_extensions'([_|Extensions],File,F) :-
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'$add_extensions'(Extensions,File,F).
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'$mk_sure_true_ext'(Ext,NExt) :-
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atom_codes(Ext,[C|L]),
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C \= 0'.,
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!,
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atom_codes(NExt,[0'.,C|L]).
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'$mk_sure_true_ext'(Ext,Ext).
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'$add_type_extensions'(Type,File,F) :-
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( Type == source -> NType = prolog ; NType = Type ),
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user:prolog_file_type(Ext, NType),
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atom_concat([File,'.',Ext],F).
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'$add_type_extensions'(_,File,File).
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'$add_path'(File,File) :-
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'$dir_separator'(D),
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atom_codes(DA,[D]),
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sub_atom(File, 0, 1, _, DA), !.
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'$add_path'(File,File).
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'$add_path'(File,PFile) :-
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recorded('$path',Path,_),
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atom_concat([Path,File],PFile).
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'$system_library_directories'(library, Dir) :-
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getenv('YAPSHAREDIR', Dirs),
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'$split_by_sep'(0, 0, Dirs, Dir).
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'$system_library_directories'(foreign, Dir) :-
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getenv('YAPLIBDIR', Dirs),
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'$split_by_sep'(0, 0, Dirs, Dir).
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'$system_library_directories'(commons, Dir) :-
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getenv('YAPCOMMONSDIR', Dirs),
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'$split_by_sep'(0, 0, Dirs, Dir).
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% windows has stuff installed in the registry
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'$system_library_directories'(Library, Dir) :-
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'$swi_current_prolog_flag'(windows, true),
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( (
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'$swi_current_prolog_flag'(address_bits, 64) ->
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( HKEY='HKEY_LOCAL_MACHINE/Software/YAP/Prolog64';
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HKEY='HKEY_CURRENT_USER/Software/YAP/Prolog64' )
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;
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( HKEY='HKEY_LOCAL_MACHINE/Software/YAP/Prolog';
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HKEY='HKEY_CURRENT_USER/Software/YAP/Prolog' )
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), % do not use once/1
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% sanity check: are we running the binary mentioned in the registry?
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'$system_catch'(win_registry_get_value(HKEY,'bin', Bin), prolog,_,fail) ) -> true,
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'$swi_current_prolog_flag'(executable, Bin1),
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same_file(Bin, Bin1),
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'$system_catch'(win_registry_get_value(HKEY, Library, Dir), prolog,_,fail).
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% not installed on registry
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'$system_library_directories'(Library, Dir) :-
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'$yap_paths'(_DLLs, ODir1, OBinDir ),
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% '$absolute_file_name'( OBinDir, BinDir ),
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% '$swi_current_prolog_flag'(executable, Bin1),
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% prolog_to_os_filename( Bin2, Bin1 ),
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% file_directory_name( Bin2, BinDir1 ),
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% same_file( BinDir, BinDir1 ),
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( Library == library ->
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atom_concat( ODir1, '/Yap' , ODir )
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;
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atom_concat( ODir1, '/PrologCommons' , ODir )
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),
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'$absolute_file_name'( ODir, Dir ),
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exists_directory( Dir ), !.
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% desperation: let's check the executable directory
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'$system_library_directories'(Library, Dir) :-
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'$swi_current_prolog_flag'(executable, Bin1),
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prolog_to_os_filename( Bin2, Bin1 ),
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file_directory_name( Bin2, Dir1 ),
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( Library == library ->
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atom_concat( Dir1, '../share/Yap' , Dir )
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;
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atom_concat( Dir1, '../share/PrologCommons' , Dir )
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),
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exists_directory( Dir ), !.
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'$split_by_sep'(Start, Next, Dirs, Dir) :-
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'$swi_current_prolog_flag'(windows, true),
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'$split_by_sep'(Start, Next, Dirs, ';', Dir), !.
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'$split_by_sep'(Start, Next, Dirs, Dir) :-
|
|
'$split_by_sep'(Start, Next, Dirs, ':', Dir).
|
|
|
|
'$split_by_sep'(Start, Next, Dirs, Sep, Dir) :-
|
|
sub_atom(Dirs, Next, 1, _, Let), !,
|
|
'$continue_split_by_sep'(Let, Start, Next, Dirs, Sep, Dir).
|
|
'$split_by_sep'(Start, Next, Dirs, _Sep, Dir) :-
|
|
Next > Start,
|
|
Len is Next-Start,
|
|
sub_atom(Dirs, Start, Len, _, Dir).
|
|
|
|
|
|
% closed a directory
|
|
'$continue_split_by_sep'(Sep, Start, Next, Dirs, Sep, Dir) :-
|
|
Sz is Next-Start,
|
|
Sz > 0,
|
|
sub_atom(Dirs, Start, Sz, _, Dir).
|
|
% next dir
|
|
'$continue_split_by_sep'(Sep , _Start, Next, Dirs, Sep, Dir) :- !,
|
|
N1 is Next+1,
|
|
'$split_by_sep'(N1, N1, Dirs, Dir).
|
|
% same dir
|
|
'$continue_split_by_sep'(_Let, Start, Next, Dirs, Sep, Dir) :-
|
|
N1 is Next+1,
|
|
'$split_by_sep'(Start, N1, Dirs, Sep, Dir).
|
|
|
|
|
|
'$extend_path_directory'(_Name, D, File, _Opts, File, Call) :-
|
|
is_absolute_file_name(File), !.
|
|
'$extend_path_directory'(Name, D, File, Opts, NewFile, Call) :-
|
|
user:file_search_path(Name, IDirs),
|
|
( atom(IDirs) ->
|
|
'$split_by_sep'(0, 0, IDirs, Dir)
|
|
;
|
|
Dir = IDirs
|
|
),
|
|
'$extend_pathd'(Dir, D, File, Opts, NewFile, Call).
|
|
|
|
'$extend_pathd'(Dir, A, File, Opts, NewFile, Goal) :-
|
|
atom(Dir), !,
|
|
'$add_file_to_dir'(Dir,A,File,NFile),
|
|
'$find_in_path'(NFile, Opts, NewFile, Goal), !.
|
|
'$extend_pathd'(Name, A, File, Opts, OFile, Goal) :-
|
|
nonvar(Name),
|
|
Name =.. [N,P0],
|
|
'$add_file_to_dir'(P0,A,File,NFile),
|
|
NewName =.. [N,NFile],
|
|
'$find_in_path'(NewName, Opts, OFile, Goal).
|
|
|
|
'$add_file_to_dir'(P0,A,Atoms,NFile) :-
|
|
atom_concat([P0,A,Atoms],NFile).
|
|
|
|
/**
|
|
path(-Directories:list) is det,deprecated
|
|
|
|
YAP specific procedure that returns a list of user-defined directories
|
|
in the library search-path.
|
|
*/
|
|
path(Path) :- findall(X,'$in_path'(X),Path).
|
|
|
|
'$in_path'(X) :- recorded('$path',Path,_),
|
|
atom_codes(Path,S),
|
|
( S = "" -> X = '.' ;
|
|
atom_codes(X,S) ).
|
|
|
|
/**
|
|
add_to_path(+Directory:atom) is det,deprecated
|
|
|
|
YAP-specific predicate to include directory in library search path.
|
|
*/
|
|
add_to_path(New) :- add_to_path(New,last).
|
|
|
|
/**
|
|
add_to_path(+Directory:atom, +Position:atom) is det,deprecated
|
|
|
|
YAP-specific predicate to include directory in front or back of library search path.
|
|
*/
|
|
add_to_path(New,Pos) :-
|
|
atom(New), !,
|
|
'$check_path'(New,Str),
|
|
atom_codes(Path,Str),
|
|
'$add_to_path'(Path,Pos).
|
|
|
|
'$add_to_path'(New,_) :- recorded('$path',New,R), erase(R), fail.
|
|
'$add_to_path'(New,last) :- !, recordz('$path',New,_).
|
|
'$add_to_path'(New,first) :- recorda('$path',New,_).
|
|
|
|
/** remove_from_path(+Directory:atom) is det,deprecated
|
|
|
|
*/
|
|
remove_from_path(New) :- '$check_path'(New,Path),
|
|
recorded('$path',Path,R), erase(R).
|
|
|
|
'$check_path'(At,SAt) :- atom(At), !, atom_codes(At,S), '$check_path'(S,SAt).
|
|
'$check_path'([],[]).
|
|
'$check_path'([Ch],[Ch]) :- '$dir_separator'(Ch), !.
|
|
'$check_path'([Ch],[Ch,A]) :- !, integer(Ch), '$dir_separator'(A).
|
|
'$check_path'([N|S],[N|SN]) :- integer(N), '$check_path'(S,SN).
|
|
|
|
/**
|
|
user:library_directory(?Directory:atom) is nondet, dynamic
|
|
|
|
Dynamic, multi-file predicate that succeeds when _Directory_ is a
|
|
current library directory name. Asserted in the user module.
|
|
|
|
Library directories are the places where files specified in the form
|
|
`library( _File_)` are searched by the predicates consult/1,
|
|
reconsult/1, use_module/1, ensure_loaded/1, and load_files/2.
|
|
|
|
*/
|
|
|
|
:- multifile user:library_directory/1.
|
|
|
|
:- dynamic user:library_directory/1.
|
|
|
|
/**
|
|
user:commons_directory(?Directory:atom) is nondet, dynamic
|
|
|
|
*/
|
|
|
|
:- multifile user:commons_directory/1.
|
|
|
|
:- dynamic user:commons_directory/1.
|
|
|
|
/**
|
|
user:prolog_file_type(?Suffix:atom, ?Handler:atom) is nondet, dynamic
|
|
|
|
*/
|
|
|
|
:- multifile user:prolog_file_type/2.
|
|
|
|
:- dynamic user:prolog_file_type/2.
|
|
|
|
user:prolog_file_type(yap, prolog).
|
|
user:prolog_file_type(pl, prolog).
|
|
user:prolog_file_type(prolog, prolog).
|
|
user:prolog_file_type(A, prolog) :-
|
|
current_prolog_flag(associate, A),
|
|
A \== prolog,
|
|
A \==pl,
|
|
A \== yap.
|
|
%user:prolog_file_type(qlf, prolog).
|
|
%user:prolog_file_type(qlf, qlf).
|
|
user:prolog_file_type(A, executable) :-
|
|
current_prolog_flag(shared_object_extension, A).
|
|
|
|
/**
|
|
user:file_search_path(+Name:atom, -Directory:atom) is nondet
|
|
|
|
Allows writing file names as compound terms. The _Name_ and
|
|
_DIRECTORY_ must be atoms. The predicate may generate multiple
|
|
solutions. The predicate is originally defined as follows:
|
|
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~prolog
|
|
file_search_path(library,A) :-
|
|
library_directory(A).
|
|
file_search_path(system,A) :-
|
|
prolog_flag(host_type,A).
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Thus, `compile(library(A))` will search for a file using
|
|
library_directory/1 to obtain the prefix,
|
|
whereas 'compile(system(A))` would look at the `host_type` flag.
|
|
|
|
@}
|
|
|
|
*/
|
|
|
|
:- multifile user:file_search_path/2.
|
|
|
|
:- dynamic user:file_search_path/2.
|
|
|
|
user:file_search_path(library, Dir) :-
|
|
library_directory(Dir).
|
|
user:file_search_path(commons, Dir) :-
|
|
commons_directory(Dir).
|
|
user:file_search_path(swi, Home) :-
|
|
current_prolog_flag(home, Home).
|
|
user:file_search_path(yap, Home) :-
|
|
current_prolog_flag(home, Home).
|
|
user:file_search_path(system, Dir) :-
|
|
prolog_flag(host_type, Dir).
|
|
user:file_search_path(foreign, yap('lib/Yap')).
|
|
user:file_search_path(path, C) :-
|
|
( getenv('PATH', A),
|
|
( current_prolog_flag(windows, true)
|
|
-> atomic_list_concat(B, ;, A)
|
|
; atomic_list_concat(B, :, A)
|
|
),
|
|
lists:member(C, B)
|
|
).
|
|
|