96 lines
2.4 KiB
Prolog
Executable File
96 lines
2.4 KiB
Prolog
Executable File
:- module('$swi',
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[]).
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%% file_alias_path(-Alias, ?Dir) is nondet.
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%
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% True if file Alias points to Dir. Multiple solutions are
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% generated with the longest directory first.
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%% file_name_on_path(+File:atom, -OnPath) is det.
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%
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% True if OnPath a description of File based on the file search
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% path. This performs the inverse of absolute_file_name/3.
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prolog:file_name_on_path(Path, ShortId) :-
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( prolog:file_alias_path(Alias, Dir),
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atom_concat(Dir, Local, Path)
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-> ( Alias == '.'
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-> ShortId = Local
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; file_name_extension(Base, pl, Local)
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-> ShortId =.. [Alias, Base]
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; ShortId =.. [Alias, Local]
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)
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; ShortId = Path
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).
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:- dynamic
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alias_cache/2.
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prolog:file_alias_path(Alias, Dir) :-
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( alias_cache(_, _)
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-> true
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; build_alias_cache
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),
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( nonvar(Dir)
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-> ensure_slash(Dir, DirSlash),
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alias_cache(Alias, DirSlash)
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; alias_cache(Alias, Dir)
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).
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build_alias_cache :-
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findall(t(DirLen, AliasLen, Alias, Dir),
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search_path(Alias, Dir, AliasLen, DirLen), Ts),
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sort(Ts, List0),
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reverse(List0, List),
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forall(lists:member(t(_, _, Alias, Dir), List),
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assert(alias_cache(Alias, Dir))).
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search_path('.', Here, 999, DirLen) :-
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working_directory(Here0, Here0),
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ensure_slash(Here0, Here),
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atom_length(Here, DirLen).
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search_path(Alias, Dir, AliasLen, DirLen) :-
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user:file_search_path(Alias, _),
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Alias \== autoload,
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Spec =.. [Alias,'.'],
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atom_length(Alias, AliasLen0),
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AliasLen is 1000 - AliasLen0, % must do reverse sort
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absolute_file_name(Spec, Dir0,
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[ file_type(directory),
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access(read),
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solutions(all),
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file_errors(fail)
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]),
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ensure_slash(Dir0, Dir),
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atom_length(Dir, DirLen).
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ensure_slash(Dir, Dir) :-
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sub_atom(Dir, _, _, 0, /), !.
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ensure_slash(Dir0, Dir) :-
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atom_concat(Dir0, /, Dir).
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reverse(List, Reversed) :-
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reverse(List, [], Reversed).
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reverse([], Reversed, Reversed).
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reverse([Head|Tail], Sofar, Reversed) :-
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reverse(Tail, [Head|Sofar], Reversed).
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%% win_add_dll_directory(+AbsDir) is det.
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%
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% Add AbsDir to the directories where dependent DLLs are searched
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% on Windows systems.
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:- if(current_prolog_flag(windows, true)).
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prolog:win_add_dll_directory(Dir) :-
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win_add_dll_directory(Dir, _), !.
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prolog:win_add_dll_directory(Dir) :-
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prolog_to_os_filename(Dir, OSDir),
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getenv('PATH', Path0),
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atomic_list_concat([Path0, OSDir], ';', Path),
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setenv('PATH', Path).
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:- endif.
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