126 lines
3.0 KiB
Prolog
126 lines
3.0 KiB
Prolog
/*************************************************************************
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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 1985-1997 *
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* *
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*************************************************************************/
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:- system_module( '$os', [
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cd/0,
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cd/1,
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getcwd/1,
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ls/0,
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pwd/0,
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unix/1,
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putenv/2,
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getenv/2,
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setenv/2
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], [] ).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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/**
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* @short YAP core Operating system interface.
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*
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*/
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cd :-
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cd('~').
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cd(F) :-
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absolute_file_name(F, Dir, [file_type(directory),file_errors(fail),access(execute),expand(true)]),
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working_directory(_, Dir).
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getcwd(Dir) :- working_directory(Dir, Dir).
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ls :-
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getcwd(X),
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'$load_system_ls'(X,L),
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'$do_print_files'(L).
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'$load_system_ls'(X,L) :-
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'$undefined'(directory_files(X, L), operating_system_support),
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load_files(library(system),[silent(true)]),
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fail.
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'$load_system_ls'(X,L) :-
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operating_system_support:directory_files(X, L).
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'$do_print_files'([]) :-
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nl.
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'$do_print_files'([F| Fs]) :-
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'$do_print_file'(F),
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'$do_print_files'(Fs).
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'$do_print_file'('.') :- !.
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'$do_print_file'('..') :- !.
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'$do_print_file'(F) :- atom_concat('.', _, F), !.
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'$do_print_file'(F) :-
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write(F), write(' ').
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pwd :-
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getcwd(X),
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write(X), nl.
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unix(V) :- var(V), !,
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'$do_error'(instantiation_error,unix(V)).
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unix(argv(L)) :- '$is_list_of_atoms'(L,L), !, '$argv'(L).
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unix(argv(V)) :-
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'$do_error'(type_error(atomic,V),unix(argv(V))).
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unix(cd) :- cd('~').
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unix(cd(A)) :- cd(A).
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unix(environ(X,Y)) :- '$do_environ'(X,Y).
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unix(getcwd(X)) :- getcwd(X).
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unix(shell(V)) :- var(V), !,
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'$do_error'(instantiation_error,unix(shell(V))).
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unix(shell(A)) :- atom(A), !, '$shell'(A).
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unix(shell(A)) :- string(A), !, '$shell'(A).
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unix(shell(V)) :-
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'$do_error'(type_error(atomic,V),unix(shell(V))).
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unix(system(V)) :- var(V), !,
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'$do_error'(instantiation_error,unix(system(V))).
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unix(system(A)) :- atom(A), !, system(A).
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unix(system(A)) :- string(A), !, system(A).
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unix(system(V)) :-
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'$do_error'(type_error(atom,V),unix(system(V))).
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unix(shell) :- sh.
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unix(putenv(X,Y)) :- '$putenv'(X,Y).
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'$is_list_of_atoms'(V,_) :- var(V),!.
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'$is_list_of_atoms'([],_) :- !.
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'$is_list_of_atoms'([H|L],L0) :- !,
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'$check_if_head_may_be_atom'(H,L0),
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'$is_list_of_atoms'(L,L0).
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'$is_list_of_atoms'(H,L0) :-
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'$do_error'(type_error(list,H),unix(argv(L0))).
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'$check_if_head_may_be_atom'(H,_) :-
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var(H), !.
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'$check_if_head_may_be_atom'(H,_) :-
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atom(H), !.
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'$check_if_head_may_be_atom'(H,L0) :-
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'$do_error'(type_error(atom,H),unix(argv(L0))).
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'$do_environ'(X, Y) :-
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var(X), !,
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'$do_error'(instantiation_error,unix(environ(X,Y))).
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'$do_environ'(X, Y) :- atom(X), !,
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'$getenv'(X,Y).
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'$do_environ'(X, Y) :-
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'$do_error'(type_error(atom,X),unix(environ(X,Y))).
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putenv(Na,Val) :-
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'$putenv'(Na,Val).
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getenv(Na,Val) :-
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'$getenv'(Na,Val).
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setenv(Na,Val) :-
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'$putenv'(Na,Val).
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