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)  2013, VU University Amsterdam
    7    All rights reserved.
    8
    9    Redistribution and use in source and binary forms, with or without
   10    modification, are permitted provided that the following conditions
   11    are met:
   12
   13    1. Redistributions of source code must retain the above copyright
   14       notice, this list of conditions and the following disclaimer.
   15
   16    2. Redistributions in binary form must reproduce the above copyright
   17       notice, this list of conditions and the following disclaimer in
   18       the documentation and/or other materials provided with the
   19       distribution.
   20
   21    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   22    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   23    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   24    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   25    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   26    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   27    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   28    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   29    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   31    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32    POSSIBILITY OF SUCH DAMAGE.
   33*/
   34
   35:- module(prolog_console_input,
   36          [
   37          ]).   38:- use_module(library(lists)).   39
   40:- multifile
   41    prolog:complete_input/4.   42
   43%!  prolog:complete_input(+BeforeCursor, +AfterCursor,
   44%!                        -Delete, -Completions) is det.
   45%
   46%   Compute    auto    completions    for      the     input    line
   47%   BeforeCursor+AfterCursor.
   48%
   49%   @arg    Delete is an atom or string representing the text that is
   50%           replaced by the completion
   51%   @arg    Completions is a list of elements of this shape:
   52%
   53%             - Atom
   54%             Used for a plain completion without comment
   55%             - Atom-Comment
   56%             Used for a completion with comment.  This will be
   57%             used for predicates.
   58
   59prolog:complete_input(Before, _After, Delete, Completions) :-
   60    string_codes(Before, Chars),
   61    reverse(Chars, BeforeRev),
   62    complete(BeforeRev, Delete, Completions).
   63
   64complete(BeforeRev, Prefix, Files) :-   % complete files
   65    phrase(file_prefix(Prefix), BeforeRev, _),
   66    !,
   67    atom_concat(Prefix, '*', Pattern),
   68    expand_file_name(Pattern, Files).
   69complete(BeforeRev, Prefix, Atoms) :-   % complete atoms
   70    phrase(atom_prefix(Prefix), BeforeRev, _),
   71    !,
   72    '$atom_completions'(Prefix, Atoms).
   73
   74%!  atom_prefix(-Prefix) is det.
   75
   76atom_prefix(Prefix) -->
   77    atom_chars(RevString),
   78    { reverse(RevString, String),
   79      string_codes(Prefix, String) % do not create an atom
   80    }.
   81
   82atom_chars([H|T]) --> atom_char(H), !, atom_chars(T).
   83atom_chars([]) --> [].
   84
   85atom_char(C) --> [C], { atom_char(C) }.
   86
   87atom_char(C) :- code_type(C, csym).
   88
   89%!  file_prefix(-Prefix)// is semidet.
   90%
   91%   True when the part before the cursor looks like a file name.
   92
   93file_prefix(Prefix) -->
   94    file_chars(RevString), "'",
   95    { reverse(RevString, String),
   96      atom_codes(Prefix, String)
   97    }.
   98
   99file_chars([H|T]) --> file_char(H), !, file_chars(T).
  100file_chars([]) --> [].
  101
  102file_char(C) --> [C], { file_char(C) }.
  103
  104file_char(C) :- code_type(C, csym).
  105file_char(0'/).
  106file_char(0'.).
  107file_char(0'-).
  108file_char(0'~).
  109:- if(current_prolog_flag(windows,true)).  110file_char(0':).
  111file_char(0'\s).
  112:- endif.