yap-6.3/packages/ProbLog/problog/version_control.yap

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%  $Date: 2010-12-02 15:20:15 +0100 (Thu, 02 Dec 2010) $
%  $Revision: 5043 $
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%  This file is part of ProbLog
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%  Theofrastos Mantadelis
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% Figuring out the version of a problog file in a nasty way :-D
% This way SVN does the work of keeping the file date
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:- module(version_control, [get_version/3]).

:- use_module(library(lists), [append/3, reverse/2]).

get_version(FilePath, Version, Revision):-
  open(FilePath, read, SI),
  repeat,
  get_line(SI, Line),
  (append(_, ['D','a','t','e',':'|Date], Line) ; at_end_of_stream(SI)),
  !,
  repeat,
  get_line(SI, NLine),
  (append(_, ['R','e','v','i','s','i','o','n',':'|Revision1], NLine) ; at_end_of_stream(SI)),
  !,
  close(SI),
  append(ReadDate,['$'|_],Date),
  append(Revision2,['$'|_],Revision1),
  atomic_concat(ReadDate, Version),
  atomic_concat(Revision2, Revision).

get_line(Stream, Line):-
  get_line(Stream, LineR, []),
  reverse(LineR, Line).
get_line(Stream, Line, Acc):-
  get_char(Stream, Char),
  ((Char = '\n' ; at_end_of_stream(Stream)) ->
    Line = Acc
  ;
    get_line(Stream, Line, [Char|Acc])
  ).