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)  2018, VU University Amsterdam
    7			 CWI, Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   29    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   30    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(prolog_config,
   37          [ prolog_dump_runtime_variables/0
   38          ]).   39
   40/** <module> Provide configuration information
   41
   42This module provides information about   the configuration to facilitate
   43linking against Prolog, embedding Prolog or calling Prolog.
   44*/
   45
   46:- multifile
   47    prolog:runtime_config/2.   48
   49%!  prolog_dump_runtime_variables
   50%
   51%   Dump the current configuration in shell   format.  This predicate is
   52%   called  when  Prolog  is  started    using  the  commandline  option
   53%   `--dump-runtime-variables`
   54
   55prolog_dump_runtime_variables :-
   56    (   '$cmd_option_val'(config, Format),
   57        Format \== ''
   58    ->  prolog_dump_runtime_variables(Format)
   59    ;   prolog_dump_runtime_variables(sh)
   60    ).
   61
   62prolog_dump_runtime_variables(Format) :-
   63    print_flag(home,                      'PLBASE',    Format),
   64    print_flag(arch,                      'PLARCH',    Format),
   65    print_flag(address_bits,              'PLBITS',    Format),
   66    print_flag(version,                   'PLVERSION', Format),
   67    print_flag(shared_object_extension,   'PLSOEXT',   Format),
   68    print_flag(shared_object_search_path, 'PLSOPATH',  Format),
   69    print_flag(c_libdir,                  'PLLIBDIR',  Format),
   70    print_flag(c_lib,                     'PLLIB',     Format),
   71    print_flag(open_shared_object,        'PLSHARED',  Format),
   72    print_flag(threads,                   'PLTHREADS', Format).
   73
   74print_flag(Flag, Var, Format) :-
   75    (   prolog:runtime_config(Flag, Value)
   76    ->  print_config(Format, Var, Value)
   77    ;   flag_value(Flag, Value)
   78    ->  print_config(Format, Var, Value)
   79    ;   true
   80    ).
   81
   82flag_value(Flag, Value) :-
   83    boolean_flag(Flag),
   84    (   current_prolog_flag(Flag, true)
   85    ->  Value = yes
   86    ;   Value = no
   87    ).
   88flag_value(c_libdir, Value) :-
   89    current_prolog_flag(home, Home),
   90    (   current_prolog_flag(c_libdir, Rel)
   91    ->  atomic_list_concat([Home, Rel], /, Value)
   92    ;   current_prolog_flag(arch, Arch)
   93    ->  atomic_list_concat([Home, lib, Arch], /, Value)
   94    ).
   95flag_value(c_lib, '-lswipl').
   96flag_value(Flag, Value) :-
   97    current_prolog_flag(Flag, Value).
   98
   99boolean_flag(threads).
  100boolean_flag(open_shared_object).
  101
  102print_config(sh, Var, Value) :-
  103    format('~w=\"~w\";~n', [Var, Value]).
  104print_config(cmd, Var, Value) :-
  105    (   file_var(Var)
  106    ->  prolog_to_os_filename(Value, OSValue),
  107        format('SET ~w=~w~n', [Var, OSValue])
  108    ;   format('SET ~w=~w~n', [Var, Value])
  109    ).
  110
  111file_var('PLBASE')