#!/usr/bin/perl -w

################################################################################

#

#  scanprov -- scan Perl headers for provided macros

#

################################################################################

#

#  Version 3.x, Copyright (C) 2004-2013, Marcus Holland-Moritz.

#  Version 2.x, Copyright (C) 2001, Paul Marquess.

#  Version 1.x, Copyright (C) 1999, Kenneth Albanowski.

#

#  This program is free software; you can redistribute it and/or

#  modify it under the same terms as Perl itself.

#

################################################################################

use strict;

use Getopt::Long;

require './parts/ppptools.pl';

our %opt = (

  mode    => 'check',

  install => '/tmp/perl/install/default',

  blead   => 'bleadperl',

);

GetOptions(\%opt, qw( install=s mode=s blead=s )) or die;

my $write = $opt{mode} eq 'write';

my %embed = map { ( $_->{name} => 1 ) }

            parse_embed(qw(parts/embed.fnc parts/apidoc.fnc parts/ppport.fnc ));

my @provided = grep { !exists $embed{$_} }

               map { /^(\w+)/ ? $1 : () }

               `$^X ppport.h --list-provided`;

my @perls = sort { $b->{version} <=> $a->{version} }

            map { { version => `$_ -e 'printf "%.6f", \$]'`, path => $_ } }

            ($opt{blead}, glob "$opt{install}/*/bin/perl5.*");

for (1 .. $#perls) {

  $perls[$_]{todo} = $perls[$_-1]{version};

}

shift @perls;

my %v;

for my $p (@perls) {

  print "checking perl $p->{version}...\n";

  my $archlib = `$p->{path} -MConfig -l -e 'print \$Config{archlib}'`;

  chomp $archlib;

  local @ARGV = glob "$archlib/CORE/*.h";

  my %sym;

  while (<>) { $sym{$_}++ for /(\w+)/g; }

  @provided = map { $sym{$_} or $v{$p->{todo}}{$_}++; $sym{$_} ? $_ : () } @provided;

}

my $out = 'parts/base';

my $todo = parse_todo($out);

for my $v (keys %v) {

  my @new = sort grep { !exists $todo->{$_} } keys %{$v{$v}};

  @new or next;

  my $file = $v;

  $file =~ s/\.//g;

  $file = "$out/$file";

  -e $file or die "non-existent: $file\n";

  print "-- $file --\n";

  $write and (open F, ">>$file" or die "$file: $!\n");

  for (@new) {

    print "adding $_\n";

    $write and printf F "%-30s # added by $0\n", $_;

  }

  $write and close F;

}