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use strict;
use warnings;
use FindBin;
use ExtUtils::MakeMaker;

my $win32 = ($^O eq 'MSWin32');

# use Devel::CheckLib for sure?

my ($groonga_h, $inc, $libs) = check_env() or do {
  warn "groonga.h is not found; install groonga and/or set GROONGA_INC/GROONGA_LIBS environmental variables if necessary\n";
  exit(0);  # N/A
};

my @export_ok;
extract_constants($groonga_h);
extract_apis($groonga_h);
extract_bulk($groonga_h);
write_export(\@export_ok);

my %params = (
  NAME          => 'Groonga::API',
  AUTHOR        => 'Kenichi Ishigaki <ishigaki@cpan.org>',
  VERSION_FROM  => 'lib/Groonga/API.pm',
  ABSTRACT_FROM => 'lib/Groonga/API.pm',
  LICENSE       => 'perl',
  OBJECT        => '$(O_FILES)',
  PREREQ_PM     => {
    'Exporter'            => 0,
    'JSON::XS'            => 0,
    'Path::Extended'      => 0,
    'Test::Differences'   => 0,
    'Test::More'          => '0.88',
    'Test::UseAllModules' => '0.10',
    'version'             => '0.77',
  },
  META_MERGE => {
    resources => {
      repository => 'https://github.com/charsbar/groonga-api',
    },
  },
  test => {TESTS => 't/*.t t/*/*.t'},
  clean => {FILES => '*.inc *.old *.log'},
);

$params{INC}  = $inc  if $inc;
$params{LIBS} = $libs if $libs;

my $eumm = eval $ExtUtils::MakeMaker::VERSION;
delete $params{LICENSE}          if $eumm < 6.31;
delete $params{META_MERGE}       if $eumm < 6.46;

WriteMakefile(%params);

#------------
# utilities
#------------

sub check_env {
  my ($groonga_h, $inc, $libs);

  my @incpath = qw(/usr/local/include /usr/include);
  if ($win32 && eval {require Win32}) {
    my $path = Win32::GetShortPathName('c:\Program Files\groonga\include');
    push @incpath, $path if $path;
  }
  if ($ENV{GROONGA_INC}) {
    $inc = $ENV{GROONGA_INC};
    $inc =~ s|^["']||;
    $inc =~ s|["']$||;
    $inc =~ s/^\-I//;
    $inc =~ s|\\|/|g;
    $inc =~ s|/$||g;
    unshift @incpath, $inc;
  }
  for (@incpath) {
    if (-e "$_/groonga/groonga.h") {
      $groonga_h = "$_/groonga/groonga.h";
      $inc = $_;
      last;
    }
  }
  return unless $groonga_h;

  (my $lib = $inc) =~ s|include$|lib|;
  $libs = $ENV{GROONGA_LIBS} || "-L$lib -l" . ($win32 ? "libgroonga.dll" : "groonga");
  $inc  = $ENV{GROONGA_INC}  || "-I$inc";

  return ($groonga_h, $inc, $libs);
}

sub extract_constants {