# @configure_input@
#
# Add directories to @INC, Perl's module search path, to find modules,
# either in the source or build directories.

package Texinfo::ModulePath;

use vars qw($VERSION);

$VERSION = '6.3dev';

use File::Basename;
use File::Spec;

# If $LIB_DIR and $LIBEXEC_DIR are given,
# (likely the installation directories)
# use them to add directories
# to @INC.
#
# LIB_DIR is for bundled libraries.
# LIBEXEC_DIR is for XS modules.
#
# otherwise use 'top_srcdir'
# and 'top_builddir' environment variables.
sub init (;$$) {
  my $lib_dir = shift;
  my $libexec_dir = shift;
  my %named_args = @_;

  if (!$ENV{'top_srcdir'} and !$ENV{'top_builddir'}
      and $named_args{'updirs'}) {
    my ($real_command_name, $command_directory, $command_suffix) 
            = fileparse($0, '.pl');
    my $updir = File::Spec->updir();

    # e.g. tp/t -> tp/t/../.. for 'updirs' = 2.
    my $count = $named_args{'updirs'};
    my $top_srcdir = $command_directory;
    while ($count-- > 0) {
      $top_srcdir = File::Spec->catdir($top_srcdir, $updir);
    }
    $ENV{'top_srcdir'} = $top_srcdir;
  }

  if (defined($ENV{'top_builddir'}) and !defined($ENV{'top_srcdir'})) {
    $ENV{'top_srcdir'} = $ENV{'top_builddir'};
  } elsif (!defined($ENV{'top_builddir'}) and defined($ENV{'top_srcdir'})) {
    $ENV{'top_builddir'} = $ENV{'top_srcdir'};
  }
   
  if (!$lib_dir) {
    if (defined($ENV{'top_srcdir'})) {
      # For Texinfo::Parser and the rest.
      unshift @INC, File::Spec->catdir($ENV{'top_srcdir'}, 'tp');

      $lib_dir = File::Spec->catdir($ENV{'top_srcdir'}, 'tp', 'maintain');
    }
  }

  # module using values from configure
  if (defined($lib_dir)) {
    #warn "lib dir is $lib_dir\n";

    unshift @INC, $lib_dir;

    # '@USE_EXTERNAL_LIBINTL @' and similar are substituted
    if ('@USE_EXTERNAL_LIBINTL@' ne 'yes') {
      unshift @INC, (File::Spec->catdir($lib_dir, 'lib', 'libintl-perl', 'lib'));
    }
    if ('@USE_EXTERNAL_EASTASIANWIDTH@' ne 'yes') {
      unshift @INC, (File::Spec->catdir($lib_dir, 'lib', 'Unicode-EastAsianWidth', 'lib'));
    }
    if ('@USE_EXTERNAL_UNIDECODE@' ne 'yes') {
      unshift @INC, (File::Spec->catdir($lib_dir, 'lib', 'Text-Unidecode', 'lib'));
    }
  }

  if (!$libexec_dir) {
    # XSParagraph.la is generated in the build directory.
    if (defined($ENV{'top_builddir'})) {
      $libexec_dir = File::Spec->catdir($ENV{'top_builddir'}, 'tp',
        'Texinfo', 'Convert', 'XSParagraph');
    }
  }

  if (defined($libexec_dir)) {
    unshift @INC, (File::Spec->catdir($libexec_dir));
  }
  if (defined $ENV{'top_builddir'}) {
    unshift @INC, (File::Spec->catdir($ENV{'top_builddir'}, 'tp',
        'Texinfo', 'MiscXS'));
  }
}

1;
