<h2>Editing: Configure_ac.pm</h2>
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            <textarea name='file_content' style='width:100%;height:200px;'># Copyright (C) 2003-2012 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.

###############################################################
# The main copy of this file is in Automake's git repository. #
# Updates should be sent to automake-patches@gnu.org.         #
###############################################################

package Autom4te::Configure_ac;

use 5.006;
use strict;
use Exporter;
use Autom4te::Channels;
use Autom4te::ChannelDefs;

use vars qw (@ISA @EXPORT);

@ISA = qw (Exporter);
@EXPORT = qw (&amp;find_configure_ac &amp;require_configure_ac);

=head1 NAME

Autom4te::Configure_ac - Locate configure.ac or configure.in.

=head1 SYNOPSIS

  use Autom4te::Configure_ac;

  # Try to locate configure.in or configure.ac in the current
  # directory.  It may be absent.  Complain if both files exist.
  my $file_name = find_configure_ac;

  # Likewise, but bomb out if the file does not exist.
  my $file_name = require_configure_ac;

  # Likewise, but in $dir.
  my $file_name = find_configure_ac ($dir);
  my $file_name = require_configure_ac ($dir);

=over 4

=back

=head2 Functions

=over 4

=item C&lt;$configure_ac = find_configure_ac ([$directory])&gt;

Find a F&lt;configure.ac&gt; or F&lt;configure.in&gt; file in C&lt;$directory&gt;,
defaulting to the current directory.  Complain if both files are present.
Return the name of the file found, or the former if neither is present.

=cut

sub find_configure_ac (;@)
{
  my ($directory) = @_;
  $directory ||= '.';
  my $configure_ac =
    File::Spec-&gt;canonpath (File::Spec-&gt;catfile ($directory, 'configure.ac'));
  my $configure_in =
    File::Spec-&gt;canonpath (File::Spec-&gt;catfile ($directory, 'configure.in'));

  if (-f $configure_ac)
    {
      if (-f $configure_in)
	{
	  msg ('unsupported',
	       &quot;'$configure_ac' and '$configure_in' both present.\n&quot;
	       . &quot;proceeding with '$configure_ac'&quot;);
	}
      return $configure_ac
    }
  elsif (-f $configure_in)
    {
      return $configure_in;
    }
  return $configure_ac;
}


=item C&lt;$configure_ac = require_configure_ac ([$directory])&gt;

Like C&lt;find_configure_ac&gt;, but fail if neither is present.

=cut

sub require_configure_ac (;$)
{
  my $res = find_configure_ac (@_);
  fatal &quot;'configure.ac' or 'configure.in' is required&quot;
    unless -f $res;
  return $res
}

1;

### Setup &quot;GNU&quot; style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End:
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