1# Copyright (C) 2003-2012 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 2, or (at your option)
6# any later version.
7
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16###############################################################
17# The main copy of this file is in Automake's git repository. #
18# Updates should be sent to automake-patches@gnu.org.         #
19###############################################################
20
21package Autom4te::Configure_ac;
22
23use 5.006;
24use strict;
25use Exporter;
26use Autom4te::Channels;
27use Autom4te::ChannelDefs;
28
29use vars qw (@ISA @EXPORT);
30
31@ISA = qw (Exporter);
32@EXPORT = qw (&find_configure_ac &require_configure_ac);
33
34=head1 NAME
35
36Autom4te::Configure_ac - Locate configure.ac or configure.in.
37
38=head1 SYNOPSIS
39
40  use Autom4te::Configure_ac;
41
42  # Try to locate configure.in or configure.ac in the current
43  # directory.  It may be absent.  Complain if both files exist.
44  my $file_name = find_configure_ac;
45
46  # Likewise, but bomb out if the file does not exist.
47  my $file_name = require_configure_ac;
48
49  # Likewise, but in $dir.
50  my $file_name = find_configure_ac ($dir);
51  my $file_name = require_configure_ac ($dir);
52
53=over 4
54
55=back
56
57=head2 Functions
58
59=over 4
60
61=item C<$configure_ac = find_configure_ac ([$directory])>
62
63Find a F<configure.ac> or F<configure.in> file in C<$directory>,
64defaulting to the current directory.  Complain if both files are present.
65Return the name of the file found, or the former if neither is present.
66
67=cut
68
69sub find_configure_ac (;@)
70{
71  my ($directory) = @_;
72  $directory ||= '.';
73  my $configure_ac =
74    File::Spec->canonpath (File::Spec->catfile ($directory, 'configure.ac'));
75  my $configure_in =
76    File::Spec->canonpath (File::Spec->catfile ($directory, 'configure.in'));
77
78  if (-f $configure_ac)
79    {
80      if (-f $configure_in)
81	{
82	  msg ('unsupported',
83	       "'$configure_ac' and '$configure_in' both present.\n"
84	       . "proceeding with '$configure_ac'");
85	}
86      return $configure_ac
87    }
88  elsif (-f $configure_in)
89    {
90      return $configure_in;
91    }
92  return $configure_ac;
93}
94
95
96=item C<$configure_ac = require_configure_ac ([$directory])>
97
98Like C<find_configure_ac>, but fail if neither is present.
99
100=cut
101
102sub require_configure_ac (;$)
103{
104  my $res = find_configure_ac (@_);
105  fatal "'configure.ac' or 'configure.in' is required"
106    unless -f $res;
107  return $res
108}
109
1101;
111
112### Setup "GNU" style for perl-mode and cperl-mode.
113## Local Variables:
114## perl-indent-level: 2
115## perl-continued-statement-offset: 2
116## perl-continued-brace-offset: 0
117## perl-brace-offset: 0
118## perl-brace-imaginary-offset: 0
119## perl-label-offset: -2
120## cperl-indent-level: 2
121## cperl-brace-offset: 0
122## cperl-continued-brace-offset: 0
123## cperl-label-offset: -2
124## cperl-extra-newline-before-brace: t
125## cperl-merge-trailing-else: nil
126## cperl-continued-statement-offset: 2
127## End:
128