#!@PERL@
# -*- perl -*-
# @configure_input@

eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
    if 0;

# aclocal - create aclocal.m4 by scanning configure.ac

# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
#           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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

# Written by Tom Tromey <tromey@redhat.com>.

BEGIN
{
  my $perllibdir = $ENV{'perllibdir'} || '@datadir@/@PACKAGE@-@APIVERSION@';
  unshift @INC, $perllibdir;
}

use Automake::General;
use Automake::XFile;

# Some constants.
$VERSION = '@VERSION@';
$APIVERSION = '@APIVERSION@';
$PACKAGE = '@PACKAGE@';
# Note that this isn't pkgdatadir, but a separate directory.
# Note also that the versioned directory is handled later.
$acdir = '@datadir@/aclocal';
$default_acdir = $acdir;
# contains a list of directories, one per line, to be added
# to the dirlist in addition to $acdir, as if -I had been
# added to the command line.  If acdir has been redirected,
# we will also check the specified acdir (this is done later).
$default_dirlist = "$default_acdir/dirlist";

# Some globals.

# Exit status.
$exit_status = 0;

# Name of the top autoconf input: `configure.ac' or `configure.in'.
$configure_ac = find_configure_ac;

# Text to output.
$output = '';

# Output file name.
$output_file = 'aclocal.m4';

# Which macros have been seen.
%macro_seen = ();

# Which files have been seen.
%file_seen = ();

# Map macro names to file names.
%map = ();

# Map file names to file contents.
%file_contents = ();

# How much to say.
$verbose = 0;

# Matches a macro definition.
#   AC_DEFUN([macroname], ...)
# or
#   AC_DEFUN(macroname, ...)
# When macroname is `['-quoted , we accept any character in the name,
# except `]'.  Otherwise macroname stops on the first `]', `,', `)',
# or `\n' encountered.
$ac_defun_rx = "A[CU]_DEFUN\\((?:\\[([^]]+)\\]|([^],)\n]+))";

# Matches an AC_REQUIRE line.
$ac_require_rx = "AC_REQUIRE\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";



local (@dirlist) = &parse_arguments (@ARGV);
&scan_m4_files (@dirlist);
&scan_configure;
if (! $exit_status)
{
    &write_aclocal;
}
&check_acinclude;

exit $exit_status;

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

# Print usage and exit.
sub usage ($)
{
    local ($status) = @_;

    print "Usage: aclocal [OPTIONS] ...\n\n";
    print "\
Generate `aclocal.m4' by scanning `configure.ac' or `configure.in'

  --acdir=DIR           directory holding config files
  --help                print this help, then exit
  -I DIR                add directory to search list for .m4 files
  --output=FILE         put output in FILE (default aclocal.m4)
  --print-ac-dir        print name of directory holding m4 files
  --verbose             don't be silent
  --version             print version number, then exit

Report bugs to <bug-automake\@gnu.org>.\n";

    exit $status;
}

# Parse command line.
sub parse_arguments (@)
{
    local (@arglist) = @_;
    local (@dirlist);
    local ($print_and_exit) = 0;

    while (@arglist)
    {
	if ($arglist[0] =~ /^--acdir=(.+)$/)
	{
	    $acdir = $1;
	}
	elsif ($arglist[0] =~/^--output=(.+)$/)
	{
	    $output_file = $1;
	}
	elsif ($arglist[0] eq '-I')
	{
	    shift (@arglist);
	    push (@dirlist, $arglist[0]);
	}
	elsif ($arglist[0] eq '--print-ac-dir')
	{
	    $print_and_exit = 1;
	}
	elsif ($arglist[0] eq '--verbose')
	{
	    ++$verbose;
	}
	elsif ($arglist[0] eq '--version')
	{
	    print "aclocal (GNU $PACKAGE) $VERSION\n\n";
	    print "Copyright (C) 2002 Free Software Foundation, Inc.\n";
	    print "This is free software; see the source for copying conditions.  There is NO\n";
	    print "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n";
	    print "Written by Tom Tromey <tromey\@redhat.com>\n";
	    exit 0;
	}
	elsif ($arglist[0] eq '--help')
	{
	    &usage (0);
	}
	else
	{
	    die "aclocal: unrecognized option -- `$arglist[0]'\nTry `aclocal --help' for more information.\n";
	}

	shift (@arglist);
    }

    if ($print_and_exit)
    {
	print $acdir, "\n";
	exit 0;
    }

    $default_dirlist="$acdir/dirlist"
	if $acdir ne $default_acdir;

    # Search the versioned directory near the end, and then the
    # unversioned directory last.  Only do this if the user didn't
    # override acdir.
    push (@dirlist, "$acdir-$APIVERSION")
	if $acdir eq $default_acdir;

    # By default $(datadir)/aclocal doesn't exist.  We don't want to
    # get an error in the case where we are searching the default
    # directory and it hasn't been created.
    push (@dirlist, $acdir)
	unless $acdir eq $default_acdir && ! -d $acdir;

    # Finally, adds any directory listed in the `dirlist' file.
    if (open (DEFAULT_DIRLIST, $default_dirlist))
    {
	while (<DEFAULT_DIRLIST>)
	{
	    # Ignore '#' lines.
	    next if /^#/;
	    # strip off newlines and end-of-line comments
	    s/\s*\#.*$//;
	    chomp ($contents=$_);
	    if (-d $contents )
	    {
		push (@dirlist, $contents);
	    }
	}
	close (DEFAULT_DIRLIST);
    }


    return @dirlist;
}

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

sub scan_configure ()
{
    die "aclocal: `configure.ac' or `configure.in' is required\n"
        if !$configure_ac;

    open (CONFIGURE, $configure_ac)
	|| die "aclocal: couldn't open `$configure_ac': $!\n";

    # Make sure we include acinclude.m4 if it exists.
    if (-f 'acinclude.m4')
    {
	&add_file ('acinclude.m4');
    }

    while (<CONFIGURE>)
    {
	# Remove comments from current line.
	s/\bdnl\b.*$//;
	s/\#.*$//;

	# Search for things we know about.  The "search" sub is
	# constructed dynamically by scan_m4_files.  The last
	# parenthethical match makes sure we don't match things that
	# look like macro assignments or AC_SUBSTs.
	if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
	{
	    # Macro not found, but AM_ prefix found.
	    warn "aclocal: $configure_ac: $.: macro `$2' not found in library\n";
	    $exit_status = 1;
	}
    }

    close (CONFIGURE);
}

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

# Check macros in acinclude.m4.  If one is not used, warn.
sub check_acinclude ()
{
    local ($key);

    foreach $key (keys %map)
    {
	next unless $map{$key} eq 'acinclude.m4';
	if (! $macro_seen{$key})
	{
	    # FIXME: should print line number of acinclude.m4.
	    warn "aclocal: macro `$key' defined in acinclude.m4 but never used\n";
	}
    }
}

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

# Scan all the installed m4 files and construct a map.
sub scan_m4_files (@)
{
    local (@dirlist) = @_;

    # First, scan acinclude.m4 if it exists.
    if (-f 'acinclude.m4')
    {
	$file_contents{'acinclude.m4'} = &scan_file ('acinclude.m4');
    }

    local ($m4dir);
    foreach $m4dir (@dirlist)
    {
	opendir (DIR, $m4dir)
	    || die "aclocal: couldn't open directory `$m4dir': $!\n";
	local ($file, $fullfile);
	foreach $file (sort grep (! /^\./, readdir (DIR)))
	{
	    # Only examine .m4 files.
	    next unless $file =~ /\.m4$/;

	    # Skip some files when running out of srcdir.
	    next if $file eq 'aclocal.m4';

	    $fullfile = $m4dir . '/' . $file;
	    $file_contents{$fullfile} = &scan_file ($fullfile);
	}
	closedir (DIR);
    }

    # Construct a new function that does the searching.  We use a
    # function (instead of just evalling $search in the loop) so that
    # "die" is correctly and easily propagated if run.
    my $search = "sub search {\nmy \$found = 0;\n";
    foreach my $key (reverse sort keys %map)
    {
	$search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { & add_macro ("' . $key
		    . '"); $found = 1; }' . "\n");
    }
    $search .= "return \$found;\n};\n";
    eval $search;
    die "internal error: $@\n search is $search" if $@;
}

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

# Add a macro to the output.
sub add_macro ($)
{
    local ($macro) = @_;

    # We want to ignore AC_ macros.  However, if an AC_ macro is
    # defined in (eg) acinclude.m4, then we want to make sure we mark
    # it as seen.
    return if $macro =~ /^AC_/ && ! defined $map{$macro};

    if (! defined $map{$macro})
    {
	warn "aclocal: macro `$macro' required but not defined\n";
	$exit_status = 1;
	return;
    }

    print STDERR "aclocal: saw macro $macro\n" if $verbose;
    $macro_seen{$macro} = 1;
    &add_file ($map{$macro});
}

# Add a file to output.
sub add_file ($)
{
    local ($file) = @_;

    # Only add a file once.
    return if ($file_seen{$file});
    $file_seen{$file} = 1;

    $output .= $file_contents{$file} . "\n";
    my (@rlist);
    foreach (split ("\n", $file_contents{$file}))
    {
	# Remove comments from current line.
	s/\bdnl\b.*$//;
	s/\#.*$//;

	if (/$ac_require_rx/g)
	{
	    push (@rlist, $1 || $2);
	}

	# The search function is constructed dynamically by
	# scan_m4_files.  The last parenthethical match makes sure we
	# don't match things that look like macro assignments or
	# AC_SUBSTs.
	if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
	{
	    # Macro not found, but AM_ prefix found.
	    warn "aclocal: $configure_ac: $.: macro `$2' not found in library\n";
	    $exit_status = 1;
	}
    }

    local ($macro);
    foreach $macro (@rlist)
    {
	&add_macro ($macro);
    }
}

# Scan a single M4 file.  Return contents.
sub scan_file ($)
{
    local ($file) = @_;

    my $fh = new Automake::XFile $file;
    my $contents = '';
    while ($_ = $fh->getline)
    {
	# Ignore `##' lines.
	next if /^##/;

	$contents .= $_;

	if (/$ac_defun_rx/)
	{
	    if (! defined $map{$1 || $2})
	    {
		$map{$1 || $2} = $file;
	    }

	    # Note: we used to give an error here if we saw a
	    # duplicated macro.  However, this turns out to be
	    # extremely unpopular.  It causes actual problems which
	    # are hard to work around, especially when you must
	    # mix-and-match tool versions.

	    print STDERR "aclocal: found macro $1 in $file: $.\n" if $verbose;
	}
    }

    return $contents;
}

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

# Write output.
sub write_aclocal ()
{
    return if ! length ($output);

    print STDERR "aclocal: writing $output_file\n" if $verbose;

    my $out = new Automake::XFile "> $output_file";

# We used to print `# $output_file generated automatically etc.'  But
# this creates spurious differences when using autoreconf.  Autoreconf
# creates aclocal.m4t and then rename it to aclocal.m4, but the
# rebuild rules generated by Automake create aclocal.m4 directly --
# this would gives two ways to get the same file, with a different
# name in the header.
    print $out
"# generated automatically by aclocal $VERSION -*- Autoconf -*-

# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
# Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

$output";
}

### Setup "GNU" 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:
