#!/usr/bin/env perl
#
# David Bateman Sep 12 2006
# 
# Creates a source RPM from an octave package.

#use strict;
use Cwd;
use File::Find;
use File::Basename;
use Text::Wrap;
use FileHandle;

my $ofdir = shift @ARGV;
my $template = shift @ARGV;
my $rpmdir = shift @ARGV;

my @desc_files = ();
my $topdepth = ($ofdir) =~ tr!/!!;  #count slashes in top path
find(\&desc_files, $ofdir);
sub desc_files { # {{{1 populates global array @files
    return unless -f and /DESCRIPTION$/;
    my $depth = ($File::Find::name) =~ tr!/!!; #count slashes in file
    return if $depth > (2 + $topdepth);
    return if (-e "NOINSTALL");
    my $file = "$File::Find::dir/$_";
    $file =~ s|^[.]/||;
    push @desc_files, $file; 
} # 1}}}

exit unless ($#desc_files >= 0);

my ($dstr, $ver) = date();
my $contents = get_contents($ofdir);
my $name = $ofdir;
$name =~ s|^.*/||;
my $pkg = sprintf("octave-forge-%s-%s.tar.gz", $name, $ver);
my %desc = ( 'NAME', $name, 
	    'VERSION', $ver, 
	    'PACKAGE', $pkg, 
	    'DESCRIPTION', $contents, 
	    'DATE', $dstr, 
	    'MAINTAINER', 'The Octave-Forge Community');

my $spec = sprintf("%s/SPECS/octave_forge_%s-%s.spec", $rpmdir, 
		   $desc{"NAME"}, $desc{"VERSION"});

create_spec ($spec, $template, %desc);
create_srpm ($spec, $pkg, $rpmdir);

sub date {
    my ($second, $minute, $hour, $dayOfMonth, $month, $yearOffset, 
	$dayOfWeek, $dayOfYear, $daylightSavings) = localtime();
    my @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
    my @weekdays = qw(Sun Mon Tue Wed Thu Fri Sat Sun);
    my $dstr = sprintf("%s %s %d %d", $weekdays[$dayOfWeek], 
		       $months[$month], $dayOfMonth, $yearOffset+1900);
    my $ver = sprintf("%4s%02s%02s", $yearOffset+1900, $month+1, $dayOfMonth);
    return ($dstr, $ver);
}

sub get_contents {
    my ($ofdir		# The directory where to find the CONTENTS file
	)	= @_;
    my $file = sprintf ("%s/CONTENTS", $ofdir);
    open (CNT, $file) or die  "Could not open file $file";
    my $cnt = "";
    while (<CNT>) {
	$cnt = sprintf("%s%s", $cnt, $_);
    }
    close (CNT);

    return $cnt;
}

sub create_srpm {	# {{{1
    my ($spec,		# The spec file to write
	$pkg,		# The binary octave package itself
	$rpmdir		# Where the rpm's are built
	)	= @_;
    system (sprintf("rpmbuild -bs --define '_topdir %s' %s", $rpmdir, $spec));
}	# 1}}}

sub create_spec {	# {{{1
    my ($spec,		# The spec file to write
	$template,	# The location of the template
	%desc		# The hash of the description file
	)	= @_;

    open (OUT,sprintf(">%s",$spec)) or die "Couldn't open $spec";
    open (RPM,$template) or die "Could not open file $template";
    while (<RPM>) {
	while ( /@\w+@/ ) {
	    my $keyword = $_;
	    $keyword =~ s/^.*@(\w*)@.*$/\1/;
	    chomp $keyword;
	    my $key = sprintf("@%s@", $keyword);
	    if (! defined $desc{$keyword} ) {
		s/$key//;
	    } else {
		my $value = $desc{$keyword};
		s/$key/$value/;
	    }
	}
	if ( /^>>REQUIRES<<$/ ) {
	    my $depstr = "";
	    foreach my $f ( @desc_files ) {
		open (DESC, $f) or die "Could not open file $f";
		my $specname;
		my $specversion;
		while ( <DESC> ) {
		    if ( /^Name:/ ) {
			$specname = $_;
			$specname =~ s/^Name:\s*//;
			chomp $specname;
			$specname = sprintf ("octave_%s", lc $specname);
		    }
		    if ( /^Version:/ ) {
			$specversion = $_;
			$specversion =~ s/^Version:\s*//;
			chomp $specversion;
		    }
		}
		close (DESC);
		$depstr = sprintf("%sRequires:  %s = %s\n", 
				  $depstr, $specname, $specversion);
	    } 
	    $_ = $depstr;
	}
	print OUT sprintf("%s", $_);
    }
    close (OUT);
    close (RPM);
}	# 1}}}
__END__
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 of the License, 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 <http://www.gnu.org/licenses/>.
This program is granted to the public domain.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.