#! /usr/local/bin/perl -w
require 5.003;
use Cwd;

# Builds a release.  Arguments are zero or more of the words.
#
#	tar		-- build a tar file			*.tar
#	compress	-- build a compressed tar file		*.tar.Z
#	gzip		-- build a compressed tar file		*.tar.gz
#	bzip2		-- build a compressed tar file		*.tar.bz2
#
# If no arguments are given then `gzip' is assumed.  If the only argument
# is the word `all' then all forms are used.

$releases = "./releases";	# Directory for release tarballs

##############################################################################
# Read version info, return an array (MAJOR,MINOR,RELEASE,PATCHLEVEL) or
# a string "MAJOR.MINOR.RELEASE PATCHLEVEL"
#
sub getver () {
   my @ver;

   open SRC, "./src/H5private.h" or die "cannot read HDF5 version";
   while (<SRC>) {
      $ver[0] = $1 if /define\s+HDF5_MAJOR_VERSION\s+(\d+)/;
      $ver[1] = $1 if /define\s+HDF5_MINOR_VERSION\s+(\d+)/;
      $ver[2] = $1 if /define\s+HDF5_RELEASE_VERSION\s+(\d+)/;
      $ver[3] = $1 if /define\s+HDF5_PATCH_VERSION\s+(\d+)/;
   }
   close SRC;
   wantarray ? @ver : "$ver[0].$ver[1].$ver[2]".chr(ord('a')+$ver[3]);
}

##############################################################################
# Set version information.  Input is a string or an array.
#
sub setver ($;$$$) {
   my @ver = @_;
   local $_;

   if ($ver[0]=~/\D/) {
      @ver = $ver[0] =~ /^(\d+)\.(\d+)\.(\d+)([a-z])$/ or return "";
      $ver[3] = ord($ver[3])-ord('a');
   }

   $_ = `cat ./src/H5private.h`;
   s/(define\s+HDF5_MAJOR_VERSION\s+)(\d+)/$1$ver[0]/;
   s/(define\s+HDF5_MINOR_VERSION\s+)(\d+)/$1$ver[1]/;
   s/(define\s+HDF5_RELEASE_VERSION\s+)(\d+)/$1$ver[2]/;
   s/(define\s+HDF5_PATCH_VERSION\s+)(\d+)/$1$ver[3]/;
   open SRC, "> ./src/H5private.h" or return "";
   print SRC $_;
   close SRC;

   return 1;
}

##############################################################################
# Build a release
#
sub release (@) {
   my @types = @_;
   my ($ver, $status, $created_symlink);
   local $_;

   # Make sure the version number is correct.
   print "Building an HDF release...\n";
   print "HDF version to release [", ($ver=getver), "] ";
   return "" unless defined ($_=<STDIN>);
   chomp;
   (setver ($ver=$_) or die "cannot set version") if /\S/;

   # Clean the source tree, showing only errors.
   print "Cleaning source tree...\n";
   $status = system "make distclean >/dev/null";
   die "cannot make distclean" if $status >> 8;

   # Move default top-level makefile into place.
   $status = system "cp Makefile.dist Makefile";
   die "cannot install default Makefile" if $status >> 8;

   # Make sure release directory exists
   (mkdir $releases, 0777 or die "cannot create $releases")
       unless -d $releases;
   die "no manifest" unless -r "MANIFEST";

   # We build the release from above the root of the source tree so the
   # hdf5 directory appears as part of the name in the tar file. We create
   # a temporary symlink called something like `hdf-5.0.0a' that points to
   # our current working directory.
   $_ = cwd;
   my ($parent,$root) = m%(.*)/(.*)$% or die "cannot split directory";
   if ($root ne "hdf-$ver" && ! -e "../hdf-$ver") {
      symlink $root, "../hdf-$ver" or die "cannot create link";
      $created_symlink = 1;
   }
   my $name = "$root/$releases/hdf-$ver";

   # Build the releases.
   @types = ("gzip") unless @types;
   @types = qw/tar gzip compress bzip2/ if 1==@types && "all" eq $types[0];
   $_ = `cat MANIFEST`;
   s/^\.\///mg;
   @filelist = ("Makefile", split /\s*\n/, $_);
   $filelist = join " ", map {"hdf-$ver/$_"} @filelist;

   chdir ".." or die;
   for (@types) {
      print "Compressing with $_...\n";

      /^tar$/ && do {
	 $status = system "tar cf $name.tar $filelist";
	 next;
      };

      /^gzip$/ && do {
	 $status = system "tar cf - $filelist |gzip -9 >$name.tar.gz";
	 next;
      };

      /^compress$/ && do {
	 $status = system "tar cf - $filelist |compress -c >$name.tar.Z";
	 next;
      };

      /^bzip2$/ && do {
	 $status = system "tar cf - $filelist |bzip2 -9 >$name.tar.bz2";
	 next;
      };
   } continue {
      print STDERR "$_ failed\n" if $status >> 8;
   }
   chdir $root or die;

   # Remove the temporary symlink we created above.
   unlink "../hdf-$ver" if $created_symlink;
   

   # Update version info
   print <<EOF;

If this is a real release then the version number for continued development
should be incremented.  Otherwise just press return.

EOF
   print "Set development version to [", ($ver=getver), "] ";
   return "" unless defined ($_ = <STDIN>);
   chomp;
   (setver ($ver=$_) or die "cannot set version") if /\S/;

   if (-d "CVS") {
      print <<EOF;
      # If we're running under CVS then check in changes and tag all files
      # with the release number.  Quincey, do you want to add this to the
      # bottom of the perl script?  Otherwise just give me the commands
      # and I'll add them.
EOF
   }

   return 1;
}

release @ARGV;