#!/usr/bin/perl -i

# Untar a MySQL distribution, change the copyright texts,
# pack it up again to a given directory

$VER="1.2";

use Getopt::Long;

$opt_help    = 0;
$opt_version = 0;
$opt_target  = "mysql-copyright-target-";
$opt_target .= `date +%d%m%y-%H%M%S`;
chop $opt_target;

GetOptions("help","version","target=s") || error();

# fix the directory prefix for target dir

$WD= `pwd`;
chop $WD;
$opt_target= $WD . '/' . $opt_target;

&main();

####
#### main
####

sub main
{
  my $REG_BASENAME = '[a-z0-9A-Z\-\_\+]+';
  my $REG_VERSION = '[0-9\.\-]+[a-z]?[0-9\.\-]+?(.alpha|.beta|.gamma|pre\d|[0-9\.\-a-z])?';
  my $target;

  if ($opt_version)
  {
    print "$0 version $VER by Jani Tolonen\n";
    exit(0);
  }
  usage() if ($opt_help);
  print error() if ($#ARGV == -1);

  `mkdir -p $opt_target`;
  $pec= $? >> 8;
  die "Couldn't make the target directory!\n" if ($pec);

  for ($i=0; $ARGV[$i]; $i++)
  {
    my $distfile= $ARGV[$i];
    my $dir;

    $dir= "mysql-copyright-";    
    $dir.= `date +%d%m%y-%H%M%S`;
    chop $dir;

    if (!(mkdir "$dir", 0700))
    {
      die "Couldn't make directory $dir!";
    }
    if (!(chdir "$dir"))
    {
      abort($dir, "Couldn't cd to $dir!");
    }
    # if the distfile is mysql-3.22.22-alpha.tar.gz, then
    # distname is 'mysql-3.22.22-alpha' and suffix '.tar.gz'
    if ($distfile =~ m/^($REG_BASENAME)([\-\_])
	($REG_VERSION){1}([\.\-\+])
	(.*)?$/xo) 
    {
      $distname= $1.$2.$3;
      $suffix= $5.$6;
      $newdistname= $1."com".$2.$3;
    }
    # find out the extract path (should be same as distname!)
    $destdir= `tar tvzf ../$distfile | head -1`;
    # remove leading crab
    $destdir =~ s/.*\d+:\d+:\d+[ ]//;
    # remove newline and slash from the end
    $destdir= substr($destdir, 0, -2);
    
    if ("$destdir" ne "$distname")
    {
      print "Destination directory (the directory that will be extracted\n";
      print "from the original distribution file) differs from the\n";
      print "distribution name! Are you sure you want to continue? (Y/N) [N]:";
      $ans= my_read(1);
      abort($dir, "Aborted!") if ("$ans" ne "Y" && "$ans" ne "y");
    }
    
    # everything should be ok, continue with extracting..
    `gtar xfz ../$distfile`;
    $pec= $? >> 8;
    abort($dir, "Extracting from tar failed!\n") if ($pec);

    # remove the 'PUBLIC' file from distribution and copy LICENSE
    # on the toplevel of the directory instead. file 'PUBLIC' shouldn't
    # exist in the new mysql distributions, but let's be sure..
    `rm -f $destdir/PUBLIC`;
    `cp -p $WD/Docs/LICENSE $destdir/`;
    
    # fix file copyrights
    &fix_usage_copyright();
    &add_copyright();
    
    # rename the directory with new distribution name
    `mv -f $destdir $newdistname`;
    
    # tar the new distribution
    `gtar cz -f $opt_target/$newdistname.tar.gz *`;
    $pec= $? >> 8;
    abort($dir, "Making new tar archive failed!\n") if ($pec);
  
    # remove temporary directory
    chdir "..";
    `rm -rf $dir/`;
  }
  exit(0);
}  

####
#### mysqld and MySQL client programs have a usage printed with --help.
#### This usage includes a copyright, which needs to be modified
####

sub fix_usage_copyright
{
  my @Cfiles = `find . -type f -name \"*.c*\"`;
  foreach my $Cfile (@Cfiles)
  {
    chop $Cfile;
    `replace \"This is free software,\\\\\\nand you are welcome to modify and redistribute it under the GPL license\" \"This is commercial software,\\\\nplease see the file LICENSE for details\" -- $Cfile`;
  }
}

####
#### change the copyright text in the beginning of the files
####

sub add_copyright
{
  my @files = `find . -type f -name "*"`;
  foreach my $file (@files)
  {
    chop $file;
    `$WD/Build-tools/mysql-copyright-2 $file`;
  }
}

####
#### read stdin
####

sub my_read
{
  ($length)= @_;                # Max allowed length for the string.

  $input= getc(STDIN);
  if($input eq "\n")
  {
    return "\n";
  }
  for($new_input= getc(STDIN); $new_input ne "\n" ;)
  {
    if(length($input) < $length)
    {
      $input.= $new_input;
    }
    $new_input= getc(STDIN);
  }
  return $input;
}

####
#### abort
####

sub abort
{
  my ($dir, $errstr)= @_;
  # remove newly made directory and it's contents
  print "$errstr\n";
  chdir "..";
  print "Removing directory $dir...\n";
  `rm -rf $dir`;
  exit(0);
}

####
#### usage
####

sub usage
{
  print <<EOF;
$0 version $VER by Jani Tolonen

Description: The program takes one or more MySQL distributions as an
argument(s), extracts them, changes the copyright text in the
distribution files and makes a new distribution with suffix "com" in
the basename to directory mysql-copyright-target-DATE, where the
command was issued. For example: mysql-3.23.18-beta.tar.gz ->
mysqlcom-3.23.18-beta.tar.gz. DATE is of form DDMMYY-HHMMSS. The
target directory can be changed with option
--target=... mysql-copyright consists of two perl programs, this one
and another, mysql-copyright-2.  Make sure the second part of the
script is available to the main script.

Usage: 
$0 [options] file1 [file2 file3...]

Options:
--help            Show this help and exit.
--target          Target directory for new distribution files.
                  '.' can be used for the current directory.
                  (Default: $opt_target)
EOF
  exit(0);
}

####
#### error
####

sub error
{
  if ($#ARGV == -1)
  {
    print "Too few arguments to $0!\n";
  }
  exit(1);
}