#! /usr/bin/perl

my $srcdir = $ENV{srcdir} || ".";

# get numbers from ChangeLog
open IN, "<$srcdir/ChangeLog" or die "error opening $srcdir/ChangeLog";
my $line = scalar(<IN>);
if ($line =~ /\d+\.\d+ \((NOT.*)\)/) {
  die "ChangeLog still bears $1 (line 1)";
}
if ($line !~ /^(\d+\.\d+):\s*/) {
  die "ChangeLog parse error (line 1)";
}
my $changelog_version = $1;

# get numbers from protobuf-c.h
open IN, "<$srcdir/src/google/protobuf-c/protobuf-c.h" or die "error opening $srcdir/src/google/protobuf-c/protobuf-c.h";
while (<IN>)
{
  if (/^\#define\s+PROTOBUF_C_MAJOR\s+(\d+)\s*$/)
    { $c_major = $1; }
  if (/^\#define\s+PROTOBUF_C_MINOR\s+(\d+)\s*$/)
    { $c_minor = $1; }
}
if (!defined $c_minor || !defined $c_major)
  { die "missing PROTOBUF_C_MINOR or PROTOBUF_C_MAJOR in protobuf-c.h" }
$c_version = "$c_major.$c_minor";

# get numbers from configure.ac
open IN, "<$srcdir/configure.ac" or die "error opening $srcdir/configure.ac";
my $line = scalar(<IN>);
die "first line of configure.ac did not match our expectations"
     unless $line =~ /AC_INIT\(\[protobuf-c\], \[(\d+\.\d+)\]\)/;
my $configure_version = $1;


if ($c_version ne $configure_version || $c_version ne $changelog_version)
{
  print STDERR <<"EOF";
Versions mismatched:
  from configure.ac      $configure_version
  from ChangeLog         $changelog_version
  from protobuf-c.h      $c_version
EOF
  exit(1);
}
exit(0);