#!/usr/bin/perl

#
# Perl script to beautify and enhance RTEMS configure.in
#
# Reads from stdin and writes to stdout
#
# usage: 
# acpolish <configure.in >configure.in~
# mv configure.in~ configure.in
#
# ATTENTION: This file contains embedded tabs

my $nl_seen = 0 ;

# find a relative up-path to a file $file, starting at directory $pre
sub find_file
{
  my $pre = $_[0] ;
  my $file= $_[1] ;

  my $top = "." ;
  if (not "$pre") { $pre = "." ; }

  for ( $str = "$pre" . "/" . "$top" ;
    ( -d "$str" ) ;
    $str = "$pre" . "/" . "$top" )
  {
    if ( -f "${str}/${file}" )  
    {
      return $top ; 
    }
    if ( "$top" eq "." )
    {
      $top = ".." ;
    }
    else
    {
      $top .= "/.." ;
    }
  } ;
  die "Can't find file ${file}\n" ;
}

# find relative up-path to configure.in
my $rtems_cfg = find_file(".","VERSION");


while( <> )
{ 
  if ( /^[ 	]*$/o )
  {
    $nl_seen = $nl_seen+1;
  }

  if ( /^[ 	]*AC_CONFIG_AUX_DIR\(.*\)[ 	]*$/o )
  {
    print "AC_CONFIG_AUX_DIR($rtems_cfg)\n" ;
  }
  elsif ( /^[ 	]*RTEMS_TOP\(.*\)[ 	]*$/o )
  {
    print "RTEMS_TOP($rtems_cfg)\n" ;
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_POSIX_API\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_ITRON_API\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_HWAPI\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_USE_MACROS\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_MULTIPROCESSING\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_RDBG\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[\s\t]*AC_SUBST\(RTEMS_USE_OWN_PDIR\)[ 	]*$/o ) 
  { # obsolete option
    #remove the line
  }
  elsif ( /^[\s\t]*RTEMS_ENABLE_GMAKE_PRINT[     ]*$/o ) 
  { # obsolete macro
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_HAS_NETWORKING\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_LIBC_DIR\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(PROJECT_ROOT\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*AC_SUBST\(RTEMS_GAS_CODE16\)[ 	]*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*PROJECT_ROOT[ 	]*=.*$/o ) 
  {
    #remove the line
  }
  elsif ( /^[ 	]*$/o )
  {
    print "$_" if $nl_seen < 2 ;
  }
  else
  {
    print "$_" ;
    $nl_seen = 0;
  }
} # while

;1