#!/usr/bin/perl

# use strict 'subs' ;
# use strict 'vars' ;
# use strict 'refs' ;

# use strict ;

#
# Perl script to beautify and enhance RTEMS autoconf Makefile.ins
#
# Reads from stdin and writes to stdout
#
# usage: 
# acpolish <Makefile.in >Makefile.in~
# mv Makefile.in~ Makefile.in
#
# Note: This tool is not indented to be exported from the source-tree
#

if ( -f "Makefile.am" )
{
  # Refuse to work on Makefile.ins generated from automake;
  # redirecting STDOUT to Makefile.in will trash the Makefile.in ;-

  die "acpolish must not be run in automake directories" ;
}

my $experimental = 0 ; # enable experimental/unsafe features
my $verbose = 0 ;
my $build_pgms_seen = "" ;
my $make_exe_seen = 0 ;
my $install_seen = 0 ;
my $top_builddir = "";
my $subdir = "";
my @installdirs = () ;

my @pieces = () ;
my @files = () ;
my @variants = () ;
my @vars = () ;

sub print_macro($$)
{
  my $line = $_[0] ;
  my $input  = $_[1] ;
  $input =~ s/\\\\/ /g;
  my @l = split(' ',$input);

  foreach (@l) { 
    if ( ( length($line) + length($_) ) < 76 )
    {
          $line .= " $_";
    }
    else
    {
           print "$line \\\n";
           $line = "    $_" ; 
    }
  }
  print "$line\n" ;
}

# Strip off duplicate entries from a list
sub purge($)
{
  my $list = $_[0] ; # Reference to list !
  my (@tmp) = () ;

  foreach my $l ( @{$list} )
  {
    my $i = 1 ;
    foreach my $t (@tmp)
    {
      if ( $t eq $l )
      {
        $i = 0 ;
        last ;
      }
    }
    push @tmp,$l if ($i) ;
  }

  @{$list} = @tmp ;
}

sub find_root
{
  $top_builddir = "." ;
  $subdir="";
  my $pwd = `pwd`; chomp $pwd;
  $pwd .= "/" ;
  my $len ;

  if ( -f "configure.in" )  { return $top_builddir ; }
  my $i = rindex($pwd,'/');

  $len = $i;
  $pwd = substr($pwd,0,$len);
  $i = rindex($pwd,'/');
  $subdir = substr($pwd,$i+1,$len - 1);
  $top_builddir = ".." ;  

  while( -d "$top_builddir" ) 
  {
    if ( -f "${top_builddir}/configure.in" )  
    { 
      return $top_builddir ; 
    }
    $len=$i;
    $pwd = substr($pwd,0,$len);
    $i = rindex($pwd,'/');
    $subdir = substr($pwd,$i+1,$len - 1) . "/$subdir";
    $top_builddir .= "/.." ;  
  } ;
  die "Can't find configure.in\n" ;
}

find_root();

my @buffer = () ;

sub subst_line
{
# substitute obsolete variables
  if ( /^([^\s]*)[\s]+$/o )
  { # strip trailing spaces
    $_ = "$1\n";
  }
  if ( /^(.*)MKLIB(.*)$/o )
  {
    s/MKLIB/RANLIB/g ;
  }
  if ( /^(.*)\$\(INSTINCFLAGS\)(.*)$/o )
  {
    s/\$\(INSTINCFLAGS\)/-m 644/g ;
  }
  if ( /^(.*)ASM(_FILES|_PIECES|_O_FILES)(.*)$/o )
  {
    s/ASM_FILES/S_FILES/g ;
    s/ASM_PIECES/S_PIECES/g ;
    s/ASM_O_FILES/S_O_FILES/g ;
    print STDERR "ASM: $_"  if ( $verbose > 0) ;
  }
  if ( /^(.*)MP_PIECES(.*)$/o )
  { # HACK: this is not always correct
    s/MP_PIECES/MP_C_PIECES/g ;
    print STDERR "MP_PIECES: $_"  if ( $verbose > 0 );
  }
  if ( /^(.*)\$\(RTEMS_BSP\)(.*)$/o )
  {
    s/\$\(RTEMS_BSP\)/\@RTEMS_BSP\@/g ;
  }
  if ( /^(.*)\$\(RTEMS_ROOT\)\/mkinstalldirs(.*)$/o )
  {
    $_ = "$1\$\(mkinstalldirs\)$2\n" ;
  }
  if ( /^(.*)\$\{(.*)_FILES\}(.*)$/o )
  {
    $_ = "$1\$\($2_FILES\)$3\n" ;
  }
  if ( /^(.*)\$\{(.*)_PIECES\}(.*)$/o )
  {
    $_ = "$1\$\($2_PIECES\)$3\n" ;
  }
  if ( /^(.*)\$\(PROJECT_ROOT\)\/\@RTEMS_BSP\@\/lib\/include(.*)$/o )
  {
    $_ = "$1\$\(PROJECT_INCLUDE\)$2\n" ;
  }
  if ( /^(.*)\$\{PROJECT_RELEASE\}(.*)$/o )
  {
    $_ = "$1\$\(PROJECT_RELEASE\)$2\n" ;
  }
  if ( /^(.*\$\(INSTALL_[A-Z]+\))[\s]+-m[\s]+([54])([0-9][0-9].*)$/o )
  {
    my $v = $2 + 2 ;
    $_ = "$1 -m $v$3\n" ;
  }
  if ( /^H_FILES[\s]*=[\s]*\$\(wildcard[\s]+\$\(srcdir\)\/\*\.h\)[\s]*$/o )
  {
     my $files =`ls *.h 2>/dev/null`;
     print STDERR "WARNING: Replacing \"\(wildcard... in $_\n" ;
     $line = "H_FILES =";
     @l = split(' ',$files) ;
     foreach(@l) { $line .= " \$\(srcdir\)/$_"; }
     $line .= "\n" ;
     $_ = "$line" ;
  }
  if ( /^.*\$\(make\-exe\).*$/o )
  {
    $make_exe_seen = 1 ;
  }
  if ( /^.*\$\(INSTALL_(DATA|SCRIPT|PROGRAM)\)(.*)$/o )
  {
    $install_seen = 1 ;
  }
}

{
# 1st PASS: 
# * Read input file
# * concatenate multiple lines
# * Remove obsolete variables

  my @ibuf = () ;
  my $line = "" ;

  while ( <> )
  {
    &subst_line ;
    if ( /^(#.*)$/o )
    { # preserve comments
      $line = "$_" ;
      push @ibuf, $line ;
      $line = "" ;
    }
    elsif ( /^.*\\$/o )
    { # multilines
      chop ;
      $line .= "$_\\" ;
    }
    else
    {
      $line .= "$_" ;
      push @ibuf, $line ;
      $line = "" ;
    }
  }
  @buffer = @ibuf;
}

{
# 2nd PASS:
# * remove automatically generated lines
# * process some selected make rules
  my $line = "" ;
  my @tbuf = () ;
  foreach (@buffer)
  {
    if ( /^[\t](.*)$/o )
    { # make rule production
      my $line = $1 ;
      tr/\\/ / ;
      my @l = split(/;/,$_);      
      foreach (@l)
      { # try to get installation directories
        if ( /^.*\$\(mkinstalldirs\).*\s\$\(INSTALLDIRS\)$/o )
        {
        }
        elsif ( /^.*\$\(mkinstalldirs\).*\s([^\s]+)$/o )
        {
          push @installdirs, "$1" ;
        }
        elsif ( /^.*\$\(INSTALL_CHANGE\).*\s([^\s]+)$/o )
        {
          push @installdirs, "$1" ;
        }
      }
      push @tbuf, "§3$line"
    }
    elsif ( /^[\s]*\#.*$/o )
    { # comment
      push @tbuf, "$_" ;
    }
    elsif ( /^[\s]*([A-Z_]*)_FILES[\s]*\=[\s]*(.*)$/o )
    { # *_FILES = ... Macros
      if ( /^[\s]*([A-Z_]*_|)(CC|C|EQ|H|I|O|S|X)_FILES[\s]*\=[\s]*(.*)$/o )
      {
#        print STDERR "FILES: <$1>--<$2>--<$3>\n" ;
        my $f = "$1$2_FILES" ;
        ${"var_$f"}="$3" ;
        if ( ( $experimental > 0 ) 
          and ( ( "$2" eq "C" ) or ( "$2" eq "CC" ) or ( "$2" eq "S" )
	  or ( "$2" eq "I" ) or ( "$2" eq "H" ) ) )
        {
          my $p = "$1$2_PIECES" ;
	  if ( not defined ${"var_$p"} )
          {
            print STDERR "ADDING $p\n" ;
            ${"var_$p"} = "" ;
            push @tbuf, "§4$p\n" ;
            push @pieces, "$p" ;
          }
        }
        # place a marker
        push @tbuf, "§4$f\n" ;
        push @files, "$f" ;
      }
      else
      { # found a bug
        print STDERR "UNKNOWN _FILES: $_\n" ;
        my $f = "$1_FILES" ;
        ${"var_$f"}="$2" ; 
        # place a marker
        push @tbuf, "§4$f\n" ;
        push @files, "$f" ;
      }
    }
    elsif ( /^[\s]*([A-Z_]*)_PIECES[\s]*\=[\s]*(.*)$/o )
    { # *_PIECES = ... Macros
      if ( /^[\s]*([A-Z][A-Z0-9_]*_|)(CC|C|EQ|H|I|O|S|X|REL)_PIECES[\s]*\=[\s]*(.*)$/o )
      {
        my $p = "$1$2_PIECES" ;

	if ( not defined ${"var_$p"} )
        {
          ${"var_$p"} = "$3" ;
          push @tbuf, "§4$p\n" ;
          push @pieces, "$p" ;
        }
        else
        {
          ${"var_$p"} .= " $3" ; 
        }
      }
      elsif ( /^[\s]*(BSP|CPU|GENERIC)_PIECES[\s]*\=[\s]*(.*)$/o )
      { # Explicit exceptions from the *_PIECES naming conventions
        # They should better be replaced in future
        my $p = "$1_PIECES" ;
        ${"var_$p"}="$2" ; 
        # place a marker
        push @tbuf, "§4$p\n" ;
        push @pieces, "$p" ;
      }
      else
      { # found a bug
        print STDERR "UNKNOWN _PIECES: $_\n" ;
        my $p = "$1_PIECES" ;
        ${"var_$p"}="$2" ; 
        # place a marker
        push @tbuf, "§4$p\n" ;
        push @pieces, "$p" ;
      }
    }
    elsif ( /^[\s]*([A-Z_]+)_PIECES_([^\s]+)_V[\s]*\=[\s]*(.*)$/o )
    { # *_PIECES_.._V = ... Macros
      if ( /^[\s]*([A-Z][A-Z0-9_]*_|)(CC|C|EQ|H|I|O|S|X|REL)_PIECES_([^\s]+)_V[\s]*\=[\s]*(.*)$/o )
      {
        my @l = split(/_/,$3);
        my $v = "$1$2-$#l" ;
	if ( not defined @{"variants_$v"} ) { push @variants, "$v" ; }

        my $p = "$1$2_PIECES_$3_V" ;
        push @{"variants_${v}"}, "$p" ;

        ${"var_$p"}="$4" ; 
        # place a marker
        push @tbuf, "§4$p\n" ;
        push @pieces, "$p" ;
      }
      else
      { # found a bug
        print STDERR "UNKNOWN _PIECES: $_\n" ;
        my $p = "$1_PIECES" ;
        ${"var_$p"}="$2" ; 
        # place a marker
        push @tbuf, "§4$p\n" ;
        push @pieces, "$p" ;
      }
    }
    elsif ( /^[\s]*([^\s+=]+)[\s]*\=[\s]*(.*)$/o )
    { # makefile variable
      if ( ( "$1" eq "subdir" )
        or ( "$1" eq "top_srcdir" )
	or ( "$1" eq "top_builddir" )
	or ( "$1" eq "RTEMS_ROOT" )
        or ( "$1" eq "PROJECT_ROOT" )
	or ( "$1" eq "INSTALL" )
	or ( "$1" eq "PACKHEX" )
        or ( "$1" eq "INSTALL_CHANGE" )
	or ( "$1" eq "mkinstalldirs" )
      )
      {
        print STDERR "REMOVE: $1\n" if $verbose ;
      }
      elsif ( "$1" eq "srcdir" )
      { # place marker
        push @tbuf, "§0\n";
      }
      elsif ( "$1" eq "INSTALLDIRS" )
      { # process the block
	my $input = $2 ;
	$input =~ s/\\\\/ /g ;
        my @l = split(' ',$input);
        foreach (@l)
        {
          if ( /[\s]*([^\s]+)[\s]*$/o )
          {
            push @installdirs, "$1" ;
          }
        }
      }
      else
      {
# print STDERR "MACRO: <$1> = <$2>\n";
        my $p = "$1" ;
        ${"var_$p"}="$2" ; 
        # place a marker
        push @tbuf, "§4$p\n" ;
        push @vars, "$p" ;
      }
    }
    elsif ( /^[\s]*([^\s+=]+)[\s]*\+\=[\s]*(.*)$/o )
    { # makefile variable addition
# print STDERR "MACRO: <$1> += <$2>\n";
        my $p = "$1" ;
        ${"var_$p+"}="$2" ; 
        # place a marker
        push @tbuf, "§5$p\n" ;
        push @vars, "$p+" ;
    }
    elsif ( /^[\s]*(\@[^\s]+\@)$/o )
    { # autoconf variable
      if ( "$1" eq "\@SET_MAKE\@" )
      {
      }
      else
      {
        push @tbuf, "$1\n" ;
      }
    }
    elsif ( /^[\s]*include[\s]+(.*)$/o )
    { # include line
      push @tbuf, "$_" ;
      if ( /^include[\s\t]*.*(directory|leaf|lib)\.cfg.*$/o )
      {
        push @tbuf, "§1\n" ;
        push @tbuf, "PACKHEX = \@PACKHEX\@\n" if ( $make_exe_seen == 1 ) ;
        push @tbuf, "§2\n" ;
      }
    }
    elsif ( /^[\s]*(ifeq|ifneq|else|endif)[\s]+(.*)$/o )
    { # gmake conditionals
      # Most of them are removed, but we still have some :-
      push @tbuf, "$1 $2\n" ;
    }
    elsif ( /^[\s]*([^:]+)[\s]*(:[:]*)[\s]*(.*)$/o )
    {
      if ( "$2" eq "::" )
      {
        # Warn about "::"-rules
        # Will be silently removed below.
        print STDERR "WARNING: Removing \"::\" in RULE $_\n" ;
      }

      if ( ( "$1" eq "Makefile" )
        or ( "$1" eq "\$\(INSTALLDIRS\)" ) )
      { # delete entry 
        shift @buffer ;
      }
      elsif ( ( "$1" eq "all" ) 
        or    ( "$1" eq "preinstall" ) )
      {
        # Note the dependencies
        # Not yet exploited, but could be useful for dependency
	# tracking in future
        if ( defined ${"var_$1"} )
          { ${"var_$1"} .= " $3" ; }
        else 
          { ${"var_$1"} = "$3" ; }
        push @tbuf, "$1: $3\n" ;
      }
      else
      { # make rule
        push @tbuf, "$1: $3\n" ;
      }
    }
    elsif ( /^[\s]*$/o )
    { # empty line
      push @tbuf, "\n" ;
    }
    else
    {
      die "PASS 2: Unhandled $_" ;
    }
  }
  @buffer = @tbuf ;
  purge \@installdirs ;
  purge \@pieces ;
}

# A fragment to debug conditionals
#foreach( @variants )
#{
#  my $v = $_ ;
#  print STDERR "VARIANT: $v\n";
#  foreach (@{"variants_${v}"})
#  {
#    print STDERR "* $_\n;" ;
#  }
#}

# sanity check on *_FILES macros
# too fragile for the time being,
# therefore disabled by default
if ( $experimental > 1 )
{
  foreach( @files )
  {
    my $file = "$_" ;
    my $line = ${"var_$_"} ;
    $line =~ tr /\\/ /;
    my @l = split(' ',$line);
    my @o = () ;
    foreach (@l)
    {
      if ( /^([^\.]+)\.([a-z]+)$/o )
      {
        print STDERR "$file: *.$2 in $_\n" ;
      }
      elsif ( /^\$\(.*\)$/o )
      {
        print STDERR "$file: REF: $_\n" ;
      }
      else
      {
        print STDERR "$file: UNHANDLED: $_\n" ;
      }
    }
  }
}

# print STDERR "PASS 2: @buffer" ;

{
# PASS 3:
# * output to new Makefile
# * prettyprint newlines

  my $nl_seen = 0 ;
  foreach ( @buffer )
  {
    if ( /^$/o )
    {
      $nl_seen++ ;
      print "\n" if ( $nl_seen < 2 );
    }
    elsif ( /^\§0$/o )
    {
      print "\@SET_MAKE\@\n" ;
      print "srcdir = \@srcdir\@\n" ;
      print "top_srcdir = \@top_srcdir\@\n" ; 
      print "top_builddir = $top_builddir\n" ;
      print "subdir = $subdir\n" if "$subdir" ;
      print "\nRTEMS_ROOT = \@RTEMS_ROOT\@\n" ;
      print "PROJECT_ROOT = \@PROJECT_ROOT\@\n\n" ;
      $nl_seen = 1 ;
    }
    elsif ( /^\§1$/o )
    {
      print "\n" ;
      print "INSTALL = \@INSTALL\@\n" if ( $install_seen > 0 );
      print "INSTALL_CHANGE = \@INSTALL_CHANGE\@\n" ;
      $nl_seen = 0 ;
    }
    elsif ( /^\§2$/o )
    { # Handle installdirs related items 
      if ( $#installdirs >= 0 )
      {
        print "mkinstalldirs = \$(SHELL) \$(top_srcdir)/\@RTEMS_TOPdir\@/mkinstalldirs\n\n" ;
        my $line = join( ' ',@installdirs );
        print_macro "INSTALLDIRS =", $line ;
	print "\n\$(INSTALLDIRS):\n\t\@\$(mkinstalldirs) \$(INSTALLDIRS)\n\n" ;
	$nl_seen = 1 ;
      }
    }
    elsif ( /^\§3(.*)$/o  )
    { # pretty print a shell script fragment/make production
      my @l = split(/\\\\/,$1);
      if ( $#l >= 0 ) { my $i = shift @l ; print "\t$i"; }
      foreach( @l ) { print "\\\n$_"; }
      print "\n" ;
      $nl_seen = 0 ;
    }
    elsif ( /^\§4(.*)$/o  )
    { # pretty print a make variable
      print_macro "$1 =", ${"var_$1"} ;
      $nl_seen = 0 ;
    }
    elsif ( /^\§5(.*)$/o  )
    { # pretty print an addition to a make variable
      print_macro "$1 +=", ${"var_$1+"} ;
      $nl_seen = 0 ;
    }
    else
    {
      $nl_seen = 0 ;
      print "$_" ;
    }
  }
}

# Add rules for config.status generated files
if ( "$build_pgms_seen" )
{
print "%: \$(srcdir)/%.in \$(top_builddir)/config.status\n" ;
print "	cd \$(top_builddir) \\\n" ;
print "	 && CONFIG_FILES=" ;
print "\$(subdir)/" if ( "$subdir" );
print "\$@ CONFIG_HEADERS= \$(SHELL) ./config.status\n";
}
else
{
print "Makefile: \@MAINTAINER_MODE_TRUE\@ \$(srcdir)/Makefile.in \$(top_builddir)/config.status\n" ;
print "	cd \$(top_builddir) \\\n" ;
print "	 && CONFIG_FILES=" ;
print "\$(subdir)/" if ( "$subdir" );
print "\$@ CONFIG_HEADERS= \$(SHELL) ./config.status\n";
}

;1