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#!/usr/bin/perl -w
use Data::Dumper;

my $targ = (@ARGV) ? join(' ',@ARGV) : 'miniperl' ;

my $work = 1;
while ($work)
 {
  open(PIPE,"make $targ 2>&1 |") || die "Cannot open pipe to make:$!";
  my %fix;
  while (<PIPE>)
   {
    if (/^(.*):(\d+):\s+\`(\w+)'\s+undeclared/ && -f $1 )
     {
      my ($file,$line,$var) = ($1,$2,$3);
      $fix{$file} = [] unless exists $fix{$file}; 
      push(@{$fix{$file}},[$line => $var]) unless ($var =~ /^PL_/ || $file =~ /\.h$/);
     }
    print;
   }
  close(PIPE);
  warn "Make returned $?\n";
  last unless $?;
  my $changed = 0;
  foreach my $file (keys %fix)
   {          
    my @ar = sort( { $a->[0] <=> $b->[0] } @{delete $fix{$file}});
    my @miss;
    my $fixed = 0;
    unless (-w $file)
     {
      system("d4","edit",$file);
     }             
    @ARGV = ($file);
    $. = 0;
    local $^I = '.sav';
    while (<>)
     {
      while (@ar && $. == $ar[0][0])
       {
        my ($line,$var) = @{shift(@ar)};
        if (s/\b$var\b/PL_$var/)
         {
          warn "$file:$line: FIX $var\n"; 
          $fixed++;
          $changed++;
         }
        else
         {
          push(@miss,[$line,$var,$_]);
         }
       }
      print;
     }
    unless ($fixed)
     {
      rename("$file$^I",$file);
      if (@miss)
       {
        while (@miss)
         {
          my ($line,$var,$txt) = @{shift(@miss)};
          warn "$file:$line:$var | $txt";
         }
       }
     }    
   }
  last unless $changed;
 }