This is very neat. I have made a patch (see below) that:

• Makes it ignore POD lines.
• Makes it deal with multi-line @ISA declarations such as:

  @ISA=qw(class1
          class2);
  

  Of course, the only foolproof way to get @ISA would be to load the package and examine its value, but this seems to work OK.

For an example of a graph generated by this program, see this graph, which corresponds to the implementation of this project. :-)

--ZZamboni

Here's the patch:

--- ingraph.pl.orig     Sun Jun 10 16:52:08 2001
+++ ingraph.pl  Sun Jun 10 17:00:00 2001
@@ -86,16 +86,31 @@
  STDERR->print("processing $file\n") if $opts{v};
  my $f = IO::File->new($file) or warn "can't open $file: $!\n", next;
  my ($package, @isa);
+ my $pod=0;
  while (<$f>)
  {
+  if (/^=cut/) {
+   $pod=0;
+   next;
+  }
+  if (/^=[a-zA-Z]+/) {
+   $pod=1;
+   next;
+  }
+  next if $pod;
   if (/^\s*package\s+([[:word:]:]+)\s*;/)
   {
    $package = $1;
    next;
   }
-  if (/@(?:([[:word:]:]+)::)?ISA\s*=\s*(.*)\s*;/)
+  if (/@(?:([[:word:]:]+)::)?ISA\s*=\s*(.*)\s*/)
   {
-   @isa = eval $2;
+   my $tmp=$2;
+   while (!/;/) {
+     $_=<$f>;
+     $tmp.=$_;
+   }
+   @isa = eval $tmp;
    if ($@) { warn "Unparseable \@ISA line: $_"; next }
    $package = $1 if defined($1);
    STDERR->print("package=$package, \@ISA=", join(',', @isa), "\n") i
+f $opts{v};
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