-- Randal L. Schwartz, Perl hacker

The problem of this script is, of course, that not everyone uses the & convention for calling subroutines. One thing that comes to mind is flag "x" (1024) for the -D option to perl, which does a syntax tree dump. I have never seen its output, and I don't have perl compiled with -DDEBUGGING, but I wonder it that could be used to generate a more complete call tree.

The other option would be to run the script with "perl -d:DProf" (using the Devel::DProf module) and then use the call graph generated by dprofpp to generate the dot output. In this case, however, only the subroutines that got called during the execution are graphed.

Very interesting problem, in any case.

--ZZamboni

BUT ...

the ampersands are there.

More the the point, the module definitions are expanded:

   &MyLib:Storage::CVS($filename,$user,$version,$comment);

I made some improvements on the program, so it will handle the command line arguments and it will show the parent filename at each node. And there is no need to generate a PS image.

#!/opt/csw/bin/perl -
# Author : Rob G, The Netherlands
#          Based on script by: Valter Mazzola, txian@hotmail.com, Ital
+y
# Date   : 24/May/2012

# Purpose:
# ---> Generate a Graph-ical call tree for your *.pm perl module files
+.
# gra.pl assumes that:
# 1- you have defined sub(s) with  'sub myfunc {' with 'sub' at the be
+ginning of line.
# 2- you call your sub with the '&' and brackets, i.e.  &my_sub ();

# usage: 
# 1) generate the .dot text graph file definition  
#    perl gra.pl *.pm > myfile.dot
# 2) generate the graph using 'dot' executable ( http://www.research.a
+tt.com/sw/tools/graphviz/ )
#    dot -Tjpg myfile.dot -o myfile.jpg
# 3) display the graph
#    JPG viewer  

use File::DosGlob;

my $fc = 1; # a file counter to distingguish between multiple main-fil
+es

# first expand the command line arguments
@ARGV = map {
  my @g = File::DosGlob::glob($_) if /[*?]/;
  @g ? @g : $_;
} @ARGV;

# then loop through all files and exclude myself from the loop
for my $file (@ARGV) {
  if ($file ne $0) {
    open(my $fh, $file) or die "Can't open $file: $!\n";
    $cur_sub = "main".$fc; # used to show the parent of main subs
    $fc++;
    while (<$fh>) {
      if (/^sub\s+(.*?)\s*\{/) {
        $cur_sub = $1;
        $modules{$cur_sub} = $file;    
      }
      if (/\&([\d\w_]+)\s*\(/){
        $c_sub = $1;
        $n = 0;
        foreach $k (@{$called_subs{$cur_sub}}) {
          if ($c_sub eq $k) {
            $n = 1;
            last;
          }
        } 
        if ($n == 0) {
          push @{$called_subs{$cur_sub}}, $c_sub;
          $modules{$cur_sub} = $file;    
        }
      }
    }
    close $fh;
  }
}

print "digraph G {\n";
print "   page=\"44,68\";\n";                       # make sure the gr
+aph is large enough
print "   ratio=auto;\n";
print "   rankdir=LR;\n";                           # ) I prefer porta
+it
print "   orientation=portrait;\n";                 # )
print "   node[fontsize=10,fontname=\"Arial\"]\n";  # and another font
+name, fontsize

# first we define the label and shape of each node
# the label is contructed from the name of the sub and the name of the
+ parent file
# the shape for the main entries is different from the other nodes
#
# a side-effect: it will show all sub's that are not used too
while (($key, $value) = each (%modules)) {
  if (substr($key, 0, 4) eq "main") {
    print "   $key [shape=ellipse,label=\"main\\n($value)\"];\n";
  } else {
    print "   $key [shape=box,label=\"$key\\n($value)\"];\n";
  }
}

# then we define the paths between the nodes
foreach $k (keys(%called_subs)) {
  $ref_arr = $called_subs{$k};
  if (ref($ref_arr)) {
    foreach $y (@{$ref_arr}){
      print "   $k -> $y;\n";
    }
  }
}

print "}\n";
[download]