#!/usr/bin/perl
# perl_count - count physical lines of code in Perl programs.
# Usage: perl_count [-f file] [list_of_files]
#  file: file with a list of files to count (if "-", read list from stdin)
#  list_of_files: list of files to count
#  -f file or list_of_files can be used, or both

# Physical lines of Perl are MUCH HARDER to count than you'd think.
# Comments begin with "#".
# Also, anything in a "perlpod" is a comment.
# See perlpod(1) for more info; a perlpod starts with
# \s*=command, can have more commands, and ends with \s*=cut.
# Note that = followed by space is NOT a perlpod.
# Although we ignore everything after __END__ in a file,
# we will count everything after __DATA__; there's arguments for counting
# and for not counting __DATA__.

# What's worse, "here" documents must be COUNTED AS CODE, even if
# they're FORMATTED AS A PERLPOD.  Surely no one would do this, right?
# Sigh... it can happen. See perl5.005_03/pod/splitpod.

# This is part of SLOCCount, a toolsuite that counts
# source lines of code (SLOC).
# Copyright (C) 2001-2004 David A. Wheeler.
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
# 
# To contact David A. Wheeler, see his website at:
#  http://www.dwheeler.com.
# 
# 

$total_sloc = 0;

# Do we have "-f" (read list of files from second argument)?
if (($#ARGV >= 1) && ($ARGV[0] eq "-f")) {
  # Yes, we have -f
  if ($ARGV[1] eq "-") {
    # The list of files is in STDIN
    while (<STDIN>) {
      chomp ($_);
      &count_file ($_);
    }
  } else {
    # The list of files is in the file $ARGV[1]
    open (FILEWITHLIST, $ARGV[1]) || die "Error: Could not open $ARGV[1]\n";
    while (<FILEWITHLIST>) {
      chomp ($_);
      &count_file ($_);
    }
    close FILEWITHLIST;
  }
  shift @ARGV; shift @ARGV;
}
# Process all (remaining) arguments as file names
while ($file = shift @ARGV) {
  &count_file ($file);
}

print "Total:\n";
print "$total_sloc\n";

sub count_file {
  my ($file) = @_;
  my $sloc = 0;
  my $isinpod = 0;
  my $heredocument = ""; # If nonempty, identifies the ending marker.

  open (FILE, $file);
  while (<FILE>) {
    s/#.*//;  # Delete leading comments.
    if ($heredocument and m/^\s*$heredocument/) {
     $heredocument = ""; # finished here doc.
    } elsif (m/<<\s*["']?([A-Za-z0-9_-]+)["']?[;,]\s*$/) {
      # Beginning of a here document.
      $heredocument = $1;
    } elsif (!$heredocument && m/^\s*=cut/) {  # Ending a POD?
      if (! $isinpod) {
        print stderr "cut without pod start in file $file line $.\n";
      }
      s/.*//;  # Don't count the cut command.
      $isinpod = 0;
    } elsif (!$heredocument && m/^\s*=[a-zA-Z]/) { # Starting continuing a POD?
      # Perlpods can have multiple contents, so it's okay if $isinpod == 1.
      # Note that =(space) isn't a POD; library file perl5db.pl does this!
      $isinpod = 1;
    } elsif (m/^__END__/) {  # Stop processing this file on __END__.
      last;
    }
    if ((! $isinpod) && (m/\S/)) { $sloc++;}
  }
  # Show per-file & total; reset $isinpod per file.
  print "$sloc $file\n";
  $total_sloc += $sloc;
  $sloc = 0;
  if ($isinpod) {
    print stderr "pod without closing cut in file $file\n";
  }
  # Reset state:
  $isinpod = 0;
  $heredocument = "";
  close (FILE);
}

# The following is POD documentation; it should not be counted:
=head1 Test
=head2 testing
=cut

__END__
# The following should not be counted in a line-counting program:
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";
print "Hello!\n";