count_extensions

#!/usr/bin/perl -w

# Read from standard input a list of filenames, and
# report a sorted list of extensions and filenames
# (most common ones first).

# The format is "name count", where "count" is the number of appearances.
# "name" usually begins with a "." followed by the name of the extension.
# In the case where the filename has no extension, the name begins with "/"
# followed by the entire basename.

# 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.
# 
# 

%extensions = ();

while (<>) {
   if (m/\.([^.\/]+)$/) {
      $type = $1;
      chomp($type);
      $type = ".$type";
      if (defined($extensions{$type})) { $extensions{$type}++; }
      else                             { $extensions{$type} = 1; }
   } elsif (m!/([^/]+)$!) {
      $filename = $1;
      chomp($filename);
      $filename = "/$filename";
      if (defined($extensions{$filename})) { $extensions{$filename}++; }
      else                                 { $extensions{$filename} = 1; }
   }
}

foreach $entry (sort {$extensions{$b} <=> $extensions{$a}} keys %extensions) {
  print "${entry}  $extensions{$entry}\n";
}