#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Std;

our $VERSION = '0.8.6';

$Getopt::Std::STANDARD_HELP_VERSION = 'true';

my $help = '
syntax:
wcpercent [--help]

wcpercent [-d <wordcount path>] [ -f <filename> ] [-g <goal>]
[ -l <logs path> ] [<wordcount target>] . . .

--help
    prints this help text and exits: invoking the help argument causes all
    other arguments to be disregarded by this utility

-d <wordcount path>
    takes a path relative to the current working directory, or an absolute
    path, as the directory on which the utility operates (deprecated: use
    the <wordcount target> arguments instead, as this is included only for
    backward compatibility)

-f <filename>
    takes a path and filename to specify the logfile that should be used
    by wcpercent instead of the default, ~/wcrecord.txt -- this option
    disables the -l option

-g <goal>
    uses the wordcount goal argument provided to calculate percentage of
    the goal that has been achieved thus far

-l <logs path>
    takes a path relative to the current working directory, or an absolute
    path, as the directory in which logfiles are to be generated

-n
    this option turns off logging

<wordcount target>
    after all options, you may specify as many directory and filename paths
    as you wish, separated by spaces -- both directories and specific files
    may be specified here: supplying such arguments automatically disables
    the -d option

description:  wcpercent (aka "word count percent") returns a percentage
value indicating how much of a wordcount goal you have reached, based on
the contents of a specified directory.  The default directory path is
~/nanowrimo, and the default wordcount goal is 50,000 words.  If no
arguments are supplied when the script is called, these are the values that
will be used.  The file used as the logfile (by default, ~/wcrecord.txt)
must be created before this script is run -- perhaps by use of the touch
utility at the shell.

credits:  Chad L. Perrin (author)
contact:  http://apotheon.org/contact.php?contact=webmaster

license:  This software may be distributed under terms of the CCD CopyWrite
license.  See the webpage at http://ccd.apotheon.org for licensing details.

';

our ($opt_d, $opt_f, $opt_g, $opt_l, $opt_n);
getopts('d:g:f:l:n');
defaults();

my $total;
if ($ARGV[0]) {
  $total = wc();
} else {                                  # legacy support -- to be removed
  $total = `wc -w $opt_d |grep total`;
  $total =~ s/\s//g;
  $total =~ s/total//;
}

my $goal = $opt_g / 100;
my $percent = $total / $goal;
if ($percent <= 100) {
  print $percent;
} else {
  print 100;
}

my @log;
if (-e $opt_f) {
  my @logfile;
  open(LOGFILE, "<$opt_f");
  push(@logfile, $_) while <LOGFILE>;
  @log = split(/\s/,$logfile[-1]);
}

push @log, '';

my $date = localtime;
my $newlog = "$total :: $percent :: $date\n";
logging() unless ($log[0] eq $total);


### subroutines ###

sub logging {
  exit if $opt_n;
  open(WCRECORD, ">>$opt_f") || open(WCRECORD, ">$opt_f");
  print WCRECORD $newlog;
  close(WCRECORD);
}

sub defaults {
  my @localtime = localtime;
  my $odate = ($localtime[5] + 1900) . ($localtime[7] + 1);
  
  $opt_d ||= '~/nanowrimo';
  $opt_d .= '/*';

  $opt_f ||= $opt_l . $odate;

  $opt_g ||= '50000';

  $opt_l ||= '~/wclog';
  $opt_l .= '/';
}

sub wc {
  my $words = 0;
  while (<>) {
    my @words = split(' ', $_);
    $words++ foreach @words;
  }

  return $words;
}

sub HELP_MESSAGE {
  print $help;
}