A quick PHP script to count the total number of words written in your Day One journal file.

count.php

<?PHP
	$journal_fn = $argv[1];
	$entries_dir = $journal_fn . '/entries/';
	
	$entries = scandir($entries_dir);
	
	print_r($entries);

	$total_words = 0;
	
	foreach($entries as $e)
	{
		if(substr($e, strlen($e) - 8) == '.doentry')
		{
			$fn = $entries_dir . '/' . $e;
			$xml = simplexml_load_file($fn);
			$text = $xml->dict->string;
			echo $fn . ' - ' . str_word_count((string)$text) . "\n";
			$total_words += str_word_count((string)$text);
		}
	}
	
	echo "Total words: $total_words\n";