Add option for minimum required OP length

(Conflicts with lainchan and clean-up by Discomrade)

inc/config.php

@@ -499,6 +499,8 @@
 	$config['max_body'] = 1800;
 	// Minimum post body length.
 	$config['min_body'] = 0;
+	// Minimum post body length for OPs.
+	$config['min_body_op'] = 0;
 	// Maximum number of post body lines to show on the index page.
 	$config['body_truncate'] = 15;
 	// Maximum number of characters to show on the index page.
@@ -1139,8 +1141,10 @@
 	$config['error']['bot']			= _('You look like a bot.');
 	$config['error']['referer']		= _('Your browser sent an invalid or no HTTP referer.');
 	$config['error']['toolong']		= _('The %s field was too long.');
-	$config['error']['toolong_body']	= _('The body was too long.');
-	$config['error']['tooshort_body']	= _('The body was too short or empty.');
+	$config['error']['toolong_body']	= _('Post can\'t be longer than %d characters long.');
+	$config['error']['tooshort_body']	= _('Post must be at least %d characters long.');
+	$config['error']['tooshort_body_op']	= _('OP must be at least %d characters long.');
+	$config['error']['no_body']		= _('The body was too short or empty.');
 	$config['error']['noimage']		= _('You must upload an image.');
 	$config['error']['toomanyimages'] = _('You have attempted to upload too many images!');
 	$config['error']['nomove']		= _('The server failed to handle your upload.');

post.php

@@ -601,7 +601,7 @@ if (isset($_POST['delete'])) {
 		if (!($post['has_file'] || isset($post['embed'])) || (($post['op'] && $config['force_body_op']) || (!$post['op'] && $config['force_body']))) {
 			$stripped_whitespace = preg_replace('/[\s]/u', '', $post['body']);
 			if ($stripped_whitespace == '') {
-				error($config['error']['tooshort_body']);
+				error($config['error']['no_body']);
 			}
 		}
 	
@@ -743,9 +743,11 @@ if (isset($_POST['delete'])) {
 		if (mb_strlen($post['subject']) > 100)
 			error(sprintf($config['error']['toolong'], 'subject'));
 		if (!$mod && mb_strlen($post['body']) > $config['max_body'])
-			error($config['error']['toolong_body']);
+			error(sprintf($config['error']['toolong_body'], $config['max_body']));
 		if (!$mod && mb_strlen($post['body']) > 0 && (mb_strlen($post['body']) < $config['min_body']))
-			error($config['error']['tooshort_body']);
+			error(sprintf($config['error']['tooshort_body'], $config['min_body']));
+		if (mb_strlen($post['body']) < $config['min_body_op'] && $post['op'])
+			error(sprintf($config['error']['tooshort_body_op'], $config['min_body_op']));
 		if (mb_strlen($post['password']) > 20)
 			error(sprintf($config['error']['toolong'], 'password'));
 	}