dice.php: extract email dice function from functions.php

inc/functions/dice.php

@@ -0,0 +1,61 @@
+<?php
+namespace Vichan\Functions\Dice;
+
+/* Die rolling:
+ * If "dice XdY+/-Z" is in the email field (where X or +/-Z may be
+ * missing), X Y-sided dice are rolled and summed, with the modifier Z
+ * added on.  The result is displayed at the top of the post.
+ */
+function email_dice_roll($post) {
+	global $config;
+	if(strpos(strtolower($post->email), 'dice%20') === 0) {
+		$dicestr = str_split(substr($post->email, strlen('dice%20')));
+
+		// Get params
+		$diceX = '';
+		$diceY = '';
+		$diceZ = '';
+
+		$curd = 'diceX';
+		for($i = 0; $i < count($dicestr); $i ++) {
+			if(is_numeric($dicestr[$i])) {
+				$$curd .= $dicestr[$i];
+			} else if($dicestr[$i] == 'd') {
+				$curd = 'diceY';
+			} else if($dicestr[$i] == '-' || $dicestr[$i] == '+') {
+				$curd = 'diceZ';
+				$$curd = $dicestr[$i];
+			}
+		}
+
+		// Default values for X and Z
+		if($diceX == '') {
+			$diceX = '1';
+		}
+
+		if($diceZ == '') {
+			$diceZ = '+0';
+		}
+
+		// Intify them
+		$diceX = intval($diceX);
+		$diceY = intval($diceY);
+		$diceZ = intval($diceZ);
+
+		// Continue only if we have valid values
+		if($diceX > 0 && $diceY > 0) {
+			$dicerolls = array();
+			$dicesum = $diceZ;
+			for($i = 0; $i < $diceX; $i++) {
+				$roll = rand(1, $diceY);
+				$dicerolls[] = $roll;
+				$dicesum += $roll;
+			}
+
+			// Prepend the result to the post body
+			$modifier = ($diceZ != 0) ? ((($diceZ < 0) ? ' - ' : ' + ') . abs($diceZ)) : '';
+			$dicesum = ($diceX > 1) ? ' = ' . $dicesum : '';
+			$post->body = '<table class="diceroll"><tr><td><img src="'.$config['dir']['static'].'d10.svg" alt="Dice roll" width="24"></td><td>Rolled ' . implode(', ', $dicerolls) . $modifier . $dicesum . '</td></tr></table><br/>' . $post->body;
+		}
+	}
+}