feat: add function to get day of omer (#20)

* add function to get day of omer

* update syntax

* fix omer tests

* fix lint complaints

src/Moadim/Moadim.php

@@ -10,6 +10,7 @@ trait Moadim
     use CholHamoed;
     use RoshChodesh;
     use AseresYimeiTeshuva;
+    use Omer;
 
     /**
      * Get if we're set to Galus or Israel.

src/Moadim/Omer.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Zman\Moadim;
+
+trait Omer
+{
+    /**
+     * The Omer goes from 1 to 49 from Pesach to Shavuos.
+     *
+     * @return bool
+     */
+    public function getOmerCount()
+    {
+        if ($this->jewishMonth == 8 && $this->jewishDay >= 16) {
+            return $this->jewishDay - 15;
+        }
+        if ($this->jewishMonth == 9) {
+            return $this->jewishDay + 15;
+        }
+        if ($this->jewishMonth == 10 && $this->jewishDay <= 5) {
+            return $this->jewishDay + 44;
+        }
+
+        return 0;
+    }
+}

tests/Moadim/OmerTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Test\Moadim;
+
+use Zman\Zman;
+
+class OmerTest extends \PHPUnit\Framework\TestCase
+{
+    /** @test */
+    public function checks_omer_count()
+    {
+        $this->assertEquals(0, Zman::parse('March 28, 2021')->getOmerCount());
+        $this->assertEquals(1, Zman::parse('March 29, 2021')->getOmerCount());
+        $this->assertEquals(33, Zman::parse('April 30, 2021')->getOmerCount());
+        $this->assertEquals(49, Zman::parse('May 16, 2021')->getOmerCount());
+        $this->assertEquals(0, Zman::parse('May 17, 2021')->getOmerCount());
+        $this->assertEquals(0, Zman::parse('November 14, 2021')->getOmerCount());
+    }
+}