added percentage formatting (still need to set column type in excel...)

src/ColumnFormatter/PercentageFormatter.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Fastbolt\ExcelWriter\ColumnFormatter;
+
+use Fastbolt\ExcelWriter\ColumnSetting;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+
+class PercentageFormatter extends BaseFormatter
+{
+    private int $decimalLength;
+
+    public function __construct(ColumnSetting $column)
+    {
+        $this->decimalLength = $column->getDecimalLength();
+    }
+
+    public function getAlignment(): array
+    {
+        return ['horizontal' => Alignment::HORIZONTAL_RIGHT];
+    }
+
+    public function getNumberFormat(): array
+    {
+        $formatCode = '0.' . str_repeat('0', $this->decimalLength) . '%';
+
+        return ['formatCode' => $formatCode];
+    }
+}

src/ColumnSetting.php

@@ -12,6 +12,7 @@
 use Fastbolt\ExcelWriter\ColumnFormatter\DateFormatter;
 use Fastbolt\ExcelWriter\ColumnFormatter\FloatFormatter;
 use Fastbolt\ExcelWriter\ColumnFormatter\IntegerFormatter;
+use Fastbolt\ExcelWriter\ColumnFormatter\PercentageFormatter;
 use Fastbolt\ExcelWriter\ColumnFormatter\StringFormatter;
 
 class ColumnSetting
@@ -20,6 +21,7 @@ class ColumnSetting
     public const FORMAT_FLOAT   = 'float';
     public const FORMAT_STRING  = 'string';
     public const FORMAT_DATE    = 'datetime';
+    public const FOMRAT_PERCENTAGE = 'percentage';
 
     private string $format;
     private string $name = '';    //excel-name for the column
@@ -92,6 +94,8 @@ public function getFormatter(): ColumnFormatter
                 return new IntegerFormatter();
             case self::FORMAT_FLOAT:
                 return new FloatFormatter($this);
+            case self::FOMRAT_PERCENTAGE:
+                return new PercentageFormatter($this);
         }
 
         return new StringFormatter();