Add option to strip empty columns from rendered table

src/TableRenderer.php

@@ -16,12 +16,19 @@ class TableRenderer extends Hardcoded implements Renderer
     private $headRowDelimiter;
     private $headColDelimiter;
     private $outlineVertical;
+    private $stripEmptyCols = false;
 
     public function __construct(\Iterator $rows)
     {
         $this->rowsIterator = $rows;
     }
 
+    public function stripEmptyColumns()
+    {
+        $this->stripEmptyCols = true;
+        return $this;
+    }
+
     public function setColDelimiter($delimiter = '   ')
     {
         $this->colDelimiter = $delimiter;
@@ -75,6 +82,7 @@ public function setOutlineVertical($outlineVertical)
 
     private $lines = array();
     private $length = array();
+    private $maxValueLength = array();
     private $keys = array();
     private $rows = array();
     private $rowDelimiterLine;
@@ -92,6 +100,9 @@ private function findLines()
                     if (!isset($this->length[$key]) || $this->length[$key] < $stringLength) {
                         $this->length[$key] = $stringLength;
                     }
+                    if ($rowIndex > 0 && (!isset($this->maxValueLength[$key]) || $this->maxValueLength[$key] < $stringLength)) {
+                        $this->maxValueLength[$key] = $stringLength;
+                    }
                     $this->lines [$rowIndex][$lineIndex][$key] = $line;
                 }
             }
@@ -139,6 +150,10 @@ protected function buildLine($row, $pad = ' ')
     {
         $line = '';
         foreach ($this->length as $key => $maxLength) {
+            if ($this->stripEmptyCols && empty($this->maxValueLength[$key])) {
+                continue;
+            }
+
             /** @var \Yaoi\Cli\View\Text $value */
             $value = isset($row[$key]) ? $row[$key] : null;