Implemented contexts, optimizations

lib/Style.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace NoccyLabs\Shell;
+
+class Style
+{
+    const NONE          = null;
+
+    const BLACK         = 0;
+    const RED           = 1;
+    const GREEN         = 2;
+    const YELLOW        = 3;
+    const BLUE          = 4;
+    const CYAN          = 5;
+    const MAGENTA       = 6;
+    const WHITE         = 7;
+    const GRAY          = 8;
+    const BR_RED        = 9;
+    const BR_GREEN      = 10;
+    const BR_YELLOW     = 11;
+    const BR_BLUE       = 12;
+    const BR_CYAN       = 13;
+    const BR_MAGENTA    = 14;
+    const BR_WHITE      = 15;
+
+    const A_INTENSE     = 1;
+    const A_UNDERLINE   = 4;
+    const A_INVERSE     = 7;
+
+    protected $fg = self::NONE;
+
+    protected $bg = self::NONE;
+
+    public function __construct($fg=self::NONE, $bg=self::NONE)
+    {
+        $this->fg = $fg;
+        $this->bg = $bg;
+    }
+
+    public function __invoke($string)
+    {
+        $pre = null; $post = null;
+        if ($this->fg !== self::NONE) {
+            $pre.= "\e[".(($this->fg > 7)?(90+($this->fg-8)):(30+$this->fg))."m"; 
+            $post.= "\e[39m";
+        }
+        if ($this->bg !== self::NONE) {
+            $pre.= "\e[".(($this->bg > 7)?(100+($this->bg-8)):(40+$this->bg))."m"; 
+            $post.= "\e[49m";
+        }
+        
+        return $pre . $string . $post;
+
+    }
+
+}