Rely on Zip extension for extracting highlight.js

RoboFile.php

@@ -1,7 +1,6 @@
 <?php
 
 use Robo\Result;
-use splitbrain\PHPArchive\Zip;
 
 class RoboFile extends \Robo\Tasks {
     const BASE = __DIR__.\DIRECTORY_SEPARATOR;
@@ -209,6 +208,7 @@ class RoboFile extends \Robo\Tasks {
         // compile the stylesheet
         $t->taskExec($postcss)->arg($scss)->option("-o", $css);
         // download highlight.js
+        if (extension_loaded("zip")) {
             $t->addCode(function() use ($tmp, $themeout) {
                 $languages = ["php", "bash", "shell", "xml", "nginx", "apache"];
                 $post = http_build_query((function($langs) {
@@ -218,7 +218,7 @@ class RoboFile extends \Robo\Tasks {
                     }
                     return $out;
                 })($languages));
-            $conn = fopen("https://highlightjs.org/download/", "r");
+                $conn = @fopen("https://highlightjs.org/download/", "r");
                 if ($conn === false) {
                     throw new Exception("Unable to download Highlight.js");
                 }
@@ -230,7 +230,7 @@ class RoboFile extends \Robo\Tasks {
                 $token = stream_get_contents($conn);
                 preg_match("/<input type='hidden' name='csrfmiddlewaretoken' value='([^']*)'/", $token, $token);
                 $post = "csrfmiddlewaretoken={$token[1]}&$post";
-            $hljs = file_get_contents("https://highlightjs.org/download/", false, stream_context_create(['http' => [
+                $hljs = @file_get_contents("https://highlightjs.org/download/", false, stream_context_create(['http' => [
                     'method' => "POST",
                     'content' => $post,
                     'header' => [
@@ -244,10 +244,13 @@ class RoboFile extends \Robo\Tasks {
                 } else {
                     file_put_contents($tmp."highlightjs.zip", $hljs);
                 }
-            $z = new Zip;
+                $z = new \ZipArchive;
                 $z->open($tmp."highlightjs.zip");
-            $z->extract($themeout, "", "", "highlight.pack.js");
+                $z->extractTo($themeout, "highlight.pack.js");
             }, "downloadHighlightjs");
+        } else {
+            $this->say("Zip extension not installed; not updating hightlight.js");
+        }
         // execute the collection
         return $t->run();
     }