From 85a8d2d98b3b713bb0b9121cdb39f09515ecf4b2 Mon Sep 17 00:00:00 2001
From: flynsarmy <flynsarmy@gmail.com>
Date: Wed, 9 Mar 2022 21:48:37 +1000
Subject: [PATCH] Add function to check if optimizers are installed

---
 src/ImageOptimizer/ChainOptimizer.php   |  6 +++---
 src/ImageOptimizer/Command.php          |  6 +++---
 src/ImageOptimizer/CommandOptimizer.php |  4 ++--
 src/ImageOptimizer/OptimizerFactory.php | 28 +++++++++++++++++++++++++
 4 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/src/ImageOptimizer/ChainOptimizer.php b/src/ImageOptimizer/ChainOptimizer.php
index 0850bf3..945ba94 100644
--- a/src/ImageOptimizer/ChainOptimizer.php
+++ b/src/ImageOptimizer/ChainOptimizer.php
@@ -11,9 +11,9 @@ class ChainOptimizer implements Optimizer
     /**
      * @var Optimizer[]
      */
-    private $optimizers;
-    private $executeFirst;
-    private $logger;
+    public $optimizers;
+    public $executeFirst;
+    public $logger;
 
     public function __construct(array $optimizers, bool $executeFirst, LoggerInterface $logger)
     {
diff --git a/src/ImageOptimizer/Command.php b/src/ImageOptimizer/Command.php
index ff01648..fc2245b 100644
--- a/src/ImageOptimizer/Command.php
+++ b/src/ImageOptimizer/Command.php
@@ -11,9 +11,9 @@
 
 final class Command
 {
-    private $cmd;
-    private $args;
-    private $timeout;
+    public $cmd;
+    public $args;
+    public $timeout;
 
     public function __construct(string $bin, array $args = [], ?float $timeout = null)
     {
diff --git a/src/ImageOptimizer/CommandOptimizer.php b/src/ImageOptimizer/CommandOptimizer.php
index 021b15a..6983e02 100644
--- a/src/ImageOptimizer/CommandOptimizer.php
+++ b/src/ImageOptimizer/CommandOptimizer.php
@@ -6,8 +6,8 @@
 
 class CommandOptimizer implements Optimizer
 {
-    private $command;
-    private $extraArgs;
+    public $command;
+    public $extraArgs;
 
     public function __construct(Command $command, $extraArgs = null)
     {
diff --git a/src/ImageOptimizer/OptimizerFactory.php b/src/ImageOptimizer/OptimizerFactory.php
index ee98fda..3a72171 100644
--- a/src/ImageOptimizer/OptimizerFactory.php
+++ b/src/ImageOptimizer/OptimizerFactory.php
@@ -142,6 +142,34 @@ function ($filepath) {
         ]));
     }
 
+    public function checkOptimizers()
+    {
+        $apps = [];
+
+        // Get a complete list of apps we currently support
+        foreach ($this->optimizers as $optimizer) {
+            $unwrapped = $optimizer->unwrap();
+
+            if ($unwrapped instanceof ChainOptimizer) {
+                foreach ($unwrapped->optimizers as $commandOptimizer) {
+                    $apps[$commandOptimizer->command->cmd] = false;
+                }
+            } elseif ($unwrapped instanceof CommandOptimizer) {
+                $apps[$unwrapped->command->cmd] = false;
+            }
+        }
+
+        // Loop through our apps calling 'which' on them to see if they're installed
+        foreach (array_keys($apps) as $app) {
+            $process = new \Symfony\Component\Process\Process(['which', $app]);
+            $process->run();
+
+            $apps[$app] = $process->isSuccessful();
+        }
+
+        return $apps;
+    }
+
     private function commandOptimizer(string $command, array $args, $extraArgs = null): CommandOptimizer
     {
         return new CommandOptimizer(