[8.x] Add new VendorTagPublished event (#36458)

* feature: add new VendorTagPublished event

* fix: only fire event when something was published

* refactor: fire event before erroring in console

* revert: move event dispatch into else arm

* chore: update comment on $paths

* chore: publish to publishable

* chore: add missing comment

* Update VendorPublishCommand.php

* Update VendorTagPublished.php

Co-authored-by: Taylor Otwell <taylor@laravel.com>

src/Illuminate/Foundation/Console/VendorPublishCommand.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Console\Command;
 use Illuminate\Filesystem\Filesystem;
+use Illuminate\Foundation\Events\VendorTagPublished;
 use Illuminate\Support\Arr;
 use Illuminate\Support\ServiceProvider;
 use League\Flysystem\Adapter\Local as LocalAdapter;
@@ -159,14 +160,18 @@ protected function publishTag($tag)
     {
         $published = false;
 
-        foreach ($this->pathsToPublish($tag) as $from => $to) {
+        $pathsToPublish = $this->pathsToPublish($tag);
+
+        foreach ($pathsToPublish as $from => $to) {
             $this->publishItem($from, $to);
 
             $published = true;
         }
 
         if ($published === false) {
             $this->error('Unable to locate publishable resources.');
+        } else {
+            $this->laravel['events']->dispatch(new VendorTagPublished($tag, $pathsToPublish));
         }
     }
 

src/Illuminate/Foundation/Events/VendorTagPublished.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Illuminate\Foundation\Events;
+
+class VendorTagPublished
+{
+    /**
+     * The vendor tag that was published.
+     *
+     * @var string
+     */
+    public $tag;
+
+    /**
+     * The publishable paths registered by the tag.
+     *
+     * @var array
+     */
+    public $paths;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param  string  $tag
+     * @param  array  $paths
+     * @return void
+     */
+    public function __construct($tag, $paths)
+    {
+        $this->tag = $tag;
+        $this->paths = $paths;
+    }
+}