[10.x] Add a "channel:list" command

src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php

@@ -373,4 +373,14 @@ protected function channelNameMatchesPattern($channel, $pattern)
     {
         return preg_match('/^'.preg_replace('/\{(.*?)\}/', '([^\.]+)', $pattern).'$/', $channel);
     }
+
+    /**
+     * Get all of the registered channels.
+     *
+     * @return \Illuminate\Support\Collection
+     */
+    public function getChannels()
+    {
+        return collect($this->channels);
+    }
 }

src/Illuminate/Foundation/Console/ChannelListCommand.php

@@ -0,0 +1,151 @@
+<?php
+
+namespace Illuminate\Foundation\Console;
+
+use Closure;
+use Illuminate\Console\Command;
+use Illuminate\Contracts\Broadcasting\Broadcaster;
+use Illuminate\Support\Collection;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Terminal;
+
+#[AsCommand(name: 'channel:list')]
+class ChannelListCommand extends Command
+{
+    /**
+     * The console command name.
+     *
+     * @var string
+     */
+    protected $name = 'channel:list';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'List all registered private broadcast channels';
+
+    /**
+     * The terminal width resolver callback.
+     *
+     * @var \Closure|null
+     */
+    protected static $terminalWidthResolver;
+
+    /**
+     * Execute the console command.
+     *
+     * @param  \Illuminate\Contracts\Broadcasting\Broadcaster
+     * @return void
+     */
+    public function handle(Broadcaster $broadcaster)
+    {
+        $channels = $broadcaster->getChannels();
+
+        if (! $this->laravel->providerIsLoaded('App\Providers\BroadcastServiceProvider') &&
+            file_exists($this->laravel->path('Providers/BroadcastServiceProvider.php'))) {
+            $this->components->warn('The [App\Providers\BroadcastServiceProvider] has not been loaded. Your private channels may not be loaded.');
+        }
+
+        if (! $channels->count()) {
+            return $this->components->error("Your application doesn't have any private broadcasting channels.");
+        }
+
+        $this->displayChannels($channels);
+    }
+
+    /**
+     * Display the channel information on the console.
+     *
+     * @param  Collection  $channels
+     * @return void
+     */
+    protected function displayChannels($channels)
+    {
+        $this->output->writeln($this->forCli($channels));
+    }
+
+    /**
+     * Convert the given channels to regular CLI output.
+     *
+     * @param  \Illuminate\Support\Collection  $channels
+     * @return array
+     */
+    protected function forCli($channels)
+    {
+        $maxChannelName = $channels->keys()->max(function ($channelName) {
+            return mb_strlen($channelName);
+        });
+
+        $terminalWidth = $this->getTerminalWidth();
+
+        $channelCount = $this->determineChannelCountOutput($channels, $terminalWidth);
+
+        return $channels->map(function ($channel, $channelName) use ($maxChannelName, $terminalWidth) {
+            $resolver = $channel instanceof Closure ? 'Closure' : $channel;
+
+            $spaces = str_repeat(' ', max($maxChannelName + 6 - mb_strlen($channelName), 0));
+
+            $dots = str_repeat('.', max(
+                $terminalWidth - mb_strlen($channelName.$spaces.$resolver) - 6, 0
+            ));
+
+            $dots = empty($dots) ? $dots : " $dots";
+
+            return sprintf(
+                '  <fg=blue;options=bold>%s</> %s<fg=white>%s</><fg=#6C7280>%s</>',
+                $channelName,
+                $spaces,
+                $resolver,
+                $dots,
+            );
+        })
+            ->filter()
+            ->sort()
+            ->prepend('')
+            ->push('')->push($channelCount)->push('')
+            ->toArray();
+    }
+
+    /**
+     * Determine and return the output for displaying the number of registered chanels in the CLI output.
+     *
+     * @param  \Illuminate\Support\Collection  $channels
+     * @param  int  $terminalWidth
+     * @return string
+     */
+    protected function determineChannelCountOutput($channels, $terminalWidth)
+    {
+        $channelCountText = 'Showing ['.$channels->count().'] private channels';
+
+        $offset = $terminalWidth - mb_strlen($channelCountText) - 2;
+
+        $spaces = str_repeat(' ', $offset);
+
+        return $spaces.'<fg=blue;options=bold>Showing ['.$channels->count().'] private channels</>';
+    }
+
+    /**
+     * Get the terminal width.
+     *
+     * @return int
+     */
+    public static function getTerminalWidth()
+    {
+        return is_null(static::$terminalWidthResolver)
+            ? (new Terminal)->getWidth()
+            : call_user_func(static::$terminalWidthResolver);
+    }
+
+    /**
+     * Set a callback that should be used when resolving the terminal width.
+     *
+     * @param  \Closure|null  $resolver
+     * @return void
+     */
+    public static function resolveTerminalWidthUsing($resolver)
+    {
+        static::$terminalWidthResolver = $resolver;
+    }
+}

src/Illuminate/Foundation/Providers/ArtisanServiceProvider.php

@@ -28,6 +28,7 @@
 use Illuminate\Database\Console\WipeCommand;
 use Illuminate\Foundation\Console\AboutCommand;
 use Illuminate\Foundation\Console\CastMakeCommand;
+use Illuminate\Foundation\Console\ChannelListCommand;
 use Illuminate\Foundation\Console\ChannelMakeCommand;
 use Illuminate\Foundation\Console\ClearCompiledCommand;
 use Illuminate\Foundation\Console\ComponentMakeCommand;
@@ -165,6 +166,7 @@ class ArtisanServiceProvider extends ServiceProvider implements DeferrableProvid
     protected $devCommands = [
         'CacheTable' => CacheTableCommand::class,
         'CastMake' => CastMakeCommand::class,
+        'ChannelList' => ChannelListCommand::class,
         'ChannelMake' => ChannelMakeCommand::class,
         'ComponentMake' => ComponentMakeCommand::class,
         'ConsoleMake' => ConsoleMakeCommand::class,