[5.x] Add install:ssg command (#9622)

Co-authored-by: duncanmcclean <duncanmcclean@users.noreply.github.com>
Co-authored-by: Jason Varga <jason@pixelfear.com>

src/Console/Commands/InstallSsg.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Statamic\Console\Commands;
+
+use Facades\Statamic\Console\Processes\Composer;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\Process;
+use Statamic\Console\EnhancesCommands;
+use Statamic\Console\RunsInPlease;
+use Symfony\Component\Process\PhpExecutableFinder;
+
+class InstallSsg extends Command
+{
+    use EnhancesCommands, RunsInPlease;
+
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'statamic:install:ssg';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = "Install & configure Statamic's Static Site Generator package";
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        if (Composer::isInstalled('statamic/ssg')) {
+            return $this->error('The Static Site Generator package is already installed.');
+        }
+
+        $this->info('Installing the statamic/ssg package...');
+        Composer::withoutQueue()->throwOnFailure()->require('statamic/ssg');
+        $this->checkLine('Installed statamic/ssg package');
+
+        if ($this->confirm('Would you like to publish the config file?')) {
+            Process::run([
+                (new PhpExecutableFinder())->find(false) ?: 'php',
+                defined('ARTISAN_BINARY') ? ARTISAN_BINARY : 'artisan',
+                'vendor:publish',
+                '--provider',
+                'Statamic\\StaticSite\\ServiceProvider',
+            ]);
+
+            $this->checkLine('Config file published. You can find it at config/statamic/ssg.php');
+        }
+
+        if (
+            ! Composer::isInstalled('spatie/fork')
+            && $this->confirm('Would you like to install spatie/fork? It allows for running multiple workers at once.')
+        ) {
+            Composer::withoutQueue()->throwOnFailure()->require('spatie/fork');
+            $this->checkLine('Installed spatie/fork package');
+        }
+    }
+}

src/Providers/ConsoleServiceProvider.php

@@ -15,6 +15,7 @@ class ConsoleServiceProvider extends ServiceProvider
         Commands\AssetsMeta::class,
         Commands\GlideClear::class,
         Commands\Install::class,
+        Commands\InstallSsg::class,
         Commands\FlatCamp::class,
         Commands\LicenseSet::class,
         Commands\MakeAction::class,