M2: 主题系统（sablog经典+modern简约）+ 前台全部页面 + 老 URL 301 兼容 + markdown 双份导入

app/Console/Commands/ConvertContent.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Post;
+use Illuminate\Console\Command;
+use League\HTMLToMarkdown\HtmlConverter;
+
+class ConvertContent extends Command
+{
+    protected $signature = 'content:convert
+        {--all : 转换全部 html 文章}
+        {id? : 单篇文章 ID}
+        {--dry-run : 只预览不写库}';
+
+    protected $description = '把文章内容从 HTML 转换为 Markdown（老 sablog 数据迁移用）';
+
+    public function handle(): int
+    {
+        $query = Post::query()->where('content_format', 'html');
+
+        if ($id = $this->argument('id')) {
+            $query->where('id', $id);
+        } elseif (! $this->option('all')) {
+            $this->error('请指定文章 ID 或使用 --all');
+
+            return self::FAILURE;
+        }
+
+        $converter = new HtmlConverter([
+            'strip_tags' => false,
+            'hard_break' => true,
+        ]);
+
+        $renderer = app(\App\Blog\Services\PostContentRenderer::class);
+
+        $posts = $query->get();
+        if ($posts->isEmpty()) {
+            $this->info('没有需要转换的 HTML 文章');
+
+            return self::SUCCESS;
+        }
+
+        $bar = $this->output->createProgressBar($posts->count());
+        $bar->start();
+
+        foreach ($posts as $post) {
+            // [attach=xx] 是 markdown 保留字符，先换成令牌，渲染时再解析
+            $markdown = $converter->convert($renderer->toMarkdownSafeTokens($post->content));
+
+            if ($this->option('dry-run')) {
+                $this->newLine();
+                $this->line("[{$post->id}] {$post->title}");
+                $this->line(mb_substr($markdown, 0, 200));
+                $bar->advance();
+                continue;
+            }
+
+            $post->content = $markdown;
+            $post->content_format = 'markdown';
+            $post->save();
+
+            $bar->advance();
+        }
+
+        $bar->finish();
+        $this->newLine();
+        $this->info('转换完成：'.($this->option('dry-run') ? '预览模式，未写库' : $posts->count().' 篇已转换为 Markdown'));
+
+        return self::SUCCESS;
+    }
+}