[Draft] 代码块展示：多文件切换与展开

多文件切换

点击顶部的 main.rs 和 src/types/operator/builder.rs 切换文件。右侧第一个按钮复制当前文件，第二个按钮展开窗口；展开后按 Esc 返回。

#[path = "src/types/operator/builder.rs"]
mod builder;

use builder::OperatorBuilder;

fn main() {
    let operator = OperatorBuilder::new("local")
        .with_timeout(30)
        .finish();

    println!("{}", operator);
}

pub struct OperatorBuilder {
    name: String,
    timeout: u64,
}

impl OperatorBuilder {
    pub fn new(name: &str) -> Self {
        Self {
            name: name.to_owned(),
            timeout: 10,
        }
    }

    pub fn with_timeout(mut self, seconds: u64) -> Self {
        self.timeout = seconds;
        self
    }

    pub fn finish(self) -> String {
        format!("{}: timeout={}s", self.name, self.timeout)
    }
}

单文件展示

单文件也会显示文件名、行号和工具栏。

{
  "name": "blog-code-demo",
  "theme": "dark",
  "features": ["file-tabs", "copy", "expand"]
}

文章里怎么写

为相邻代码块填写文件名和相同的组名，就能显示为一组文件标签。

```rust title="main.rs" group="demo"
fn main() {}
```

```rust title="builder.rs" group="demo"
pub struct OperatorBuilder;
```