doc: about rust content (jaywcjlove#70)

docs/rust.md

@@ -6,6 +6,35 @@ Rust 快速参考备忘单，旨在为编写基本语法和方法提供帮助。
 入门
 ---
 
+### 配置 vscode 调试
+<!--rehype:wrap-class=row-span-2-->
+
+参考：<https://github.com/vadimcn/vscode-lldb/blob/master/MANUAL.md#source-path-remapping>
+
+下载 CodeLLDB，选择 rust 自动生成 launch.json 文件
+
+```json
+{
+  "configurations": [
+    // 添加一下行，使 vec、hashmap 等类型显示正常
+    "sourceLanguages": ["rust"]
+  ]
+}
+```
+
+----
+
+将编译文件与标准库的位置进行映射
+
+```json
+{
+  "lldb.launch.sourceMap": {
+    // 你自己的映射 hash 和映射路径
+    "/rustc/4b91a6ea7258a947e59c6522cd5898e7c0a6a88f": "/Users/feiwu/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust"
+  }
+}
+```
+
 ### Hello_World.rs
 
 ```rust
@@ -981,9 +1010,108 @@ fn dead_end() -> ! {
     panic!("panic!!!!!");
 }
 ```
-
 <!--rehype:className=wrap-text -->
 
+惯用转换
+-----
+
+### &str -> String
+
+```rust
+String::from("str");
+"str".to_string();
+"str".to_owned();
+```
+
+### &str -> &[u8]
+
+```rust
+"str".as_bytes();
+```
+
+或者你也可以使用 `b""`
+
+```rust
+println!("{:?}", b"str");
+```
+
+### &str -> Vec<u8>
+
+```rust
+"str".as_bytes().to_vec();
+"str".as_bytes().to_owned();
+```
+
+### String -> &str
+
+```rust
+let s = String::from("str");
+let r = s.as_str();
+```
+
+### String -> &[u8]
+
+```rust
+let s = String::from("str");
+let v = s.as_bytes();
+```
+
+### String -> Vec<u8>
+
+```rust
+let s = String::from("str");
+let v = s.into_bytes();
+```
+
+### &[u8] -> &str
+
+```rust
+let b = "str".as_bytes();
+let str = std::str::from_utf8(b).unwrap();
+```
+
+### &[u8] -> String
+
+```rust
+let b = "str".as_bytes();
+let str = String::from_utf8(b.to_vec()).unwrap();
+```
+
+### &[u8] -> Vec<u8>
+
+```rust
+let b = "str".as_bytes();
+let str = b.to_vec();
+```
+
+----
+
+```rust
+let b = "str".as_bytes();
+let str = b.to_owned();
+```
+
+### Vec<u8> -> &str
+
+```rust
+let b = "str".as_bytes().to_vec();
+let s = std::str::from_utf8(&b).unwrap();
+```
+
+### Vec<u8> -> &[u8]
+
+```rust
+let b = "str".as_bytes().to_vec();
+let s = b.as_slice();
+```
+
+### Vec<u8> -> String
+
+```rust
+let b = "str".as_bytes().to_vec();
+let s = String::from_utf8(b).unwrap();
+```
+
 杂项
 -----