Rustlang - sgml/signature GitHub Wiki

Runtime

• https://doc.rust-lang.org/reference/runtime.html
• https://www.osohq.com/post/rust-reflection-pt-1

Porting C

HTTPD Integration

use apache2::server::{APRSuccess, HTTP_MOVED_PERMANENTLY};
use apache2::{ApacheModule, Request, Status};

pub struct RedirectModule;

impl ApacheModule for RedirectModule {
    fn handler(r: &mut Request) -> Status {
        if r.uri().starts_with("/old-path") {
            r.headers_out().add("Location", "http://example.com/new-path");
            r.set_status(HTTP_MOVED_PERMANENTLY);
            return Status::DONE; // Complete handling for the request
        }
        Status::DECLINED // Let other handlers process the request
    }
}

Installer

cargo add apache2

Build

cargo build --release

httpd.conf

LoadModule redirect_module /usr/lib/apache2/modules/mod_redirect.rs.so
```

#### mod_test

t/TEST -start t/TEST -run

## Projects
```
tools:
  text_editors:
    - name: "Zed"
      url: "https://zed.dev"
    - name: "Helix"
      url: "https://helix-editor.com"
    - name: "Lapce"
      url: "https://lapce.dev"
    - name: "Kibi"
      url: "https://github.com/ilai-deutel/kibi"
  ides:
    - name: "Lapce"
      url: "https://lapce.dev"
    - name: "Zed"
      url: "https://zed.dev"
  email_clients:
    - name: "Himalaya"
      url: "https://github.com/pimalaya/himalaya"
    - name: "Lettre"
      url: "https://docs.rs/lettre/latest/lettre/"
    - name: "Email-lib"
      url: "https://docs.rs/email-lib"
  rest_clients:
    - name: "Reqwest"
      url: "https://github.com/seanmonstar/reqwest"
    - name: "Hyper"
      url: "https://hyper.rs"
    - name: "Surf"
      url: "https://github.com/http-rs/surf"
```

## Compiletime

* https://www.shuttle.rs/blog/2022/12/23/procedural-macros
* https://tembo.io/blog/postgres-extension-in-rust-pgmq

## Complexity

Closures & Lambdas: The Rust idiom `let add = |x, y| x + y;` uses an anonymous function with environment capture, which cannot be mapped to another language that does not implement this natively.

Pattern Matching: Rust's match statement supports deep pattern matching (with nested or complex patterns) that has no direct counterpart with `IF...ELSE` or `SELECT CASE...WHEN`. A regex approach would fail to capture nested patterns reliably.

Generics and Trait Bounds: complex type inference and compile‑time checking cannot be simply mapped from Rust to another language.

Async/Await Patterns: asynchronous primitives cannot be mapped to a synchronous execution model.

Macros: Compile‑time code generation cannot be mapped to another language.

Unsafe Blocks & Pointer Arithmetic: Pointer memory operations cannot be mapped to another language.

## Assertion

Rust assertions can be disabled by the `debug_assert!` macro.

## Rust for Basic Devs
| Regex                             | Rust Code                          | QBasic Code                |
|-----------------------------------|------------------------------------|----------------------------|
| `let (\w+) = (.+);`               | `let x = 42;`                      | `x = 42`                   |
| `println!\("(.*)"\);`             | `println!("Hello, world!");`        | `PRINT "Hello, world!"`    |
| `fn (\w+)\(.*\) {`                | `fn add(a: i32, b: i32) {`           | `FUNCTION add(a, b)`        |