cargo scripts examples

example_cargo_script.rs

#!/usr/bin/env -S cargo +nightly -Zscript -q
---cargo
[package]
edition = "2024"

[dependencies]
rand = "0.9.2"
clap = { version = "4", features = ["derive"] }
---

use clap::Parser;
use rand;
//use std::env;

#[derive(Parser)]
struct Args {
    /// Name to greet
    #[arg(short, long, default_value = "Stranger")]
    name: String,

    /// Number of times to greet
    #[arg(short, long, default_value_t = 1)]
    count: u8,
}

fn upper_greet(name: &str) -> String {
    format!("Hello {}", name.to_uppercase())
}

fn main() {
    //let args: Vec<String> = env::args().collect();
    //println!("{:?}", args); // args[0] ist Programmname
    //let name = args.get(1).map_or("Stranger", String::as_str);
    let args = Args::parse();
    let x: u8 = rand::random();
    println!("Random number: {x}");
    let my_greet = upper_greet(&args.name);
    println!("{}", my_greet)
}

example_http_request.rs

#!/usr/bin/env -S cargo +nightly -Zscript -q
---cargo
[package]
edition = "2024"

[dependencies]
reqwest = { version = "0.12", features = ["json"] }
tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
anyhow = "1"

---
use anyhow::{Context, Result, bail};
use std::collections::HashMap;

#[tokio::main]
async fn main() -> Result<()> {
    let resp = reqwest::get("https://httpbin.org/ip")
        .await
        .context("Failed to connect to httpbin.org")?
        .json::<HashMap<String, String>>()
        .await
        .context("Failed to parse JSON response")?;

    let origin = resp
        .get("origin")
        .context("Response missing 'origin' field")?;

    if origin.is_empty() {
        bail!("Origin IP is empty!");
    }

    println!("Your IP: {}", origin);
    Ok(())
}

settings.json

{
  "rust-analyzer.cargo.buildScripts.enable": true,
  "rust-analyzer.procMacro.enable": true,
  "rust-analyzer.cargo.extraEnv": {
    "RUSTUP_TOOLCHAIN": "nightly"
  },
  "rust-analyzer.server.extraEnv": {
    "RUSTUP_TOOLCHAIN": "nightly"
  },
  "rust-analyzer.linkedProjects": [
    "example_cargo_script.rs",
    "example_http_request.rs"
  ]
}