Basic args rust parsing.

2025/01/rust_demo1/.gitignore

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+target/

2025/01/rust_demo1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "getopts"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
+dependencies = [
+ "unicode-width",
+]
+
+[[package]]
+name = "rust_demo1"
+version = "0.1.0"
+dependencies = [
+ "getopts",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"

2025/01/rust_demo1/Cargo.toml

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+[package]
+name = "rust_demo1"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+getopts = "0.2.21"

2025/01/rust_demo1/src/main.rs

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+use getopts::Options;
+
+/**
+fn get_help(args: &Vec<String>, opts: &Options) -> String {
+    return format!("Usage: {} -h? --help?", args[0]);
+}
+**/
+
+fn main() {
+    println!("Hello, world!");
+
+    for (key,arg) in std::env::args_os().enumerate() {
+        println!("[{}] Arg: {:?}", key, arg.to_str().expect("Arg should be serializable to string"));
+    }
+
+    let args: Vec<String> = std::env::args().collect();
+    let mut opts = Options::new();
+    opts.optflag("h", "help", "print this help");
+    // let usage = get_help(&args, &opts);
+    // opts.usage(&usage);
+
+    let matches = match opts.parse(&args[1..]) {
+        Ok(m) => { m }
+        Err(f) => panic!("Got error: {}", f.to_string())
+    };
+
+    if matches.opt_present("h") {
+        // println!(get_help(&args, &opts));
+        let program = format!("{} [args]", args[0]);
+        println!("Usage: {}", opts.usage(&program));
+        return;
+    }
+
+    println!("Running...");
+
+
+}