init

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "tuto"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "tuto"
+version = "0.1.0"
+authors = ["alban <git@albancrommer.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+use std::env;
+
+#[derive(Debug)]
+enum Maybe<T> {
+  Just(T),
+  Nothing
+}
+
+fn main() {
+  let arg = env::args().nth(1);
+
+  println!("{:?}", Maybe::Just(42));
+
+  match arg {
+    Some(result) => {
+      let ip = ip_to_int(&result);
+      println!("{:b}", ip);
+    },
+    None => println!("need one arg")
+  }
+
+
+
+}
+
+fn ip_to_int(ip_str: &str) -> u32 {
+    let mut tbl : Vec<&str> = ip_str.split(".")
+      .collect();
+    tbl.reverse();
+
+    let mut ip = 0_u32;
+
+  for (idx, s) in tbl.iter().enumerate() {
+    let nbr : u8 = s.parse()
+      .expect("parse fail");
+    ip += (nbr as u32) << 8*idx;
+  }
+  ip
+}