Remove iron-gcd; it's not used in the 2nd edition.

iron-gcd/.gitignore

@@ -1 +0,0 @@
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iron-gcd/Cargo.toml

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-[package]
-name = "iron-gcd"
-version = "0.1.0"
-authors = ["You <you@example.com>"]
-
-[dependencies]
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-mime = "0.2.3"
-router = "0.5.1"
-urlencoded = "0.5.0"

iron-gcd/README.md

@@ -1,5 +0,0 @@
-# A simple web server, in Rust
-
-This program uses the `Iron` framework to implement a simple web server in Rust.
-Run the program with `cargo run`, visit `http://localhost:3000/`, and then ask
-it to compute the greatest common denominator of some numbers for you!

iron-gcd/src/main.rs

@@ -1,101 +0,0 @@
-extern crate iron;
-#[macro_use] extern crate mime;
-
-use iron::prelude::*;
-use iron::status;
-
-extern crate router;
-use router::Router;
-
-fn main() {
-    let mut router = Router::new();
-
-    router.get("/", get_form, "root");
-    router.post("/gcd", post_gcd, "gcd");
-
-    println!("Serving on http://localhost:3000...");
-    Iron::new(router).http("localhost:3000").unwrap();
-}
-
-fn get_form(_request: &mut Request) -> IronResult<Response> {
-    let mut response = Response::new();
-
-    response.set_mut(status::Ok);
-    response.set_mut(mime!(Text/Html; Charset=Utf8));
-    response.set_mut(r#"
-        <title>GCD Calculator</title>
-        <form action="/gcd" method="post">
-          <input type="text" name="n"/>
-          <input type="text" name="n"/>
-          <button type="submit">Compute GCD</button>
-        </form>
-    "#);
-
-    Ok(response)
-}
-
-extern crate urlencoded;
-
-use std::str::FromStr;
-use urlencoded::UrlEncodedBody;
-
-fn post_gcd(request: &mut Request) -> IronResult<Response> {
-    let mut response = Response::new();
-
-    let form_data = match request.get_ref::<UrlEncodedBody>() {
-        Err(e) => {
-            response.set_mut(status::BadRequest);
-            response.set_mut(format!("Error parsing form data: {:?}\n", e));
-            return Ok(response);
-        }
-        Ok(map) => map
-    };
-
-    let unparsed_numbers = match form_data.get("n") {
-        None => {
-            response.set_mut(status::BadRequest);
-            response.set_mut(format!("form data has no 'n' parameter\n"));
-            return Ok(response);
-        }
-        Some(nums) => nums
-    };
-
-    let mut numbers = Vec::new();
-    for unparsed in unparsed_numbers {
-        match u64::from_str(&unparsed) {
-            Err(_) => {
-                response.set_mut(status::BadRequest);
-                response.set_mut(
-                    format!("Value for 'n' parameter not a number: {:?}\n",
-                            unparsed));
-                return Ok(response);
-            }
-            Ok(n) => { numbers.push(n); }
-        }
-    }
-
-    let mut d = numbers[0];
-    for m in &numbers[1..] {
-        d = gcd(d, *m);
-    }
-
-    response.set_mut(status::Ok);
-    response.set_mut(mime!(Text/Html; Charset=Utf8));
-    response.set_mut(
-        format!("The greatest common divisor of the numbers {:?} is <b>{}</b>\n",
-                numbers, d));
-    Ok(response)
-}
-
-fn gcd(mut n: u64, mut m: u64) -> u64 {
-    assert!(n != 0 && m != 0);
-    while m != 0 {
-        if m < n {
-            let t = m;
-            m = n;
-            n = t;
-        }
-        m = m % n;
-    }
-    n
-}