test(readme): test readme code fences

Author: seanmonstar

.travis.yml

@@ -18,6 +18,7 @@ cache:
         - target/debug/build
 
 script:
+  - ./.travis/readme.py
   - cargo build --verbose $FEATURES
   - cargo test --verbose $FEATURES
   - 'if [ $TRAVIS_RUST_VERSION = nightly ]; then cargo bench --no-run; fi'

.travis/readme.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+import re
+
+f = open('README.md', 'r')
+raw = f.read()
+
+for (i, code) in enumerate(re.findall(r'```rust([^`]*)```', raw, re.M)):
+    with open('examples/readme_%s.rs' % i, 'w') as f:
+        f.write('#![deny(warnings)]%s' % code)

README.md

@@ -54,7 +54,7 @@ use hyper::header::Connection;
 
 fn main() {
     // Create a client.
-    let mut client = Client::new();
+    let client = Client::new();
 
     // Creating an outgoing request.
     let mut res = client.get("http://rust-lang.org/")