Read from stdin.

src/main.rs

@@ -1,9 +1,18 @@
 extern crate ansi_term;
 
+use std::io;
+use std::io::prelude::*;
 use std::f32::consts::PI;
+
 use ansi_term::Colour::RGB;
 
 fn main() {
+    let stdin = io::stdin();
+
+    for c in stdin.lock().chars() {
+        print!("{}", c.unwrap());
+    }
+
     let (red, green, blue) = rainbow(0.1, 0);
 
     println!("{}", RGB(red, green, blue).paint("Steel blue"));