More like lolcat.

src/main.rs

@@ -80,15 +80,12 @@ fn main() {
     for line in stdin.lock().lines() {
         seed += 1;
 
-        let mut delta = 0;
+        let line = line.unwrap()
+            .trim()
+            .replace("\t", "        ");
 
-        for c in line.unwrap().chars() {
-            delta += match c {
-                '\t' => 8,
-                _ => 1
-            };
-
-            let (red, green, blue) = rainbow(freq, (seed + delta) as f32 / spread);
+        for (n, c) in line.chars().enumerate() {
+            let (red, green, blue) = rainbow(freq, seed as f32 + n as f32 / spread);
 
             print!("{}", RGB(red, green, blue).paint(c.to_string()));
         }