Move nick hue functions to their own module

src/lib.rs

@@ -14,8 +14,7 @@ pub mod api;
 pub mod bot;
 pub mod conn;
 mod emoji;
-mod huehash;
+pub mod nick;
 mod replies;
 
 pub use emoji::Emoji;
-pub use huehash::{nick_hue, nick_hue_without_removing_emoji};

src/nick.rs

@@ -1,7 +1,9 @@
+//! Nick-related utility functions.
+
 use crate::emoji::Emoji;
 
 /// Does not remove emoji.
-fn normalize(text: &str) -> String {
+fn hue_normalize(text: &str) -> String {
     text.chars()
         .filter(|&c| c.is_ascii_alphanumeric() || c == '_' || c == '-')
         .map(|c| c.to_ascii_lowercase())
@@ -24,13 +26,13 @@ fn hue_hash(text: &str, offset: i64) -> u8 {
 
 const GREENIE_OFFSET: i64 = 148 - 192; // 148 - hue_hash("greenie", 0)
 
-/// Calculate the nick hue without removing colon-delimited emoji as part of
-/// normalization.
+/// Calculate a nick's hue like [`hue`] but without removing colon-delimited
+/// emoji as part of normalization.
 ///
-/// This should be slightly faster than [`nick_hue`] but produces incorrect
-/// results if any colon-delimited emoji are present.
-pub fn nick_hue_without_removing_emoji(nick: &str) -> u8 {
-    let normalized = normalize(nick);
+/// This should be slightly faster than [`hue`] but produces incorrect results
+/// if any colon-delimited emoji are present.
+pub fn hue_without_removing_emoji(nick: &str) -> u8 {
+    let normalized = hue_normalize(nick);
     if normalized.is_empty() {
         hue_hash(nick, GREENIE_OFFSET)
     } else {
@@ -38,6 +40,12 @@ pub fn nick_hue_without_removing_emoji(nick: &str) -> u8 {
     }
 }
 
-pub fn nick_hue(emoji: &Emoji, nick: &str) -> u8 {
-    nick_hue_without_removing_emoji(&emoji.remove(nick))
+/// Calculate a nick's hue.
+///
+/// This is a reimplementation of [euphoria's nick hue hashing algorithm][0]. It
+/// should always return the same value as the official client's implementation.
+///
+/// [0]: https://github.com/euphoria-io/heim/blob/master/client/lib/hueHash.js
+pub fn hue(emoji: &Emoji, nick: &str) -> u8 {
+    hue_without_removing_emoji(&emoji.remove(nick))
 }