Add all emoji the vanilla client knows

src/emoji.rs

@@ -0,0 +1,43 @@
+//! All emoji the vanilla euphoria.io client knows.
+
+use std::collections::HashMap;
+
+const EMOJI_RAW: &str = include_str!("emoji.txt");
+
+/// A map from emoji names to their unicode representation. Not all emojis have
+/// such a representation.
+pub struct Emoji(pub HashMap<String, Option<String>>);
+
+fn parse_hex_to_char(hex: &str) -> char {
+    u32::from_str_radix(hex, 16).unwrap().try_into().unwrap()
+}
+
+fn parse_line(line: &str) -> (String, Option<String>) {
+    let mut line = line.split_ascii_whitespace();
+    let name = line.next().unwrap().to_string();
+    let unicode = line.map(parse_hex_to_char).collect::<String>();
+    let unicode = Some(unicode).filter(|u| !u.is_empty());
+    (name, unicode)
+}
+
+impl Emoji {
+    pub fn load() -> Self {
+        let map = EMOJI_RAW
+            .lines()
+            .map(|l| l.trim())
+            .filter(|l| !l.is_empty() && !l.starts_with('#'))
+            .map(parse_line)
+            .collect();
+        Self(map)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Emoji;
+
+    #[test]
+    fn load_without_panic() {
+        Emoji::load();
+    }
+}