feat: Add additional 'smart text' replacements

shared/editor/plugins/SmartText.ts

@@ -2,6 +2,11 @@ import { ellipsis, smartQuotes, InputRule } from "prosemirror-inputrules";
 import Extension from "../lib/Extension";
 
 const rightArrow = new InputRule(/->$/, "→");
+const oneHalf = new InputRule(/1\/2$/, "½");
+const threeQuarters = new InputRule(/3\/4$/, "¾");
+const copyright = new InputRule(/\(c\)$/, "©️");
+const registered = new InputRule(/\(r\)$/, "®️");
+const trademarked = new InputRule(/\(tm\)$/, "™️");
 
 export default class SmartText extends Extension {
   get name() {
@@ -9,6 +14,15 @@ export default class SmartText extends Extension {
   }
 
   inputRules() {
-    return [rightArrow, ellipsis, ...smartQuotes];
+    return [
+      rightArrow,
+      oneHalf,
+      threeQuarters,
+      copyright,
+      registered,
+      trademarked,
+      ellipsis,
+      ...smartQuotes,
+    ];
   }
 }