Always use shortest ASCII emoji variation

Signed-off-by: Alik Aslanyan <inline0@pm.me>

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/language/impl/EmojiTransliterator.java

@@ -1,12 +1,34 @@
 package nodomain.freeyourgadget.gadgetbridge.util.language.impl;
 
 import net.fellbaum.jemoji.EmojiManager;
+
+import java.util.Comparator;
 import java.util.Objects;
+
 import nodomain.freeyourgadget.gadgetbridge.util.language.Transliterator;
 
 public class EmojiTransliterator implements Transliterator {
+    private static boolean isAllASCII(String input) {
+        boolean isASCII = true;
+        for (int i = 0; i < input.length(); i++) {
+            int c = input.charAt(i);
+            if (c > 0x7F) {
+                isASCII = false;
+                break;
+            }
+        }
+        return isASCII;
+    }
+
     @Override
     public String transliterate(String txt) {
-        return EmojiManager.replaceAllEmojis(txt, emoji -> Objects.requireNonNullElse(emoji.getAllAliases().get(0), ""));
+        return EmojiManager.replaceAllEmojis(txt, emoji -> Objects.requireNonNullElse(
+                emoji.getAllAliases()
+                        .stream()
+                        .filter(Objects::nonNull)
+                        // This is required, because in another case emoji's will be returned
+                        .filter(EmojiTransliterator::isAllASCII)
+                        .min(Comparator.comparingInt(String::length))
+                        .orElse(""), ""));
     }
 }

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/test/EmojiTransliteratorTest.java

@@ -10,12 +10,12 @@ public class EmojiTransliteratorTest extends TestCase {
 
     @Test
     public void testSimpleEmoji() {
-        Assert.assertEquals(":heart:", new EmojiTransliterator().transliterate("❤\uFE0F"));
+        Assert.assertEquals("<3", new EmojiTransliterator().transliterate("❤\uFE0F"));
         Assert.assertEquals(":grinning:", new EmojiTransliterator().transliterate("\uD83D\uDE00"));
     }
 
     @Test
     public void testCompoundEmoji() {
-        Assert.assertEquals(":factory_worker::skin-tone-4:", new EmojiTransliterator().transliterate("\uD83E\uDDD1\uD83C\uDFFE\u200D\uD83C\uDFED"));
+        Assert.assertEquals(":factory_worker_tone4:", new EmojiTransliterator().transliterate("\uD83E\uDDD1\uD83C\uDFFE\u200D\uD83C\uDFED"));
     }
 }