Add Emoji Search, Sticker Search, and GIF Keyboard.

Co-authored-by: Alex Hart <alex@signal.org>
Co-authored-by: Cody Henthorne <cody@signal.org>
Co-authored-by: ⁨Greyson Parrelli<greyson@signal.org>

app/src/main/java/org/thoughtcrime/securesms/util/FtsUtil.java

@@ -0,0 +1,71 @@
+package org.thoughtcrime.securesms.util;
+
+import android.database.DatabaseUtils;
+
+import androidx.annotation.NonNull;
+
+import com.annimon.stream.Stream;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public final class FtsUtil {
+  private static final Set<Character> BANNED_CHARACTERS = new HashSet<>();
+  static {
+    // Several ranges of invalid ASCII characters
+    for (int i = 33; i <= 47; i++) {
+      BANNED_CHARACTERS.add((char) i);
+    }
+    for (int i = 58; i <= 64; i++) {
+      BANNED_CHARACTERS.add((char) i);
+    }
+    for (int i = 91; i <= 96; i++) {
+      BANNED_CHARACTERS.add((char) i);
+    }
+    for (int i = 123; i <= 126; i++) {
+      BANNED_CHARACTERS.add((char) i);
+    }
+  }
+
+  private FtsUtil() {}
+
+  /**
+   * Unfortunately {@link DatabaseUtils#sqlEscapeString(String)} is not sufficient for our purposes.
+   * MATCH queries have a separate format of their own that disallow most "special" characters.
+   *
+   * Also, SQLite can't search for apostrophes, meaning we can't normally find words like "I'm".
+   * However, if we replace the apostrophe with a space, then the query will find the match.
+   */
+  public static @NonNull String sanitize(@NonNull String query) {
+    StringBuilder out = new StringBuilder();
+
+    for (int i = 0; i < query.length(); i++) {
+      char c = query.charAt(i);
+      if (!BANNED_CHARACTERS.contains(c)) {
+        out.append(c);
+      } else if (c == '\'') {
+        out.append(' ');
+      }
+    }
+
+    return out.toString();
+  }
+
+  /**
+   * Sanitizes the string (via {@link #sanitize(String)}) and appends * at the right spots such that each token in the query will be treated as a prefix.
+   */
+  public static @NonNull String createPrefixMatchString(@NonNull String query) {
+    query = FtsUtil.sanitize(query);
+
+    return Stream.of(query.split(" "))
+                 .map(String::trim)
+                 .filter(s -> s.length() > 0)
+                 .map(FtsUtil::fixQuotes)
+                 .collect(StringBuilder::new, (sb, s) -> sb.append(s).append("* "))
+                 .toString();
+  }
+
+  private static String fixQuotes(String s) {
+    return "\"" + s.replace("\"", "\"\"") + "\"";
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/util/TextSecurePreferences.java

@@ -1292,6 +1292,6 @@ public class TextSecurePreferences {
 
   // NEVER rename these -- they're persisted by name
   public enum MediaKeyboardMode {
-    EMOJI, STICKER
+    EMOJI, STICKER, GIF
   }
 }

app/src/main/java/org/thoughtcrime/securesms/util/ViewExtensions.kt

@@ -0,0 +1,12 @@
+package org.thoughtcrime.securesms.util
+
+import android.view.View
+
+var View.visible: Boolean
+  get() {
+    return this.visibility == View.VISIBLE
+  }
+
+  set(value) {
+    this.visibility = if (value) View.VISIBLE else View.GONE
+  }