Autocomplete @ mentions in the composer. Closes #103

app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.java

@@ -1,3 +1,18 @@
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
 package com.keylesspalace.tusky.util;
 
 import android.content.ContentResolver;

app/src/main/java/com/keylesspalace/tusky/util/MentionTokenizer.java

@@ -0,0 +1,66 @@
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.util;
+
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.widget.MultiAutoCompleteTextView;
+
+public class MentionTokenizer implements MultiAutoCompleteTextView.Tokenizer {
+    @Override
+    public int findTokenStart(CharSequence text, int cursor) {
+        int i = cursor;
+        while (i > 0 && text.charAt(i - 1) != '@') {
+            i--;
+        }
+        if (i < 1 || text.charAt(i - 1) != '@') {
+            return cursor;
+        }
+        return i;
+    }
+
+    @Override
+    public int findTokenEnd(CharSequence text, int cursor) {
+        int i = cursor;
+        int length = text.length();
+        while (i < length) {
+            if (text.charAt(i) == ' ') {
+                return i;
+            } else {
+                i++;
+            }
+        }
+        return length;
+    }
+
+    @Override
+    public CharSequence terminateToken(CharSequence text) {
+        int i = text.length();
+        while (i > 0 && text.charAt(i - 1) == ' ') {
+            i--;
+        }
+        if (i > 0 && text.charAt(i - 1) == ' ') {
+            return text;
+        } else if (text instanceof Spanned) {
+            SpannableString s = new SpannableString(text + " ");
+            TextUtils.copySpansFrom((Spanned) text, 0, text.length(), Object.class, s, 0);
+            return s;
+        } else {
+            return text + " ";
+        }
+    }
+}