Add key shortcut to add to favgroup

app/assets/javascripts/favorite_groups.js

@@ -0,0 +1,44 @@
+(function() {
+  Danbooru.FavoriteGroup = {};
+
+  Danbooru.FavoriteGroup.initialize_all = function() {
+    if ($("#c-posts").length && $("#a-show").length) {
+      this.initialize_add_to_favgroup_dialog();
+      $(document).bind("keydown", "1 2 3 4 5 6 7 8 9 0", Danbooru.FavoriteGroup.add_to_favgroup);
+    }
+  }
+
+  Danbooru.FavoriteGroup.initialize_add_to_favgroup_dialog = function() {
+    $("#add-to-favgroup-dialog").dialog({
+      autoOpen: false,
+      width: 500,
+      buttons: {
+        "Cancel": function() {
+          $(this).dialog("close");
+        }
+      }
+    });
+
+    $(document).bind("keydown", "g", function(e) {
+      if ($(".add-to-favgroup").length === 1) {
+        // If the user only has one favorite group we don't need to ask which group to add the post to.
+        $(".add-to-favgroup").click();
+      } else if ($(".add-to-favgroup").length > 1) {
+        $("#add-to-favgroup-dialog").dialog("open");
+      }
+      e.preventDefault();
+    });
+  }
+
+  Danbooru.FavoriteGroup.add_to_favgroup = function(e) {
+    var favgroup_index = String.fromCharCode(e.which);
+    var link = $("#add-to-favgroup-" + favgroup_index + ":visible");
+    if (link.length) {
+      link.click();
+    }
+  }
+})();
+
+$(function() {
+  Danbooru.FavoriteGroup.initialize_all();
+});