Make a command that shows the Chatterino user card (/usercard) (#1375)

* Make UserInfoPopup be able to show that fetching the information failed.

src/providers/twitch/PartialTwitchUser.cpp

@@ -27,6 +27,13 @@ PartialTwitchUser PartialTwitchUser::byId(const QString &id)
 
 void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
                               const QObject *caller)
+{
+    getId(
+        successCallback, [] {}, caller);
+}
+void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
+                              std::function<void()> failureCallback,
+                              const QObject *caller)
 {
     assert(!this->username_.isEmpty());
 
@@ -34,12 +41,13 @@ void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
                    this->username_)
         .caller(caller)
         .authorizeTwitchV5(getDefaultClientID())
-        .onSuccess([successCallback](auto result) -> Outcome {
+        .onSuccess([successCallback, failureCallback](auto result) -> Outcome {
             auto root = result.parseJson();
             if (!root.value("users").isArray())
             {
                 qDebug()
                     << "API Error while getting user id, users is not an array";
+                failureCallback();
                 return Failure;
             }
 
@@ -48,12 +56,14 @@ void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
             {
                 qDebug() << "API Error while getting user id, users array size "
                             "is not 1";
+                failureCallback();
                 return Failure;
             }
             if (!users[0].isObject())
             {
                 qDebug() << "API Error while getting user id, first user is "
                             "not an object";
+                failureCallback();
                 return Failure;
             }
             auto firstUser = users[0].toObject();
@@ -62,6 +72,7 @@ void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
             {
                 qDebug() << "API Error: while getting user id, first user "
                             "object `_id` key is not a string";
+                failureCallback();
                 return Failure;
             }
             successCallback(id.toString());

src/providers/twitch/PartialTwitchUser.hpp

@@ -21,6 +21,10 @@ public:
 
     void getId(std::function<void(QString)> successCallback,
                const QObject *caller = nullptr);
+
+    void getId(std::function<void(QString)> successCallback,
+               std::function<void()> failureCallback,
+               const QObject *caller = nullptr);
 };
 
 }  // namespace chatterino