Support ruleset-defined custom actions in client

User Action 1 through 3 may be defined by the ruleset, allow ordering
 them through the action selection dialog.
Action Target Kind depends on the ruleset, so dispatch on it at
 runtime to determine the semantics of qv2.

Closes #936.

client/gui-qt/dialogs.cpp

@@ -143,6 +143,9 @@ static void transport_alight(QVariant data1, QVariant data2);
 static void transport_unload(QVariant data1, QVariant data2);
 static void keep_moving(QVariant data1, QVariant data2);
 static void pillage_something(QVariant data1, QVariant data2);
+static void user_action_1(QVariant data1, QVariant data2);
+static void user_action_2(QVariant data1, QVariant data2);
+static void user_action_3(QVariant data1, QVariant data2);
 static void action_entry(choice_dialog *cd, action_id act,
                          const struct act_prob *act_probs,
                          const QString custom, QVariant data1,
@@ -253,6 +256,11 @@ static const QHash<action_id, pfcn_void> af_map_init()
   action_function[ACTION_FORTIFY] = fortify;
   action_function[ACTION_CONVERT] = convert_unit;
 
+  // Unit target depends on ruleset
+  action_function[ACTION_USER_ACTION1] = user_action_1;
+  action_function[ACTION_USER_ACTION2] = user_action_2;
+  action_function[ACTION_USER_ACTION3] = user_action_3;
+
   return action_function;
 }
 
@@ -3114,6 +3122,106 @@ static void pillage_something(QVariant data1, QVariant data2)
   ::is_showing_pillage_dialog = false;
 }
 
+/**
+  User action with target kind ATK_UNIT
+ */
+static void user_action_unit_vs_unit(int actor_id, int target_id,
+                                     action_id act_id)
+{
+  if (NULL != game_unit_by_number(actor_id)
+      && NULL != game_unit_by_number(target_id)) {
+    request_do_action(act_id, actor_id, target_id, 0, "");
+  }
+}
+
+/**
+  User action with target kind ATK_CITY
+ */
+static void user_action_unit_vs_city(int actor_id, int target_id,
+                                     action_id act_id)
+{
+  if (NULL != game_unit_by_number(actor_id)
+      && NULL != game_city_by_number(target_id)) {
+    request_do_action(act_id, actor_id, target_id, 0, "");
+  }
+}
+
+/**
+  User action with target kind ATK_TILE or ATK_UNITS
+ */
+static void user_action_unit_vs_tile(int actor_id, int target_id,
+                                     action_id act_id)
+{
+  if (NULL != game_unit_by_number(actor_id)
+      && NULL != index_to_tile(&(wld.map), target_id)) {
+    request_do_action(act_id, actor_id, target_id, 0, "");
+  }
+}
+
+/**
+  User action with target kind ATK_SELF
+ */
+static void user_action_unit_vs_self(int actor_id, int target_id,
+                                     action_id act_id)
+{
+  if (NULL != game_unit_by_number(actor_id)) {
+    request_do_action(act_id, actor_id, target_id, 0, "");
+  }
+}
+
+/**
+  User action handler, dispatches on target kind
+ */
+static void user_action(QVariant data1, QVariant data2, action_id act_id)
+{
+  int actor_id = data1.toInt();
+  int target_id = data2.toInt();
+
+  switch (action_id_get_target_kind(act_id)) {
+  case ATK_UNIT:
+    user_action_unit_vs_unit(actor_id, target_id, act_id);
+    break;
+  case ATK_CITY:
+    user_action_unit_vs_city(actor_id, target_id, act_id);
+    break;
+  case ATK_TILE:
+  case ATK_UNITS:
+    user_action_unit_vs_tile(actor_id, target_id, act_id);
+    break;
+  case ATK_SELF:
+    user_action_unit_vs_self(actor_id, target_id, act_id);
+    break;
+  case ATK_COUNT:
+    fc_assert_msg(ATK_COUNT != action_id_get_target_kind(act_id),
+                  "Bad target kind");
+    break;
+  }
+}
+
+/**
+   User Action 1 for choice dialog
+ */
+static void user_action_1(QVariant data1, QVariant data2)
+{
+  user_action(data1, data2, ACTION_USER_ACTION1);
+}
+
+/**
+   User Action 2 for choice dialog
+ */
+static void user_action_2(QVariant data1, QVariant data2)
+{
+  user_action(data1, data2, ACTION_USER_ACTION2);
+}
+
+/**
+   User Action 3 for choice dialog
+ */
+static void user_action_3(QVariant data1, QVariant data2)
+{
+  user_action(data1, data2, ACTION_USER_ACTION3);
+}
+
 /**
    Action sabotage with spy for choice dialog
  */