FilterEngine API improvements

shell/src/FiltersCommand.cpp

+#include <iostream>
+#include <sstream>
+
+#include "FiltersCommand.h"
+
+namespace
+{
+  typedef std::vector<AdblockPlus::Filter*> FilterList;
+
+  void ShowFilterList(const FilterList& filters)
+  {
+    for (FilterList::const_iterator it = filters.begin();
+         it != filters.end(); it++)
+    {
+      std::cout << (*it)->GetProperty("text", "(no text)") << " - " <<
+          (*it)->GetProperty("type", "(no type)") << std::endl;
+    }
+  }
+}
+
+FiltersCommand::FiltersCommand(
+  AdblockPlus::FilterEngine& filterEngine)
+  : Command("filters"), filterEngine(filterEngine)
+{
+}
+
+void FiltersCommand::operator()(const std::string& arguments)
+{
+  std::istringstream argumentStream(arguments);
+  std::string action;
+  argumentStream >> action;
+  if (!action.size())
+  {
+    ShowFilters();
+    return;
+  }
+
+  if (action == "add")
+  {
+    std::string text;
+    std::getline(argumentStream, text);
+    if (text.size())
+      AddFilter(text);
+    else
+      ShowUsage();
+  }
+  else if (action == "remove")
+  {
+    std::string text;
+    std::getline(argumentStream, text);
+    if (text.size())
+      RemoveFilter(text);
+    else
+      ShowUsage();
+  }
+  else
+    throw NoSuchCommandError(name + " " + action);
+}
+
+std::string FiltersCommand::GetDescription() const
+{
+  return "List and manage custom filters";
+}
+
+std::string FiltersCommand::GetUsage() const
+{
+  return name + " [add FILTER|remove FILTER]";
+}
+
+void FiltersCommand::ShowFilters()
+{
+  ShowFilterList(filterEngine.GetListedFilters());
+}
+
+void FiltersCommand::AddFilter(const std::string& text)
+{
+  AdblockPlus::Filter& filter = filterEngine.GetFilter(text);
+  filter.AddToList();
+}
+
+void FiltersCommand::RemoveFilter(const std::string& text)
+{
+  AdblockPlus::Filter& filter = filterEngine.GetFilter(text);
+  if (!filter.IsListed())
+  {
+    std::cout << "No such filter '" << text << "'" << std::endl;
+    return;
+  }
+  filter.RemoveFromList();
+}