ClipboardHistory: Use config file to set number of history items

The number of items in history was hardcoded to 20 earlier, now
we try to load this value from a config file. The default if none
is available is still 20.

Userland/Applets/ClipboardHistory/CMakeLists.txt

@@ -10,4 +10,4 @@ set(SOURCES
 )
 
 serenity_app(ClipboardHistory.Applet ICON edit-copy)
-target_link_libraries(ClipboardHistory.Applet LibGUI LibCore LibGfx)
+target_link_libraries(ClipboardHistory.Applet LibGUI LibCore LibGfx LibConfig)

Userland/Applets/ClipboardHistory/ClipboardHistoryModel.cpp

@@ -1,10 +1,12 @@
 /*
  * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * Copyright (c) 2021, Mustafa Quraish <mustafa@cs.toronto.edu>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include "ClipboardHistoryModel.h"
+#include <LibConfig/Client.h>
 #include <AK/NumberFormat.h>
 #include <AK/StringBuilder.h>
 
@@ -13,6 +15,11 @@ NonnullRefPtr<ClipboardHistoryModel> ClipboardHistoryModel::create()
     return adopt_ref(*new ClipboardHistoryModel());
 }
 
+ClipboardHistoryModel::ClipboardHistoryModel()
+    : m_history_limit(Config::read_i32("ClipboardHistory", "ClipboardHistory", "NumHistoryItems", 20))
+{
+}
+
 ClipboardHistoryModel::~ClipboardHistoryModel()
 {
 }

Userland/Applets/ClipboardHistory/ClipboardHistoryModel.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * Copyright (c) 2021, Mustafa Quraish <mustafa@cs.toronto.edu>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -28,6 +29,7 @@ public:
     void remove_item(int index);
 
 private:
+    ClipboardHistoryModel();
     void add_item(const GUI::Clipboard::DataAndType& item);
 
     // ^GUI::Model
@@ -40,5 +42,5 @@ private:
     virtual void clipboard_content_did_change(const String&) override { add_item(GUI::Clipboard::the().data_and_type()); }
 
     Vector<GUI::Clipboard::DataAndType> m_history_items;
-    size_t m_history_limit { 20 };
+    size_t m_history_limit;
 };

Userland/Applets/ClipboardHistory/main.cpp

@@ -5,6 +5,7 @@
  */
 
 #include "ClipboardHistoryModel.h"
+#include <LibConfig/Client.h>
 #include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/ImageWidget.h>
@@ -23,6 +24,8 @@ int main(int argc, char* argv[])
 
     auto app = GUI::Application::construct(argc, argv);
 
+    Config::pledge_domains("ClipboardHistory");
+
     if (pledge("stdio recvfd sendfd rpath", nullptr) < 0) {
         perror("pledge");
         return 1;