Perform initial refactoring work

Things that were once singletons are no longer singletons, but are
instead stored in the "Application" singleton

Some singletons still remain, and some renaming/renamespacing is left

src/main.cpp

@@ -17,21 +17,6 @@
 #include <fstream>
 #include <iostream>
 
-#ifdef Q_OS_WIN
-#include <fcntl.h>
-#include <io.h>
-#include <stdio.h>
-#endif
-
-bool isBigEndian()
-{
-    int test = 1;
-    char *p = (char *)&test;
-
-    return p[0] == 0;
-}
-
-void runNativeMessagingHost();
 int runGui(int argc, char *argv[]);
 
 int main(int argc, char *argv[])
@@ -45,7 +30,7 @@ int main(int argc, char *argv[])
 
     // TODO: can be any argument
     if (args.size() > 0 && args[0].startsWith("chrome-extension://")) {
-        runNativeMessagingHost();
+        chatterino::Application::runNativeMessagingHost();
         return 0;
     }
 
@@ -67,18 +52,17 @@ int runGui(int argc, char *argv[])
     a.installNativeEventFilter(new chatterino::util::DpiNativeEventFilter);
 #endif
 
-    // Initialize settings
-    bool success = chatterino::singletons::PathManager::getInstance().init(argc, argv);
-    if (!success) {
-        printf("Error initializing paths\n");
-        return 1;
-    }
-
     // Initialize NetworkManager
     chatterino::util::NetworkManager::init();
 
+    // Initialize application
+    chatterino::Application::instantiate(argc, argv);
+    auto app = chatterino::getApp();
+
+    app->construct();
+
+    auto &pathMan = *app->paths;
     // Running file
-    auto &pathMan = chatterino::singletons::PathManager::getInstance();
     auto runningPath = pathMan.settingsFolderPath + "/running_" + pathMan.appPathHash;
 
     if (QFile::exists(runningPath)) {
@@ -94,16 +78,14 @@ int runGui(int argc, char *argv[])
         runningFile.close();
     }
 
-    // Application
-    {
-        // Initialize application
-        chatterino::Application app;
+    app->initialize();
 
-        // Start the application
-        app.run(a);
+    // Start the application
+    // This is a blocking call
+    app->run(a);
 
-        // Application will go out of scope here and deinitialize itself
-    }
+    // We have finished our application, make sure we save stuff
+    app->save();
 
     // Running file
     QFile::remove(runningPath);
@@ -116,47 +98,3 @@ int runGui(int argc, char *argv[])
 
     _exit(0);
 }
-
-void runNativeMessagingHost()
-{
-#ifdef Q_OS_WIN
-    _setmode(_fileno(stdin), _O_BINARY);
-    _setmode(_fileno(stdout), _O_BINARY);
-#endif
-
-    auto &nmm = chatterino::singletons::NativeMessagingManager::getInstance();
-
-#if 0
-    bool bigEndian = isBigEndian();
-#endif
-
-    while (true) {
-        char size_c[4];
-        std::cin.read(size_c, 4);
-
-        if (std::cin.eof()) {
-            break;
-        }
-
-        uint32_t size = *reinterpret_cast<uint32_t *>(size_c);
-#if 0
-        // To avoid breaking strict-aliasing rules and potentially inducing undefined behaviour, the following code can be run instead
-        uint32_t size = 0;
-        if (bigEndian) {
-            size = size_c[3] | static_cast<uint32_t>(size_c[2]) << 8 |
-                   static_cast<uint32_t>(size_c[1]) << 16 | static_cast<uint32_t>(size_c[0]) << 24;
-        } else {
-            size = size_c[0] | static_cast<uint32_t>(size_c[1]) << 8 |
-                   static_cast<uint32_t>(size_c[2]) << 16 | static_cast<uint32_t>(size_c[3]) << 24;
-        }
-#endif
-
-        char *b = (char *)malloc(size + 1);
-        std::cin.read(b, size);
-        *(b + size) = '\0';
-
-        nmm.sendToGuiProcess(QByteArray(b, size));
-
-        free(b);
-    }
-}