Show a message on the main screen if an update is available

src/blupi.cxx

@@ -22,9 +22,15 @@
 #include <argagg/argagg.hpp>
 #include <curl/curl.h>
 #include <iostream>
+#include <iterator>
+#include <sstream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string>
+#include <thread>
+#include <vector>
+
+#include "json.hpp"
 
 #include "blupi.h"
 #include "button.h"
@@ -74,6 +80,25 @@ struct url_data {
   size_t   size;
 };
 
+template <typename Out>
+void split (const std::string & s, char delim, Out result)
+{
+  std::stringstream ss;
+  ss.str (s);
+  std::string item;
+  while (std::getline (ss, item, delim))
+  {
+    *(result++) = item;
+  }
+}
+
+std::vector<std::string> split (const std::string & s, char delim)
+{
+  std::vector<std::string> elems;
+  split (s, delim, std::back_inserter (elems));
+  return elems;
+}
+
 /**
  * \brief Read an integer from a string.
  *
@@ -389,6 +414,28 @@ static void HandleEvent (const SDL_Event & event)
       break;
     }
 
+    case EV_CHECKUPDATE:
+    {
+      std::string * data = static_cast<std::string *> (event.user.data1);
+
+      using json    = nlohmann::json;
+      json jsonData = json::parse (*data);
+
+      /* Check if the remote version is newer */
+      std::vector<std::string>  list = split (jsonData["version"], '.');
+      std::vector<unsigned int> version (3);
+      std::transform (
+        list.begin (), list.end (), version.begin (),
+        [](const std::string & s) -> unsigned int { return std::stoi (s); });
+
+      if (
+        PB_VERSION_INT (version[0], version[1], version[2]) >
+        PLANETBLUPI_VERSION_INT)
+        g_pEvent->SetUpdateVersion (jsonData["version"]);
+
+      delete data;
+    }
+
     case EV_MUSIC_STOP:
       if (g_pSound->IsStoppedOnDemand ())
         break;

src/blupi.h

@@ -56,10 +56,13 @@ typedef Sint32 LPARAM;
 
 #define PB_STRINGIFY(s) #s
 #define PB_TOSTRING(s) PB_STRINGIFY (s)
+#define PB_VERSION_INT(a, b, c) (a << 16 | b << 8 | c)
 #define PB_VERSION_DOT(a, b, c) a##.##b##.##c
 #define PB_VERSION(a, b, c) PB_VERSION_DOT (a, b, c)
 #define PLANETBLUPI_VERSION \
   PB_VERSION (PB_VERSION_MAJOR, PB_VERSION_MINOR, PB_VERSION_PATCH)
+#define PLANETBLUPI_VERSION_INT \
+  PB_VERSION_INT (PB_VERSION_MAJOR, PB_VERSION_MINOR, PB_VERSION_PATCH)
 #define PLANETBLUPI_VERSION_STR PB_TOSTRING (PLANETBLUPI_VERSION)
 
 #ifdef _WIN32

src/event.cxx

@@ -1590,6 +1590,8 @@ CEvent::CEvent ()
     m_Lang = m_Languages.begin () + 3;
   else
     m_Lang = m_Languages.begin ();
+
+  m_updateBlinking = 0;
 }
 
 // Destructeur.
@@ -1870,6 +1872,11 @@ void AddCheatCode (char * pDst, char * pSrc)
   pDst[j] = 0;
 }
 
+void CEvent::SetUpdateVersion (const std::string & version)
+{
+  this->m_updateVersion = version;
+}
+
 // Dessine un texte multi-lignes centré.
 
 void CEvent::DrawTextCenter (const char * text, Sint32 x, Sint32 y, Sint32 font)
@@ -1945,6 +1952,17 @@ bool CEvent::DrawButtons ()
       res, sizeof (res), "%s %u.%u.%u", gettext ("Version"), PB_VERSION_MAJOR,
       PB_VERSION_MINOR, PB_VERSION_PATCH);
     DrawText (m_pPixmap, pos, res, FONTLITTLE);
+
+    if (!this->m_updateVersion.empty () && this->m_updateBlinking++ % 80 < 40)
+    {
+      pos.x = 70;
+      pos.y = 465;
+      snprintf (
+        res, sizeof (res),
+        gettext ("New version available for download on www.blupi.org (v%s)"),
+        this->m_updateVersion.c_str ());
+      DrawText (m_pPixmap, pos, res, FONTLITTLE);
+    }
   }
 
   if (m_phase == EV_PHASE_SETUP || m_phase == EV_PHASE_SETUPp)

src/event.h

@@ -129,8 +129,8 @@ public:
   void IntroStep ();
 
   Uint8 GetWindowScale ();
+  void  SetUpdateVersion (const std::string & version);
 
-public:
   static void PushUserEvent (Sint32 code, void * data = nullptr);
 
 protected:
@@ -247,6 +247,8 @@ protected:
   Uint16                                   m_keymod;
   POINT                                    m_debugPos;
   Sint32                                   m_introTime;
+  Sint32                                   m_updateBlinking;
+  std::string                              m_updateVersion;
 };
 
 /////////////////////////////////////////////////////////////////////////////