sys: Load Tips from a local file instead of querying an API (#797)

* store tips locally

* C++ random implementation

* show one different tip per day

* fix json conversion to string

* put tips.json in builtin romfs

main/source/init/tasks.cpp

@@ -45,18 +45,6 @@ namespace hex::init {
         return true;
     }
 
-    static bool downloadInformation() {
-        hex::Net net;
-
-        auto tip = net.getString(ImHexApiURL + "/tip"s, 200).get();
-        if (tip.code != 200)
-            return false;
-
-        ImHexApi::System::impl::addInitArgument("tip-of-the-day", tip.body);
-
-        return true;
-    }
-
     bool createDirectories() {
         bool result = true;
 
@@ -319,7 +307,6 @@ namespace hex::init {
             { "Loading settings",        loadSettings,        false },
             { "Loading plugins",         loadPlugins,         false },
             { "Checking for updates",    checkForUpdates,     true  },
-            { "Downloading information", downloadInformation, true  },
             { "Loading fonts",           loadFonts,           true  },
         };
     }

plugins/builtin/romfs/tips.json

@@ -0,0 +1,23 @@
+[
+    {
+        "name" : "ImHex",
+        "tips" : [
+            "Try pressing CTRL + Shift + P to open the command palette!",
+            "The data processor allows pre-processing of the binary input data before it's displayed without modifying the original data.",
+            "Take a closer look at the Splash screen :)",
+            "Check out the WerWolv/ImHex-Patterns repository for pre-made patterns and more!",
+            "ImHex can be easily extended with plugins through its API."
+        ]
+    },
+    {
+        "name" : "Reverse Engineering",
+        "tips" : [
+            "Reverse Engineering a foreign file format becomes a lot easier if you know some values that should be stored in there.",
+            "Ghidra, binwalk, Unicorn, x86dbg, DetectItEasy, Dependencies and CheatEngine are other fantastic and free reverse engineering tools!",
+            "ALWAYS read the documentation if there is one. It will save you a lot of time.",
+            "Tools are what you make of them, practice makes perfect.",
+            "Looking for patterns and repeating structures in binary data is always a good start.",
+            "The entropy graph is an easy way to quickly figure out where interesting data is stored and if the data is encrypted or compressed."
+        ]
+    }
+]

plugins/builtin/source/content/welcome_screen.cpp

@@ -22,6 +22,7 @@
 #include <string>
 #include <list>
 #include <unordered_set>
+#include <random>
 
 namespace hex::plugin::builtin {
 
@@ -549,8 +550,17 @@ namespace hex::plugin::builtin {
             }
         }
 
-        if (ImHexApi::System::getInitArguments().contains("tip-of-the-day")) {
-            s_tipOfTheDay = ImHexApi::System::getInitArguments()["tip-of-the-day"];
+        auto tipsData = romfs::get("tips.json");
+        if(tipsData.valid()){
+            auto tipsCategories = nlohmann::json::parse(tipsData.string());
+
+            auto now = std::chrono::system_clock::now();
+            auto days_since_epoch = std::chrono::duration_cast<std::chrono::days>(now.time_since_epoch());
+            std::mt19937 random(days_since_epoch.count());
+
+            auto chosenCategory = tipsCategories[random()%tipsCategories.size()]["tips"];
+            auto chosenTip = chosenCategory[random()%chosenCategory.size()];
+            s_tipOfTheDay = chosenTip.get<std::string>();
 
             bool showTipOfTheDay = ContentRegistry::Settings::read("hex.builtin.setting.general", "hex.builtin.setting.general.show_tips", 1);
             if (showTipOfTheDay)