core: Add support for hyprqtutils' update screen (#8651)

* Nix: add hyprland-qtutils to PATH

* flake.lock: update

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

src/helpers/MiscFunctions.cpp

@@ -930,4 +930,34 @@ float stringToPercentage(const std::string& VALUE, const float REL) {
         return (std::stof(VALUE.substr(0, VALUE.length() - 1)) * REL) / 100.f;
     else
         return std::stof(VALUE);
-};
+}
+
+bool executableExistsInPath(const std::string& exe) {
+    if (!getenv("PATH"))
+        return false;
+
+    static CVarList paths(getenv("PATH"), 0, ':', true);
+
+    for (auto& p : paths) {
+        std::string     path = p + std::string{"/"} + exe;
+        std::error_code ec;
+        if (!std::filesystem::exists(path, ec) || ec)
+            continue;
+
+        if (!std::filesystem::is_regular_file(path, ec) || ec)
+            continue;
+
+        auto stat = std::filesystem::status(path, ec);
+        if (ec)
+            continue;
+
+        auto perms = stat.permissions();
+
+        if (std::filesystem::perms::none == (perms & std::filesystem::perms::others_exec))
+            return false;
+
+        return true;
+    }
+
+    return false;
+}