Add option for random mod load order (#14637)

builtin/settingtypes.txt

@@ -1761,6 +1761,9 @@ deprecated_lua_api_handling (Deprecated Lua API handling) enum log none,log,erro
 #    Enable random user input (only used for testing).
 random_input (Random input) bool false
 
+#    Enable random mod loading (mainly used for testing).
+random_mod_load_order (Random mod load order) bool false
+
 #    Enable mod channels support.
 enable_mod_channels (Mod channels) bool false
 

src/content/mod_configuration.cpp

@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 #include "gettext.h"
 #include "exceptions.h"
+#include "util/numeric.h"
 
 
 std::string ModConfiguration::getUnsatisfiedModsError() const
@@ -226,6 +227,15 @@ void ModConfiguration::resolveDependencies()
 		modnames.insert(mod.name);
 	}
 
+	// Step 1.5 (optional): shuffle unsatisfied mods so non declared depends get found by their devs
+	if (g_settings->getBool("random_mod_load_order")) {
+		MyRandGenerator rg;
+		std::shuffle(m_unsatisfied_mods.begin(),
+			m_unsatisfied_mods.end(),
+			rg
+		);
+	}
+
 	// Step 2: get dependencies (including optional dependencies)
 	// of each mod, split mods into satisfied and unsatisfied
 	std::vector<ModSpec> satisfied;

src/defaultsettings.cpp

@@ -419,6 +419,11 @@ void set_default_settings()
 	// Server
 	settings->setDefault("disable_escape_sequences", "false");
 	settings->setDefault("strip_color_codes", "false");
+#ifndef NDEBUG
+	settings->setDefault("random_mod_load_order", "true");
+#else
+	settings->setDefault("random_mod_load_order", "false");
+#endif
 #if USE_PROMETHEUS
 	settings->setDefault("prometheus_listener_address", "127.0.0.1:30000");
 #endif