Cvars: Add OnCvarChanged global forward

I really tried to use "cvar_changed" as name, but it bothered me so much to look that weird I could not keep it.

amxmodx/amxmodx.h

@@ -329,6 +329,8 @@ extern int FF_PluginEnd;
 extern int FF_InconsistentFile;
 extern int FF_ClientAuthorized;
 extern int FF_ChangeLevel;
+extern int FF_CvarChanged;
+
 extern bool g_coloredmenus;
 
 typedef void (*AUTHORIZEFUNC)(int player, const char *authstring);

amxmodx/cvars.cpp

@@ -15,7 +15,16 @@ CDetour *Cvar_DirectSetDetour;
 
 DETOUR_DECL_STATIC2(Cvar_DirectSet, void, struct cvar_s*, var, const char*, value)
 {
-	printf("Cvar_DirectSet - %s -> %s\n", var->name, value);
+	if (var && value)
+	{
+		if (strcmp(var->string, value) != 0)
+		{
+			if (executeForwards(FF_CvarChanged, reinterpret_cast<cell>(var), var->string, value, var->name) > 0)
+			{
+				return;
+			}
+		}
+	}
 
 	DETOUR_STATIC_CALL(Cvar_DirectSet)(var, value);
 }

amxmodx/meta_api.cpp

@@ -143,6 +143,7 @@ int FF_PluginEnd = -1;
 int FF_InconsistentFile = -1;
 int FF_ClientAuthorized = -1;
 int FF_ChangeLevel = -1;
+int FF_CvarChanged = -1;
 
 bool ColoredMenus(String & ModName)
 {
@@ -503,6 +504,7 @@ int	C_Spawn(edict_t *pent)
 	FF_InconsistentFile = registerForward("inconsistent_file", ET_STOP, FP_CELL, FP_STRING, FP_STRINGEX, FP_DONE);
 	FF_ClientAuthorized = registerForward("client_authorized", ET_IGNORE, FP_CELL, FP_DONE);
 	FF_ChangeLevel = registerForward("server_changelevel", ET_STOP, FP_STRING, FP_DONE);
+	FF_CvarChanged = registerForward("OnCvarChanged", ET_STOP, FP_CELL, FP_STRING, FP_STRING, FP_STRING, FP_DONE);
 
 #if defined BINLOG_ENABLED
 	if (!g_BinLog.Open())

plugins/include/amxmodx.inc

@@ -29,6 +29,7 @@
 #include <newmenus>
 #include <textparse_smc>
 #include <textparse_ini>
+#include <cvars>
 
 /**
  * Called just after server activation.

plugins/include/cvars.inc

@@ -0,0 +1,23 @@
+// vim: set ts=4 sw=4 tw=99 noet:
+//
+// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
+// Copyright (C) The AMX Mod X Development Team.
+//
+// This software is licensed under the GNU General Public License, version 3 or higher.
+// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
+//     https://alliedmods.net/amxmodx-license
+
+#if defined _cvars_included
+	#endinput
+#endif
+#define _cvars_included
+
+/**
+ * Called when a console variable's value is changed.
+ * 
+ * @param cvarHandle    Handle to the cvar that was changed
+ * @param oldValue      String containing the value of the cvar before it was changed
+ * @param newValue      String containing the new value of the cvar
+ * @param cvarName      String containing the name of the cvar
+ */
+forward OnCvarChanged(cvarHandle, const oldValue[], const newValue[], const cvarName[]);

support/PackageScript

@@ -245,6 +245,7 @@ scripting_files = [
   'include/csstats.inc',
   'include/cstrike.inc',
   'include/csx.inc',
+  'include/cvars.inc',
   'include/datapack.inc',
   'include/dbi.inc',
   'include/dodconst.inc',