From 54aa43c81b4adbaaf1eaab03062fa871d85fbeab Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Mon, 13 Aug 2012 19:22:26 +0000
Subject: (svn r24468) -Add [FS#5219]: API compatibility scripts for Goal
 Scripts (Hirundo)

---
 src/script/script_instance.cpp | 23 +++++++++++++++++++++++
 src/script/script_instance.hpp | 10 ++++++++++
 2 files changed, 33 insertions(+)

(limited to 'src/script')

diff --git a/src/script/script_instance.cpp b/src/script/script_instance.cpp
index 5b515c52f..95fcf6f0d 100644
--- a/src/script/script_instance.cpp
+++ b/src/script/script_instance.cpp
@@ -27,6 +27,7 @@
 
 #include "../company_base.h"
 #include "../company_func.h"
+#include "../fileio_func.h"
 
 ScriptStorage::~ScriptStorage()
 {
@@ -104,6 +105,28 @@ void ScriptInstance::RegisterAPI()
 	squirrel_register_std(this->engine);
 }
 
+bool ScriptInstance::LoadCompatibilityScripts(const char *api_version, Subdirectory dir)
+{
+	char script_name[32];
+	seprintf(script_name, lastof(script_name), "compat_%s.nut", api_version);
+	char buf[MAX_PATH];
+	Searchpath sp;
+	FOR_ALL_SEARCHPATHS(sp) {
+		FioAppendDirectory(buf, MAX_PATH, sp, dir);
+		ttd_strlcat(buf, script_name, MAX_PATH);
+		if (!FileExists(buf)) continue;
+
+		if (this->engine->LoadScript(buf)) return true;
+
+		ScriptLog::Error("Failed to load API compatibility script");
+		DEBUG(script, 0, "Error compiling / running API compatibility script: %s", buf);
+		return false;
+	}
+
+	ScriptLog::Warning("API compatibility script not found");
+	return true;
+}
+
 ScriptInstance::~ScriptInstance()
 {
 	ScriptObject::ActiveInstance active(this);
diff --git a/src/script/script_instance.hpp b/src/script/script_instance.hpp
index 7a02237b8..0cda170f4 100644
--- a/src/script/script_instance.hpp
+++ b/src/script/script_instance.hpp
@@ -17,6 +17,7 @@
 
 #include "../command_type.h"
 #include "../company_type.h"
+#include "../fileio_type.h"
 
 static const uint SQUIRREL_MAX_DEPTH = 25; ///< The maximum recursive depth for items stored in the savegame.
 
@@ -176,12 +177,21 @@ public:
 
 protected:
 	class Squirrel *engine;               ///< A wrapper around the squirrel vm.
+	const char *versionAPI;               ///< Current API used by this script.
 
 	/**
 	 * Register all API functions to the VM.
 	 */
 	virtual void RegisterAPI();
 
+	/**
+	 * Load squirrel scripts to emulate an older API.
+	 * @param api_version: API version to load scripts for
+	 * @param dir Subdirectory to find the scripts in
+	 * @return true iff script loading should proceed
+	 */
+	bool LoadCompatibilityScripts(const char *api_version, Subdirectory dir);
+
 	/**
 	 * Tell the script it died.
 	 */
-- 
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