(svn r16927) -Change: make the 'there is no AI' error message translatable

2 files changed, 40 insertions, 15 deletions

diff --git a/src/ai/ai_info_dummy.cpp b/src/ai/ai_info_dummy.cpp
index 109e7b3a0..2a6f29732 100644
--- a/src/ai/ai_info_dummy.cpp
+++ b/src/ai/ai_info_dummy.cpp
@@ -5,6 +5,10 @@
 #include <squirrel.h>
 #include "../stdafx.h"
 
+#include "../string_func.h"
+#include "../strings_func.h"
+#include "table/strings.h"
+
 /* The reason this exists in C++, is that a user can trash his ai/ dir,
  *  leaving no AIs available. The complexity to solve this is insane, and
  *  therefor the alternative is used, and make sure there is always an AI
@@ -14,7 +18,7 @@
  *  to select manual. It is a fail-over in case no AIs are available.
  */
 
-const SQChar dummy_script_info[] = _SC("                                                        \n\
+const SQChar _dummy_script_info[] = _SC("                                                       \n\
 class DummyAI extends AIInfo {                                                                  \n\
   function GetAuthor()      { return \"OpenTTD NoAI Developers Team\"; }                        \n\
   function GetName()        { return \"DummyAI\"; }                                             \n\
@@ -28,22 +32,12 @@ class DummyAI extends AIInfo {
 RegisterDummyAI(DummyAI());                                                                     \n\
 ");
 
-const SQChar dummy_script[] = _SC("                                                             \n\
-class DummyAI extends AIController {                                                            \n\
-  function Start() {                                                                            \n\
-    AILog.Error(\"No suitable AI found to load.\");                                             \n\
-    AILog.Error(\"This AI is a dummy AI and won't do anything.\");                              \n\
-    AILog.Error(\"You can download several AIs via the 'Online Content' system.\");             \n\
-  }                                                                                             \n\
-}                                                                                               \n\
-");
-
 void AI_CreateAIInfoDummy(HSQUIRRELVM vm)
 {
 	sq_pushroottable(vm);
 
 	/* Load and run the script */
-	if (SQ_SUCCEEDED(sq_compilebuffer(vm, dummy_script_info, scstrlen(dummy_script_info), _SC("dummy"), SQTrue))) {
+	if (SQ_SUCCEEDED(sq_compilebuffer(vm, _dummy_script_info, scstrlen(_dummy_script_info), _SC("dummy"), SQTrue))) {
 		sq_push(vm, -2);
 		if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
 			sq_pop(vm, 1);
@@ -55,10 +49,40 @@ void AI_CreateAIInfoDummy(HSQUIRRELVM vm)
 
 void AI_CreateAIDummy(HSQUIRRELVM vm)
 {
-	sq_pushroottable(vm);
+	/* We want to translate the error message.
+	 * We do this in three steps:
+	 * 1) We get the error message
+	 */
+	char error_message[1024];
+	GetString(error_message, STR_AI_NO_AI_FOUND, lastof(error_message));
 
-	/* Load and run the script */
-	if (SQ_SUCCEEDED(sq_compilebuffer(vm, dummy_script, scstrlen(dummy_script), _SC("dummy"), SQTrue))) {
+	/* 2) We construct the AI's code. This is done by merging a header, body and footer */
+	char dummy_script[4096];
+	char *dp = dummy_script;
+	dp = strecpy(dp, "class DummyAI extends AIController {\n  function Start() {\n", lastof(dummy_script));
+
+	/* As special trick we need to split the error message on newlines and
+	 * emit each newline as a separate error printing string. */
+	char *newline;
+	char *p = error_message;
+	do {
+		newline = strchr(p, '\n');
+		if (newline != NULL) *newline = '\0';
+
+		dp += seprintf(dp, lastof(dummy_script), "    AILog.Error(\"%s\");\n", p);
+		p = newline + 1;
+	} while (newline != NULL);
+
+	dp = strecpy(dp, "  }\n}\n", lastof(dummy_script));
+
+	/* 3) We translate the error message in the character format that Squirrel wants.
+	 *    We can use the fact that the wchar string printing also uses %s to print
+	 *    old style char strings, which is what was generated during the script generation. */
+	const SQChar *sq_dummy_script = OTTD2FS(dummy_script);
+
+	/* And finally we load and run the script */
+	sq_pushroottable(vm);
+	if (SQ_SUCCEEDED(sq_compilebuffer(vm, sq_dummy_script, scstrlen(sq_dummy_script), _SC("dummy"), SQTrue))) {
 		sq_push(vm, -2);
 		if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
 			sq_pop(vm, 1);
diff --git a/src/lang/english.txt b/src/lang/english.txt
index 7a5354ec5..0547e3439 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -3609,6 +3609,7 @@ STR_AI_AUTHOR                                                   :{BLACK}Author:
 STR_AI_VERSION                                                  :{BLACK}Version: {NUM}
 STR_AI_URL                                                      :{BLACK}URL: {RAW_STRING}
 STR_AI_PLEASE_REPORT_CRASH                                      :{WHITE}One of the running AIs crashed. Please report this to the AI author with a screenshot of the AI Debug Window.
+STR_AI_NO_AI_FOUND                                              :No suitable AI found to load.{}This AI is a dummy AI and won't do anything.{}You can download several AIs via the 'Online Content' system.
 ########
 
 ############ town controlled noise level