From 0800649d8f4048b910fbde78608867b5c96c41b2 Mon Sep 17 00:00:00 2001
From: Mr_Goldberg <gold@berg>
Date: Sat, 13 Aug 2022 14:40:55 -0400
Subject: [PATCH] Add supported_languages.txt to specify which languages are
 available in a game.

---
 Readme_release.txt                            |  4 ++
 dll/settings.h                                |  3 ++
 dll/settings_parser.cpp                       | 37 +++++++++++++++++++
 .../supported_languages.EXAMPLE.txt           |  8 ++++
 4 files changed, 52 insertions(+)
 create mode 100644 files_example/steam_settings.EXAMPLE/supported_languages.EXAMPLE.txt

diff --git a/Readme_release.txt b/Readme_release.txt
index 105f005e..2a02c1c1 100644
--- a/Readme_release.txt
+++ b/Readme_release.txt
@@ -44,6 +44,10 @@ If the DLC file is present, the emulator will only unlock the DLCs in that file.
 The contents of this file are: appid=DLC name
 See the steam_settings.EXAMPLE folder for an example.
 
+Languages:
+You can include a steam_settings\supported_languages.txt file with a list of languages that the game supports. If the global emu language setting is not in this list of languages the emu will default to the first language in the list.
+See the steam_settings.EXAMPLE folder for an example.
+
 Depots:
 This is pretty rare but some games might use depot ids to see if dlcs are installed. You can provide a list of installed depots to the game with a steam_settings\depots.txt file.
 See the steam_settings.EXAMPLE folder for an example.
diff --git a/dll/settings.h b/dll/settings.h
index 28fc3f07..a7b2aa92 100644
--- a/dll/settings.h
+++ b/dll/settings.h
@@ -156,6 +156,9 @@ public:
     //app build id
     int build_id = 10;
 
+    //supported languages
+    std::set<std::string> supported_languages;
+
     //make lobby creation fail in the matchmaking interface
     bool disable_lobby_creation = false;
 
diff --git a/dll/settings_parser.cpp b/dll/settings_parser.cpp
index 3aa8dedb..22dad2ed 100644
--- a/dll/settings_parser.cpp
+++ b/dll/settings_parser.cpp
@@ -260,6 +260,41 @@ uint32 create_localstorage_settings(Settings **settings_client_out, Settings **s
         local_storage->store_data_settings("user_steam_id.txt", temp_text, strlen(temp_text));
     }
 
+    std::set<std::string> supported_languages;
+
+    {
+        std::string lang_config_path = Local_Storage::get_game_settings_path() + "supported_languages.txt";
+        std::ifstream input( utf8_decode(lang_config_path) );
+
+        std::string first_language;
+        if (input.is_open()) {
+            consume_bom(input);
+            for( std::string line; getline( input, line ); ) {
+                if (!line.empty() && line[line.length()-1] == '\n') {
+                    line.pop_back();
+                }
+
+                if (!line.empty() && line[line.length()-1] == '\r') {
+                    line.pop_back();
+                }
+
+                try {
+                    std::string lang = line;
+                    if (!first_language.size()) first_language = lang;
+                    supported_languages.insert(lang);
+                    PRINT_DEBUG("Added supported_language %s\n", lang.c_str());
+                } catch (...) {}
+            }
+        }
+
+        if (!supported_languages.count(language)) {
+            if (first_language.size()) {
+                memset(language, 0, sizeof(language));
+                first_language.copy(language, sizeof(language) - 1);
+            }
+        }
+    }
+
     bool steam_offline_mode = false;
     bool disable_networking = false;
     bool disable_overlay = false;
@@ -336,6 +371,8 @@ uint32 create_localstorage_settings(Settings **settings_client_out, Settings **s
     settings_server->warn_forced = warn_forced;
     settings_client->warn_local_save = local_save;
     settings_server->warn_local_save = local_save;
+    settings_client->supported_languages = supported_languages;
+    settings_server->supported_languages = supported_languages;
 
     {
         std::string dlc_config_path = Local_Storage::get_game_settings_path() + "DLC.txt";
diff --git a/files_example/steam_settings.EXAMPLE/supported_languages.EXAMPLE.txt b/files_example/steam_settings.EXAMPLE/supported_languages.EXAMPLE.txt
new file mode 100644
index 00000000..60c84dd3
--- /dev/null
+++ b/files_example/steam_settings.EXAMPLE/supported_languages.EXAMPLE.txt
@@ -0,0 +1,8 @@
+english
+german
+french
+spanish
+schinese
+russian
+japanese
+latam