Fix broken fog machine loading (Elynae).

This now introduces the capacity to check the minor version of a save
file via file.minor_version(th). Unfortunately, the enum in
tag-version.h isn't accessible, so you have to go off the numeric
values.

This may introduce issues on updating the major version. Don't forget to
clear lm_fog.lua too!

May cause other bugs, but none I've noticed so far.

1 files changed, 10 insertions, 0 deletions

diff --git a/crawl-ref/source/l_file.cc b/crawl-ref/source/l_file.cc
index efa5f279b4..e5169c942d 100644
--- a/crawl-ref/source/l_file.cc
+++ b/crawl-ref/source/l_file.cc
@@ -41,6 +41,15 @@ static int file_marshall(lua_State *ls)
     return (0);
 }
 
+static int file_minor_version(lua_State *ls)
+{
+    if (lua_gettop(ls) != 1)
+        luaL_error(ls, "Need reader as one argument");
+    reader &th(*static_cast<reader*>(lua_touserdata(ls, 1)));
+    lua_pushnumber(ls, th.getMinorVersion());
+    return (1);
+}
+
 static int file_unmarshall_boolean(lua_State *ls)
 {
     if (lua_gettop(ls) != 1)
@@ -199,6 +208,7 @@ static const struct luaL_reg file_dlib[] =
     { "writefile", _file_writefile },
     { "datadir_files", _file_datadir_files },
     { "datadir_files_recursive", _file_datadir_files_recursive },
+    { "minor_version", file_minor_version },
     { NULL, NULL }
 };