add function that generates lua files

README.md

@@ -184,6 +184,7 @@ It returns the generated lua as string.
 `vp.tl_venus_string(str)` returns the lua generated from the given string  
 It returns the generated lua as string.
 
-## todo
-- perhaps write generated lua files to disk
-- perhaps generate venus from lua
+### generating lua files
+`vp.convert_venus_file(venus_file_in,lua_file_out)` generates a lua file  
+It's arguments can be relative or absolute paths.  
+The venus_file_in will be converted to lua and written to lua_file_out.

init.lua

@@ -461,4 +461,11 @@ function parser.dovenus(file)
   return ff()
 end
 
+function parser.convert_venus_file(venus_file_in,lua_file_out)
+  local s = parser.tl_venus_file(venus_file_in)
+  local f = io.open(lua_file_out,"w")
+  f:write(s)
+  f:close()
+end
+
 return parser

translateTest.lua

@@ -1,9 +1,6 @@
 local vp = dofile("init.lua")
 local o = "testout/test.lua"
 
-local s = vp.tl_venus_file("test.venus")
-local f = io.open(o,"w")
-f:write(s)
-f:close()
+vp.convert_venus_file("test.venus",o)
 
 dofile(o)