WIP single-file and pure Lua bindings for Flecs using the LuaJIT FFI. The aim is to implement at least all the basic Flecs' features that allows making a game. Unsafer operations are not implemented yet. Based on https://github.com/flecs-hub/flecs-lua/
Standard CMake build. You need to copy or make a symbolic link to ecs.lua and tests.lua alongside the built binary. Download, compile and install LuaJIT following the directions in the official webpage, or just install it from your distro's package repositories, but I don't peronally use those.
For Windows, after compiling LuaJIT, copy or symlink lua51.lib found at luajit/src after the build to a new directory under this project's root libs/luajit. Copy lua.h, luaconf.h, lualib.h and lauxlib.h to a new directory libs/lua/luajit-2.1. Blame Windows for not having a standard way to install development libraries.
At the Lua side, you only need ecs.lua, the standard Lua libraries and the standard FFI, BitOp and string buffer LuaJIT libraries. At the C side, your app needs to export Flecs' symbols, which Linux does by default. For Windows, you need to comment out the second line #define flecs_STATIC in flecs.h and define flecs_EXPORTS, probably unless you use Flecs as a DLL but I haven't tested this. Also, it's important to define FLECS_SOFT_ASSERT to make Flecs do some checks and allow it to recover from recoverable errors, specially if you run third-party code!
Before require'ing the library, you can set the globals ecs_ftime_t and ecs_float_t to any string representing a C type matching any custom #defines you might have provided to Flecs; for example, #define ecs_ftime_t double. They must match in Lua and in C! They are both float by default, just like Flecs' defaults.
This library uses ffi.C.free() to release the memory allocated and returned by Flecs, so don't pass custom memory management functions to Flecs (for example, by using ecs_os_set_api())! This unsafe operation is not yet implemented.