CHANGELOG.md

[0.17]

• API incompatible change: depend on bstr crate and implement ToLua / FromLua for BString and BStr types (thanks @azdle!)
• Add methods (Lua::[unsafe]_load_from_stdlib load from the Lua stdlib on an existing instance (thanks @azdle!)
• Actually print the cause error in Error::CallbackError (thanks @LPGhatguy!)
• API incompatible change: Add MetaMethod::Pairs for the metamethod used by the bult-in pairs function (thanks @steven-aerts!)

[0.16.3]

• Add a Context::current_thread method to get a reference to the Thread backing a given Context.
• Portability fix: Remove a needless cast, fixing builds targetting armv7.
• Small documentation improvements, additional tests

[0.16.2]

• Documentation fixes
• Performance improvement to scoped and non-scoped UserDataMethods. Still could be much better, further improvements coming eventually.
• API incompatible change (soundness fix): Remove unintentional ability to load bytecode via Context::load. Now only loads text source, bytecode can cause UB in the Lua VM.

[0.16.1]

• Documentation fixes

[0.16]

• Small fixes for the way new Lua states are created, preventing some potential unhandled errors
• Propery mark all internal panics as internal and indicative of a bug
• HUGE API incompatible change: move most of the Lua API into Context and require context callbacks to generate a branding lifetime, and use this branding lifetime on handle types. Fixes a hard to trigger soundness issue, and removes the only remaining API panic (that is not a bug). See the documentation for the Lua type for more details.
• Fix error_traceback to work in all cases (thanks @yasumutte!)
• Use compiletest_rs on stable
• API incompatible change: Change to use 2018 edition, rlua now requires rustc 1.31 to use.
• Implement ToLua for CStr and CString, implement FromLua for CString (thanks @althonos!)
• Add ability to control what std libraries are loaded in a Lua state on startup (huge thanks to @Shiroy!)
• Add ability to set the Lua "hook function", which allows for limiting the execution of running scripts (huge thanks to @lemarcuspoilus!)
• API incompatible change: remove failure as a dependency, Error no longer implements failure::Fail.
• API incompatible change: change the API for loading Lua chunks to allow for changing _ENV. Context::load now returns a builder on which you can set the chunk name and _ENV.
• API incompatible change: remove str assumptions from the remaining places: the UserData trait and named registry keys
• (Painstakingly!) remove the need for the gc_guard garbage collector hack, and thus also the "abort on OOM" hack.
• Add an API for memory limits, now possible because of removal of gc_guard.
• Add an API for controlling the garbage collector, also now possible due to the removal of gc_guard.
• Remove the last internal aborts from rlua, possible to make safe due to the removal of gc_guard.

[0.15.3]

• Fix improper num-traits dependency, proper [ui]128 support only added later in 0.2 series (thanks @sakridge for catching this!)

[0.15.2]

• API Incompatible change: Allow Lua::load Lua::exec and Lua::eval to take &String &str and &[u8] like Lua::create_string does. I think this might be technically allowed in a minor revision, but due to how rlua is used it's definitely more like an API incompatible change. This is a last minute same-day change to 0.15 though, so there's no sense in adding another version bump.

[0.15.1]

• Docs and changelog fixes

[0.15.0]

• Implement MultiValue conversion up to 16
• Small fix to prevent leaking on errors in metatable creation
• API incompatible change: New API for non-'static UserData! Scoped UserData is now split into create_static_userdata and create_nonstatic_userdata because there are certain limitations on create_nonstatic_userdata that mean that nonstatic is not always what you want.
• API incompatible change: In order to support the new non-'static scoped UserData, the API for UserData methods has changed, and UserDataMethods is now a trait rather than a concrete type.
• Added pkg-config feature that can be used if builtin-lua is disabled to use pkg-config to find lua5.3 externally (thanks @acrisci!).
• API incompatible change: Add conversions for i128 and u128 and change the behavior of numeric conversions to not implicitly as cast. Numeric conversions now use num_traits::cast internally and error when the cast function fails. This errors on out of range but not loss of precision, so casting 1.1f64 to i32 will succeed, but casting (1i64 << 32) to i32 will not. When casting to lua, integers that are out of range of the lua_Integer type are instead converted to lua_Number.
• Allow arbitrary &[u8]-like data in Lua::create_string. This uses AsRef<[u8]> so you can use &str and &String, but you can also now use &[u8], which enables you to create non-utf8 Lua strings.

[0.14.2]

• Another soundness fix for Lua::scope that is related to the last soundness fix, forbidding capturing 'lua arguments inside callbacks. This, like the previous fix, is a breaking change, but anything that it breaks was probably unsound.

[0.14.1]

• Update to require failure 0.1.2 and fix deprecation warnings.
• Update embedded Lua to 5.3.5
• Important soundness fix for Lua::scope, no longer allow callbacks created from Scope to leak their parameters.

[0.14.0]

• Lots of performance improvements, including one major change: Lua handles no longer use the registry, they now instead are stored in an auxiliary thread stack created solely for the purpose of holding ref values. This may seem extremely weird, but it is vastly faster than using the registry or raw tables for this purpose. The first attempt here was to use the same stack and to do a lot of complex bookkeeping to manage the references, and this DOES work, but it comes with a lot of complexity and downsides along with it. The second approach of using an auxiliary thread turned out to be equally fast and with no real downsides over the previous approach. With all the performance improvements together, you can expect (VERY rough estimate) somewhere on the order of 30%-60% CPU time reduction in the cost of bindings, depending on usage patterns.
• Addition of some simple criterion.rs based benchmarking. This is the first rlua release to focus on performance, but performance will hopefully remain a focus going forward.
• API incompatible change: Lua is no longer RefUnwindSafe and associated handle values are no longer UnwindSafe or RefUnwindSafe. They should not have been marked as such before, because they are extremely internally mutable, so this can be considered a bugfix. All rlua types should actually be perfectly panic safe as far as internal invariants are concerned, but (afaict) they should not be marked as RefUnwindSafe due to internal mutability and thus potentially breaking user invariants.
• Upgrade to require cc 1.0.
• Several Lua stack checking bugs have been fixed that could have lead to unsafety in release mode.

[0.13.0]

• Small API incompatible change which fixes unsafety: Scope and scope created handle lifetimes have been changed to disallow them from escaping the scope callback. Otherwise, this could lead to dangling registry handles, which can be used to cause UB. This is the only API change for 0.13.
• Small fixes for potential panics / longjmps around the embedded traceback function.
• Temporary fix for #71 that works on stable rust without dirty tricks, while waiting for the larger fix for rust #48251 to make its way to stable.

[0.12.2]

• Some minor documentation fixes.
• Fix for some rare panics which might result in an abort from panicking across a C API boundary.

[0.12.1]

• Fix a stupid bug where AnyUserData::set_user_value / AnyUserData::get_user_value could panic if the ToLua / FromLua type conversion failed.
• Add UserDataMethods::add_function_mut and UserDataMethods::add_meta_function_mut for symmetry.
• Add some more documentation for changes in 0.12, and fix some minor problems.

[0.12.0]

• Changed how userdata values are garbage collected, both to fix potential panics and to simplify it. Now, when userdata is garbage collected, it will be given a special "destructed userdata" metatable, and all interactions with it will error with CallbackDestructed. From the rust side, an expired userdata AnyUserData will not appear to be any rust type.
• Changed the RegistryKey API to be more useful and general. Now, it is not 100% necessary to manually remove RegistryKeys in order to clean up the registry, instead you can periodically call Lua::expire_registry_values to remove registry values with RegistryKeys that have all been dropped. Also, it is no longer a panic to use a RegistryKey from a mismatched Lua instance, it is simply an error.
• Lua is now Send, and all userdata / callback functions have a Send requirement. This is a potentially annoying breaking change, but there is a new way to pass !Send types to Lua in a limited way.
• HUGE change, there is now a Lua::scope method, which allows passing non-'static functions to Lua in a controlled way. It also allows passing !Send functions and !Send userdata to Lua, with the same limitations. In order to make this safe, the scope method behaves similarly to the crossbeam crate's crossbeam::scope method, which ensures that types created within the scope are destructed at the end of the scope. When using callbacks / userdata created within the scope, the callbacks / userdata are guaranteed to be destructed at the end of the scope, and inside Lua references to them are in an invalidated "destructed" state. This destructed state was already possible to observe through __gc methods, so it doesn't introduce anything new, but it has been fixed so that it cannot cause panics, and has a specific error type.
• Correctly error on passing too many arguments to an rlua::Function, and correctly error when returning too many results from a callback. Previously, this was a panic.
• Lua::create_function is now split into Lua::create_function and Lua::create_function_mut, where the first takes a Fn and the second takes a FnMut. This allows for recursion into rust functions if the function is not FnMut. There is a similar change for UserDataMethods, where the mut variants of the functions now take FnMut, and the non-mut variants take Fn. There is not a way to make a non-mut UserDataMethods method with a FnMut function.

[0.11.0]

• rlua::Error now implements failure::Fail and not std::error::Error, and external errors now require failure::Fail. This is the only API incompatible change for 0.11, and my hope is that it is relatively minor. There are no additional bounds on external errors, since there is a blanket impl for T: std::error::Error + Send + Sync of failure::Fail, but rlua::Error no longer implements std::error::Error and there is an additional dependency, and that is more likely to cause breakage.
• protect a call to luaL_ref when creating new userdata types.
• Some documentation improvements for Error, Lua::create_function, and MetaMethod, and a rustdoc warning fix (thanks @jonas-schievink!)
• Expose the RegistryKey type in the API properly, which makes the API around it vastly easier to use! Also fixes a safety hole around using the RegistryKey API with the wrong Lua instance.
• Add an API for "user values", which are arbitrary Lua values that can be attached to userdata.

[0.10.2]

• Registry API for storing values inside the Lua instance, either by string or by automatically generated keys.
• Important memory safety fix for luaL_ref.

[0.10.1]

• Documentation spelling fix

[0.10.0]

• Handle all 'm' functions in the Lua C API correctly, remove LUA_ERRGCMM hacks.
• Lots and lots of internal changes to support handling all 'm' errors
• Change the API in a lot of places due to functions that can trigger the gc now potentially causing Error::GarbageCollectorError errors.

[0.9.7]

• Add unsafe function to load the debug Lua module (thanks @Timidger!)
• Fix setmetatable wrapper with nil metatable (thanks again to @Timidger!)

[0.9.6]

• Fix an annoying bug that made external errors appear to have no further cause errors in the cause chain.

[0.9.5]

• Fix incorrect xpcall behavior
• Change FromLua / ToLua impls for HashMap to be generic over the hasher. This may be technically a backwards incompatible change, but this would be really unusual though, and I don't think it deserves an API bump.

[0.9.4]

• Fix quadratic behavior in Function::bind
• lua_checkstack fixes, particularly fixing a crash bug due to luaL_ref using a single extra stack space.

[0.9.3]

• Soundness fix for recursive function calls, now causes a panic. This is temporary while I work on a more major update that prevents panics / aborts from scripts.

[0.9.2]

• Bugfix, don't load the "base" library into the "base" global variable @jonas-schievink
• Additional documentation work, a link fix for Variadic docs, new crate documentation @jonas-schievink
• Metatable access on Table
• gcc crate warning fix for 0.3.52 and up
• Bugfix for Table::raw_get, now actually calls raw_get and is sound.

[0.9.1]

• Add travis badge

[0.9.0]

• Huge API change, removed the Lua prefix on all types, changes to callback signature that remove the need for manual wrapping and unwrapping in most cases.
• Tons of soundness bugfixes, very few soundness problems remain.
• Tons of documentation and bugifx work @jonas-schievink

[0.8.0]

• Major API change, out of stack space is no longer an Err, you should not be able to run out of stack space by using this API, except through bugs.
• Simplification of error types

[0.7.0]

• API change to remove dependency on error_chain, major changes to error handling strategy to allow Lua to catch and rethrow rust errors sanely.