Changes since Idris 2 v0.2.0 ---------------------------- Language changes: * `Bits8`, `Bits16`, `Bits32` and `Bits64` primitive types added, with: + `Num`, `Eq`, `Ord` and `Show` implementations. + Casts from `Integer`, for literals + Casts to `Int` (except `Bits64` which might not fit), `Integer` and `String` + Passed to C FFI as `unsigned` + Primitives added in `Data.Buffer` * Elaborator reflection and quoting terms + Requires extension `%language ElabReflection` + API defined in `Language.Reflection`, including functions for getting types of global names, constructors of data types, and adding new top level declarations + Implemented `%macro` function flag, to remove the syntactic noise of invoking elaborator scripts. This means the function must always be fully applied, and is run under `%runElab` * Add `import X as Y` + This imports the module `X`, adding aliases for the definitions in namespace `Y`, so they can be referred to as `Y`. * `do` notation can now be qualified with a namespace + `MyDo.do` opens a `do` block where the `>>=` operator used is `MyDo.(>>=)` Library changes: * `IO` operations in the `prelude` and `base` libraries now use the `HasIO` interface, rather than using `IO` directly. * Experimental `Data.Linear.Array` added to `contrib`, supporting mutable linear arrays with constant time read/write, convertible to immutable arrays with constant time read. + Anything in `Data.Linear` in `contrib`, just like the rest of `contrib`, should be considered experimental with the API able to change at any time! Further experiments in `Data.Linear` are welcome :). * Experimental `Control.Linear.LIO` added to `contrib`, supporting computations which track the multiplicities of their return values, which allows linear resources to be tracked. * Added `Control.Monad.ST`, for update in-place via `STRef` (which is like `IORef`, but can escape from `IO`). Also added `Data.Ref` which provides an interface to both `IORef` and `STRef`. * Added `Control.ANSI` in `contrib`, for usage of ANSI escape codes for text styling and cursor/screen control in terminals. Command-line options changes: * Removed `--ide-mode-socket-with` option. `--ide-mode-socket` now accepts an optional `host:port` argument. * Added options to override source directory, build directory and output directory: `--source-dir`, `--build-dir`, `--output-dir`. + These options are also available as fields in the package description: `sourcedir`, `builddir`, `outputdir`. Compiler changes: * It is now possible to create new backends with minimal overhead. `Idris.Driver` exposes the function `mainWithCodegens` that takes a list of codegens. The feature in documented [here](https://idris2.readthedocs.io/en/latest/backends/custom.html). * New code generators `node` and `js`. REPL changes: * Implemented `:module` command, to load a module during a REPL session. * Implemented `:doc`, which displays documentation for a name. * Implemented `:browse`, which lists the names exported by a namespace. Changes since Idris 2 v0.1.0 ---------------------------- The implementation is now self-hosted. To initialise the build, either use the [bootstrapping version of Idris2](https://github.com/edwinb/Idris2-boot) or build from the generated Scheme, using `make bootstrap`. Language changes: * `total`, `covering` and `partial` flags on functions now have an effect. * `%default ` has been implemented. By default, functions must be at least `covering` + That is, `%default covering` is the default status. * Fields of records can be accessed (and updated) using the dot syntax, such as `r.field1.field2` or `record { field1.field2 = 42 }`. For details, see https://idris2.readthedocs.io/en/latest/reference/records.html * New function flag `%tcinline` which means that the function should be inlined for the purposes of totality checking (but otherwise not inlined). This can be used as a hint for totality checking, to make the checker look inside functions that it otherwise might not. * %transform directive, for declaring transformation rules on runtime expressions. Transformation rules are automatically added for top level implementations of interfaces. * A %spec flag on functions which allows arguments to be marked for partial evaluation, following the rules from "Scrapping Your Inefficient Engine" (ICFP 2010, Brady & Hammond) * To improve error messages, one can use `with NS.name ` or `with [NS.name1, NS.name2, ...] ` to disable disambiguation for the given names in ``. Example: `with MyNS.(>>=) do ...`. Library additions: * Additional file management operations in `base` * New module in `base` for time (`System.Clock`) * New modules in `contrib` for JSON (`Language.JSON.*`); random numbers (`System.Random`) Compiler updates: * Data types with a single constructor, with a single unerased arguments, are translated to just that argument, to save repeated packing and unpacking. (c.f. `newtype` in Haskell) + A data type can opt out of this behaviour by specifying `noNewtype` in its options list. `noNewtype` allows code generators to apply special handling to the generated constructor/deconstructor, for a newtype-like data type, that would otherwise be optimised away. * 0-multiplicity constructor arguments are now properly erased, not just given a placeholder null value. Other improvements: * Various performance improvements in the typechecker: + Noting which metavariables are blocking unification constraints, so that they only get retried if those metavariables make progress. + Evaluating `fromInteger` at compile time. * Extend Idris2's literate mode to support reading Markdown and OrgMode files. For more details see: https://idris2.readthedocs.io/en/latest/reference/literate.html Changes since Idris 1 --------------------- Everything :). For full details, see: https://idris2.readthedocs.io/en/latest/updates/updates.html