Announcement: https://elixir-lang.org/blog/2021/12/03/elixir-v1-13-0-released/

1. Enhancements

EEx

• [EEx] Add :parser_options to EEx functions

Elixir

• [Calendar] Add c:Calendar.year_of_era/3 to support calendars where the beginning of a new era does not align with the beginning of a new year
• [CLI] Support --short-version on the CLI that does not boot the VM
• [Code] Add Code.string_to_quoted_with_comments/2 and Code.quoted_to_algebra/2
• [Code] Add more :token_metadata to aliases and remote calls when parsing strings
• [Code] Add Code.Fragment module to provide best-effort information from code fragments. The module currently provides an updated Code.Fragment.cursor_context/2 with operator support and Code.Fragment.surround_context/2 which looks at a given position in a fragment and find its surrounding delimiters
• [Code] Allow custom sigil formatting on Code.format_string!/2
• [Code] Add {:on_module, bytecode, :none} trace to compilation tracers
• [Enum] Optimize Enum.concat/1 for lists of lists
• [Enum] Add Enum.slide/3
• [Exception] Better format Elixir exceptions in Erlang
• [Inspect] Allow default inspect fun to be set globally with Inspect.Opts.default_inspect_fun/1
• [IO] Allow :eof to be given as limit to IO.getn/2
• [Kernel] Support the :sigils option in import Mod, only: :sigils and allow the sigil modifiers to be also digits
• [Kernel] Make get_in consistently abort when nil values are found
• [Kernel] Improve compilation times by reducing the amount of copies of the AST across compiler processes
• [Kernel] Raise if trying to define a module with a slash in its name
• [Kernel] Warn when ?\ is used and there is no need for a escape character
• [Kernel] Track structs in typespecs as export deps instead of compile-time deps
• [Kernel] Add power operator (**/2)
• [Keyword] Add Keyword.validate/2
• [Keyword] Implement Keyword.filter/2 and Keyword.map/2
• [List] Add List.keyfind!/3
• [Macro] Add Macro.prewalker/1 and Macro.postwalker/1
• [Macro.Env] Add the following reflection functions: required?/2, lookup_import/2, fetch_alias/2, and fetch_macro_alias/2
• [Map] Implement Map.filter/2 and Map.map/2
• [Module] Support :nillify_clauses in Module.get_definition/3
• [Module] Add Module.attributes_in/1 and Module.overridables_in/1
• [OptionParser] Add "did you mean?" suggestions to OptionParser.ParseError messages
• [Record] Add record reflection via @__records__
• [Task] Add Task.completed/1
• [Task] Add Task.ignore/1 to keep a task running but ignoring all of its results
• [Task] Reduce the amount of copying Task.async* functions
• [URI] Add URI.new/1 and URI.new!/1

ExUnit

• [ExUnit] Show hint if comparing different but equivalent strings
• [ExUnit.CaptureIO] Add with_io/3 to return result with captured io
• [ExUnit.CaptureLog] Add with_log/2 to return result with captured logs

IEx

• [IEx.Autocomplete] Add path autocompletion whenever when the cursor follows "./ or "/ or "DRIVER: where DRIVER is a single letter
• [IEx.Autocomplete] Add autocompletion for sigils, struct names, and struct fields
• [IEx.Helpers] Allow multiple modules to be given to r/1

Logger

• [Logger] Add Logger.put_application_level/2

Mix

• [Mix] Add MIX_INSTALL_FORCE environment variable support
• [Mix] Support :config and :system_env in Mix.install/2
• [Mix] Add Mix.installed?/0
• [Mix.Shell] Add :default option to Mix.Shell.yes?
• [mix archive.install] Run loadconfig before building archive
• [mix compile] Move Elixir version check to before deps are compiled, in order to give feedback earlier
• [mix compile.elixir] Do not recompile files if their modification time change but their contents are still the same and the .beam files are still on disk
• [mix compile.elixir] Do not recompile all Elixir sources when Erlang modules change, only dependent ones
• [mix compile.elixir] Do not recompile Elixir files if mix.exs changes, instead recompile only files using Mix.Project or trigger a recompilation if a compiler option changes
• [mix compile.elixir] Only recompile needed files when a dependency is added, updated or removed
• [mix compile.elixir] Only recompile needed files when a dependency is configured
• [mix deps] Add :subdir option to git deps
• [mix escript.install] Run loadconfig before building escript
• [mix format] Support :plugins in mix format that can hook into custom extensions and sigils
• [mix format] Add Mix.Tasks.Format.formatter_for_file/2
• [mix local.rebar] No longer support sub_dirs in Rebar 2 to help migration towards Rebar 3
• [mix local.rebar] Support --if-missing option when installing Rebar
• [mix local.rebar] Set REBAR_PROFILE=prod when compiling Rebar dependencies
• [mix test] Support --profile-require=time to profile the time loading test files themselves
• [mix test] Allow filtering modules from coverage using regex
• [mix test] Allow the exit status of ExUnit to be configured and set the default to 2
• [mix test] Exit with a status of 3 when coverage falls below threshold
• [mix test] Write failed manifest when suite fails due to --warnings-as-errors
• [mix test] Ignore MIX_TEST_PARTITION when partitions set to 1
• [mix xref] Support multiple sinks and sources in mix xref graph
• [mix xref] Add trace subcommand to print compilation dependencies between files
• [mix xref] Add --fail-above option to mix xref
• [mix xref] Add --label compile-connected to mix xref

2. Bug fixes

EEx

• [EEx] Accept comments in EEx between do and the first clause
• [EEx] Accept EEx expressions where -> is followed by newline

Elixir

• [Application] Allow any expression as first argument of compile_env
• [Application] Warn if Application.compile_env or Application.compile_env! are called without a require
• [Code] Make sure :static_atoms_encoder in Code.string_to_quoted/2 also applies to quoted keyword keys
• [Code] Ensure bindings with no context are returned as atoms instead of {binding, nil} in eval operations
• [Inspect] Fix a bug when inspecting a non-binary bitstring with colors
• [Kernel] Reject bidirectional formatting characters in strings and comments
• [Kernel] Support escaping of terminators in uppercase sigils heredocs for consistency
• [Kernel] Raise if __CALLER__ or __ENV__ or __STACKTRACE__ are used in match
• [Kernel] Improve error message on invalid argument for byte_size from binary concat
• [Kernel] Raise when aliasing non-Elixir modules without :as
• [Kernel] Allow unquote_splicing inside %{...} without parens
• [Kernel] Ensure that waiting on a struct expansion inside a typespec is correctly tracked as waiting time in the compiler
• [Kernel] Correctly parse the atom . as a keyword list key
• [Kernel] Do not leak variables from the first generator in with and for special forms
• [Kernel] Fix column number on strings with NFD characters
• [Kernel] Fix a bug where a combination of dynamic line in quote with unquote of remote calls would emit invalid AST metadata
• [OptionParser] Validate switch types/modifiers early on to give more precise feedback
• [Protocol] Add defdelegate to the list of unallowed macros inside protocols as protocols do not allow function definitions
• [Protocol] Warn if @callback, @macrocallback and @optional_callbacks are defined inside protocol
• [Protocol] Ensure protocol metadata is deterministic on consolidation
• [Range] Always show step when range is descending
• [String] Update Unicode database to version 14.0
• [URI] Only percent decode if followed by hex digits (according to https://url.spec.whatwg.org/#percent-decode)
• [Version] Ensure proper precedence of and/or in version requirements

ExUnit

• [ExUnit] Fix formatter and counters from ExUnit.run/0 to consider all tests in a module whenever if a module's setup_all fails
• [ExUnit] Allow doctests newlines to be terminated by CRLF

IEx

• [IEx] Fix the loss of .iex.exs context after a pry session
• [IEx] Stop evaluator before exiting IEx server to avoid evaluators leaking

Logger

• [Logger] Raise clear error message for invalid :compile_time_purge_matching configuration
• [Logger] Fix a bug where Logger would not reset its discard counter under some scenarios

Mix

• [mix compile.elixir] Track transitive runtime dependencies coming from local/path dependencies
• [mix compile.elixir] Recompile file if @external_resource is deleted
• [mix compile.elixir] Print number of compiling files on all compiler cycles. This will make the Compiling N files (.ex) show up multiple times if necessary
• [mix deps] Raise if local dep is unavailable while compiling
• [mix deps.unlock] Fix blank output when unlocking a dependency that is not locked
• [mix local.install] Do not respect MIX_DEPS_PATH for install commands
• [mix release] Improve release scripts by making sure shell errors cascade (this is done by avoiding exporting and defining variables in a single step)
• [mix release] Do not boot release if RELEASE_COOKIE is empty
• [mix release] Allow releases running as a daemon to be restarted
• [mix release] Raise proper error message when non-serializable values are in configs
• [mix test] Fix coverage engine to also tag case, cond, and receive branches where the right side is a literal

3. Soft-deprecations (no warnings emitted)

Elixir

• [Code] Environment options in Code.eval_quoted/3 and Code.eval_string/3, such as :aliases and :tracers, have been deprecated in favor of passing an environment
• [IO] :all on IO.getn is deprecated in favor of :eof
• [URI] URI.parse/1 is deprecated in favor of URI.new/1 and URI.new!/1

Mix

• [mix format] Mix.Tasks.Format.formatter_opts_for_file/2 is deprecated in favor of Mix.Tasks.Format.formatter_for_file/2

4. Hard-deprecations

Elixir

• [Code] Code.cursor_context/2 is deprecated, use Code.Fragment.cursor_context/2 instead
• [Macro] Macro.to_string/2 is deprecated, use Macro.to_string/1 instead
• [System] System.get_pid/0 is deprecated, use System.pid/0 instead
• [Version] Using ! or != in version requirements is deprecated, use ~> or >= instead

Mix

• [mix escript.build] :strip_beam option is deprecated in favor of :strip_beams
• [Mix] :exit_code in Mix.raise/2 has been deprecated in favor of :exit_status
• [Mix.Config] Mix.Config is deprecated in favor of Config module

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