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elvish/NEXT-RELEASE.md
Qi Xiao 066b48cfd2 Make all builtin functions and subnamespaces read-only. 
This fixes #1211.
2021-01-09 00:41:42 +00:00

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This is the draft release notes for 0.15.0, scheduled to be released on 2021-01-01.

Breaking changes

  • Builtin functions and subnamespaces of edit: are now read-only.

  • Introspection for rest arguments has changed:

    • The rest argument is now contained in the arg-names field of a closure.

    • The rest-arg field now contains the index of the rest argument, instead of the name.

  • The -source command now runs in a temporary namespace and can no longer affect the local scope of its caller.

  • Key modifiers are no longer case insensitive. For example, Alt is still recognized but alt is not. This makes key modifier parsing consistent with key names. See #1163.

Deprecated features

The following deprecated features trigger a warning whenever the code is parsed or compiled, even if it is not executed:

  • The chr command is now deprecated. Use str:from-codepoints instead.

  • The ord command is now deprecated. Use str:to-codepoints instead.

  • The has-prefix command is now deprecated. Use str:has-prefix instead.

  • The has-suffix command is now deprecated. Use str:has-suffix instead.

  • The -source command is now deprecated. Use eval instead.

  • The undocumented esleep command is now deprecated. Use sleep instead.

The following deprecated features trigger a warning when the code is evaluated:

  • Using : in slice indices is deprecated. Use .. instead.

Notable new features

New features in the language:

  • Slice indices can now use .. for left-closed, right-open ranges, and ..= for closed ranges.

  • Rest variables and rest arguments are no longer restricted to the last variable.

New features in the standard library:

  • A new eval command supports evaluating a dynamic piece of code in a restricted namespace.

  • A new sleep command.

New features in the interactive editor:

  • SGR escape sequences written from the prompt callback are now supported.

New features in the main program:

  • When using -compileonly to check Elvish sources that contain parse errors, Elvish will still try to compile the source code and print out compilation errors.

Notable bugfixes

  • Using large lists that contain $nil no longer crashes Elvish.