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114 lines
3.8 KiB
Markdown
114 lines
3.8 KiB
Markdown
This is the draft release notes for 0.15.0, scheduled to be released on
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2021-01-01.
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# Breaking changes
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- Builtin functions and subnamespaces of `edit:` are now read-only.
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- Introspection for rest arguments has changed:
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- The rest argument is now contained in the `arg-names` field of a
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closure.
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- The `rest-arg` field now contains the index of the rest argument,
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instead of the name.
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- The `-source` command now runs in a temporary namespace and can no longer
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affect the local scope of its caller.
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- Key modifiers are no longer case insensitive. For example, `Alt` is still
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recognized but `alt` is not. This makes key modifier parsing consistent with
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key names. See [#1163](https://b.elv.sh/1163).
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# Deprecated features
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The following deprecated features trigger a warning whenever the code is parsed
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or compiled, even if it is not executed:
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- Using the syntax of temporary assignment (`var=value`) for non-temporary
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assignment is now deprecated. The syntax is still valid for temporary
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assignment. For example, using `foo=bar` as a standalone command is
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deprecated, but using it as part of command, like `foo=bar ls`, is not
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deprecated.
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- The `chr` command is now deprecated. Use `str:from-codepoints` instead.
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- The `ord` command is now deprecated. Use `str:to-codepoints` instead.
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- The `has-prefix` command is now deprecated. Use `str:has-prefix` instead.
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- The `has-suffix` command is now deprecated. Use `str:has-suffix` instead.
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- The `-source` command is now deprecated. Use `eval` instead.
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- The undocumented `esleep` command is now deprecated. Use `sleep` instead.
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- The `eval-symlinks` command is deprecated. Use `path:eval-symlinks` instead.
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- The `path-abs` command is deprecated. Use `path:abs` instead.
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- The `path-base` command is deprecated. Use `path:base` instead.
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- The `path-clean` command is deprecated. Use `path:clean` instead.
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- The `path-dir` command is deprecated. Use `path:dir` instead.
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- The `path-ext` command is deprecated. Use `path:ext` instead.
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- The `-is-dir` command is deprecated. Use `path:is-dir` instead.
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The following deprecated features trigger a warning when the code is evaluated:
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- Using `:` in slice indices is deprecated. Use `..` instead.
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- The mechanism of assigning to `$-exports-` in `rc.elv` to export variables
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to the REPL namespace is deprecated. Use `edit:add-vars` instead.
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# Notable new features
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New features in the language:
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- A new `var` special command can be used to explicitly declare variables, and
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optionally assign them initial values.
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- A new `set` special command can be used to set the values of variables or
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elements.
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- Slice indices can now use `..` for left-closed, right-open ranges, and `..=`
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for closed ranges.
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- Rest variables and rest arguments are no longer restricted to the last
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variable.
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- Variables containing any character can now be assigned and used by quoting
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their name, for example `'name!' = foo; put $'name!'`.
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New features in the standard library:
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- A new `eval` command supports evaluating a dynamic piece of code in a
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restricted namespace.
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- A new `sleep` command.
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- A new `path:` module has been introduced for manipulating and testing
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filesystem paths.
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- A new `deprecate` command.
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New features in the interactive editor:
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- The new commands `edit:add-var` and `edit:add-vars` provide an API for
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manipulating the REPL's namespace from anywhere.
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- SGR escape sequences written from the prompt callback are now supported.
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New features in the main program:
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- When using `-compileonly` to check Elvish sources that contain parse errors,
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Elvish will still try to compile the source code and print out compilation
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errors.
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# Notable bugfixes
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- Using large lists that contain `$nil` no longer crashes Elvish.
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