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Releases: dart-lang/dart_style

package:dart_style v3.0.1

20 Dec 21:35
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  • Handle trailing commas in for-loop updaters (#1354).
  • Format || patterns like fallthrough cases in switch expressions (#1602).
  • Handle comments and metadata before variables more gracefully (#1604).
  • Ensure comment formatting is idempotent (#1606).
  • Better indentation of leading comments on property accesses in binary operator
    operands (#1611).
  • Don't crash on doc comments in local variable declarations (#1621).

package:dart_style v3.0.0

03 Dec 00:40
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This is a large change. Under the hood, the formatter was almost completely
rewritten, with the codebase now containing both the old and new
implementations. The old formatter exists to support the older "short" style
and the new code implements the new "tall" style.

The formatter uses the language version of the formatted code to determine
which style you get. If the language version is 3.6 or lower, the code is
formatted with the old style. If 3.7 or later, you get the new tall style. You
typically control the language version by setting a min SDK constraint in your
package's pubspec
.

In addition to the new formatting style, a number of other API and CLI changes
are included, some of them breaking:

  • Support project-wide page width configuration. By long request, you can
    now configure your preferred formatting page width on a project-wide basis.
    When formatting files, the formatter will look in the file's directory and
    any surrounding directories for an analysis_options.yaml file. If it finds
    one, it looks for the following YAML:

    formatter:
      page_width: 123

    If it finds a formatter key containing a map with a page_width key whose
    value is an integer, then that is the page width that the file is formatted
    using. Since the formatter will walk the surrounding directories until it
    finds an analysis_options.yaml file, this can be used to globally set the
    page width for an entire directory, package, or even collection of packages.

  • Support overriding the page width for a single file. In code formatted
    using the new tall style, you can use a special marker comment to control the
    page width that it's formatted using:

    // dart format width=30
    main() {
      someExpression +
          thatSplitsAt30;
    }

    This comment must appear before any code in the file and must match that
    format exactly. The width set by the comment overrides the width set by any
    surrounding analysis_options.yaml file.

    This feature is mainly for code generators that generate and immediately
    format code but don't know about any surrounding analysis_options.yaml
    that might be configuring the page width. By inserting this comment in the
    generated code before formatting, it ensures that the code generator's
    behavior matches the behavior of dart format.

    End users should mostly use analysis_options.yaml for configuring their
    preferred page width (or do nothing and use the default page width of 80).

  • Support opting out a region of code from formatting. In code formatted
    using the new tall style, you can use a pair of special marker comments to
    opt a region of code out of automated formatting:

    main() {
      this.isFormatted();
      // dart format off
      no   +   formatting
        +
          here;
      // dart format on
      formatting.isBackOnHere();
    }

    The comments must be exactly // dart format off and // dart format on.
    A file may have multiple regions, but they can't overlap or nest.

    This can be useful for highly structured data where custom layout can help
    a reader understand the data, like large lists of numbers.

  • Remove support for fixes and --fix. The tools that come with the Dart
    SDK provide two ways to apply automated changes to code: dart format --fix
    and dart fix. The former is older and used to be faster. But it can only
    apply a few fixes and hasn't been maintained in many years. The dart fix
    command is actively maintained, can apply all of the fixes that
    dart format --fix could apply and many many more.

    In order to avoid duplicate engineering effort, we decided to consolidate on
    dart fix as the one way to make automated changes that go beyond the simple
    formatting and style changes that dart format applies.

    The ability to apply fixes is also removed from the DartFormatter() library
    API.

  • Make the language version parameter to DartFormatter() mandatory. This
    way, the formatter always knows what language version the input is intended
    to be treated as. Note that a // @dart= language version comment, if
    present, overrides the specified language version. You can think of the
    version passed to the DartFormatter() constructor as a "default" language
    version which the file's contents may then override.

    If you don't particularly care about the version of what you're formatting,
    you can pass in DartFormatter.latestLanguageVersion to unconditionally get
    the latest language version that the formatter supports. Note that doing so
    means you will also implicitly opt into the new tall style.

    This change only affects the library API. When using the formatter from the
    command line, you can use --language-version= to specify a language version
    or pass --language-version=latest to use the latest supported version. If
    omitted, the formatter will look in the surrounding directories for a package
    config file and infer the language version for the package from that, similar
    to how other Dart tools behave like dart analyze and dart run.

  • Remove the old formatter executables and CLI options. Before the
    dart format command was added to the core Dart SDK, users accessed the
    formatter by running a separate dartfmt executable that was included with
    the Dart SDK. That executable had a different CLI interface. For example, you
    had to pass -w to get it to overwrite files. When we added dart format,
    we took that opportunity to revamp the CLI options.

    However, the dart_style package still exposed an executable with the old CLI.
    If you ran dart pub global activate dart_style, this would give you a
    dartfmt (and dartformat) executable with the old CLI options. Now that
    almost everyone is using dart format, we have removed the old CLI and the
    old package executables.

    You can still run the formatter on the CLI through the package (for example,
    if you want to use a particular version of dart_style instead of the one
    bundled with your Dart SDK). But it now uses the exact same CLI options and
    arguments as the dart format command. You can invoke it with
    dart run dart_style:format <args...>.

  • Treat the --stdin-name name as a path when inferring language version.
    When reading input on stdin, the formatter still needs to know what language
    version to parse the code as. If the --stdin-name option is set, then that
    is treated as a file path and the formatter looks for a package config
    surrounding that file path to infer the language version from.

    If you don't want that behavior, pass in an explicit language version using
    --language-version=, or use --language-version=latest to parse the input
    using the latest language version supported by the formatter.

    If --stdin-name and --language-version are both omitted, then the
    formatter parses stdin using the latest supported language version.

  • Rename the --line-length option to --page-width. This is consistent
    with the public API, internal implementation, and docs, which all use "page
    width" to refer to the limit that the formatter tries to fit code into.

    The --line-length name is still supported for backwards compatibility, but
    may be removed at some point in the future. You're encouraged to move to
    --page-width. Use of this option (however it's named) is rare, and will
    likely be even rarer now that project-wide configuration is supported, so
    this shouldn't affect many users.

  • Apply class modifiers to API classes. The dart_style package exposes only
    a few classes in its public API: DartFormatter, SourceCode,
    FormatterException, and UnexpectedOutputException. None were ever
    intended to be extended or implemented. They are now all marked final to
    make that intention explicit.

  • Require package:analyzer >=6.5.0 <8.0.0.

package:dart_style v2.3.7

10 Sep 00:50
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  • Allow passing a language version to DartFomatter(). Formatted code will be
    parsed at that version. If omitted, defaults to the latest version. In a
    future release, this parameter will become required.
  • Allow opting out of formatting for a region of code using // dart format off
    and // dart format on comments. Note: This only works using the new tall
    style and requires passing the --enable-experiment=tall-style experiment
    flag (#361).
  • Preserve type parameters on old-style function-typed formals that also use
    this. or super. (#1321).
  • Correctly format imports with both as and if clauses (#1544).
  • Remove temporary work around for analyzer 6.2.0 from dart_style 2.3.6.
  • Require package:analyzer >=6.5.0 <7.0.0.

package:dart_style v2.3.6

29 Feb 19:00
c644037
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  • Fix compile error when using dart_style with analyzer 6.2.0.

package:dart_style v2.3.5

29 Feb 00:51
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  • Ensure switch expressions containing line comments split (#1404).
  • Use language version 3.3 to parse so that code with extension types can be
    formatted.
  • Support formatting the macro modifier when the macros experiment flag
    is passed.

package:dart_style v2.3.4

21 Nov 19:25
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  • Add tall-style experiment flag to enable the in-progress unstable new
    formatting style (#1253).
  • Format extension types.
  • Normalize ignored whitespace and "escaped whitespace" on first line
    of multiline string literals. (#1235)

package:dart_style v2.3.2

29 Jun 16:27
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  • Don't indent parameters that have metadata annotations. Instead, align them
    with the metadata and other parameters.
  • Allow metadata annotations on parameters to split independently of annotations
    on other parameters (#1212).
  • Don't split before . following a record literal (#1213).
  • Don't force split on a line comment before a switch expression case (#1215).
  • Require package:analyzer >=5.12.0 <7.0.0.
  • Preserve ? on nullable empty record types (#1224).