request: filter for supported platforms from pubspec

[benthillerkus]

Is there an existing feature request for this?

• I have searched the existing issues.

Command

melos exec --supports-platform=""

Description

As a developer, I want to run melos scripts only on a subset of packages, maybe because I'm on a certain platform, or only want to test for a certain platform.

The way to support that would be through Melos filtering ability.

The --supports-platform filter would filter for packages that support the current platform melos is being invoked on.
Additionally you can specify the platforms you require via a list like so: --supports-platform="macos, linux".

Which platform a package supports would be based on the platforms: field in pubspec.yaml. If the field is not set, it is assumed that the package supports all platforms.

Reasoning

In CI I want to run all tests on Linux, besides ones on packages that don't support Linux (or in my case specifically only support macos)

Additional context and comments

No response

[Salakar]

Flutter packages have a named platform folder convention already so you can already do this via --dir-exists, e.g.

melos list --dir-exists="macos" --dir-exists="linux"

This is what we do on the FlutterFire repository to filter platforms.