This enables plugin sources to be specified in one of three ways:
* as a YamlScalar, like `plugin_name: ^1.2.3`
* with a 'version' key, like `plugin_name:\n version: ^1.2.3`, which
allows diagnostic configurations to be alongside.
* with a 'path' key, like `plugin_name:\n path: foo/bar`, which
allows diagnostic configurations to be alongside.
We introduce a PluginSource with a `toYaml` method to convert the
values back into YAML for the generates pubspec. We update
PluginPackageGenerator to use PluginSource.toYaml.
Change-Id: Ic5f372f0339edd6aa638dd9b568a83f41a023b08
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/393900
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Sam Rawlins
e66a8a4fa3