Previously the help messages for 'dart run' were output by a secondary
VM spawned solely to print the VM's help message. However, this help
message was not consistent with those found for other DartDev commands.
With this change, the 'run' command:
- Uses package:args to create a help message consistent with other
DartDev commands.
- No longer accepts arbitrary options and is instead restricted to a
subset of common flags. Passing a VM flag which is not included in
this subset of commands will result in an argument error if passed
*after* the 'run' command. Other VM flags can be passed immediately
following 'dart' and before the DartDev command.
- No longer outputs the VM verbose options when invoked with '--help
--verbose'. VM verbose options and the original VM help message can
be viewed by running 'dart --help --verbose'. This makes uncommon
VM flags used for development less visible to regular users.
- Now properly forwards the subset of VM options accepted by 'run' to
the VM (e.g., 'dart run --observe --no-pause-isolates-on-exit foo.dart'
would have ignored '--no-pause-isolates-on-exit').
Change-Id: Ie56b767cc21e6af3630c742458a6c3e9f7418250
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155841
Commit-Queue: Ben Konyi <bkonyi@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Ben Konyi
501c807266