Better support for re-running in the middle of a migration.

Better support for re-running in the middle of a migration.

- Track files that only exist in the "_2" directories. That way we can
  show what work still remains to be done even if the unmigrated files
  are gone.

- Friendlier matching of command line arguments. Pass in any substring
  of the test path and if only one test matches, it will be used.

- Make --dry-run not crash.

R=bkonyi@google.com

Committed: https://github.com/dart-lang/sdk/commit/1419935fa62f65781518608fcddccbd14bab0856

[Bob Nystrom, 2017-07-27 18:02:45]

Description was changed from

==========
Split migration script into multiple libraries.
==========

to

==========
Better support for re-running in the middle of a migration.

- Track files that only exist in the "_2" directories. That way we can
  show what work still remains to be done even if the unmigrated files
  are gone.

- Friendlier matching of command line arguments. Pass in any substring
  of the test path and if only one test matches, it will be used.

- Make --dry-run not crash.
==========

[Bob Nystrom, 2017-07-27 18:03:18]

rnystrom@google.com changed reviewers:
+ bkonyi@google.com

[Bob Nystrom, 2017-07-27 18:03:18]

The first patchset just moves stuff into separate files. Then the second one
contains the useful changes.

This doesn't do the status file stuff I mentioned this morning. I'll get onto
that shortly.

[bkonyi, 2017-07-27 19:04:28]

LGTM

[Bob Nystrom, 2017-07-27 19:07:24]

Description was changed from

==========
Better support for re-running in the middle of a migration.

- Track files that only exist in the "_2" directories. That way we can
  show what work still remains to be done even if the unmigrated files
  are gone.

- Friendlier matching of command line arguments. Pass in any substring
  of the test path and if only one test matches, it will be used.

- Make --dry-run not crash.
==========

to

==========
Better support for re-running in the middle of a migration.

- Track files that only exist in the "_2" directories. That way we can
  show what work still remains to be done even if the unmigrated files
  are gone.

- Friendlier matching of command line arguments. Pass in any substring
  of the test path and if only one test matches, it will be used.

- Make --dry-run not crash.

R=bkonyi@google.com

Committed:
https://github.com/dart-lang/sdk/commit/1419935fa62f65781518608fcddccbd14bab0856
==========

[Bob Nystrom, 2017-07-27 19:07:25]

Committed patchset #2 (id:20001) manually as
1419935fa62f65781518608fcddccbd14bab0856 (presubmit successful).