Make pub use the SDK's "version" file for its version.

Make pub use the SDK's "version" file for its version.

This includes pub's own version and the implied version of SDK
packages. I also added a little test that verifies that pub can
parse the actual version file generated with the SDK.
BUG=5906, 6173, 7837
Committed: https://code.google.com/p/dart/source/detail?r=17512

[Bob Nystrom, 2013-01-23 23:08:19]

Thank you!

[Emily Fortuna, 2013-01-23 23:15:19]

lgtm, with a suggestion

https://codereview.chromium.org/12036065/diff/1/utils/pub/sdk.dart
File utils/pub/sdk.dart (right):

https://codereview.chromium.org/12036065/diff/1/utils/pub/sdk.dart#newcode14
utils/pub/sdk.dart:14: final _versionPattern = new
RegExp(r'^(\d+)\.(\d+)\.(\d+)\.(\d+)(.*)$');
regex-licious! Want to put a comment above this just explaining in words what a
version pattern is expected to look like for posterity? :-)

[Bob Nystrom, 2013-01-23 23:20:35]

Thanks!

https://codereview.chromium.org/12036065/diff/1/utils/pub/sdk.dart
File utils/pub/sdk.dart (right):

https://codereview.chromium.org/12036065/diff/1/utils/pub/sdk.dart#newcode14
utils/pub/sdk.dart:14: final _versionPattern = new
RegExp(r'^(\d+)\.(\d+)\.(\d+)\.(\d+)(.*)$');
On 2013/01/23 23:15:19, Emily Fortuna wrote:
> regex-licious! Want to put a comment above this just explaining in words what
a
> version pattern is expected to look like for posterity? :-)

Done.