When we tried to run a global script that didn't exist, we would try to
load an AssetEnvironment, which would try to compute the transformers
for it. Because the script doesn't exist, the computation would
conservatively assume that all transformers had to run in case one of
them generated it.

To find all the scripts, it iterated through the package's dependencies.
Since it's notionally the entrypoint, it tried to include its dev
dependencies, but this broke because dev dependencies aren't installed
for globally-activated packages.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1413713010 .

Instead of relying only on modification times, this does a more complex
compatibility check if the modification times of the pubspec, lockfile,
and .packages file aren't ordered properly. If they are up-to-date, it
updates the modification times accordingly.

This also fixes a case where "pub run" wasn't properly checking that the
dependencies were up-to-date.

Closes #1322

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1307853004 .

We were assuming that all globally-activated packages have a .packages
file, but this isn't true for packages that were activated by earlier
versions of pub.

Closes #1316

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1292003005 .

Previously, several commands automatically ran "pub get" implicitly before doing
their work. We've determined that this behavior is confusing, and for "pub run"
in particular, makes the executables seem much slower than they actually are.

This also allows us to make access to the entrypoint's package graph
synchronous.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1282533003 .

Closes pub#22

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1277773002 .

Fixes #1230.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//1272813003 .

This reverts commit 7fbc1040, which
reverted commit dc626af3.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1272903002 .

This reverts commit dc626af3.

This broke due to dart-lang/sdk#23991.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1272833003 .

Previously this was using the packages/ directory, but that's no longer
reliable since there's now an option to not generate it.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1269393003 .

This is helpful for subprocesses to be able to spawn Dart with
Platform.executableArguments and have that work regardless of the
working directory.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1236973002 .

Somehow I didn't notice that the test I added for this wasn't actually
passing.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1211243009.

When running an executable directly from the filesystem, "pub run" would
sometimes fail to give it the correct package root.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1217923002.

If all packages depended on by an executable don't use transformers,
this will avoid loading barback entirely and instead run the VM against
the Dart files on the filesystem.

This shaves about 600ms off the load time for "pub run test" when running from
source.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1166343002.

When the user presses Control-C on the terminal, it sends SIGINT to
all processes in the process tree. However, this is *not* the case for
other signals or signals sent via other means. As a compromise, "pub
run" now manually forwards all signals other than SIGINT.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1060783002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@44902 260f80e4-7a28-3924-810f-c04153c831b5

This is important for unittest, so it can catch SIGINT and gracefully clean up.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1044033003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@44820 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=22076

Review URL: https://codereview.chromium.org//899373002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@43737 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//868463003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@43057 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//601923004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40660 260f80e4-7a28-3924-810f-c04153c831b5

A package's executables may not use all of that package's transformers. This is
especially true for browser frameworks where there's a clear divide between
client-side and server-side code. This uses pub's existing dependency-sniffing
infrastructure to figure out which transformers can be omitted.

This takes "pub run polymer:new_element --help" from 1.52s to 0.96s.

R=rnystrom@google.com
BUG=20859

Review URL: https://codereview.chromium.org//599993004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40659 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=21018
R=nweiz@google.com

Review URL: https://codereview.chromium.org//583193008

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40569 260f80e4-7a28-3924-810f-c04153c831b5

pub run now defaults to --mode=debug for local executables.

R=rnystrom@google.com
BUG=20898

Review URL: https://codereview.chromium.org//550643003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40384 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//548603002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39938 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//521643005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39933 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=20483

Review URL: https://codereview.chromium.org//475093003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39787 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=20482

Review URL: https://codereview.chromium.org//494943002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39528 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=20482

Review URL: https://codereview.chromium.org//482053002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39424 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=19993
R=nweiz@google.com

Review URL: https://codereview.chromium.org//396773003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38353 260f80e4-7a28-3924-810f-c04153c831b5

I also cleaned up a bunch of unused imports.

BUG=https://code.google.com/p/dart/issues/detail?id=20067
R=nweiz@google.com

Review URL: https://codereview.chromium.org//391363004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38352 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//372123002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38102 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=18538
R=nweiz@google.com

Review URL: https://codereview.chromium.org//354763006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@37963 260f80e4-7a28-3924-810f-c04153c831b5