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License: MIT
Signed-off-by: Dylan Powers <dylan.kyle.powers@gmail.com>

The change to an array of readers comes from e096060b
(refactor(core/commands2/add) split loop, 2014-11-06), where it's used
to setup readers for each path in the argument list.  However, since
6faeee83 (cmds2/add: temp fix for -r. horrible hack, 2014-11-11) the
argument looping moved outside of add() and into Run(), so we can drop
the multiple-reader support from add().

Adding a file can create multiple nodes (e.g. the splitter can chunk
the file into several blocks), but:

1. we were only appending a single node per reader to our returned
   list, and
2. we are only using the final node in that returned list,

so this commit also adjusts add() to return a single node reference
instead on an array of nodes.

We now consider debugerrors harmful: we've run into cases where
debugerror.Wrap() hid valuable error information (err == io.EOF?).
I've removed them from the main code, but left them in some tests.
Go errors are lacking, but unfortunately, this isn't the solution.

It is possible that debugerros.New or debugerrors.Errorf should
remain still (i.e. only remove debugerrors.Wrap) but we don't use
these errors often enough to keep.

This commit adds a new set of sharness tests for pinning, and addresses
bugs that were pointed out by said tests.

test/sharness: added more pinning tests

Pinning is currently broken. See issue #1051. This commit introduces
a few more pinning tests. These are by no means exhaustive, but
definitely surface the present problems going on. I believe these
tests are correct, but not sure. Pushing them as failing so that
pinning is fixed in this PR.

make pinning and merkledag.Get take contexts

improve 'add' commands usage of pinning

FIXUP: fix 'pin lists look good'

ipfs-pin-stat simple script to help check pinning

This is a simple shell script to help check pinning.

We ought to strive towards making adding commands this easy.
The http api is great and powerful, but our setup right now
gets in the way. Perhaps we can clean up that area.

updated t0081-repo-pinning

- fixed a couple bugs with the tests
- made it a bit clearer (still a lot going on)
- the remaining tests are correct and highlight a problem with
  pinning. Namely, that recursive pinning is buggy. At least:
  towards the end of the test, $HASH_DIR4 and $HASH_FILE4 should
  be pinned indirectly, but they're not. And thus get gc-ed out.
  There may be other problems too.

cc @whyrusleeping

fix grep params for context deadline check

fix bugs in pin and pin tests

check for block local before checking recursive pin

- Modified Godeps/Godeps.json by hand
- [TEST] Updated welcome docs hash to sharness
- [TEST] Updated contact doc
- [TEST] disabled breaking test (t0080-repo refs local)

squash! core/commands: Added progress bars for 'add'

Use vendored progress bar lib in 'add'

core/commands: Don't use pointers for Type field

core/commands: Refactored command marshalers

I made the commands lib dir listing sort the contents
so we get the same sequence of files from it repeatably.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

+ style: sort command list

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

Also:
- map[cmds.EncodingType]cmds.Marshaller -> MarshalMap

cc @mappum @maybebtc