Now last executed CommandPipeline is available in __xonsh__.last

[anki-code]

Motivation

There is no way to access to the CommandPipeline of executed command in uncaptured mode. This causes:

• No chance to get return code in one universal way.
• Barrier to trace and inspection.

Before

$(ls nofile)
# No way to access to the CommandPipeline of executed command.

After

$(ls nofile)
__xonsh__.last.rtn  # In interactive or not interactive.
# 2

# Sugar sir:
last = type('LastCP', (object,), {'__getattr__':lambda self, name: getattr(__xonsh__.last, name) })()

ls nofile
last.rtn
# 2

JFYI #5342

For community

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[gforsyth]

Nice! Having a consistent, programmatic place to grab this info seems like a good thing!

I'm going to merge this now, but we might also consider adding the execution time to this __xonsh__.last attribute.

Thanks @anki-code !