Launch shpec as zsh plugin is limiting

[ezh]

Right now shpec is alias

which shpec
shpec: aliased to zsh -c 'disable -r end; . /full/path/to/shpec'

1. this prevents to pass arguments to shpec
   shpec -v, shpec file is not working
2. this drop the current zsh environment with all defined functions

I offer to use function instead of alias.
We may guard execution with ()

(disable -r time;which time); which time
/usr/bin/time
time: shell reserved word

It maybe something like

__shpec_location="$(dirname $0:A)/bin/shpec"
shpec() { (disable -r end; . $__shpec_location $@) }

There is a problem with multiple arguments, but this is different issue.

[ezh]

Enlighten shpec mailfunction:
https://travis-ci.org/ezh/shpec/builds/217703619

Unable to process files with space in name:
bash https://travis-ci.org/ezh/shpec/jobs/217703621
dash https://travis-ci.org/ezh/shpec/jobs/217703622
ksh https://travis-ci.org/ezh/shpec/jobs/217703623

Please note that errors within zsh are different
One test in multiple_args block are passed and this is second argument. zsh alias is broken.
zsh https://travis-ci.org/ezh/shpec/jobs/217703624

[ezh]

I'm happy to fix it up in #107
Rebase on master branch with OSX in test matrix was a bit tough. 😄

[rylnd]

@AdrieanKhisbe @ezh I could use your help here. I'm trying to reproduce this issue on CI for a regression test and I'm having some trouble.

As per my comment, the way that we run unit tests and the way that the shpec executable is interpreted means that we can't write a unit test for the antigen plugin (at least as it currently exists). Couple that with the inability to execute aliases on Travis, and I'm at a loss.

I would love it if we could somehow write a regression test for this (and for argument handling of the executable in general), but since that seems like a lot of effort for not a lot of gain, I would be happy with just fixing the damn plugin 😉.

@ezh, I would love to give you credit for your time and effort on this issue; if you could submit a PR with just your changes to the antigen plugin, @AdrieanKhisbe and I can test it independently and then merge.