#237 WIP: Add -m argument to execute pythons module

[jcarizza]

The idea behind this PR is to use the parameter -m and --module to run modules as script. For example:

echo '{"foo": "bar"}' | fades -m json.tool
{
    "foo": "bar"
}

# or

fades -m http.server                      
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...

# or passing parameters

fades -m "http.server -b 127.0.0.1 9000"
Serving HTTP on 127.0.0.1 port 9000 (http://0.0.0.0:9000/) 

There is a work around as @gilgamezh said:

fades -x python -m http.server

So far, the work around has worked for me..but maybe is time to formalize it?

How this shoud be tested?

[facundobatista]

Hola Juan!

Some installed python modules/scripts can be executed "as a module", so you may do python -m foobar.

In "fades world" that would be translated to fades -d foobar -x python -m foobar (in English: create a virtualenv with foobar dependency, and inside there execute python passing "-m foobar" parameters).

We want a shortcut for that, so you may do fades -d foobar -m foobar or fades -d foobar --module foobar.

Yes, it looks a little repetitive, but the dependency should always be explicit.

At code level, I guess you could translate internally "-m foobar" to "-x python -m foobar", and that should be enough. Regarding testing this, don't know how much can be done now. We REALLY need #345 to be done.

[coveralls]

Coverage decreased (-0.5%) to 81.188% when pulling fcdd4be on jcarizza:master into 5e5002b on PyAr:master.

[facundobatista]

I think this is the wrong place to insert this new behaviour.

There's a big if down there, first part is running interactive Python shell (with interactive=True), the second is running a child program somehow. This new --module behaviour belongs to the else part of this if.

IIUC, it would have a args.executable, but you should double check it.

Thanks!

[gilgamezh]

please rebase after we merge #387

[gilgamezh]

@jcarizza cierro el PR por ahora. si retomas el laburo lo volvés a abrir. gracias!

[facundobatista]

I'll use part of this for a future branch.