Re: Extending Zope2 bin/instance run

On 9/3/10 18:21 , Tres Seaver wrote:
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> Wichert Akkerman wrote:
>> I have noticed that now that we are almost exclusively using eggs to
>> distribute our software using "bin/instance run" has become difficult:
>> often the script you want to run is located inside an egg which makes to
>> path to it hard to predict. This is not the most user friendly command:
>>
>>     bin/instance run eggs/my.package-*/my/package/script.py
>>
>> If a user is using a shared egg directory from zc.buildout or something
>> else the egg can be anywhere on the filesystem, making it next to
>> impossible to explain to users.
>>
>> I am considering to modify bin/instance run to check if its first
>> argument is a filesystem path, and if not consider the argument to be a
>> dotted name of a callable which should be invoke. That way backwards
>> compatibility remains, but you can now also do this:
>>
>>     bin/instance run my.package.script.main
>
> What about using something like the EntryPoint syntax:
>
>   $ bin/instance run my.package.script:main
>
> We could even add a new entry point class for it, and allow:
>
>   $ bin/instance run egg:my.package#some_name

I've opted for a third alternative: use an entry point to define the 
extra commands. If you do this in setup.py:

    entry_points="""
       [zopectl.command]
       mycommand = mypackage.commands:func
       """

you can do:

     $ bin/instance mycommand [<args>]

The advantage of this approach is that it makes for more user friendly 
commands that do not needlessly expose implementation details to the
commandline.

Wichert.
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