On 18 Aug, 2009, at 9:08, Floris Bruynooghe wrote:
On Tue, Aug 18, 2009 at 05:11:28AM +0300, Alex Grönholm wrote:How would you declare dependencies? Remember that the list of dependencies depends on at least two variables: Python version and platform.Many more, defining a known list of variables to be used to define dependencies is not going to be enough. Maybe there should be a way of having general purpose named conditionals and implement a mapping so that setup.py can define boolean functions for each named conditional. This can then be used for modules etc too instead of just dependencies. The benefit is that you allow developers to specify anything possible, but still allow package management systems to analyse the dependencies and modules etc from static data. They will recognise that something is conditional but are free to do with that knowledge they want. Expressiong conditionals in an elegant-ConfigParser-compatible way might be tricky.
Wouldn't it be good enough to just have the most common use-cases in setup.cfg? The user can still add code to setup.py to tweak the default behaviour when the project does something non-standard.
BTW. One way to do conditionals in ConfigParser files might be:
[dependencies.os9]
use-when: python>=2.7, platform=='macos9'
require: unix-toolbox>=2.5
[dependencies.suse]
use-when: file_exists('/etc/SuSE-release')
require: ...
That is, use a config-key in dependency blocks that describes when the
block should be used. The bit after the '.' in de section-name would
be ignored by distutils and would basicly be comment.
Ronald
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