Support for package managers

[ufoym]

Support for package managers

[kklemon]

This was also my initial idea and I also made a rough implementation for this. It introduces a PackageManager base class which can be inherited to realize specific package managers. Each such implementation, for example an PipPackageManager class would take a package name as argument and then produce the corresponding install statement in its build() method. The only problem I encountered is that Composer is designed to work on base of module/classes and not their instances. This leads to the situation that you can't pass different instances of a single module (e.g. different instances of a PackageManager, each for a single pip package) to the composer. I don't know how to solve this properly at the moment except to redesign the code base to let the Composer take instances of modules.

Another approach I wanted to try is that each package manager module collects the packages to be installed in a class attribute before the composer is invoked. The composer then instantiates each module in the same way as it is done currently and each package manager would then just build a single install statement with all packages that have been registered before.

If it is not completely clear what I mean, I could provide a basic implementation in the next days.

[ufoym]

That's a great idea.

How about parsing the input strings like pip+pandas apt+ping in

deepo/generator/generate.py

Lines 29 to 34 in e384038

	for module in args.modules:
	terms = module.split('==')
	m = _import(terms[0])
	in_modules.append(m)
	if len(terms) > 1:
	versions[m] = terms[1]

then making a list of apt-modules & pip-modules and passing them into the Composer

deepo/generator/generate.py

Line 35 in e384038

composer = Composer(in_modules, args.cuda_ver, args.cudnn_ver, versions)

and finally generating the corresponding scripts here:

deepo/generator/core/composer.py

Line 61 in e384038

'\n',

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