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from coalib.bears.requirements.PackageRequirement import PackageRequirement |
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from coalib.misc.Shell import call_without_output |
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class GemRequirement(PackageRequirement): |
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""" |
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This class is a subclass of ``PackageRequirement``, and helps specifying |
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requirements from ``gem``, without using the manager name. |
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""" |
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def __init__(self, package, version="", require=""): |
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""" |
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Constructs a new ``GemRequirement``, using the ``PackageRequirement`` |
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constructor. |
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>>> pr = GemRequirement('setuptools', '19.2', 'flag') |
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>>> pr.manager |
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'gem' |
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>>> pr.package |
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'setuptools' |
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>>> pr.version |
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'19.2' |
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>>> pr.require |
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'flag' |
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:param package: A string with the name of the package to be installed. |
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:param version: A version string. Leave empty to specify latest version. |
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:param require: A string that specifies any additional flags, that |
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would be used with ``require``. |
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""" |
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PackageRequirement.__init__(self, 'gem', package, version) |
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self.require = require |
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def install_command(self): |
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""" |
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Creates the installation command for the instance of the class. |
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>>> GemRequirement('rubocop').install_command() |
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'gem install rubocop' |
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>>> GemRequirement('scss_lint', '', 'false').install_command() |
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"gem install 'scss_lint', require: false" |
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:param return: A string with the installation command. |
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""" |
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if self.require: |
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return "gem install '{}', require: {}".format(self.package, |
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self.require) |
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return "gem install {}".format(self.package) |
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def is_installed(self): |
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""" |
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Checks if the dependency is installed. |
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:param return: True if dependency is installed, false otherwise. |
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""" |
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return not call_without_output(['gem', 'list', '-i', self.package]) |
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coala-analyzer /
coala
