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from coalib.bears.requirements.PackageRequirement import PackageRequirement |
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import subprocess |
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class NpmRequirement(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 ``npm``, without using the manager name. |
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""" |
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def __init__(self, package, version=""): |
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""" |
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Constructs a new ``NpmRequirement``, using the ``PackageRequirement`` |
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constructor. |
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>>> pr = NpmRequirement('ramllint', '6.2') |
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>>> pr.manager |
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'npm' |
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>>> pr.package |
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'ramllint' |
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>>> pr.version |
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'6.2' |
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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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""" |
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PackageRequirement.__init__(self, 'npm', package, version) |
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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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>>> NpmRequirement('alex', '2').install_command() |
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'npm install alex@2' |
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:param return: A string with the installation command. |
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""" |
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return "npm install {}@{}".format(self.package, self.version) |
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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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>>> NpmRequirement('npm').is_installed() |
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True |
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>>> NpmRequirement('some_package_that_doesnt_exist').is_installed() |
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False |
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:param return: True if dependency is installed, false otherwise. |
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""" |
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return not subprocess.call(['npm', 'show', self.package], |
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stdout=subprocess.DEVNULL, |
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stderr=subprocess.DEVNULL) |
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coala-analyzer /
coala
