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from coalib.bears.requirements.PackageRequirement import PackageRequirement
from coalib.misc.Shell import call_without_output
class NpmRequirement(PackageRequirement):
"""
This class is a subclass of ``PackageRequirement``, and helps specifying
requirements from ``npm``, without using the manager name.
def __init__(self, package, version=""):
Constructs a new ``NpmRequirement``, using the ``PackageRequirement``
constructor.
>>> pr = NpmRequirement('ramllint', '6.2')
>>> pr.manager
'npm'
>>> pr.package
'ramllint'
>>> pr.version
'6.2'
:param package: A string with the name of the package to be installed.
:param version: A version string. Leave empty to specify latest version.
PackageRequirement.__init__(self, 'npm', package, version)
def install_command(self):
Creates the installation command for the instance of the class.
>>> NpmRequirement('alex', '2').install_command()
'npm install alex@2'
:param return: A string with the installation command.
return "npm install {}@{}".format(self.package, self.version)
def is_installed(self):
Checks if the dependency is installed.
:param return: True if dependency is installed, false otherwise.
return not call_without_output(['npm', 'show', self.package])
coala-analyzer /
coala
