Source code for coalib.bears.requirements.GemRequirement
from coalib.bears.requirements.PackageRequirement import PackageRequirement
from coalib.misc.Shell import call_without_output
import platform
[docs]class GemRequirement(PackageRequirement):
"""
This class is a subclass of ``PackageRequirement``. It specifies the proper
type for ``ruby`` packages automatically and provide a function to check
for the requirement.
"""
def __init__(self, package, version='', require=''):
"""
Constructs a new ``GemRequirement``, using the ``PackageRequirement``
constructor.
>>> pr = GemRequirement('setuptools', '19.2', 'flag')
>>> pr.type
'gem'
>>> pr.package
'setuptools'
>>> pr.version
'19.2'
>>> pr.require
'flag'
:param package: A string with the name of the package to be installed.
:param version: A version string. Leave empty to specify latest version.
:param require: A string that specifies any additional flags, that
would be used with ``require``.
"""
PackageRequirement.__init__(self, 'gem', package, version)
self.require = require
[docs] def is_installed(self):
"""
Checks if the dependency is installed.
:param return: True if dependency is installed, false otherwise.
"""
cmd = ['gem', 'list', '-i', self.package]
if platform.system() == 'Windows': # pragma: no cover
cmd = ['cmd', '/c'] + cmd
return not call_without_output(cmd)