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from coalib.bears.requirements.PackageRequirement import PackageRequirement |
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from coalib.misc.Shell import run_shell_command |
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class RscriptRequirement(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 ``R``, without using the manager name. |
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""" |
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def __init__(self, package, version="", flag="", repo=""): |
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""" |
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Constructs a new ``RscriptRequirement``, using the |
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``PackageRequirement`` constructor. |
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>>> pr = RscriptRequirement( |
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... 'formatR', version='1.4', flag='-e', |
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... repo="http://cran.rstudio.com") |
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>>> pr.manager |
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'R' |
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>>> pr.package |
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'formatR' |
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>>> pr.version |
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'1.4' |
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>>> pr.flag |
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'-e' |
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>>> pr.repo |
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'http://cran.rstudio.com' |
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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 flag: A string that specifies any additional flags, that |
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are passed to the manager. |
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:param repo: The repository from which the package to be installed is |
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from. |
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""" |
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PackageRequirement.__init__(self, 'R', package, version) |
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self.flag = flag |
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self.repo = repo |
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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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>>> RscriptRequirement( |
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... 'formatR', '' , '-e', |
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... 'http://cran.rstudio.com').install_command() |
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'R -e "install.packages(\"formatR\", repo=\"http://cran.rstudio.com\", dependencies=TRUE)"' |
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:param return: A string with the installation command. |
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""" |
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return ('R {} "install.packages(\"{}\", repo=\"{}\", ' |
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'dependencies=TRUE)"'.format(self.flag, |
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self.package, self.repo)) |
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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 True if run_shell_command( |
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('R -e \'library(\"{}\", quietly=TRUE)\'' |
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.format(self.package)))[1] is '' else False |
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