gem.py 文件源码

def installed(self):
        """ Fetch installed packages from ``gem list`` output.

        Raw CLI output samples:

        .. code-block:: shell-session

            $ gem list

            *** LOCAL GEMS ***

            bigdecimal (1.2.0)
            CFPropertyList (2.2.8)
            io-console (0.4.2)
            json (1.7.7)
            libxml-ruby (2.6.0)
            molinillo (0.5.4, 0.4.5, 0.2.3)
            nokogiri (1.5.6)
            psych (2.0.0)
            rake (0.9.6)
            rdoc (4.0.0)
            sqlite3 (1.3.7)
            test-unit (2.0.0.0)
        """
        installed = {}

        output = self.run([self.cli_path] + self.cli_args + ['list'])

        if output:
            regexp = re.compile(r'(\S+) \((.+)\)')
            for package in output.split('\n'):
                match = regexp.match(package)
                if match:
                    package_id, versions = match.groups()

                    # Guess latest installed version.
                    versions = set([v.strip() for v in versions.split(',')])
                    # Parse versions to avoid lexicographic sorting gotchas.
                    version = None
                    if versions:
                        _, version = max(
                            [(parse_version(v), v) for v in versions])

                    installed[package_id] = {
                        'id': package_id,
                        'name': package_id,
                        'installed_version': version}

        return installed