How to use the zulip.integrations.perforce.git_p4.Command function in zulip

self.userMapFromPerforceServer = True

    def loadUserMapFromCache(self):
        self.users = {}
        self.userMapFromPerforceServer = False
        try:
            cache = open(self.getUserCacheFilename(), "rb")
            lines = cache.readlines()
            cache.close()
            for line in lines:
                entry = line.strip().split("\t")
                self.users[entry[0]] = entry[1]
        except IOError:
            self.getUserMapFromPerforceServer()

class P4Debug(Command):
    def __init__(self):
        Command.__init__(self)
        self.options = []
        self.description = "A tool to debug the output of p4 -G."
        self.needsGit = False

    def run(self, args):
        j = 0
        for output in p4CmdList(args):
            print('Element: %d' % j)
            j += 1
            print(output)
        return True

class P4RollBack(Command):
    def __init__(self):

# Cleanup temporary branches created during import
        if self.tempBranches != []:
            for branch in self.tempBranches:
                read_pipe("git update-ref -d %s" % branch)
            os.rmdir(os.path.join(os.environ.get("GIT_DIR", ".git"), self.tempBranchLocation))

        # Create a symbolic ref p4/HEAD pointing to p4/ to allow
        # a convenient shortcut refname "p4".
        if self.importIntoRemotes:
            head_ref = self.refPrefix + "HEAD"
            if not gitBranchExists(head_ref) and gitBranchExists(self.branch):
                system(["git", "symbolic-ref", head_ref, self.branch])

        return True

class P4Rebase(Command):
    def __init__(self):
        Command.__init__(self)
        self.options = [
                optparse.make_option("--import-labels", dest="importLabels", action="store_true"),
        ]
        self.importLabels = False
        self.description = ("Fetches the latest revision from perforce and "
                            + "rebases the current work (branch) against it")

    def run(self, args):
        sync = P4Sync()
        sync.importLabels = self.importLabels
        sync.run([])

        return self.rebase()

# create a master branch and check out a work tree
        if gitBranchExists(self.branch):
            system([ "git", "branch", "master", self.branch ])
            if not self.cloneBare:
                system([ "git", "checkout", "-f" ])
        else:
            print('Not checking out any branch, use ' \
                  '"git checkout -q -b master "')

        # auto-set this variable if invoked with --use-client-spec
        if self.useClientSpec_from_options:
            system("git config --bool git-p4.useclientspec true")

        return True

class P4Branches(Command):
    def __init__(self):
        Command.__init__(self)
        self.options = [ ]
        self.description = ("Shows the git branches that hold imports and their "
                            + "corresponding perforce depot paths")
        self.verbose = False

    def run(self, args):
        if originP4BranchesExist():
            createOrUpdateBranchesFromOrigin()

        cmdline = "git rev-parse --symbolic "
        cmdline += " --remotes"

        for line in read_pipe_lines(cmdline):
            line = line.strip()

class P4Debug(Command):
    def __init__(self):
        Command.__init__(self)
        self.options = []
        self.description = "A tool to debug the output of p4 -G."
        self.needsGit = False

    def run(self, args):
        j = 0
        for output in p4CmdList(args):
            print('Element: %d' % j)
            j += 1
            print(output)
        return True

class P4RollBack(Command):
    def __init__(self):
        Command.__init__(self)
        self.options = [
            optparse.make_option("--local", dest="rollbackLocalBranches", action="store_true")
        ]
        self.description = "A tool to debug the multi-branch import. Don't use :)"
        self.rollbackLocalBranches = False

    def run(self, args):
        if len(args) != 1:
            return False
        maxChange = int(args[0])

        if "p4ExitCode" in p4Cmd("changes -m 1"):
            die("Problems executing p4");