"""
mercurial front end API using hg CLI
"""

import subprocess
from subprocess import check_output as call

class Hg(object):
    """front end to mercurial using subprocess"""

    def __init__(self, path, hg=None):
        self.hg = hg or 'hg'
        self.path = path

    def __call__(self, *args):
        call([self.hg] + list(args))

    def commits(self, start, finish=None):
        """
        list all commits in a range: [start..finish]
        if `finish` is omitted, tip is used
        """

        output = self("log", "", "--template", "{rev}\n")
        return [line.strip() for line in output.strip().splitlines()]

    def clone(self):
        """clone a repo"""

        # TODO: how does this fit in with path?
        # probably ideally anything this class does can operate locally
        # or remotely (using a local clone for staging when needed)

        # TODO:
        # fill out .hgrc files default-push