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from __future__ import unicode_literals

import os

import os.path

import subprocess

from pre_commit.util import cmd_output

class PrefixedCommandRunner(object):

"""A PrefixedCommandRunner allows you to run subprocess commands with

comand substitution.

For instance:

PrefixedCommandRunner('/tmp/foo').run(['{prefix}foo.sh', 'bar', 'baz'])

will run ['/tmp/foo/foo.sh', 'bar', 'baz']

"""

def __init__(

self,

prefix_dir,

popen=subprocess.Popen,

makedirs=os.makedirs

self.prefix_dir = prefix_dir.rstrip(os.sep) + os.sep

self.__popen = popen

self.__makedirs = makedirs

def _create_path_if_not_exists(self):

if not os.path.exists(self.prefix_dir):

self.__makedirs(self.prefix_dir)

def run(self, cmd, **kwargs):

self._create_path_if_not_exists()

replaced_cmd = [

part.replace('{prefix}', self.prefix_dir) for part in cmd

]

return cmd_output(*replaced_cmd, __popen=self.__popen, **kwargs)

def path(self, *parts):

path = os.path.join(self.prefix_dir, *parts)

return os.path.normpath(path)

def exists(self, *parts):

return os.path.exists(self.path(*parts))

@classmethod

def from_command_runner(cls, command_runner, path_end):

"""Constructs a new command runner from an existing one by appending

`path_end` to the command runner's prefix directory.

"""

return cls(

command_runner.path(path_end),

popen=command_runner.__popen,

makedirs=command_runner.__makedirs,

)

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