/stdhome

# revert.py

#

# Copyright (C) 2014 Tim Marston <tim@edm.am>

#

# This file is part of stdhome (hereafter referred to as "this program").

# See http://ed.am/dev/stdhome for more information.

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import sys, re, getopt

from command import Command

import stdhome.the as the

from stdhome.deployment import Deployment

from stdhome.walker.copy_out import CopyOutWalker

class RevertCommand( Command ):

	def print_help( self ):

		print "Usage: " + the.program.name + " revert [--repo=REPO] [FILE]..."

		print

		#      01234567890123456789012345678901234567890123456789012345678901234567890123456789

		print "Revert any local changes to a file in the home directory."

		print

		print "This reverts the content of the named files, in the local filesystem, specified"

		print "relative to the home directory, to its state in the repo."

		print

		print "To see a list files that can be reverted, type:"

		print "    " + the.program.name + " status"

		print

		print "Options:"

		print "  -r, --repo=REPO  select the repo to check-out or create (defaults to 'home')"

		print "  -v, --verbose    display information about what is being done"

		print "      --help       display help and exit"

		exit( 0 )

	def parse_command_line( self ):

		opts, args = getopt.gnu_getopt(

			sys.argv[ 1: ], "r:v",

			[ "repo=", "verbose", "help" ] )

		for opt, optarg in opts:

			if opt in [ '--repo', '-r' ]:

				if not re.match( '^[-a-zA-z0-9.]+$', optarg ):

					raise the.program.FatalError(

						'invalid repository name: ' + optarg )

				the.repo = optarg

			elif opt in [ '--verbose', '-v' ]:

				the.verbose += 1

			elif opt == "--help":

				self.print_help()

		# discard first argument (the command)

		args.pop( 0 )

		# remaining arguments

		self.files = args

	def run( self ):

		# set up repo and check it exists

		the.repo.check_dir_exists()

		# determine files

		files = self.expand_files( self.files )

		# initialise deployment and ensure it's not ongoing

		deployment = Deployment()

		deployment.check_ongoing( False )

		# check for local changes

		if the.repo.vcs.has_changes():

			raise the.program.FatalError(

				'repo has local changes: %s\n'

				'Hint: see "%s stage-revert --help"' % 

				( the.repo.name, the.program.name ) )

		# check status

		walker = CopyOutWalker( files if files else None )

		walker.walk()