/stdhome

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# conflict_walker.py
#
# Copyright (C) 2013 to 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/>.


from walker import Walker
import stdhome.the as the


class ConflictWalker( Walker ):
	"""The conflict walker traverses the repo looking for "deployment conflicts"
	(i.e., changes in the type of file).  This is run prior to running the
	copy-out walker and, as such, is given a list of files that were copied-in
	and which is can, therefore, safely ignore.  It can also be given a list of
	files affected by the update (it will walk all repo files otherwise).

	Walker source:       repo
	Walker destination:  home dir
	Walker traversing:   repo
	"""

	def __init__( self, ignore_files, affected_files = None ):
		self.src_dir = the.repo.full_dir
		self.dst_dir = the.full_fsdir
		self.walk_list = affected_files if affected_files is not None else \
						 self.generate_walk_list( the.repo.full_dir )

		self.ignore_files = ignore_files
		self.changed = list()


	def process( self, rel_file, src_file, src_type, dst_file, dst_type ):

		# if entity is missing in home dir, it's ok to copy out (and there's no
		# need to recurse)
		if dst_type == '_': return False

		# if entity was copied-in, it's ok to copy out
		if rel_file in self.ignore_files:
			# we recurse only if this is a directory in the home dir, because if
			# it isn't copying-out will replace whatever's in the home dir with
			# the whole directory from the repo
			return dst_type == 'd'

		# entity has changed type?
		elif src_type != dst_type:
			self.changed.append( "%s (now %s)" % (
				rel_file, self.name_of_type( src_type ) ) )

			# if an entity has changed to/from a directory, we don't care about
			# anything that directory does/did contain
			return False

		# nothing to see here
		return True