/stdhome

# diff.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, os

from subprocess import call

from .command import Command

import stdhome.the as the

from stdhome.deployment import Deployment

from stdhome.walker.status import StatusWalker

class DiffCommand( Command ):

	def print_help( self ):

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

		print()

		#      01234567890123456789012345678901234567890123456789012345678901234567890123456789

		print("Show differences between the files in the local repository and those in the home")

		print("directory.")

		print()

		print("This runs the diff command, showing you differences made to files in the home")

		print("directory as compared to the files in the local repository.  The differences")

		print("between all files in the local repository are shown by default, or you can")

		print("specify files that you are interested in.")

		print()

		print("To see a list files that this command will show differences for, you can go:")

		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.search( '^[-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 status

		walker = StatusWalker( files if files else None )

		walker.walk()

		# information (rather than modifications) come first

		message = ''

		for file in walker.missing:

			message += "\033[33m=== missing file '%s'\n" % file

		for file in walker.changed:

			message += "\033[33m=== kind changed '%s'\n" % file

		if message: print(message.rstrip())

		# call colordiff

		for file in walker.modified:

			print(( "\033[33m=== modified '%s'\n" % file ).rstrip())

			sys.stdout.flush()

			call( [ 'colordiff', '-ud',

					'--label', file,

					os.path.join( the.repo.full_dir, file ),

					'--label', file,

					os.path.join( the.full_home_dir, file ) ] )