/stdhome

# file_matcher.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 os, re, errno

class FileMatcher:

	def __init__( self, file, section = None ):

		self.file = file

		self.section = section

		self.patterns = list()

		self.read()

	def read( self ):

		# read file

		file = os.path.expanduser( self.file )

		try:

			with open( file ) as f:

				lines = f.readlines()

		except IOError as e:

			if e.errno != errno.ENOENT: raise

			lines = list()

		# parse file

		capture = False if self.section else True

		for line in lines:

			# clean up line and skip empty lines and comments

			line = line.strip();

			if not len( line ): continue

			if line[ :1 ] == '#': continue

			# if section is set, capture lines after the section heading and

			# only until the next heading

			if capture:

				if self.section and re.match( '\[', line ): break

				self.patterns.append( self.convert_line_to_regex( line ) )

			elif self.section and line == '[' + self.section + ']':

				capture = True

	def convert_line_to_regex( self, line ):

		# detect (and remove) quotes

#		quotes = None

#		if line[ :1 ] == line[ -1: ] and line[ :1 ] in list( "'", '"' ):

#			quotes = line[ :1 ]

#			line = line[ 1:-1 ]

		# detect escaped chars

#		if quotes ==

		# convert * and ?

		line = re.sub( r'\?', '.', line )

		line = re.sub( r'\*', '.*', line )

		line = "^%s$" % ( line )

		return line

	def matches( self, rel_file ):

		for pattern in self.patterns:

			if re.search( pattern, rel_file ):

				return True

		return False

	def __str__( self ):

		content = "', '".join( self.patterns )

		if content: content = " '" + content + "' "

		return "FileMatcher(" + content + ")"