/stdhome

To get this branch, use:
bzr branch http://bzr.ed.am/stdhome
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# 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 )

		return line


	def matches( self, rel_file ):
		for pattern in self.patterns:
			if re.match( pattern, rel_file ):
				return True
		return False


	def __str__( self ):
		content = "', '".join( self.patterns )
		if content: content = " '" + content + "' "
		return "FileMatcher(" + content + ")"