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Viewing changes to lib/stdhome/walker/walker.py

  • Committer: Tim Marston
  • Date: 2021-07-05 19:14:32 UTC
  • Revision ID: tim@ed.am-20210705191432-243ayb7s2nmussvi
python3ification

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lib/stdhome/walker/walker.py
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import os
 
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import stdhome.the as the
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class Walker:
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        process() for more information.
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        """
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        def walk( self ):
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                """Iterates over self.walk_list, calling process() for each entry in turn.  For
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                directory entries, where process() returns False, subsequent entries in
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                walk_list that fall under the directory are skipped.
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                """
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                if the.verbose >= 3:
 
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                        print("walking [%s]" % self.__class__.__name__)
 
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                skip = ''
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                for rel_file in self.walk_list:
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                        # if we're skipping, skip entries in subdirectories, or turn off
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                                else:
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                                        skip = ''
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                        src_file = os.path.join( self.src_dir, rel_file )
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                        dst_file = os.path.join( self.dst_dir, rel_file )
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                        src_type = Walker.get_file_type( src_file )
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                        dst_type = Walker.get_file_type( dst_file )
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                        recurse = self.process(
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                                rel_file, src_file, src_type, dst_file, dst_type )
 
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                        src = Walker.File( os.path.join( self.src_dir, rel_file ) )
 
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                        dst = Walker.File( os.path.join( self.dst_dir, rel_file ) )
 
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                        # process ths entry
 
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                        recurse = self.process( rel_file, src, dst )
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                        # Set up skipping, as required.  Note that we don't check to see if
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                        # we're dealing with a directory here.  We can't, because we've no
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                        # way of knowing what to check.  It could be src_type or dst_type
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                        # (if src_dir or dst_dir was used to generate the walk list) or it
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                        # could be neither (if the walk list came from somewhere else).  But
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                        # it shouldn't matter.  We adding an os.pathset to the end of the
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                        # filename, so it wuill only match files that are descendents of a
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                        # directory with the name of this file.
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                        if not recurse: skip = rel_file + os.pathsep
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        @staticmethod
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        def get_file_type( full_file ):
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                """Returns the type of a given file, at the time of calling.  Types are 'd' for
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                directory, 'f' for file, 'l' for symlink, '_' for missing and '?' for
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                anything else.
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                """
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                if not os.path.lexists( full_file ):
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                        return '_'
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                elif os.path.islink( full_file ):
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                        return 'l'
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                elif os.path.isfile( full_file ):
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                        return 'f'
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                elif os.path.isdir( full_file ):
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                        return 'd'
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                else:
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                        return '?'
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        @staticmethod
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        def generate_walk_list( full_dir, rel_file = '' ):
 
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                        # it shouldn't matter: we add a path seperateor (os.sep) to the end
 
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                        # of the filename, so it wuill only match files that are descendents
 
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                        # of a directory with the name of this file.
 
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                        if not recurse: skip = rel_file + os.sep
 
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        class File:
 
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                def __init__( self, full_file ):
 
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                        self.file = full_file
 
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                        if not os.path.exists( self.file ):
 
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                                self.type = '_'
 
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                        elif os.path.isfile( self.file ):
 
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                                self.type = 'f'
 
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                        elif os.path.isdir( self.file ):
 
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                                self.type = 'd'
 
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                        else:
 
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                                self.type = '?'
 
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                        if os.path.islink( self.file ):
 
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                                self.link_type = self.type
 
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                                self.type = 'l'
 
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                        else:
 
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                                self.link_type = False
 
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                def get_type_name( self ):
 
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                        if self.type == 'l': return 'symlink'
 
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                        elif self.type == 'f': return 'file'
 
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                        elif self.type == 'd': return 'directory'
 
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                        elif self.type == '_': return 'missing'
 
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                        else: return 'unknown'
 
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                def __str__( self ):
 
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                        type = self.type
 
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                        if( self.link_type ): type += '/' + self.link_type
 
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                        return 'File( %s (%s) )' % ( self.file, type )
 
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        @staticmethod
 
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        def generate_walk_list( full_dir, rel_file = '', recurse = True ):
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                """Returns a list of files and directories in full_dir, specified as relative
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                files (relative to full_dir), breadth first.
 
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                """
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                # ignore some files
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                if rel_file in { '.bzr', '.stdhome' }: return list()
 
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                static_ignores = [ '.stdhome', '.stdhomerc' ] + \
 
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                                                 the.repo.vcs.ignored_files
 
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                if rel_file in static_ignores:
 
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                        return list()
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                full_file = os.path.join( full_dir, rel_file )
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                # directories are returned and recursed in to
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                elif os.path.isdir( full_file ):
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                        ret = [ rel_file ] if rel_file != '' else []
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                        for file in os.listdir( full_file ):
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                                ret.extend( Walker.generate_walk_list(
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                                        full_dir, os.path.join( rel_file, file ) ) )
 
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                        if recurse:
 
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                                for file in os.listdir( full_file ):
 
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                                        ret.extend( Walker.generate_walk_list(
 
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                                                full_dir, os.path.join( rel_file, file ) ) )
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                        return sorted( ret )
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                # other kinds are invalid
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                else:
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                        raise RuntimeError(
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                                'unknown/exotic file: %s' % full_file )
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        @staticmethod
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        def name_of_type( type ):
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                if type == 'd': return 'a directory'
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                elif type == 'f': return 'a file'
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                elif type == 'l': return 'a symlink'
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                elif type == '_': return 'missing'
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                else: return 'something exotic'