Synnefo » ./kamaki

#!/usr/bin/env python

# Copyright 2012-2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import codecs

class History(object):

    def __init__(self, filepath, token=None, max_lines=0):

        self.filepath = filepath

        self.token = token

        self.max_lines = max_lines

    def __getitem__(self, cmd_ids):

        with codecs.open(self.filepath, mode='r', encoding='utf-8') as f:

            try:

                cmd_list = f.readlines()

                return cmd_list[cmd_ids]

            except IndexError:

                return None

    @classmethod

    def _match(self, line, match_terms):

        if match_terms:

            return all(term in line for term in match_terms.split())

        return True

    def get(self, match_terms=None, limit=0):

        limit = int(limit or 0)

        r = ['%s.\t%s' % (i + 1, line) for i, line in enumerate(self[:]) if (

                self._match(line, match_terms))]

        return r[- limit:]

    def add(self, line):

        line = line.replace(self.token, '...') if self.token else line

        with codecs.open(self.filepath, mode='a+', encoding='utf-8') as f:

            f.write(line + '\n')

            f.flush()

    def empty(self):

        with open(self.filepath, 'w') as f:

            f.flush()

    def clean(self):

        """DEPRECATED since version 0.14"""

        return self.empty()

    def retrieve(self, cmd_id):

        if not cmd_id:

            return None

        cmd_id = int(cmd_id)

        return self[cmd_id - (1 if cmd_id > 0 else 0)]