99 lines
3.4 KiB
Python
99 lines
3.4 KiB
Python
# Copyright 2014 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Parser for line-based configurations like histories."""
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import os
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import os.path
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import logging
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from PyQt5.QtCore import pyqtSlot
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class LineConfigParser:
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"""Parser for configuration files which are simply line-based.
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Attributes:
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data: A list of lines.
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_configdir: The directory to read the config from.
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_configfile: The config file path.
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"""
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def __init__(self, configdir, fname, limit=None):
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"""Config constructor.
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Args:
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configdir: Directory to read the config from.
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fname: Filename of the config file.
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limit: Config tuple (section, option) which contains a limit.
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"""
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self._configdir = configdir
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self._configfile = os.path.join(self._configdir, fname)
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self._limit = limit
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if not os.path.isfile(self._configfile):
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self.data = []
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else:
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logging.debug("Reading config from {}".format(self._configfile))
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self.read(self._configfile)
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def read(self, filename):
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"""Read the data from a file."""
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with open(filename, 'r', encoding='utf-8') as f:
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self.data = [line.rstrip('\n') for line in f.readlines()]
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def write(self, fp, limit=-1):
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"""Write the data to a file.
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Args:
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fp: A file object to write the data to.
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limit: How many lines to write, or -1 for no limit.
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"""
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if limit == -1:
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data = self.data
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else:
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data = self.data[-limit:]
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fp.write('\n'.join(data))
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def save(self):
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"""Save the config file."""
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if not self.data:
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logging.debug("No data to save.")
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return
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# We need to import this here because config needs LineConfigParser.
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import qutebrowser.config.config as config
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limit = -1 if self._limit is None else config.get(*self._limit)
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if limit == 0:
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return
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if not os.path.exists(self._configdir):
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os.makedirs(self._configdir, 0o755)
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logging.debug("Saving config to {}".format(self._configfile))
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with open(self._configfile, 'w', encoding='utf-8') as f:
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self.write(f, limit)
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@pyqtSlot(str, str)
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def on_config_changed(self, section, option):
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"""Delete the file if the limit was changed to 0."""
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if self._limit is None:
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return
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# We need to import this here because config needs LineConfigParser.
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import qutebrowser.config.config as config
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value = config.get(section, option)
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if (section, option) == self._limit and value == 0:
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if os.path.exists(self._configfile):
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os.remove(self._configfile)
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