92 lines
2.5 KiB
Python
92 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 Mirantis, Inc.
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#
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# This program 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 2 of the License, or
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# (at your option) any later version.
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#
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# This program 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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import json
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import os
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import yaml
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import six
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_PARSERS = {
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"": yaml.safe_load,
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".json": json.load,
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".yaml": yaml.safe_load,
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".yml": yaml.safe_load,
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}
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def read_from_file(filename):
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"""Reads lines from file.
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Note: the line starts with '#' will be skipped.
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:param filename: the path of target file
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:return: the list of lines from file
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:raise ValuerError: when file-ext is unknown.
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"""
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if filename is None:
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return
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file_ext = os.path.splitext(filename)[-1].lower()
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try:
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parser = _PARSERS[file_ext]
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except KeyError:
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raise ValueError("Unsupported file format: {0}.\n"
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"Please use '.json' or '.yaml' file extension"
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.format(file_ext))
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with open(filename, 'r') as f:
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return parser(f)
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def get_object_attrs(obj, attrs):
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"""Gets object attributes as list.
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:param obj: the target object
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:param attrs: the list of attributes
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:return: list of values from specified attributes.
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"""
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return [getattr(obj, f) for f in attrs]
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def get_display_value(value):
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"""Get the displayable string for value.
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:param value: the target value
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:return: the displayable string for value
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"""
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if value is None:
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return u"-"
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if isinstance(value, list):
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return u", ".join(six.text_type(x) for x in value)
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return six.text_type(value)
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def make_display_attr_getter(attrs):
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"""Gets formatter to convert attributes of object in displayable format.
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:param attrs: the list of attributes
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:return: the formatter (callable object)
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"""
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return lambda x: [
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get_display_value(v) for v in get_object_attrs(x, attrs)
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]
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