301 lines
11 KiB
Python
301 lines
11 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""Read and write an application's config files."""
|
|
|
|
from __future__ import unicode_literals
|
|
import io
|
|
import logging
|
|
import os
|
|
|
|
from configobj import ConfigObj, ConfigObjError
|
|
from validate import ValidateError, Validator
|
|
|
|
from .compat import MAC, text_type, UserDict, WIN
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ConfigError(Exception):
|
|
"""Base class for exceptions in this module."""
|
|
|
|
pass
|
|
|
|
|
|
class DefaultConfigValidationError(ConfigError):
|
|
"""Indicates the default config file did not validate correctly."""
|
|
|
|
pass
|
|
|
|
|
|
class Config(UserDict, object):
|
|
"""Config reader/writer class.
|
|
|
|
:param str app_name: The application's name.
|
|
:param str app_author: The application author/organization.
|
|
:param str filename: The config filename to look for (e.g. ``config``).
|
|
:param dict/str default: The default config values or absolute path to
|
|
config file.
|
|
:param bool validate: Whether or not to validate the config file.
|
|
:param bool write_default: Whether or not to write the default config
|
|
file to the user config directory if it doesn't
|
|
already exist.
|
|
:param tuple additional_dirs: Additional directories to check for a config
|
|
file.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
app_name,
|
|
app_author,
|
|
filename,
|
|
default=None,
|
|
validate=False,
|
|
write_default=False,
|
|
additional_dirs=(),
|
|
):
|
|
super(Config, self).__init__()
|
|
#: The :class:`ConfigObj` instance.
|
|
self.data = ConfigObj(encoding="utf8")
|
|
|
|
self.default = {}
|
|
self.default_file = self.default_config = None
|
|
self.config_filenames = []
|
|
|
|
self.app_name, self.app_author = app_name, app_author
|
|
self.filename = filename
|
|
self.write_default = write_default
|
|
self.validate = validate
|
|
self.additional_dirs = additional_dirs
|
|
|
|
if isinstance(default, dict):
|
|
self.default = default
|
|
self.update(default)
|
|
elif isinstance(default, text_type):
|
|
self.default_file = default
|
|
elif default is not None:
|
|
raise TypeError(
|
|
'"default" must be a dict or {}, not {}'.format(
|
|
text_type.__name__, type(default)
|
|
)
|
|
)
|
|
|
|
if self.write_default and not self.default_file:
|
|
raise ValueError(
|
|
'Cannot use "write_default" without specifying ' "a default file."
|
|
)
|
|
|
|
if self.validate and not self.default_file:
|
|
raise ValueError(
|
|
'Cannot use "validate" without specifying a ' "default file."
|
|
)
|
|
|
|
def read_default_config(self):
|
|
"""Read the default config file.
|
|
|
|
:raises DefaultConfigValidationError: There was a validation error with
|
|
the *default* file.
|
|
"""
|
|
if self.validate:
|
|
self.default_config = ConfigObj(
|
|
configspec=self.default_file,
|
|
list_values=False,
|
|
_inspec=True,
|
|
encoding="utf8",
|
|
)
|
|
# ConfigObj does not set the encoding on the configspec.
|
|
self.default_config.configspec.encoding = "utf8"
|
|
|
|
valid = self.default_config.validate(
|
|
Validator(), copy=True, preserve_errors=True
|
|
)
|
|
if valid is not True:
|
|
for name, section in valid.items():
|
|
if section is True:
|
|
continue
|
|
for key, value in section.items():
|
|
if isinstance(value, ValidateError):
|
|
raise DefaultConfigValidationError(
|
|
'section [{}], key "{}": {}'.format(name, key, value)
|
|
)
|
|
elif self.default_file:
|
|
self.default_config, _ = self.read_config_file(self.default_file)
|
|
|
|
self.update(self.default_config)
|
|
|
|
def read(self):
|
|
"""Read the default, additional, system, and user config files.
|
|
|
|
:raises DefaultConfigValidationError: There was a validation error with
|
|
the *default* file.
|
|
"""
|
|
if self.default_file:
|
|
self.read_default_config()
|
|
return self.read_config_files(self.all_config_files())
|
|
|
|
def user_config_file(self):
|
|
"""Get the absolute path to the user config file."""
|
|
return os.path.join(
|
|
get_user_config_dir(self.app_name, self.app_author), self.filename
|
|
)
|
|
|
|
def system_config_files(self):
|
|
"""Get a list of absolute paths to the system config files."""
|
|
return [
|
|
os.path.join(f, self.filename)
|
|
for f in get_system_config_dirs(self.app_name, self.app_author)
|
|
]
|
|
|
|
def additional_files(self):
|
|
"""Get a list of absolute paths to the additional config files."""
|
|
return [os.path.join(f, self.filename) for f in self.additional_dirs]
|
|
|
|
def all_config_files(self):
|
|
"""Get a list of absolute paths to all the config files."""
|
|
return (
|
|
self.additional_files()
|
|
+ self.system_config_files()
|
|
+ [self.user_config_file()]
|
|
)
|
|
|
|
def write_default_config(self, overwrite=False):
|
|
"""Write the default config to the user's config file.
|
|
|
|
:param bool overwrite: Write over an existing config if it exists.
|
|
"""
|
|
destination = self.user_config_file()
|
|
if not overwrite and os.path.exists(destination):
|
|
return
|
|
|
|
with io.open(destination, mode="wb") as f:
|
|
self.default_config.write(f)
|
|
|
|
def write(self, outfile=None, section=None):
|
|
"""Write the current config to a file (defaults to user config).
|
|
|
|
:param str outfile: The path to the file to write to.
|
|
:param None/str section: The config section to write, or :data:`None`
|
|
to write the entire config.
|
|
"""
|
|
with io.open(outfile or self.user_config_file(), "wb") as f:
|
|
self.data.write(outfile=f, section=section)
|
|
|
|
def read_config_file(self, f):
|
|
"""Read a config file *f*.
|
|
|
|
:param str f: The path to a file to read.
|
|
"""
|
|
configspec = self.default_file if self.validate else None
|
|
try:
|
|
config = ConfigObj(
|
|
infile=f, configspec=configspec, interpolation=False, encoding="utf8"
|
|
)
|
|
# ConfigObj does not set the encoding on the configspec.
|
|
if config.configspec is not None:
|
|
config.configspec.encoding = "utf8"
|
|
except ConfigObjError as e:
|
|
logger.warning(
|
|
"Unable to parse line {} of config file {}".format(e.line_number, f)
|
|
)
|
|
config = e.config
|
|
|
|
valid = True
|
|
if self.validate:
|
|
valid = config.validate(Validator(), preserve_errors=True, copy=True)
|
|
if bool(config):
|
|
self.config_filenames.append(config.filename)
|
|
|
|
return config, valid
|
|
|
|
def read_config_files(self, files):
|
|
"""Read a list of config files.
|
|
|
|
:param iterable files: An iterable (e.g. list) of files to read.
|
|
"""
|
|
errors = {}
|
|
for _file in files:
|
|
config, valid = self.read_config_file(_file)
|
|
self.update(config)
|
|
if valid is not True:
|
|
errors[_file] = valid
|
|
return errors or True
|
|
|
|
|
|
def get_user_config_dir(app_name, app_author, roaming=True, force_xdg=True):
|
|
"""Returns the config folder for the application. The default behavior
|
|
is to return whatever is most appropriate for the operating system.
|
|
|
|
For an example application called ``"My App"`` by ``"Acme"``,
|
|
something like the following folders could be returned:
|
|
|
|
macOS (non-XDG):
|
|
``~/Library/Application Support/My App``
|
|
Mac OS X (XDG):
|
|
``~/.config/my-app``
|
|
Unix:
|
|
``~/.config/my-app``
|
|
Windows 7 (roaming):
|
|
``C:\\Users\\<user>\\AppData\\Roaming\\Acme\\My App``
|
|
Windows 7 (not roaming):
|
|
``C:\\Users\\<user>\\AppData\\Local\\Acme\\My App``
|
|
|
|
:param app_name: the application name. This should be properly capitalized
|
|
and can contain whitespace.
|
|
:param app_author: The app author's name (or company). This should be
|
|
properly capitalized and can contain whitespace.
|
|
:param roaming: controls if the folder should be roaming or not on Windows.
|
|
Has no effect on non-Windows systems.
|
|
:param force_xdg: if this is set to `True`, then on macOS the XDG Base
|
|
Directory Specification will be followed. Has no effect
|
|
on non-macOS systems.
|
|
|
|
"""
|
|
if WIN:
|
|
key = "APPDATA" if roaming else "LOCALAPPDATA"
|
|
folder = os.path.expanduser(os.environ.get(key, "~"))
|
|
return os.path.join(folder, app_author, app_name)
|
|
if MAC and not force_xdg:
|
|
return os.path.join(
|
|
os.path.expanduser("~/Library/Application Support"), app_name
|
|
)
|
|
return os.path.join(
|
|
os.path.expanduser(os.environ.get("XDG_CONFIG_HOME", "~/.config")),
|
|
_pathify(app_name),
|
|
)
|
|
|
|
|
|
def get_system_config_dirs(app_name, app_author, force_xdg=True):
|
|
r"""Returns a list of system-wide config folders for the application.
|
|
|
|
For an example application called ``"My App"`` by ``"Acme"``,
|
|
something like the following folders could be returned:
|
|
|
|
macOS (non-XDG):
|
|
``['/Library/Application Support/My App']``
|
|
Mac OS X (XDG):
|
|
``['/etc/xdg/my-app']``
|
|
Unix:
|
|
``['/etc/xdg/my-app']``
|
|
Windows 7:
|
|
``['C:\ProgramData\Acme\My App']``
|
|
|
|
:param app_name: the application name. This should be properly capitalized
|
|
and can contain whitespace.
|
|
:param app_author: The app author's name (or company). This should be
|
|
properly capitalized and can contain whitespace.
|
|
:param force_xdg: if this is set to `True`, then on macOS the XDG Base
|
|
Directory Specification will be followed. Has no effect
|
|
on non-macOS systems.
|
|
|
|
"""
|
|
if WIN:
|
|
folder = os.environ.get("PROGRAMDATA")
|
|
return [os.path.join(folder, app_author, app_name)]
|
|
if MAC and not force_xdg:
|
|
return [os.path.join("/Library/Application Support", app_name)]
|
|
dirs = os.environ.get("XDG_CONFIG_DIRS", "/etc/xdg")
|
|
paths = [os.path.expanduser(x) for x in dirs.split(os.pathsep)]
|
|
return [os.path.join(d, _pathify(app_name)) for d in paths]
|
|
|
|
|
|
def _pathify(s):
|
|
"""Convert spaces to hyphens and lowercase a string."""
|
|
return "-".join(s.split()).lower()
|