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import imp
import os
import re
import ast
import json
import mailcap
import codecs
import logging
from collections import OrderedDict
from ConfigParser import SafeConfigParser, ParsingError, NoOptionError
class FallbackConfigParser(SafeConfigParser):
""":class:`~ConfigParser.SafeConfigParser` that allows fallback values"""
def __init__(self):
SafeConfigParser.__init__(self)
self.optionxform = lambda x: x
def get(self, section, option, fallback=None, *args, **kwargs):
"""get a config option
:param section: section name
:type section: str
:param option: option key
:type option: str
:param fallback: the value to fall back if option undefined
:type fallback: str
"""
if SafeConfigParser.has_option(self, section, option):
return SafeConfigParser.get(self, section, option, *args, **kwargs)
elif fallback != None:
return fallback
else:
raise NoOptionError(option, section)
def getstringlist(self, section, option, **kwargs):
"""directly parses a config value into a list of strings"""
stringlist = list()
if self.has_option(section, option):
value = self.get(section, option, **kwargs)
stringlist = [s.strip() for s in value.split(',') if s.strip()]
return stringlist
class AlotConfigParser(FallbackConfigParser):
""":class:`FallbackConfigParser` for alots config."""
def __init__(self):
FallbackConfigParser.__init__(self)
self.hooks = None
def get_hook(self, key):
"""return hook (`callable`) identified by `key`"""
if self.hooks:
if key in self.hooks.__dict__:
return self.hooks.__dict__[key]
return None
def read(self, file):
if not os.path.isfile(file):
return
SafeConfigParser.readfp(self, codecs.open(file, "r", "utf8"))
if self.has_option('general', 'hooksfile'):
hf = os.path.expanduser(self.get('general', 'hooksfile'))
if hf is not None:
try:
self.hooks = imp.load_source('hooks', hf)
except:
logging.debug('unable to load hooks file:%s' % hf)
# fix quoted keys / values
for section in self.sections():
for key, value in self.items(section):
if value and value[0] in "\"'":
value = ast.literal_eval(value)
transformed_key = False
if key[0] in "\"'":
transformed_key = ast.literal_eval(key)
elif key == 'colon':
transformed_key = ':'
if transformed_key:
self.remove_option(section, key)
self.set(section, transformed_key, value)
else:
self.set(section, key, value)
# parse highlighting rules
self._highlighting_rules = self._parse_highlighting_rules()
def get_palette(self):
"""parse the sections '1c-theme', '16c-theme' and '256c-theme'
into an urwid compatible colour palette.
:returns: a palette
:rtype: list
"""
mode = self.getint('general', 'colourmode')
ms = "%dc-theme" % mode
names = self.options(ms)
if mode != 1: # truncate '_fg'/'_bg' suffixes for multi-colour themes
names = set([s[:-3] for s in names])
p = list()
for attr in names:
nf = self._get_themeing_option('16c-theme', attr + '_fg')
nb = self._get_themeing_option('16c-theme', attr + '_bg')
m = self._get_themeing_option('1c-theme', attr)
hf = self._get_themeing_option('256c-theme', attr + '_fg')
hb = self._get_themeing_option('256c-theme', attr + '_bg')
p.append((attr, nf, nb, m, hf, hb))
if attr.startswith('tag_') and attr + '_focus' not in names:
nb = self.get('16c-theme', 'tag_focus_bg',
fallback='default')
hb = self.get('256c-theme', 'tag_focus_bg',
fallback='default')
p.append((attr + '_focus', nf, nb, m, hf, hb))
return p
def _get_themeing_option(self, section, option, default='default'):
"""
Retrieve the value of the given option from the given section of the
config file.
If the option does not exist, try its parent options before falling
back to the specified default. The parent of an option is the name of
the option itself minus the last section enclosed in underscores;
so the parent of the option `aaa_bbb_ccc_fg` is of the form
`aaa_bbb_fg`.
:param section: the section of the config file to search for the given
option
:type section: string
:param option: the option to lookup
:type option: string
:param default: the value that is to be returned if neither the
requested option nor a parent exists
:type default: string
:return: the value of the given option, or the specified default
:rtype: string
"""
result = ''
if 'focus' in option:
parent_option_re = '(.+)_[^_]+_(focus_(?:fg|bg))'
else:
parent_option_re = '(.+)_[^_]+_(fg|bg)'
if self.has_option(section, option):
result = self.get(section, option)
else:
has_parent_option = re.search(parent_option_re, option)
if has_parent_option:
parent_option = '{0}_{1}'.format(has_parent_option.group(1),
has_parent_option.group(2))
result = self._get_themeing_option(section, parent_option)
else:
result = default
return result
def has_themeing(self, themeing):
"""
Return true if the given themeing option exists in the current colour
theme.
:param themeing: The themeing option to check for
:type theming: string
:return: True if themeing exist, False otherwise
:rtype: bool
"""
mode = self.getint('general', 'colourmode')
theme = '{colours}c-theme'.format(colours=mode)
has_fg = self.has_option(theme, themeing + '_fg')
has_bg = self.has_option(theme, themeing + '_bg')
return (has_fg or has_bg)
def _parse_highlighting_rules(self):
"""
Parse the highlighting rules from the config file.
:returns: The highlighting rules
:rtype: :py:class:`collections.OrderedDict`
"""
rules = OrderedDict()
config_string = self.get('highlighting', 'rules')
try:
rules = json.loads(config_string, object_pairs_hook=OrderedDict)
except ValueError as err:
raise ParsingError("Could not parse config option" \
" 'rules' in section 'highlighting':" \
" {reason}".format(reason=err))
return rules
def get_highlight_rules(self):
"""
Getter for the highlighting rules.
:returns: The highlighting rules
:rtype: :py:class:`collections.OrderedDict`
"""
return self._highlighting_rules
def get_tag_theme(self, tag, focus=False, highlight=''):
"""
look up attribute string to use for a given tagstring
:param tag: tagstring to look up
:type tag: str
:param focus: return the 'focussed' attribute
:type focus: bool
:param highlight: suffix of highlight theme
:type highlight: str
"""
themes = self._select_tag_themes(tag, focus, highlight)
selected_theme = themes[-1]
for theme in themes:
if self.has_themeing(theme):
selected_theme = theme
break
return selected_theme
def _select_tag_themes(self, tag, focus=False, highlight=''):
"""
Select tag themes based on tag name, focus and highlighting.
:param tag: the name of the tag to theme
:type tag: str
:param focus: True if this tag is focussed, False otherwise
:type focus: bool
:param highlight: the suffix of the highlighting theme
:type highlight: str
:return: the selected themes, highest priority first
:rtype: list
"""
base = 'tag'
themes = [base, base + '_{}'.format(tag)]
if (highlight and
'tags' in self.getstringlist('highlighting', 'components')):
themes.insert(1, base + '_{}'.format(highlight))
themes.insert(3, base + '_{}_{}'.format(tag, highlight))
if focus:
themes = [theme + '_focus' for theme in themes]
themes.reverse()
return themes
def has_theming(self, themeing):
"""
Return true if the given themeing option exists in the current colour
theme.
:param themeing: The themeing option to check for
:type theming: string
:return: True if themeing exist, False otherwise
:rtype: bool
"""
mode = self.getint('general', 'colourmode')
theme = '{colours}c-theme'.format(colours=mode)
has_fg = self.has_option(theme, themeing + '_fg')
has_bg = self.has_option(theme, themeing + '_bg')
return (has_fg or has_bg)
def get_mapping(self, mode, key):
"""look up keybinding from `MODE-maps` sections
:param mode: mode identifier
:type mode: str
:param key: urwid-style key identifier
:type key: str
:returns: a command line to be applied upon keypress
:rtype: str
"""
cmdline = None
if self.has_option(mode + '-maps', key):
cmdline = self.get(mode + '-maps', key)
elif self.has_option('global-maps', key):
cmdline = self.get('global-maps', key)
return cmdline
config = AlotConfigParser()
config.read(os.path.join(os.path.dirname(__file__), 'defaults', 'alot.rc'))
notmuchconfig = FallbackConfigParser()
notmuchconfig.read(os.path.join(os.path.dirname(__file__),
'defaults',
'notmuch.rc'))
mailcaps = mailcap.getcaps()
def get_mime_handler(mime_type, key='view', interactive=True):
"""
get shellcomand defined in the users `mailcap` as handler for files of
given `mime_type`.
:param mime_type: file type
:type mime_type: str
:param key: identifies one of possibly many commands for this type by
naming the intended usage, e.g. 'edit' or 'view'. Defaults
to 'view'.
:type key: str
:param interactive: choose the "interactive session" handler rather than
the "print to stdout and immediately return" handler
:type interactive: bool
"""
if interactive:
mc_tuple = mailcap.findmatch(mailcaps,
mime_type,
key=key)
else:
mc_tuple = mailcap.findmatch(mailcaps,
mime_type,
key='copiousoutput')
if mc_tuple:
if mc_tuple[1]:
return mc_tuple[1][key]
else:
return None
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