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from __future__ import absolute_import, unicode_literals, print_function

import os

import json

from copy import deepcopy

from collections import defaultdict

import sublime

import sublime_plugin

class Settings(object):

"""This class provides global access to and management of plugin settings."""

nested_settings = ()

def __init__(self, name):

"""Initialize a new instance."""

self.name = name

self.settings = {}

self.previous_settings = {}

self.changeset = set()

self.plugin_settings = None

self.edits = defaultdict(list)

def load(self, force=False):

"""Load the plugin settings."""

if force or not self.settings:

self.observe()

self.on_change()

def has_setting(self, setting):

"""Return whether the given setting exists."""

return setting in self.settings

def get(self, setting, default=None):

"""Return a plugin setting, defaulting to default if not found."""

return self.settings.get(setting, default)

def set(self, setting, value, changed=False):

"""

Set a plugin setting to the given value.

Clients of this module should always call this method to set a value

instead of doing settings['foo'] = 'bar'.

If the caller knows for certain that the value has changed,

they should pass changed=True.

"""

self.copy()

self.settings[setting] = value

if changed:

self.changeset.add(setting)

def pop(self, setting, default=None):

"""

Remove a given setting and return default if it is not in self.settings.

Clients of this module should always call this method to pop a value

instead of doing settings.pop('foo').

"""

self.copy()

return self.settings.pop(setting, default)

def copy(self):

"""Save a copy of the plugin settings."""

self.previous_settings = deepcopy(self.settings)

def observe(self, observer=None):

"""Observer changes to the plugin settings."""

self.plugin_settings = sublime.load_settings('{}.sublime-settings'.format(self.name))

self.plugin_settings.clear_on_change(self.name)

self.plugin_settings.add_on_change(self.name, observer or self.on_change)

def merge_user_settings(self, settings):

"""

Return the default settings merged with the user's settings.

If there are any nested settings, those get merged as well.

"""

default = settings.get('default', {})

user = settings.get('user', {})

if user:

for setting_name in self.nested_settings:

default_setting = default.pop(setting_name, {})

user_setting = user.get(setting_name, {})

for name, data in user_setting.items():

if name in default_setting and isinstance(default_setting[name], dict):

default_setting[name].update(data)

else:

default_setting[name] = data

default[setting_name] = default_setting

user.pop(setting_name, None)

default.update(user)

return default

def on_change(self):

"""Update state when the user settings change."""

settings = self.merge_user_settings(self.plugin_settings)

self.settings.clear()

self.settings.update(settings)

self.on_update()

self.changeset.clear()

self.copy()

def on_update(self):

"""To be implemented by the user, when needed."""

pass

def save(self, view=None):

"""

Regenerate and save the user settings.

User settings are updated and merged with the default settings and if

the user settings are currently being edited, the view is also updated.

"""

self.load()

# Fill in default settings

settings = self.settings

settings_filename = '{}.sublime-settings'.format(self.name)

user_settings_path = os.path.join(sublime.packages_path(), 'User', settings_filename)

settings_views = []

if view is None:

# See if any open views are the user prefs

for window in sublime.windows():

for view in window.views():

if view.file_name() == user_settings_path:

settings_views.append(view)

else:

settings_views = [view]

if settings_views:

def replace(edit):

if not view.is_dirty():

j = json.dumps({'user': settings}, indent=4, sort_keys=True)

j = j.replace(' \n', '\n')

view.replace(edit, sublime.Region(0, view.size()), j)

for view in settings_views:

self.edits[view.id()].append(replace)

view.run_command('settings_view_editor', self)

view.run_command('save')

else:

user_settings = sublime.load_settings(settings_filename)

user_settings.set('user', settings)

sublime.save_settings(settings_filename)

def edit(self, vid, edit):

"""Perform an operation on a view with the given edit object."""

callbacks = self.edits.pop(vid, [])

for c in callbacks:

c(edit)

class SettingsViewEditorCommand(sublime_plugin.TextCommand):

"""A plugin command used to generate an edit object for a view."""

def run(self, edit, settings):

"""Run the command."""

settings.edit(self.view.id(), edit)

class SettingTogglerCommandMixin(object):

"""Command that toggles a setting."""

settings = None

def is_visible(self, **args):

"""Return True if the opposite of the setting is True."""

if args.get('checked', False):

return True

if self.settings.has_setting(args['setting']):

setting = self.settings.get(args['setting'], None)

return setting is not None and setting is not args['value']

else:

return args['value'] is not None

def is_checked(self, **args):

"""Return True if the setting should be checked."""

if args.get('checked', False):

setting = self.settings.get(args['setting'], False)

return setting is True

else:

return False

def run(self, **args):

"""Toggle the setting if value is boolean, or remove it if None."""

if 'value' in args:

if args['value'] is None:

self.settings.pop(args['setting'])

else:

self.settings.set(args['setting'], args['value'], changed=True)

else:

setting = self.settings.get(args['setting'], False)

self.settings.set(args['setting'], not setting, changed=True)

self.settings.save()

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