Coverage for .tox/cov/lib/python3.11/site-packages/confattr/quickstart.py: 100%

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1#!./runmodule.sh 

2 

3''' 

4Importing this module defines several settings which are useful in many applications and provides the :class:`~confattr.quickstart.ConfigManager` class. 

5This allows for an easy configuration setup in exchange for flexibility. 

6If you want more flexibility you can either subclass :class:`~confattr.quickstart.ConfigManager` and override specific methods or you do not import this module at all and use :class:`~confattr.configfile.ConfigFile` and :class:`~confattr.config.Config` directly. 

7''' 

8 

9import sys 

10import argparse 

11from collections.abc import Callable 

12 

13from . import Config, ConfigFile, UiNotifier, Message, NotificationLevel 

14from .types import SubprocessCommandWithAlternatives as Command, OptionalExistingDirectory, TYPE_CONTEXT 

15from .utils import CallAction, HelpFormatter 

16from .configfile import Include 

17 

18 

19Include.home = Config('include.home', OptionalExistingDirectory(''), help="The directory where the include command looks for relative paths. An empty string is the default, the directory where the config file is located.") 

20 

21class ConfigManager: 

22 

23 #: A setting allowing the user to specify how to open text files, e.g. the config file 

24 editor = Config('editor', Command.editor(visual=False), help="The editor to be used when opening the config file") 

25 

26 #: A setting allowing the user to specify which messages they want to see when loading a config file with :meth:`~confattr.quickstart.ConfigManager.load` 

27 notification_level_config = Config('notification-level.config-file', NotificationLevel.ERROR) 

28 

29 #: A setting allowing the user to specify which messages they want to see when parsing a line with :meth:`~confattr.quickstart.ConfigManager.parse_line` 

30 notification_level_ui = Config('notification-level.user-interface', NotificationLevel.INFO) 

31 

32 #: Can be used to print messages to the user interface, uses :attr:`~confattr.quickstart.ConfigManager.notification_level_ui` 

33 ui_notifier: UiNotifier 

34 

35 def __init__(self, appname: str, version: str, doc: 'str|None') -> None: 

36 ''' 

37 Defines two :class:`~confattr.configfile.ConfigFile` instances with separately configurable notification levels for :meth:`~confattr.quickstart.ConfigManager.load` and :meth:`~confattr.quickstart.ConfigManager.parse_line`. 

38 This object also provides :meth:`~confattr.quickstart.ConfigManager.create_argument_parser` to create an :class:`argparse.ArgumentParser` with commonly needed arguments. 

39 Note that all :class:`~confattr.config.Config` instances must be created before instantiating this class. 

40 

41 :param appname: The name of the app, used to initialize :class:`~confattr.configfile.ConfigFile` and when printing the version number 

42 :param version: The version of the app, used when printing the version number 

43 :param doc: The package doc string, used as description when creating an :class:`~argparse.ArgumentParser` 

44 ''' 

45 self.appname = appname 

46 self.version = version 

47 self.doc = doc 

48 

49 self.config_file = ConfigFile(appname=appname, notification_level=type(self).notification_level_config) 

50 self.user_interface = ConfigFile(appname=appname, notification_level=type(self).notification_level_ui, show_line_always=False) 

51 self.user_interface.command_dict['include'].config_file = self.config_file 

52 self.ui_notifier = self.user_interface.ui_notifier 

53 

54 def set_ui_callback(self, callback: 'Callable[[Message], None]') -> None: 

55 ''' 

56 Register a user interface notification callback function to all :class:`~confattr.configfile.ConfigFile` instances created by this object. 

57 

58 See :meth:`ConfigFile.set_ui_callback() <confattr.configfile.ConfigFile.set_ui_callback>`. 

59 ''' 

60 self.config_file.set_ui_callback(callback) 

61 self.user_interface.set_ui_callback(callback) 

62 

63 def print_errors_without_ui(self) -> None: 

64 ''' 

65 Call :meth:`~confattr.quickstart.ConfigManager.set_ui_callback` with :func:`print` so that all messages are printed to the terminal. 

66 ''' 

67 self.set_ui_callback(print) 

68 

69 

70 # ------- config file ------- 

71 

72 def load(self) -> bool: 

73 ''' 

74 Load settings from config file and environment variables. 

75 

76 :return: true if no errors have occurred, false if one or more errors have occurred 

77 ''' 

78 return self.config_file.load() 

79 

80 def parse_line(self, ln: str) -> bool: 

81 ''' 

82 Parse a line from the user interface. 

83 

84 :return: true if no errors have occurred, false if one or more errors have occurred 

85 ''' 

86 return self.user_interface.parse_line(ln) 

87 

88 def edit_config(self, *, context: TYPE_CONTEXT, update: bool = False) -> None: 

89 ''' 

90 Open the config file in a text editor. 

91 

92 If the config file does not exist it is created first. 

93 The text editor can be configured with :attr:`~confattr.quickstart.ConfigManager.editor`. 

94 

95 :param context: Returns a context manager which can be used to stop and start an urwid screen. 

96 It takes the command to be executed as argument so that it can log the command 

97 and it returns the command to be executed so that it can modify the command, 

98 e.g. processing and intercepting some environment variables. 

99 :param update: Load and rewrite the config file if it is already existing. 

100 ''' 

101 if update: 

102 self.config_file.load() 

103 self.editor \ 

104 .replace(Command.WC_FILE_NAME, self.config_file.save(if_not_existing=not update)) \ 

105 .run(context=context) 

106 self.config_file.load() 

107 

108 def get_save_path(self) -> str: 

109 ''' 

110 :return: The first existing and writable file returned by :meth:`~confattr.configfile.ConfigFile.iter_config_paths` or the first path if none of the files are existing and writable. 

111 ''' 

112 return self.config_file.get_save_path() 

113 

114 def save(self, if_not_existing: bool = False) -> str: 

115 ''' 

116 Save the current values of all settings to the file returned by :meth:`~confattr.configfile.ConfigFile.get_save_path`. 

117 Directories are created as necessary. 

118 

119 :param if_not_existing: Do not overwrite the file if it is already existing. 

120 :return: The path to the file which has been written 

121 ''' 

122 

123 return self.config_file.save(if_not_existing=if_not_existing) 

124 

125 

126 # ------- creating an argument parser ------- 

127 

128 def create_argument_parser(self) -> argparse.ArgumentParser: 

129 ''' 

130 Create an :class:`argparse.ArgumentParser` with arguments to display the version, edit the config file and choose a config file 

131 by calling :meth:`~confattr.quickstart.ConfigManager.create_empty_argument_parser`, :meth:`~confattr.quickstart.ConfigManager.add_version_argument` and :meth:`~confattr.quickstart.ConfigManager.add_config_related_arguments`. 

132 ''' 

133 p = self.create_empty_argument_parser() 

134 self.add_version_argument(p) 

135 self.add_config_related_arguments(p) 

136 return p 

137 

138 def create_empty_argument_parser(self) -> argparse.ArgumentParser: 

139 ''' 

140 Create an :class:`argparse.ArgumentParser` with the :paramref:`~confattr.quickstart.ConfigManager.doc` passed to the constructor as description and :class:`~confattr.utils.HelpFormatter` as formatter_class but without custom arguments. 

141 ''' 

142 return argparse.ArgumentParser(description=self.doc, formatter_class=HelpFormatter) 

143 

144 def add_version_argument(self, p: argparse.ArgumentParser) -> argparse.ArgumentParser: 

145 ''' 

146 Add an argument to print the version and exit to an :class:`argparse.ArgumentParser`. 

147 

148 :return: The same object that has been passed in 

149 ''' 

150 p.add_argument('-v', '--version', action=CallAction, callback=self.print_version_and_exit) 

151 return p 

152 

153 def add_config_related_arguments(self, p: argparse.ArgumentParser) -> argparse.ArgumentParser: 

154 ''' 

155 Add arguments related to the config file to an :class:`argparse.ArgumentParser`. 

156 

157 :return: The same object that has been passed in 

158 ''' 

159 p.add_argument('-e', '--edit-config', action=CallAction, callback=self.edit_config_and_exit) 

160 p.add_argument('-E', '--update-and-edit-config', action=CallAction, callback=self.update_config_and_exit) 

161 p.add_argument('-c', '--config', action=CallAction, callback=self.select_config_file, nargs=1) 

162 return p 

163 

164 

165 # ------- argument parser option callbacks ------- 

166 

167 def print_version_and_exit(self) -> None: 

168 '''show the version and exit''' 

169 print("%s %s" % (self.appname, self.version)) 

170 sys.exit() 

171 

172 def edit_config_and_exit(self) -> None: 

173 '''edit the config file and exit''' 

174 self.edit_config(context=None, update=False) 

175 self.print_errors_without_ui() 

176 sys.exit() 

177 

178 def update_config_and_exit(self) -> None: 

179 '''rewrite the config file, open it for editing and exit''' 

180 self.edit_config(context=None, update=True) 

181 self.print_errors_without_ui() 

182 sys.exit() 

183 

184 def select_config_file(self, path: str) -> None: 

185 '''use this config file instead of the default''' 

186 ConfigFile.config_path = path