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Command-line and common processing for Docutils front-end tools.
Exports the following classes:
* `OptionParser`: Standard Docutils command-line processing.
* `Option`: Customized version of `optparse.Option`; validation support.
* `Values`: Runtime settings; objects are simple structs
(``object.attribute``). Supports cumulative list settings (attributes).
* `ConfigParser`: Standard Docutils config file processing.
Also exports the following functions:
* Option callbacks: `store_multiple`, `read_config_file`.
* Setting validators: `validate_encoding`,
`validate_encoding_error_handler`,
`validate_encoding_and_error_handler`,
`validate_boolean`, `validate_ternary`, `validate_threshold`,
`validate_colon_separated_list`,
`validate_comma_separated_list`,
`validate_dependency_file`.
* `make_paths_absolute`.
* SettingSpec manipulation: `filter_settings_spec`.
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Store multiple values in `parser.values`. (Option callback.)
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Read a configuration file during option processing. (Option callback.)
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Call the validator function and implement overrides on all applicable
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Transform '-' to '_' so the cmdline form of option names can be used.
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