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In some sophisticated situations, these may be expensive to calculate. One example might be a '--branch' option accepting any single Git branch that exists on the remote -- in such a case, the remote would need to be queried for all possible_values. The cost is ultimately unavoidable at runtime since this validation has to happen eventually, but there's no need to pay it when generating help text if `is_hide_possible_values_set`. To keep '-h' fast, avoid collecting `possible_values` during '-h' unless we're actually going to use the values in display. This optimization is repeated for the manpage renderer. This is trivially based on the short-circuiting logic at [1], which at least supports the idea that actually consuming the iterator is not generally-guaranteed behavior when `hide_possible_values` is set. Note on the 'expensive' mod: This keeps all the possible_values tests in one file but allows the entire set of tests to be controlled by the 'strings' feature (which is required to be able to use String rather than str for each possible value). [1]: clap_builder/src/builder/command.rs:long_help_exists_ |
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clap_builder
Builder implementation for clap.
License
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
See CONTRIBUTING for more details.