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https://github.com/clap-rs/clap
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32b5520ff1
mitsuhiko immediately jumped into the examples and got tripped up by the lack of documentation on feature flags needed. I limited this to just the root ones because the rest are in a more proper tutorial that steps through it all.
27 lines
641 B
Markdown
27 lines
641 B
Markdown
*Jump to [source](keyvalue_derive.rs)*
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**This requires enabling the `derive` feature flag.**
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```bash
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$ keyvalue_derive --help
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clap
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USAGE:
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keyvalue_derive[EXE] [OPTIONS]
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OPTIONS:
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-D <DEFINES>
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-h, --help Print help information
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$ keyvalue_derive -D Foo=10 -D Alice=30
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Args { defines: [("Foo", 10), ("Alice", 30)] }
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$ keyvalue_derive -D Foo
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? failed
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error: Invalid value for '-D <DEFINES>': invalid KEY=value: no `=` found in `Foo`
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For more information try --help
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$ keyvalue_derive -D Foo=Bar
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? failed
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error: Invalid value for '-D <DEFINES>': invalid digit found in string
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For more information try --help
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```
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