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https://github.com/clap-rs/clap
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82 lines
1.9 KiB
Markdown
82 lines
1.9 KiB
Markdown
# Collection of examples "how to use `clap_derive`"
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### [Help on the bottom](after_help.rs)
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How to append a postscript to the help message generated.
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### [Arg Enum](arg_enum.rs)
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How to use `ArgEnum`
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### [At least N](at_least_two.rs)
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How to require presence of at least N values, like `val1 val2 ... valN ... valM`.
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### [Basic](basic.rs)
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A basic example how to use `clap_derive`.
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### [Deny missing docs](deny_missing_docs.rs)
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**This is not an example but a test**, it should be moved to `tests` folder
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as soon as [this](https://github.com/rust-lang/rust/issues/24584) is fixed (if ever).
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### [Doc comments](doc_comments.rs)
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How to use doc comments in place of `help/long_help`.
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### [Arguments of subcommands in separate `struct`](enum_tuple.rs)
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How to extract subcommands' args into external structs.
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### [Environment variables](env.rs)
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How to use environment variable fallback an how it interacts with `default_value`.
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### [Advanced](example.rs)
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Somewhat complex example of usage of `clap_derive`.
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### [Flatten](flatten.rs)
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How to use `#[clap(flatten)]`
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### [Git](git.rs)
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Pseudo-`git` example, shows how to use subcommands and how to document them.
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### [Groups](group.rs)
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Using `clap::Arg::group` with `clap`.
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### [`key=value` pairs](keyvalue.rs)
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How to parse `key=value` pairs.
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### [`--no-*` flags](negative_flag.rs)
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How to add `no-thing` flag which is `true` by default and `false` if passed.
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### [Rename all](rename_all.rs)
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How `#[clap(rename_all)]` works.
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### [Skip](skip.rs)
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How to use `#[clap(skip)]`.
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### [Aliases](subcommand_aliases.rs)
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How to use aliases
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### [`true` or `false`](true_or_false.rs)
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How to express "`"true"` or `"false"` argument.
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### [Author, description, and version from `Cargo.toml`](from_crate.rs)
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How to derive the author, description, and version from Cargo.toml
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### [Value hints for shell completion](value_hints_derive.rs)
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How to provide `ValueHint` attributes and generate shell completion files.
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