1.8 KiB
Collection of examples "how to use clap_derive"
Help on the bottom
How to append a postscript to the help message generated.
Arg Enum
How to use ArgEnum
At least N
How to require presence of at least N values, like val1 val2 ... valN ... valM.
Basic
A basic example how to use clap_derive.
Deny missing docs
This is not an example but a test, it should be moved to tests folder
as soon as this is fixed (if ever).
Doc comments
How to use doc comments in place of help/long_help.
Arguments of subcommands in separate struct
How to extract subcommands' args into external structs.
Environment variables
How to use environment variable fallback an how it interacts with default_value.
Advanced
Somewhat complex example of usage of clap_derive.
Flatten
How to use #[clap(flatten)]
Git
Pseudo-git example, shows how to use subcommands and how to document them.
Groups
Using clap::Arg::group with clap.
key=value pairs
How to parse key=value pairs.
--no-* flags
How to add no-thing flag which is true by default and false if passed.
Rename all
How #[clap(rename_all)] works.
Skip
How to use #[clap(skip)].
Aliases
How to use aliases
true or false
How to express ""true" or "false" argument.
Author, description, and version from Cargo.toml
How to derive a author, description, and version from Cargo.toml