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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.
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This requires enabling the derive feature flag.
Git is an example of several common subcommand patterns.
Help:
$ git_derive
? failed
git
A fictional versioning CLI
USAGE:
git_derive[EXE] <SUBCOMMAND>
OPTIONS:
-h, --help Print help information
SUBCOMMANDS:
add adds things
clone Clones repos
help Print this message or the help of the given subcommand(s)
push pushes things
$ git_derive help
git
A fictional versioning CLI
USAGE:
git_derive[EXE] <SUBCOMMAND>
OPTIONS:
-h, --help Print help information
SUBCOMMANDS:
add adds things
clone Clones repos
help Print this message or the help of the given subcommand(s)
push pushes things
$ git_derive help add
git_derive[EXE]-add
adds things
USAGE:
git_derive[EXE] add <PATH>...
ARGS:
<PATH>... Stuff to add
OPTIONS:
-h, --help Print help information
A basic argument:
$ git_derive add
? failed
git_derive[EXE]-add
adds things
USAGE:
git_derive[EXE] add <PATH>...
ARGS:
<PATH>... Stuff to add
OPTIONS:
-h, --help Print help information
$ git_derive add Cargo.toml Cargo.lock
Adding ["Cargo.toml", "Cargo.lock"]
External subcommands:
$ git_derive custom-tool arg1 --foo bar
Calling out to "custom-tool" with ["arg1", "--foo", "bar"]