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clap/examples/multicall_busybox.md
Ed Page befee6667b docs: Re-work examples 
This creates distinct tutorial examples from complex feature examples
(more how-tos).  Both sets are getting builder / derive versions (at
least the critical ones).
2021-11-30 21:33:52 -06:00

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Example of a busybox-style multicall program

See the documentation for clap::AppSettings::Multicall for rationale.

This example omits every command except true and false, which are the most trivial to implement,

$ busybox true
? 0
$ busybox false
? 1

Note: without the links setup, we can't demonostrate the multicall behavior

But includes the --install option as an example of why it can be useful for the main program to take arguments that aren't applet subcommands.

$ busybox --install
? failed
...

Though users must pass something:

$ busybox
? failed
busybox 

USAGE:
    busybox[EXE] [OPTIONS] [SUBCOMMAND]

OPTIONS:
    -h, --help                 Print help information
        --install <install>    Install hardlinks for all subcommands in path

SUBCOMMANDS:
    false    does nothing unsuccessfully
    help     Print this message or the help of the given subcommand(s)
    true     does nothing successfully