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CLI::Version - add -V / --version parameters to your script


proto sub MAIN(|) {*}

# alternately:
use CLI::Version $?DISTRIBUTION, proto sub MAIN(|) {*}

# only allow --version
use CLI::Version $?DISTRIBUTION, proto sub MAIN(|) {*}, "long-only";


CLI::Version adds a multi sub candidate to the &MAIN function in your script, that will trigger if the script is called with -V or --version arguments only.

For instance, in the App::Rak distribution, which provides a rak CLI, calling rak -V will result in something like:

    $ rak -V
    rak - provided by App::Rak 0.0.3, running Raku 6.d on Rakudo 2022.06.

If the candidate is triggered, it will exit with the default value for exit (which is usually 0).

If you would also like to see the description of the module, you can add --verbose as an argument: then you get something like:

    $ rak -V --verbose
    rak - a CLI for searching strings in files.
    Provided by App::Rak 0.0.3, running Raku 6.d with Rakudo 2022.06.27.

By specifying a true value as the 3rd argument in the use statement, will cause only --version to trigger the candidate.


Due to the fact that the $?DISTRIBUTION and &MAIN of the code that uses this module, can not be obtained by a public API, it is necessary to provide them in the use statement. This need may disappear in future versions of the Raku Programming Language.


Elizabeth Mattijsen liz@raku.rocks

Source can be located at: https://github.com/lizmat/CLI-Version . Comments and Pull Requests are welcome.

If you like this module, or what I’m doing more generally, committing to a small sponsorship would mean a great deal to me!


Copyright 2022 Elizabeth Mattijsen

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.