Allow for --no-foo as alternative to --/foo

[lizmat]

By setting the new "allow-no" flag in %*SUB-MAIN-OPTS:

$ raku -r 'sub MAIN(|c) { say c }; my %*SUB-MAIN-OPTS=:allow-no' --no-foo
(:foo(Bool::False))

as opposed to:

$ raku -r 'sub MAIN(|c) { say c }' --no-foo
(:no-foo(Bool::True))

[jnthn]

Seems safe given it's opt-in, and a common enough convention to offer it out of the box.

[Leont]

Over time, the built-in argument parser is getting more and more into line with Getopt::Long 🙂

[lizmat]

Is that a documented feature of Getopt::Long? I couldn't find it in the docs, but then again I may have not looked closely enough

[Leont]

Is that a documented feature of Getopt::Long? I couldn't find it in the docs, but then again I may have not looked closely enough

All arguments marked as negatable have a --no-*. It can be done by giving a Bool a default value or using is option('!')