Enum variants

[remimimimimi]

How can I do so that when user entering the wrong architecture, cargo-make print list of supported architectures like this

[sagiegurari]

I'll need more details to fully understand.
so your user flow is including adding the target as a cli arg?
so your task looks like?

[tasks.build]
command = "cargo"
args = [  "build",  "--target",  "${@}"]

in which case, if the target is invalid, you should see same printout.

[remimimimimi]

User can give one of suggested targets as cli argument after --target or build system will use default variant if it is declared.
As example if user input will be cargo build --target alsdkjfasbgq can cargo-make show possible variants of defined enum or use default value.
How or can I declare enumeration of possible variants for argument? If I can then would cargo-make print possible variants in wrong case if default variant undefined?

[sagiegurari]

i really need help on what you really want to do? is this some flow which build is part of it and such?
cargo-make can run scripts, so you can parse output of cargo targets and do something with it, but it won't be simple or 'nice'.
i think if users put wrong target, cargo will already print it for them so it should be good enough.

[sagiegurari]

basically use the example i gave you

[remimimimimi]

I wonder if there is a system that limits the possible arguments, like Rust enums. In other words, if user input does not match valid values, the program throws an error and prints out the possible values for this argument.

Cargo allows builds for all supported targets(user can build the core library if there no prebuild binaries), so if he wants to know the list of supported targets he needs to look elsewhere in the project's documentation

[sagiegurari]

you could limit or more like, validate user input using duckscript for example, where you check the args for specific value list.
not sure however, that its so amazing. because at the end, cargo will do it for you anyway.