Help: Stuck at clap v3 to v4 transition

[ayushbindlish]

Hi All,

I am trying to upgrade this code which was using structopt. I have been able to upgrade to clap v3 but I am stuck at v4 transition.

What I would like to understand is how can I upgrade the following line to use clap v4?

#[clap(parse(from_os_str), long, required = true, multiple = true)]

clap version:
clap = { version = "3.2.25", features = ["derive"] }

TIA

[epage]

In the changelog is a migration guide which suggests enabling deprecations before upgrading. This should give suggestions on how to update that line and it should be runnable in clap v3 so you can decouple and verify those changes separate from the upgrade.

As a quick overview, the parse system was replaced with value_parser system and the derive has some smarts to infer the right behavior in more case.

v3.0.0 split multiple into multiple_occurences and multiple_values. Generally, you'll want multiple_occurences. multiple_occurences was reworked into an ‘ArgActionsystem and so you'd wantaction = ArgAction::Append`.