add a flag to `cargo add` to make it show all features

[yshui]

Problem

Currently when a crate has too many features, cargo add only shows part of them and prints "X deactivated features". this is useful if i want to see a concise summary, but sometimes i actually want to see all the available features to see what i can enable.

Proposed Solution

add an new flag to make cargo add print all features. or perhaps make it do so when -v/--verbose is specified.

Notes

No response

[epage]

Can you provide an example of a crate with that large of a feature list that you want to browse?

If we don't support this already, the two most ways to support this that are aligned with cargo would be

• show it with -v
• show it with -F (nothing else) except this command takes a positional and we generally don't mix flag/option hybrids with positionals