Add set/edit/delete to cargo config

[heisen-li]

Describe the problem you are trying to solve

According to the previous design document, it seems that the delete, set and edit subcommands are currently missing.
I want to try to complete these sub-commands. Please tell me what else needs to be solved?
#9301
#9302 (comment)

I want to complete the following three commands step by step.

• Add cargo config delete
• Add cargo config set
• Add cargo config edit

If I want to further improve cargo config, what else can I help? I would be happy to participate in the cargo project.

[ehuss]

Cargo currently doesn't have TOML-editing support. @epage has been working on toml-edit, so maybe they can let you know if there is anything you can help with working on that.

[epage]

toml-rs/toml#133 is the tracking issue for getting feature parity for cargo.

We might also need

• toml_edit doesn't properly handle quotes in strings toml-rs/toml#128
• easy::to_string_pretty doesn't produce pretty results toml-rs/toml#192
• Allow inserting serde types as values toml-rs/toml#205