如何完成 rustup/cargo 命令？

Question

I have rustup+rust+cargo installed using the official installation script .

How do I enable shell completions, to be able to type cargo <TAB> in the terminal and see the possible commands such as cargo check ?

Answer 1

You can run rustup completions and follow the instructions. For example, for bash you can run

rustup completions bash       >> ~/.local/share/bash-completion/completions/rustup
rustup completions bash cargo >> ~/.local/share/bash-completion/completions/cargo

to generate completions for rustup and cargo respectively. Consult rustup completions for further details, eg for configuring zsh and fish completions.

Answer 2

@AnonymousDuck's answer is a good way to do it in principle. A downside to "expanding" the completions is that one should remember to regenerate the expanded forms after updates, so they're kept up to date with the respective tools.

A way to make that happen on demand (sacrificing a few milliseconds on first invocation) is for example:

printf '. <(rustup completions bash)\n'       >~/.local/share/bash-completion/completions/rustup
printf '. <(rustup completions bash cargo)\n' >~/.local/share/bash-completion/completions/cargo

A slight caveat that is rarely an issue is that the use of <(...) requires the shell to not be in POSIX mode.