cargo run --{example,bin,bench,test} tab completion

[pbrw]

Problem
If you want to run an example, you have to write it's full name in cargo run --example <example_name>. Name may be long and time is precious.

Solution
It would be great to have a tab completion implemented. We already have a list of possible targets displayed (#6505).

Notes
This was already mentioned here

[ehuss]

It should already work, at least with bash. The source is here. Which shell are you using?

The existing implementation is a bit of a hack, so perhaps it doesn't work in some situations. Quickly retrieving the target names is not currently possible. The long-term solution is intended to be #6645 where the cargo binary itself would drive the completions, where it has easy access to all the information.

[pbrw]

I use GNOME Terminal 3.36.2 and it clearly doesn't work

[ehuss]

GNOME Terminal is a GUI terminal program which is the interface to the underlying shell. The shell is something like bash, zsh, or fish. Each shell has different shell completion, so it is important to know which one you are using, and to check that the completions are integrated properly. The exact method of integration will depend on the shell, OS, and how your startup scripts are setup. Do any of the completions work? If not, then maybe check that the completion is linked in properly for your environment. If completions are working, but just not the --example flag, can you provide a sample project that demonstrates where it doesn't work?

[pickfire]

Yeah, I am wondering why cargo does not auto complete --example for fish shell.

[pickfire]

Ah, looks like it was in fish but there was a bug probably, or maybe it was new. fish-shell/fish-shell#7566