Emit warning if trying to add a file ignored via .chezmoiignore

[Blacksmoke16]

I tried to chezmoi add a file today but couldn't get it to work. Command would exit successfully, but just wouldn't add the file. After a while I figured out the file I wanted to add was actually in a directory thats ignored via .chezmoiignore that I forgot about.

Might be a nice QoL change to emit a warning or something in this case to make it easier to know what the problem is.

[Lockszmith-GH]

did you try --debug?

[Blacksmoke16]

Yes, but nothing really jumped out at me as being obvious. Given there was like 40 lines of output and a few seemingly unrelated errors. Something like this would be a lot better:

$ chezmoi add path/to/thing.txt
chezmoi: Not adding 'path/to/thing.txt' since it is ignored via '.chezmoiignore'

[Lockszmith-GH]

It wasn't a criticism, I was asking if --debug already caught it.

I'm guessing the reason it's suppressed by default is to prevent cli-globing from generating errors.

In Linux/Unix when you do a chezmoi add * - the * is translated by the shell, not by chezmoi.
So that would be noisy.

[twpayne]

I agree that this is a nice QoL improvement. #2762 implements it.