caddycmd: Add --skip-standard to list-modules command, quieter output

[francislavoie]

Tiny little improvement.

The list-modules command is useful to get some quick details at a glance of what's in a Caddy build. In cases where you only really care to know the main version of Caddy plus which plugins were successfully pulled in, I think it's useful to hide the standard modules from the output, since there's currently 83 of them, lots of lines in the output that can be quieted when we know they'll always be listed.

Example output:

$ caddy list-modules --skip-standard --versions --packages

dns.providers.duckdns v0.3.1 github.com/caddy-dns/duckdns

  Non-standard modules: 1

  Unknown modules: 0

[mholt]

I can appreciate this, but I also question its utility. Will people really go to the extra work of typing --skip-standard when they can just as well scan for the count, which already appears toward the end of the output (near where their next prompt is, so they don't have to scroll)? I feel like looking for the count in the current output is easier than typing --skip-standard.

[francislavoie]

In case you didn't notice, I also used it for the output of the caddy upgrade family, which makes those less noisy as well.

This isn't meant for users directly typing out the command, it's more for automated scripts to be less noisy by avoiding redundant information from being printed.

[mholt]

Oh, I see. Hmm. I guess that's okay. Simple, nonintrusive change, so might as well. Thanks!