charm layers for a specific layer

[hyperbolic2346]

Checklist

• Confirmed this is an issue with charm-tools, not charmstore-client
• Provide versions of tools used
• Described the feature or ways to replicate the issue

What version am I running?

I ran the following command: snap info charm and got the following ouput:

name:      charm
summary:   charm and charm-tools
publisher: Cory Johns (johnsca)
contact:   [email protected]
license:   unset
description: |
  charmstore-client and charm-tools
commands:
  - charm
snap-id:      2Rryoc2ylScfbFl4eQtpntHD9iuZuMvt
tracking:     stable
refresh-date: 2019-07-12
channels:
  stable:    2.6.1               2019-07-12 (357) 58MB classic
  candidate: 2.6.1               2019-07-12 (357) 58MB classic
  beta:      2.6.1               2019-07-12 (357) 58MB classic
  edge:      2.7.0+git-3-ef68b75 2019-09-20 (376) 58MB classic
installed:   2.6.1                          (357) 58MB classic

I am using: Ubuntu

Issue/Feature

Unable to see what files a layer contributed without some grep work.

I expect/expected the following

charm layers --limit nagios should show me the files contributed from the nagios layer only. I'm not sure about the --limit name, but in some way to just say "show me what this layer added". This should include not just files dropped but merged files as well. It would be nice to show the merged data, but not necessary if difficult.

What I got

charm layers|grep nagios helped, but I lost some fo the context, so I needed to pipe to less and search for grep to grok the output.