allow directroy-only + depth, fix #747

[nim65s]

Hi again,

This fix #747.

---

TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry
• Update default config/theme in README (if applicable)
• Update man page at lsd/doc/lsd.md (if applicable)

[pedropombeiro]

Can we have this merged? It would be great to have this behavior, as it would greatly improve performance when using lsd as a previewer in vifm.

[muniu-bot]

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[zwpaper]

hi all, sorry for the late reply, let's get this merged after CI passwd

[pedropombeiro]

hi all, sorry for the late reply, let's get this merged after CI passwd

@zwpaper looks like a couple of Windows jobs failed.

[pedropombeiro]

@zwpaper is this blocked? It would be great to have this merged and released.