Add short option to dir section like fish shell

[knorr3]

Description

Fixes #897.

I dunno if the placement is right because I was confused by the repo truncate code above :-).
The code was copied by fish shell: https://github.com/ohmyzsh/ohmyzsh/blob/master/themes/fishy.zsh-theme

Screenshot

• Path:
  • /usr/local/opt/spaceship/sections
• Path with standard TRUNC setting:
  • …/opt/spaceship/sections
• Path with this pull request:
  

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[denysdovhan]

Good job! Thanks for contributing!

Let me take a closer look when I will get some spare time.

[merikan]

@knorr3 I have been using your PR for a couple of days and it works great. Awesome, just what I needed 👍

Previously I used liquidprompt which has a nice implementation to show the path through different methods.

[denysdovhan]

I guess this will not work with git/hg repos. I would like to maintain git repo name in full instead of shortened.

[denysdovhan]

Here's my review:

• This is a cool and long-awaited feature. Thanks for contributing it!
• This should be enabled by default, so no SPACESHIP_DIR_SHORT option
• This should respect git/hg-root, so it is not truncated

Please, implement these suggestions.