Make home shorthand configurable for dir prompt

[julienfalque]

Replaces ~ at the beginning of the directory for dir prompt, just like /. Not sure about the variable name, please tell me if you have a better idea :)

[dritter]

Ha! Awesome! Thanks for your contribution.
I would have named it POWERLEVEL9K_SHORTEN_HOME_DELIMITER.. What do you think?

[julienfalque]

I don't think it can be considered as a delimiter. What about POWERLEVEL9K_DIR_LEADING_TILDE?

[dritter]

Yes, naming it "delimiter" was my initial reflex, because I wanted it to make similar to the other replacement variable (which is POWERLEVEL9K_SHORTEN_DELIMITER). But you are probably right. Neither my suggestion nor the delimiter name is very good.

So. How about POWERLEVEL9K_HOME_FOLDER_ABBREVIATION?

We should rename the old variable at some point to POWERLEVEL9K_FOLDER_ABBREVIATION.. 🤔

[julienfalque]

POWERLEVEL9K_HOME_FOLDER_ABBREVIATION seems good to me, I updated it.

[onaforeignshore]

Devil's advocate here - what if someone does POWERLEVEL9K_HOME_FOLDER_ABBREVIATION="Home Folder". Then it's hardly an abbreviation. Or if they want to replace the ~ with an icon, what then? Wouldn't POWERLEVEL9K_HOME_FOLDER be better then? (Using the KISS principle)

[dritter]

@onaforeignshore For that name you have to think outside of the box. I see you are coming from replacing ~ with something longer is not an abbreviation any more, but that train of thought is because you have seen the code / know that *nix OSes abbreviate the users home folder with a tilde.

For me that the OS abbreviates /home/user with ~ is the default value of POWERLEVEL9K_HOME_FOLDER_ABBREVIATION. We don't set it with our set_default function, because it is already done. If this was our code that name would make total sense. And from the outside perspective it looks like we are doing this..

POWERLEVEL9K_HOME_FOLDER is not specific enough in my opinion..

[bhilburn]

I think this is a neat idea! Thanks for contributing, @julienfalque!

One item before I merge it: can you update the README to include this new variable?

Regarding the name of the variable:
@dritter's suggestion does a good job of capturing how people will think about it, but @onaforeignshore raises an interesting point about what it actually represents. Interestingly, using ~ to represent $HOME is actually a BASH thing, and can be different from shell-to-shell. ZSH gets it from BASH. The technical name for it is the "BASH Tilde Expansion", in that it expands to $HOME. Here, we are going the opposite direction. I can't think of a name better than ABBREVIATION, though.

[onaforeignshore]

@bhilburn if it is "BASH Tilde Expansion", the opposite would be CONTRACTION not ABBREVIATION, from a purely linguistic POV

[julienfalque]

Updated the README file. About the variable name, I'm out of ideas too :)

[bhilburn]

Thanks so much for the great contribution, @julienfalque! Nice work, and welcome to the project :)