Update first line on "Alt + ←" and "Alt + →"

[andreiborisov]

related: #68

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Fish allows user to go back and forth in directory history with Alt + ← and Alt + →. Pure should update first line of the prompt containing current directory after changing it using those key combinations.

Right now, the directory on the first line updates to proper value only on the next prompt. Built-in prompts seem to update directory without any issues.

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[rafaelrinaldi]

@schrodincat Thanks for your suggestion. I had no idea this was possible. We will look into supporting this feature on pure.

In the meantime feel free to submit a PR if you feel like it.

[andreiborisov]

@rafaelrinaldi I’ll do a PR, no problems👌 I’ve managed to fix this issue, but I’ve also noticed there is something fishy going on (couldn’t help myself, sorry, I’m new to fish 😅).
Is there any reason we evoking pre_prompt through event handler? Because, it seems, it isn’t called when going through directory history. It is also not called on the terminal opening (at least for me with Terminal.app on macOS) which I believe is not intended behavior.

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[edouard-lopez]

Could you create a dedicated PR for this? Having a smaller scope help review faster and release more frequently 👍

[andreiborisov]

@edouard-lopez no, I don’t think so, the underlying issue is the same as for #68, so if you fix one, you fix other automatically...

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