Vertically Center Content

[LandonSchropp]

Hello 👋

I'd love to be able to vertically center my Alpha dashboard.

I followed the advice here and implemented dynamic padding in my Alpha opts:

-- The content_height calculation is based on my custom Alpha config
local content_height = #opts.section.header.val + (#opts.section.buttons.val * 2 - 1) + 3
opts.opts.layout[1].val = vim.fn.floor((vim.fn.winheight(0) - content_height + 2) / 2)

The problem is this function is only run once when Neovim starts up. I often switch between my laptop and desktop, which means that Alpha is always going to be off on one of them.

I think there are a couple of solutions to this issue:

1. Allow the padding to be calculated dynamically. Rather than providing a value to opts.opts.layout[1].val, you could allow a function that returns the value to be passed. Then, Alpha could call this function on every render, which would achieve dynamic padding.

   opts.opts.layout[1].val = function()
     local content_height = #opts.section.header.val + (#opts.section.buttons.val * 2 - 1) + 3
     return vim.fn.floor((vim.fn.winheight(0) - content_height + 2) / 2)
   end

2. Provide a setting for vertically centering content. To me, this would be better DX, and would avoid requiring the settings to understand and calculate the dashboard height.

Thank you!