# Frequently Asked Questions

Commonly asked questions, or just explanations/elaborations on stuff.

## How Can I Set The Font/Scale The UI Size?

This is handled through the `guifont` option, settable through Neovim. It's technically documented
in `:h guifont` (type this in Neovim), though some things are misleading there, so here we do what's
discouraged and try to document it ourselves:

- The basic format is `IBM_Plex_Mono,Hack,Noto_Color_Emoji:option1:option2`. You can use arbitrarily
  many "font fallbacks" (`Hack` and `Noto_Color_Emoji` "help out" if `IBM_Plex_Mono` doesn't define
  a character), and arbitrarily many options. Though please note that _first_ all fonts are defined,
  _then_ all options, the options apply "globally".
- Use `:set guifont=*` to open up a window showing what fonts are accessible by Neovide, hit `Enter`
  on one to apply it **temporarily**.
- Spaces in the font name are a bit difficult to write, either use underscores (`_`) or escape them
  (`\`).
- The font options Neovide supports at the moment are:
  - `hXX` — Set the font size to `XX`, can be any (even non-two-digit) number or even a floating
    point number.
  - `b` — Sets the font **bold**.
  - `i` — Sets the font _italic_.

By the way, the default font used is Fira Code at size 14.

## How Can I Dynamically Change The Font Size At Runtime?

Not directly in Neovide, but configurable if you want so. A way to accomplish that in Lua would be:

```lua
vim.g.gui_font_default_size = 12
vim.g.gui_font_size = vim.g.gui_font_default_size
vim.g.gui_font_face = "Fira Code Retina"

RefreshGuiFont = function()
  vim.opt.guifont = string.format("%s:h%s",vim.g.gui_font_face, vim.g.gui_font_size)
end

ResizeGuiFont = function(delta)
  vim.g.gui_font_size = vim.g.gui_font_size + delta
  RefreshGuiFont()
end

ResetGuiFont = function()
  vim.g.gui_font_size = vim.g.gui_font_default_size
  RefreshGuiFont()
end

-- Call function on startup to set default value
ResetGuiFont()

-- Keymaps

local opts = { noremap = true, silent = true }

vim.keymap.set({'n', 'i'}, "<C-+>", function() ResizeGuiFont(1)  end, opts)
vim.keymap.set({'n', 'i'}, "<C-->", function() ResizeGuiFont(-1) end, opts)
```

Credits to [0x0013 here](https://github.com/neovide/neovide/issues/1301#issuecomment-1119370546).