neovide/website/docs/faq.md

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:

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.