Custom filetype and icon for htmldjango in oil file explorer - for Astronvim / neovim / nvim

oil.lua

return {
	{
		"stevearc/oil.nvim",
		dependencies = "nvim-tree/nvim-web-devicons",
		config = function()
			require("oil").setup({
				default_file_explorer = true,
			})
			local function setup_djhtml_icon()
				local has_devicons, devicons = pcall(require, "nvim-web-devicons")
				if has_devicons then
					local html_icon, html_color = devicons.get_icon(".html", "html", { default = true })
					devicons.set_icon({
						djhtml = {
							icon = html_icon,
							color = "#e34c26",
							name = "HTMLDjango",
						},
					})
				end
			end
			setup_djhtml_icon()
		end,
		-- Keymap is defined in astrocore
	},
}

polish.lua

vim.api.nvim_create_autocmd({ "BufNewFile", "BufRead" }, {
        group = vim.api.nvim_create_augroup("filetype_django", { clear = true }),
        desc = "Change filetype to htmldjango",
        callback = function()
                if vim.fn.expand("%:e") == "djhtml" then
                        vim.bo.filetype = "htmldjango"
                end
        end,
})

vim.filetype.add({
        extension = {
                djhtml = "htmldjango",
        },
})