nvim/lua/config/bufferline.lua

--- Ensure plugin is avaiable
local ok, bufferline = pcall(require, "bufferline")
if not ok then
	return
end

--- Plugin options
local frappe = require("catppuccin.palettes").get_palette("frappe")
local opts = {
	options = {
		-- mode = "tabs",
		separator_style = "slant",
	},
	highlights = require("catppuccin.groups.integrations.bufferline").get({
		styles = { "italic", "bold" },
		custom = {
			all = {
				fill = { -- bg before buffer
					fg = frappe.text,
					bg = frappe.crust,
				},
				background = { -- buffer bg
					fg = frappe.text,
					bg = frappe.base,
				},
				tab = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				tab_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
				},
				tab_separator = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				tab_separator_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					sp = "#ff0000",
					underline = true,
				},
				tab_close = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				close_button = {
					fg = frappe.text,
					bg = frappe.base,
				},
				close_button_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				close_button_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
				},
				buffer_visible = { -- buffer displayed when in another tab
					fg = frappe.text,
					bg = frappe.surface0,
				},
				buffer_selected = { -- bufferline displayed when in tab
					fg = frappe.text,
					bg = frappe.overlay0,
				},
				numbers = {
					fg = frappe.text,
					bg = frappe.base,
				},
				numbers_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				numbers_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					bold = true,
					italic = true,
				},
				diagnostic = {
					fg = frappe.text,
					bg = frappe.base,
				},
				diagnostic_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				diagnostic_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					bold = true,
					italic = true,
				},
				hint = {
					fg = frappe.text,
					bg = frappe.base,
				},
				hint_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				hint_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					bold = true,
					italic = true,
				},
				hint_diagnostic = {
					fg = frappe.text,
					bg = frappe.base,
				},
				hint_diagnostic_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				hint_diagnostic_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					sp = frappe.red,
					bold = true,
					italic = true,
				},
				info = {
					fg = frappe.text,
					bg = frappe.base,
				},
				info_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				info_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					sp = frappe.red,
					bold = true,
					italic = true,
				},
				info_diagnostic = {
					fg = frappe.text,
					bg = frappe.base,
				},
				info_diagnostic_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
				},
				info_diagnostic_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					sp = frappe.red,
					bold = true,
					italic = true,
				},
				modified = {
					fg = frappe.green,
					bg = frappe.base,
				},
				modified_visible = {
					fg = frappe.green,
					bg = frappe.surface0,
				},
				modified_selected = {
					fg = frappe.green,
					bg = frappe.overlay0,
				},
				duplicate_selected = {
					fg = frappe.text,
					bg = frappe.overlay0,
					italic = true,
				},
				duplicate_visible = {
					fg = frappe.text,
					bg = frappe.surface0,
					italic = true,
				},
				duplicate = {
					fg = frappe.text,
					bg = frappe.base,
					italic = true,
				},
				separator = {
					fg = frappe.crust,
					bg = frappe.base,
				},
				separator_visible = {
					fg = frappe.crust,
					bg = frappe.surface0,
				},
				separator_selected = {
					fg = frappe.crust,
					bg = frappe.overlay0,
				},
				indicator_visible = {
					fg = frappe.crust,
					bg = frappe.surface0,
				},
				indicator_selected = {
					fg = frappe.crust,
					bg = frappe.overlay0,
				},
				pick_selected = {
					fg = frappe.crust,
					bg = frappe.overlay0,
					bold = true,
					italic = true,
				},
				pick_visible = {
					fg = frappe.crust,
					bg = frappe.surface0,
					bold = true,
					italic = true,
				},
				pick = {
					fg = frappe.crust,
					bg = frappe.base,
					bold = true,
					italic = true,
				},
			},
		},
	}),
}

--- Load plugin
bufferline.setup(opts)

--- Override keymaps
local km = vim.keymap.set
km("n", "<Tab>", ":BufferLineCycleNext<cr>")
km("n", "<S-Tab>", ":BufferLineCyclePrev<cr>")
km("n", "<leader>bn", ":BufferLineMoveNext<cr>")
km("n", "<leader>bp", ":BufferLineMovePrev<cr>")
km("n", "<leader>bc", ":BufferLinePickClose<cr>")