absvim/lua/autocmds.lua

local autocmd = vim.api.nvim_create_autocmd -- Create autocommand
---- Toggle between line numbers and relative line numbers
local _group = vim.api.nvim_create_augroup("LineNumber", { clear = true })

local function relativeln(target)
	if vim.b.lnstatus == nil then
		vim.b.lnstatus = "number"
	end

	if vim.b.lnstatus ~= "nonumber" then
		if target == "number" then
			vim.o.number = true
			vim.o.relativenumber = false
		else
			vim.o.number = true
			vim.o.relativenumber = true
		end
	else
		vim.o.number = false
	end
end

autocmd("InsertEnter", {
	pattern = "*",
	callback = function()
		relativeln("number")
	end,
	once = false,
	group = _group,
})
autocmd("InsertLeave", {
	pattern = "*",
	callback = function()
		relativeln("relativenumber")
	end,
	once = false,
	group = _group,
})

autocmd("FocusLost", {
	pattern = "*",
	callback = function()
		relativeln("number")
	end,
	once = false,
	group = _group,
})
autocmd("CursorMoved", {
	pattern = "*",
	callback = function()
		relativeln("relativenumber")
	end,
	once = false,
	group = _group,
})

vim.cmd([[
:augroup fmt
:  autocmd!
:  autocmd BufWritePre * silent! undojoin | silent! Neoformat
:augroup END
]])

local nvim_tree_events = require("nvim-tree.events")
local bufferline_api = require("bufferline.api")

local function get_tree_size()
	return require("nvim-tree.view").View.width
end

nvim_tree_events.subscribe("TreeOpen", function()
	bufferline_api.set_offset(get_tree_size())
end)

nvim_tree_events.subscribe("Resize", function()
	bufferline_api.set_offset(get_tree_size())
end)

nvim_tree_events.subscribe("TreeClose", function()
	bufferline_api.set_offset(0)
end)

-- change tmux title
autocmd("BufReadPost", {
	pattern = "*",
	callback = function()
		vim.cmd([[call system("tmux rename-window '" . expand("%:t") . "'")]])
	end,
	once = false,
	group = _group,
})
autocmd("FileReadPost", {
	pattern = "*",
	callback = function()
		vim.cmd([[call system("tmux rename-window '" . expand("%:t") . "'")]])
	end,
	once = false,
	group = _group,
})

autocmd("BufNewFile", {
	pattern = "*",
	callback = function()
		vim.cmd([[call system("tmux rename-window '" . expand("%:t") . "'")]])
	end,
	once = false,
	group = _group,
})
autocmd("BufEnter", {
	pattern = "*",
	callback = function()
		vim.cmd([[call system("tmux rename-window '" . expand("%:t") . "'")]])
	end,
	once = false,
	group = _group,
})

-- auto close nvimtree
autocmd("BufEnter", {
	command = "if winnr('$') == 1 && bufname() == 'NvimTree_' . tabpagenr() | quit | endif",
	nested = true,
})

-- dont show line numbers for nvimtree buffers
autocmd("BufEnter", {
	pattern = { "NvimTree*" },
	callback = function()
		vim.b.lnstatus = "nonumber"
	end,
})

-- Disable the statusline, tabline and cmdline while the alpha dashboard is open
autocmd("User", {
	pattern = "AlphaReady",
	desc = "disable status, tabline and cmdline for alpha",
	callback = function()
		vim.go.laststatus = 1
		vim.opt.showtabline = 1
		vim.opt.cmdheight = 1
	end,
})
autocmd("BufUnload", {
	buffer = 0,
	desc = "enable status, tabline and cmdline after alpha",
	callback = function()
		vim.go.laststatus = 2
		vim.opt.showtabline = 2
		vim.opt.cmdheight = 1
	end,
})