neovim-confs/lua/plex/config/autocmds.lua

-- Rafi's Neovim autocmds
-- github.com/rafi/vim-config
-- ===

-- This file is automatically loaded by rafi.config.init

local function augroup(name)
	return vim.api.nvim_create_augroup('plex_' .. name, {})
end

-- Check if we need to reload the file when it changed
vim.api.nvim_create_autocmd({ 'FocusGained', 'TermClose', 'TermLeave' }, {
	group = augroup('checktime'),
	command = 'checktime',
})

-- Go to last loc when opening a buffer, see ':h last-position-jump'
vim.api.nvim_create_autocmd('BufReadPost', {
	group = augroup('last_loc'),
	callback = function()
		local exclude = { 'gitcommit', 'commit', 'gitrebase' }
		local buf = vim.api.nvim_get_current_buf()
		if vim.tbl_contains(exclude, vim.bo[buf].filetype) then
			return
		end
		local mark = vim.api.nvim_buf_get_mark(buf, '"')
		local lcount = vim.api.nvim_buf_line_count(buf)
		if mark[1] > 0 and mark[1] <= lcount then
			pcall(vim.api.nvim_win_set_cursor, 0, mark)
		end
	end,
})

-- Show cursor line only in active window
vim.api.nvim_create_autocmd({ 'InsertLeave', 'WinEnter' }, {
	group = augroup('auto_cursorline_show'),
	callback = function(event)
		if vim.bo[event.buf].buftype == '' then
			vim.opt_local.cursorline = true
		end
	end,
})
vim.api.nvim_create_autocmd({ 'InsertEnter', 'WinLeave' }, {
	group = augroup('auto_cursorline_hide'),
	callback = function(_)
		vim.opt_local.cursorline = false
	end,
})

-- Highlight on yank
vim.api.nvim_create_autocmd('TextYankPost', {
	group = augroup('highlight_yank'),
	callback = function()
		vim.highlight.on_yank()
	end,
})

-- Automatically set read-only for files being edited elsewhere
-- vim.api.nvim_create_autocmd('SwapExists', {
-- 	group = augroup('open_swap'),
-- 	nested = true,
-- 	callback = function()
-- 		vim.v.swapchoice = 'o'
-- 	end,
-- })

-- Create directories when needed, when saving a file (except for URIs "://").
vim.api.nvim_create_autocmd('BufWritePre', {
	group = augroup('auto_create_dir'),
	callback = function(event)
		if event.match:match('^%w%w+://') then
			return
		end
		local file = vim.loop.fs_realpath(event.match) or event.match
		vim.fn.mkdir(vim.fn.fnamemodify(file, ':p:h'), 'p')
	end,
})

-- Disable conceallevel for specific file-types.
vim.api.nvim_create_autocmd('FileType', {
	group = augroup('fix_conceallevel'),
	pattern = { 'markdown' },
	callback = function()
		vim.opt_local.conceallevel = 0
	end,
})

-- Resize splits if window got resized
vim.api.nvim_create_autocmd('VimResized', {
	group = augroup('resize_splits'),
	callback = function()
		vim.cmd('wincmd =')
	end,
})

-- Wrap and enable spell-checker in text filetypes
vim.api.nvim_create_autocmd('FileType', {
	group = augroup('spell_conceal'),
	pattern = { 'gitcommit', 'markdown', 'tex', 'latex', 'norg' },
	callback = function()
		vim.opt_local.spell = true
		vim.opt_local.conceallevel = 0
	end,
})

-- Close some filetypes with <q>
vim.api.nvim_create_autocmd('FileType', {
	group = augroup('close_with_q'),
	pattern = {
		'blame',
		'checkhealth',
		'fugitive',
		'fugitiveblame',
		'help',
		'httpResult',
		'lspinfo',
		'notify',
		'PlenaryTestPopup',
		'qf',
		'spectre_panel',
		'startuptime',
		'tsplayground',
	},
	callback = function(event)
		vim.bo[event.buf].buflisted = false
		-- stylua: ignore
		vim.keymap.set('n', 'q', '<cmd>close<CR>', { buffer = event.buf, silent = true })
	end,
})

vim.api.nvim_create_autocmd('BufWritePre', {
	group = augroup('undo_disable'),
	pattern = { '/tmp/*', '*.tmp', '*.bak', 'COMMIT_EDITMSG', 'MERGE_MSG' },
	callback = function(event)
		vim.opt_local.undofile = false
		if event.file == 'COMMIT_EDITMSG' or event.file == 'MERGE_MSG' then
			vim.opt_local.swapfile = false
		end
	end,
})

-- Disable swap/undo/backup files in temp directories or shm
vim.api.nvim_create_autocmd({ 'BufNewFile', 'BufReadPre' }, {
	group = augroup('secure'),
	pattern = {
		'/tmp/*',
		'$TMPDIR/*',
		'$TMP/*',
		'$TEMP/*',
		'*/shm/*',
		'/private/var/*',
	},
	callback = function()
		vim.opt_local.undofile = false
		vim.opt_local.swapfile = false
		vim.opt_global.backup = false
		vim.opt_global.writebackup = false
	end,
})