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config/lua/functions.lua

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+local cmd = vim.cmd
+local fn = vim.fn
+
+local M = {}
+
+-- check if a variable is not empty nor nil
+M.isNotEmpty = function(s)
+	return s ~= nil and s ~= ""
+end
+
+-- toggle quickfixlist
+M.toggle_qf = function()
+	local windows = fn.getwininfo()
+	local qf_exists = false
+	for _, win in pairs(windows) do
+		if win["quickfix"] == 1 then
+			qf_exists = true
+		end
+	end
+	if qf_exists == true then
+		cmd("cclose")
+		return
+	end
+	if M.isNotEmpty(fn.getqflist()) then
+		cmd("copen")
+	end
+end
+
+M.gitui_toggle = function()
+	local Terminal = require("toggleterm.terminal").Terminal
+	local gitui = Terminal:new({ cmd = "gitui", direction = "float", hidden = true })
+	gitui:toggle()
+end
+
+-- move over a closing element in insert mode
+M.escapePair = function()
+	local closers = { ")", "]", "}", ">", "'", '"', "`", "," }
+	local line = vim.api.nvim_get_current_line()
+	local row, col = unpack(vim.api.nvim_win_get_cursor(0))
+	local after = line:sub(col + 1, -1)
+	local closer_col = #after + 1
+	local closer_i = nil
+	for i, closer in ipairs(closers) do
+		local cur_index, _ = after:find(closer)
+		if cur_index and (cur_index < closer_col) then
+			closer_col = cur_index
+			closer_i = i
+		end
+	end
+	if closer_i then
+		vim.api.nvim_win_set_cursor(0, { row, col + closer_col })
+	else
+		vim.api.nvim_win_set_cursor(0, { row, col + 1 })
+	end
+end
+
+diagnostics_active = true -- must be global since this function is called in which.lua
+-- toggle diagnostics line
+M.toggle_diagnostics = function()
+	diagnostics_active = not diagnostics_active
+	if diagnostics_active then
+		vim.diagnostic.show()
+	else
+		vim.diagnostic.hide()
+	end
+end
+
+--@author kikito
+---@see https://codereview.stackexchange.com/questions/268130/get-list-of-buffers-from-current-neovim-instance
+function M.get_listed_buffers()
+	local buffers = {}
+	local len = 0
+	for buffer = 1, vim.fn.bufnr("$") do
+		if vim.fn.buflisted(buffer) == 1 then
+			len = len + 1
+			buffers[len] = buffer
+		end
+	end
+
+	return buffers
+end
+
+function M.bufdelete(bufnum)
+	require("bufdelete").bufdelete(bufnum, true)
+end
+
+-- when there is no buffer left show Alpha dashboard
+vim.api.nvim_create_augroup("alpha_on_empty", { clear = true })
+vim.api.nvim_create_autocmd("User", {
+	pattern = "BDeletePre",
+	group = "alpha_on_empty",
+	callback = function(event)
+		local found_non_empty_buffer = false
+		local buffers = M.get_listed_buffers()
+
+		for _, bufnr in ipairs(buffers) do
+			if not found_non_empty_buffer then
+				local name = vim.api.nvim_buf_get_name(bufnr)
+				local ft = vim.api.nvim_buf_get_option(bufnr, "filetype")
+
+				if bufnr ~= event.buf and name ~= "" and ft ~= "Alpha" then
+					found_non_empty_buffer = true
+				end
+			end
+		end
+
+		if not found_non_empty_buffer then
+			vim.cmd([[:Alpha]])
+		end
+	end,
+})
+
+function M.custom_lsp_attach(client, bufnr)
+	-- disable formatting for LSP clients as this is handled by null-ls
+	client.server_capabilities.document_formatting = false
+	client.server_capabilities.document_range_formatting = false
+	-- enable illuminate to intelligently highlight
+	require("illuminate").on_attach(client)
+	-- enable navic for displaying current code context
+	require("nvim-navic").attach(client, bufnr)
+	-- add lsp-signature TODO: do I need this?
+	-- require("lsp_signature").on_attach(require("config.lsp-signature").cfg)
+	-- add LSP specific key mappings to which key
+	local wk = require("which-key")
+	local default_options = { silent = true }
+	wk.register({
+		l = {
+			name = "LSP",
+			D = { "<cmd>lua vim.lsp.buf.declaration()<cr>", "Go To Declaration" },
+			I = {
+				"<cmd>lua vim.lsp.buf.implementation()<cr>",
+				"Show implementations",
+			},
+			R = { "<cmd>lua vim.lsp.buf.rename()<cr>", "Rename" },
+			a = { "<cmd>lua vim.lsp.buf.code_action()<cr>", "Code Action" },
+			d = { "<cmd>lua vim.lsp.buf.definition()<cr>", "Go To Definition" },
+			e = { "<cmd>Telescope diagnostics bufnr=0<cr>", "Document Diagnostics" },
+			-- f = { "<cmd>lua vim.lsp.buf.formatting()<cr>", "Format" },
+			i = { "<cmd>LspInfo<cr>", "Connected Language Servers" },
+			k = { "<cmd>lua vim.lsp.buf.hover()<cr>", "Hover Commands" },
+			l = { "<cmd>lua vim.diagnostic.open_float()<CR>", "Line diagnostics" },
+			n = { "<cmd>lua vim.diagnostic.goto_next()<cr>", "Next Diagnostic" },
+			p = { "<cmd>lua vim.diagnostic.goto_prev()<cr>", "Prev Diagnostic" },
+			q = { "<cmd>lua vim.diagnostic.setloclist()<cr>", "Quickfix" },
+			r = { "<cmd>lua vim.lsp.buf.references()<cr>", "References" },
+			s = { "<cmd>Telescope lsp_document_symbols<cr>", "Document Symbols" },
+			t = { "<cmd>lua vim.lsp.buf.type_definition()<cr>", "Type Definition" },
+			w = {
+				name = "workspaces",
+				a = {
+					"<cmd>lua vim.lsp.buf.add_workspace_folder()<cr>",
+					"Add Workspace Folder",
+				},
+				d = { "<cmd>Telescope diagnostics<cr>", "Workspace Diagnostics" },
+				l = {
+					"<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<cr>",
+					"List Workspace Folders",
+				},
+				r = {
+					"<cmd>lua vim.lsp.buf.remove_workspace_folder()<cr>",
+					"Remove Workspace Folder",
+				},
+				s = {
+					"<cmd>Telescope lsp_dynamic_workspace_symbols<cr>",
+					"Workspace Symbols",
+				},
+			},
+		},
+	}, { prefix = "<leader>", mode = "n", default_options })
+end
+
+return M