nvim: Add conform.nvim formatter

In the process of moving away from null-ls, added formatting with the help
of conform.nvim. Brings one new command, :ConformInfo which can also be
reached via `<leader>vc`.

AutoFormat on saving remains disabled by default but can be enabled with
:FormatEnable (and disabled again with :FormatDisable) or quickly through
`<localleader>lL`.

Manual formatting works like before with `<localleader>ll`. Uses the
formatters set in the plugin (similar setup to null-ls before) but
automatically falls back to lsp formatters if it does not have its own
and lsp has one enabled.

nvim/.config/nvim/lua/plugins/ide.lua

@@ -66,6 +66,85 @@ return {
 			require("plugins.config.lsp")
 		end,
 	},
+
+
+	-- formatting setup
+	{
+		"stevearc/conform.nvim",
+		config = function()
+			require("conform").setup({
+				lsp_fallback = true,
+				format_after_save = function(bufnr)
+					if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
+						return
+					end
+					return { lsp_fallback = true }
+				end,
+				formatters_by_ft = {
+					angular = { { "prettierd", "prettier" } },
+					astro = { { "prettierd", "prettier" } },
+					bash = { "shfmt" },
+					bib = { "bibtex-tidy" },
+					javascript = { { "prettierd", "prettier" } },
+					javascriptreact = { { "prettierd", "prettier" } },
+					json = { "jq" },
+					lua = { "stylua" },
+					python = { "ruff_fix", "ruff_format" },
+					sh = { "shfmt" },
+					typescript = { { "prettierd", "prettier" } },
+					vue = { { "prettierd", "prettier" } },
+					zsh = { "shfmt" },
+				},
+				formatters = {
+					-- enable python isort functionality
+					ruff_fix = {
+						prepend_args = { "--select", "I" },
+					},
+				},
+			})
+			vim.api.nvim_create_user_command("FormatDisable", function(args)
+				if args.bang then
+					-- FormatDisable! will disable formatting just for this buffer
+					vim.b.disable_autoformat = true
+				else
+					vim.g.disable_autoformat = true
+				end
+			end, {
+				desc = "Disable formatting on save",
+				bang = true,
+			})
+			vim.api.nvim_create_user_command("FormatEnable", function()
+				vim.b.disable_autoformat = false
+				vim.g.disable_autoformat = false
+			end, {
+				desc = "Enable formatting on save",
+			})
+		end,
+		cmd = { "ConformInfo" },
+		event = { "BufReadPre" },
+		keys = {
+			{
+				"<localleader>ll",
+				function()
+					require("conform").format({ async = true, lsp_fallback = true })
+				end,
+				desc = "Format buffer",
+			},
+			{
+				"<localleader>lL",
+				function()
+					vim.g.disable_autoformat = not vim.g.disable_autoformat
+				end,
+				desc = "Toggle AutoFormat",
+			},
+			{
+				"<leader>vf",
+				":ConformInfo<cr>",
+				desc = "ConformInfo",
+			},
+		},
+	},
+
 	-- completion setup
 	{
 		"hrsh7th/nvim-cmp",