nvim: Replace null-ls with nvim-lint

Fully replaced null-ls. Will need more tweaking on the nvim-lint setup but
works generally for now. Works well in tandem with conform formatter.

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

@@ -55,14 +55,6 @@ return {
 				"williamboman/mason-lspconfig.nvim",
 				cmd = { "LspInstall", "LspUninstall" },
 			},
-			{
-				"jose-elias-alvarez/null-ls.nvim",
-				dependencies = {
-					"nvim-lua/plenary.nvim",
-					"jay-babu/mason-null-ls.nvim",
-				},
-				event = "VeryLazy",
-			},
 		},
 		event = "BufReadPost",
 		config = function()
@@ -75,6 +67,50 @@ return {
 		} },
 	},
 
+	-- linting setup
+	{
+		"mfussenegger/nvim-lint",
+		config = function()
+			local linters = {
+				astro = {},
+				bash = {},
+				javascript = {},
+				javascriptreact = {},
+				markdown = {},
+				quarto = {},
+				sh = {},
+				svelte = {},
+				text = {},
+				typescript = {},
+				typescriptreact = {},
+			}
+			local per_cmd = function(cmd, ft_table)
+				if vim.fn.executable(cmd) == 1 then
+					for _, v in pairs(ft_table) do
+						table.insert(v, cmd)
+					end
+				end
+			end
+			per_cmd("markdownlint", { linters.markdown })
+			per_cmd("vale", { linters.markdown, linters.text, linters.quarto })
+			per_cmd("shellcheck", { linters.sh, linters.bash })
+			per_cmd("eslint_d", {
+				linters.astro,
+				linters.javascript,
+				linters.javascriptreact,
+				linters.svelte,
+				linters.typescript,
+				linters.typescriptreact,
+			})
+			require("lint").linters_by_ft = linters
+			vim.api.nvim_create_autocmd({ "BufWritePost", "InsertLeave" }, {
+				callback = function()
+					require("lint").try_lint()
+				end,
+			})
+		end,
+		event = { "BufReadPost", "BufNewFile" },
+	},
 
 	-- formatting setup
 	{