nvim: Extract statusline plugin into separate file

Extract lualine into its own 'statusline.lua' plugin file. This makes
the ui plugin file a little more lean but also prepares the way of
tinkering with statusline alternatives, like heirline.

nvim/.config/nvim/lua/plugins/statusline.lua

@@ -0,0 +1,90 @@
+return {
+	-- statusline
+	{
+		"nvim-lualine/lualine.nvim",
+		cond = true,
+		dependencies = { { "nvim-tree/nvim-web-devicons", config = true } },
+		config = function()
+			local has_pynvim = -1
+			-- if molten exists, is initialized and connected to a kernel
+			-- show it in the statusline
+			local function molten()
+				-- we don't have access to python, disregard element
+				if has_pynvim == 0 then
+					return ""
+				elseif has_pynvim == 1 then
+					local status_ok, res = pcall(function()
+						return require("molten.status").kernels() ~= ""
+					end)
+					if status_ok and res then
+						return "󱪄"
+					end
+					return ""
+				-- we don't know if we have python yet, start a check
+				else
+					vim.system({ "poetry", "env", "info", "-p" }, { text = true }, function(obj)
+						if obj.code == 0 then
+							has_pynvim = 1
+						else
+							has_pynvim = 0
+						end
+					end)
+					has_pynvim = 0
+				end
+			end
+
+			-- count number of selected lines and characters
+			-- stolen: https://github.com/chrisgrieser/.config/blob/8af1841ba24f7c81c513e12f853b52f530ef5b37/nvim/lua/plugins/lualine.lua#L80C1-L87C4
+			local function selectionCount()
+				local isVisualMode = vim.fn.mode():find("[Vv]")
+				if not isVisualMode then
+					return ""
+				end
+				local starts = vim.fn.line("v")
+				local ends = vim.fn.line(".")
+				local lines = starts <= ends and ends - starts + 1 or starts - ends + 1
+				return " " .. tostring(lines) .. "L " .. tostring(vim.fn.wordcount().visual_chars) .. "C"
+			end
+			require("lualine").setup({
+				options = {
+					icons_enabled = true,
+					theme = "auto",
+					component_separators = { left = "", right = "" },
+					section_separators = { left = "", right = "" },
+					disabled_filetypes = {},
+					always_divide_middle = true,
+				},
+				sections = {
+					lualine_a = { "mode" },
+					lualine_b = { "branch", "diff", "diagnostics" },
+					lualine_c = { "filename" },
+					lualine_x = { "encoding", "fileformat", "filetype", molten },
+					lualine_y = { "progress" },
+					lualine_z = { selectionCount, "location" },
+				},
+				inactive_sections = {
+					lualine_a = {},
+					lualine_b = { "branch", "diff" },
+					lualine_c = { "filename" },
+					lualine_x = {},
+					lualine_y = { "location" },
+					lualine_z = {},
+				},
+				tabline = {},
+				extensions = {
+					"aerial",
+					"lazy",
+					"man",
+					"mason",
+					"nvim-dap-ui",
+					"nvim-tree",
+					"oil",
+					"quickfix",
+					"toggleterm",
+					"trouble",
+				},
+			})
+		end,
+		event = { "VeryLazy" },
+	},
+}

nvim/.config/nvim/lua/plugins/ui.lua

@@ -1,91 +1,4 @@
 return {
-	-- statusline
-	{
-		"nvim-lualine/lualine.nvim",
-		dependencies = { { "nvim-tree/nvim-web-devicons", config = true } },
-		config = function()
-			local has_pynvim = -1
-			-- if molten exists, is initialized and connected to a kernel
-			-- show it in the statusline
-			local function molten()
-				-- we don't have access to python, disregard element
-				if has_pynvim == 0 then
-					return ""
-				elseif has_pynvim == 1 then
-					local status_ok, res = pcall(function()
-						return require("molten.status").kernels() ~= ""
-					end)
-					if status_ok and res then
-						return "󱪄"
-					end
-					return ""
-				-- we don't know if we have python yet, start a check
-				else
-					vim.system({ "poetry", "env", "info", "-p" }, { text = true }, function(obj)
-						if obj.code == 0 then
-							has_pynvim = 1
-						else
-							has_pynvim = 0
-						end
-					end)
-					has_pynvim = 0
-				end
-			end
-
-			-- count number of selected lines and characters
-			-- stolen: https://github.com/chrisgrieser/.config/blob/8af1841ba24f7c81c513e12f853b52f530ef5b37/nvim/lua/plugins/lualine.lua#L80C1-L87C4
-			local function selectionCount()
-				local isVisualMode = vim.fn.mode():find("[Vv]")
-				if not isVisualMode then
-					return ""
-				end
-				local starts = vim.fn.line("v")
-				local ends = vim.fn.line(".")
-				local lines = starts <= ends and ends - starts + 1 or starts - ends + 1
-				return " " .. tostring(lines) .. "L " .. tostring(vim.fn.wordcount().visual_chars) .. "C"
-			end
-			require("lualine").setup({
-				options = {
-					icons_enabled = true,
-					theme = "auto",
-					component_separators = { left = "", right = "" },
-					section_separators = { left = "", right = "" },
-					disabled_filetypes = {},
-					always_divide_middle = true,
-				},
-				sections = {
-					lualine_a = { "mode" },
-					lualine_b = { "branch", "diff", "diagnostics" },
-					lualine_c = { "filename" },
-					lualine_x = { "encoding", "fileformat", "filetype", molten },
-					lualine_y = { "progress" },
-					lualine_z = { selectionCount, "location" },
-				},
-				inactive_sections = {
-					lualine_a = {},
-					lualine_b = { "branch", "diff" },
-					lualine_c = { "filename" },
-					lualine_x = {},
-					lualine_y = { "location" },
-					lualine_z = {},
-				},
-				tabline = {},
-				extensions = {
-					"aerial",
-					"lazy",
-					"man",
-					"mason",
-					"nvim-dap-ui",
-					"nvim-tree",
-					"oil",
-					"quickfix",
-					"toggleterm",
-					"trouble",
-				},
-			})
-		end,
-		event = { "VeryLazy" },
-	},
 	-- create pretty unobtrusive notifications
 	{
 		"j-hui/fidget.nvim",