refactor(incline.lua): update incline setup to include window padding and margin

feat(incline.lua): add custom rendering function to display file icons, git diff
indicators, and diagnostic signs in incline plugin

lua/absolute/after/incline.lua

@@ -1,3 +1,59 @@
 local incline = require("incline")
+local helpers = require("incline.helpers")
+local devicons = require("nvim-web-devicons")
 
-incline.setup({})
+incline.setup({
+	window = {
+		padding = 0,
+		margin = { horizontal = 0 },
+	},
+	render = function(props)
+		local filename = vim.fn.fnamemodify(vim.api.nvim_buf_get_name(props.buf), ":t")
+		local ft_icon, ft_color = devicons.get_icon_color(filename)
+		local modified = vim.bo[props.buf].modified
+
+		local function get_git_diff()
+			local icons = { removed = "", changed = "", added = "" }
+			local signs = vim.b[props.buf].gitsigns_status_dict
+			local labels = {}
+			if signs == nil then
+				return labels
+			end
+			for name, icon in pairs(icons) do
+				if tonumber(signs[name]) and signs[name] > 0 then
+					table.insert(labels, { icon .. signs[name] .. " ", group = "Diff" .. name })
+				end
+			end
+			if #labels > 0 then
+				table.insert(labels, { "┊ " })
+			end
+			return labels
+		end
+
+		local function get_diagnostic_label()
+			local icons = { error = "", warn = "", info = "", hint = "" }
+			local label = {}
+
+			for severity, icon in pairs(icons) do
+				local n = #vim.diagnostic.get(props.buf, { severity = vim.diagnostic.severity[string.upper(severity)] })
+				if n > 0 then
+					table.insert(label, { icon .. n .. " ", group = "DiagnosticSign" .. severity })
+				end
+			end
+			if #label > 0 then
+				table.insert(label, { "┊ " })
+			end
+			return label
+		end
+
+		return {
+			{ get_diagnostic_label() },
+			{ get_git_diff() },
+			ft_icon and { " ", ft_icon, " ", guibg = ft_color, guifg = helpers.contrast_color(ft_color) } or "",
+			" ",
+			{ filename, gui = modified and "bold,italic" or "bold" },
+			" ",
+			guibg = "#44406e",
+		}
+	end,
+})