feat(nvim): read diff status from gitsigns

vim/lua/lightline_config.lua

@@ -10,6 +10,14 @@ local mode_map = {
 	["V-LINE"] = "V-LINE",
 }
 
+local function format_diff_element(val, sym)
+	if val == nil or val < 1 then
+		return ""
+	end
+
+	return sym .. val
+end
+
 require("lualine").setup({
 	options = {
 		icons_enabled = false,
@@ -31,7 +39,28 @@ require("lualine").setup({
 				"branch",
 				padding = { left = 0 },
 			},
-			"diff",
+			-- render coloured output from gitsigns, this doesn't seem to work with b:gitsigns_status:
+			{
+				function()
+					return format_diff_element(vim.b.gitsigns_status_dict.added, "+")
+				end,
+				color = { fg = "#a3be8c" },
+				padding = 0,
+			},
+			{
+				function()
+					return format_diff_element(vim.b.gitsigns_status_dict.changed, "~")
+				end,
+				color = { fg = "#ebcb8b" },
+				padding = 0,
+			},
+			{
+				function()
+					return format_diff_element(vim.b.gitsigns_status_dict.removed, "-")
+				end,
+				color = { fg = "#bf616a" },
+				padding = 0,
+			},
 			{
 				"diagnostics",
 				sources = { "nvim_lsp" },